Lincoln Electric IM536-D Operator's Manual

SP-125 PLUS

For use with machine Code Numbers 10260, 10481,10685,10689,10690,10740

IM536-D

March, 2001

Safety Depends on You

Lincoln arc welding and cutting equipment is designed and built with safety in mind. However, your overall safety can be increased by proper installation ... and thoughtful operation on your part.

DO

NOT INSTALL, OPERATE OR

REPAIR THIS EQUIPMENT

WITHOUT READING THIS

MANUAL AND THE SAFETY

PRECAUTIONS CONTAINED

THROUGHOUT.

And, most importantly, think before you act and be careful.

Date of Purchase:

Serial Number:

Code Number:

Model:

Where Purchased:

OPERATOR’S MANUAL

ISO 9001

ANSI RAB

QMS

Designed and Manufactured Under a

Quality Program Certified by

ABS Quality Evaluations, Inc.

to ISO 9001 Requirements.

CERTIFICATE NUMBER: 30273

Copyright © 2001 Lincoln Global Inc.

• World's Leader in Welding and Cutting Products •

• Sales and Service through Subsidiaries and Distributors Worldwide •

Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com

Downloaded from www.Manualslib.com

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i SAFETY

WARNING

CALIFORNIA PROPOSITION 65 WARNINGS

Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other reproductive harm.

The Above For Diesel Engines

The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

The Above For Gasoline Engines

ARC WELDING CAN BE HAZARDOUS. PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH.

KEEP CHILDREN AWAY. PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING.

Read and understand the following safety highlights. For additional safety information, it is strongly recommended that you purchase a copy of “Safety in Welding & Cutting - ANSI Standard Z49.1” from the American Welding Society, P.O. Box

351040, Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available from the Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199.

BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE

PERFORMED ONLY BY QUALIFIED INDIVIDUALS.

FOR ENGINE powered equipment.

1.a. Turn the engine off before troubleshooting and maintenance work unless the maintenance work requires it to be running.

____________________________________________________

1.b. Operate engines in open, well-ventilated areas or vent the engine exhaust fumes outdoors.

1.h. To avoid scalding, do not remove the radiator pressure cap when the engine is hot.

ELECTRIC AND

MAGNETIC FIELDS may be dangerous

____________________________________________________

1.c. Do not add the fuel near an open flame welding arc or when the engine is running.

Stop the engine and allow it to cool before refueling to prevent spilled fuel from vaporizing on contact with hot engine parts and igniting. Do not spill fuel when filling tank. If fuel is spilled, wipe it up and do not start engine until fumes have been eliminated.

____________________________________________________

1.d. Keep all equipment safety guards, covers and devices in position and in good repair.Keep hands, hair, clothing and tools away from V-belts, gears, fans and all other moving parts when starting, operating or repairing equipment.

____________________________________________________

1.e. In some cases it may be necessary to remove safety guards to perform required maintenance. Remove guards only when necessary and replace them when the maintenance requiring their removal is complete.

Always use the greatest care when working near moving parts.

___________________________________________________

1.f. Do not put your hands near the engine fan.

Do not attempt to override the governor or idler by pushing on the throttle control rods while the engine is running.

2.a. Electric current flowing through any conductor causes localized Electric and Magnetic Fields (EMF). Welding current creates EMF fields around welding cables and welding machines

2.b. EMF fields may interfere with some pacemakers, and welders having a pacemaker should consult their physician before welding.

2.c. Exposure to EMF fields in welding may have other health effects which are now not known.

2.d. All welders should use the following procedures in order to minimize exposure to EMF fields from the welding circuit:

2.d.1. Route the electrode and work cables together - Secure them with tape when possible.

2.d.2. Never coil the electrode lead around your body.

2.d.3. Do not place your body between the electrode and work cables. If the electrode cable is on your right side, the work cable should also be on your right side.

___________________________________________________

1.g. To prevent accidentally starting gasoline engines while turning the engine or welding generator during maintenance work, disconnect the spark plug wires, distributor cap or magneto wire as appropriate.

2.d.4. Connect the work cable to the workpiece as close as possible to the area being welded.

2.d.5. Do not work next to welding power source.

Mar ‘95 i

SP-125 PLUS



ii

ELECTRIC SHOCK can kill.

3.a. The electrode and work (or ground) circuits are electrically “hot” when the welder is on.

Do not touch these “hot” parts with your bare skin or wet clothing. Wear dry, hole-free gloves to insulate hands.

3.b. Insulate yourself from work and ground using dry insulation.

Make certain the insulation is large enough to cover your full area of physical contact with work and ground.

In addition to the normal safety precautions, if welding must be performed under electrically hazardous conditions (in damp locations or while wearing wet clothing; on metal structures such as floors, gratings or scaffolds; when in cramped positions such as sitting, kneeling or lying, if there is a high risk of unavoidable or accidental contact with the workpiece or ground) use the following equipment:

• Semiautomatic DC Constant Voltage (Wire) Welder.

• DC Manual (Stick) Welder.

• AC Welder with Reduced Voltage Control.

3.c. In semiautomatic or automatic wire welding, the electrode, electrode reel, welding head, nozzle or semiautomatic welding gun are also electrically “hot”.

3.d. Always be sure the work cable makes a good electrical connection with the metal being welded. The connection should be as close as possible to the area being welded.

3.e. Ground the work or metal to be welded to a good electrical

(earth) ground.

3.f. Maintain the electrode holder, work clamp, welding cable and welding machine in good, safe operating condition. Replace damaged insulation.

3.g. Never dip the electrode in water for cooling.

3.h. Never simultaneously touch electrically “hot” parts of electrode holders connected to two welders because voltage between the two can be the total of the open circuit voltage of both welders.

3.i. When working above floor level, use a safety belt to protect yourself from a fall should you get a shock.

3.j. Also see Items 6.c. and 8.

SAFETY

ARC RAYS can burn.

4.a. Use a shield with the proper filter and cover plates to protect your eyes from sparks and the rays of the arc when welding or observing open arc welding. Headshield and filter lens should conform to ANSI Z87. I standards.

4.b. Use suitable clothing made from durable flame-resistant material to protect your skin and that of your helpers from the arc rays.

4.c. Protect other nearby personnel with suitable, non-flammable screening and/or warn them not to watch the arc nor expose themselves to the arc rays or to hot spatter or metal.

FUMES AND GASES can be dangerous.

5.a. Welding may produce fumes and gases hazardous to health. Avoid breathing these fumes and gases.When welding, keep your head out of the fume. Use enough ventilation and/or exhaust at the arc to keep fumes and gases away from the breathing zone. When welding with electrodes which require special ventilation such as stainless or hard facing (see instructions on container or MSDS) or on lead or cadmium plated steel and other metals or coatings which produce highly toxic fumes, keep exposure as low as possible and below Threshold Limit Values (TLV) using local exhaust or mechanical ventilation. In confined spaces or in some circumstances, outdoors, a respirator may be required. Additional precautions are also required when welding on galvanized steel.

5.b. Do not weld in locations near chlorinated hydrocarbon vapors coming from degreasing, cleaning or spraying operations.

The heat and rays of the arc can react with solvent vapors to form phosgene, a highly toxic gas, and other irritating products.

5.c. Shielding gases used for arc welding can displace air and cause injury or death. Always use enough ventilation, especially in confined areas, to insure breathing air is safe.

5.d. Read and understand the manufacturer’s instructions for this equipment and the consumables to be used, including the material safety data sheet (MSDS) and follow your employer’s safety practices. MSDS forms are available from your welding distributor or from the manufacturer.

5.e. Also see item 1.b.

Mar ‘95 ii

SP-125 PLUS



iii

WELDING SPARKS can cause fire or explosion.

6.a. Remove fire hazards from the welding area.

If this is not possible, cover them to prevent the welding sparks from starting a fire.

Remember that welding sparks and hot materials from welding can easily go through small cracks and openings to adjacent areas. Avoid welding near hydraulic lines. Have a fire extinguisher readily available.

6.b. Where compressed gases are to be used at the job site, special precautions should be used to prevent hazardous situations. Refer to “Safety in Welding and Cutting” (ANSI

Standard Z49.1) and the operating information for the equipment being used.

6.c. When not welding, make certain no part of the electrode circuit is touching the work or ground. Accidental contact can cause overheating and create a fire hazard.

6.d. Do not heat, cut or weld tanks, drums or containers until the proper steps have been taken to insure that such procedures will not cause flammable or toxic vapors from substances inside. They can cause an explosion even though they have been “cleaned”. For information, purchase “Recommended

Safe Practices for the Preparation for Welding and Cutting of

Containers and Piping That Have Held Hazardous

Substances”, AWS F4.1 from the American Welding Society

(see address above).

6.e. Vent hollow castings or containers before heating, cutting or welding. They may explode.

6.f. Sparks and spatter are thrown from the welding arc. Wear oil free protective garments such as leather gloves, heavy shirt, cuffless trousers, high shoes and a cap over your hair. Wear ear plugs when welding out of position or in confined places.

Always wear safety glasses with side shields when in a welding area.

6.g. Connect the work cable to the work as close to the welding area as practical. Work cables connected to the building framework or other locations away from the welding area increase the possibility of the welding current passing through lifting chains, crane cables or other alternate circuits. This can create fire hazards or overheat lifting chains or cables until they fail.

6.h. Also see item 1.c.

SAFETY

CYLINDER may explode if damaged.

7.a. Use only compressed gas cylinders containing the correct shielding gas for the process used and properly operating regulators designed for the gas and pressure used. All hoses, fittings, etc. should be suitable for the application and maintained in good condition.

7.b. Always keep cylinders in an upright position securely chained to an undercarriage or fixed support.

7.c. Cylinders should be located:

• Away from areas where they may be struck or subjected to physical damage.

• A safe distance from arc welding or cutting operations and any other source of heat, sparks, or flame.

7.d. Never allow the electrode, electrode holder or any other electrically “hot” parts to touch a cylinder.

7.e. Keep your head and face away from the cylinder valve outlet when opening the cylinder valve.

7.f. Valve protection caps should always be in place and hand tight except when the cylinder is in use or connected for use.

7.g. Read and follow the instructions on compressed gas cylinders, associated equipment, and CGA publication P-l,

“Precautions for Safe Handling of Compressed Gases in

Cylinders,” available from the Compressed Gas Association

1235 Jefferson Davis Highway, Arlington, VA 22202.

FOR ELECTRICALLY powered equipment.

8.a. Turn off input power using the disconnect switch at the fuse box before working on the equipment.

8.b. Install equipment in accordance with the U.S. National

Electrical Code, all local codes and the manufacturer’s recommendations.

8.c. Ground the equipment in accordance with the U.S. National

Electrical Code and the manufacturer’s recommendations.

iii

Mar ‘95

SP-125 PLUS



iv

PRÉCAUTIONS DE SÛRETÉ

Pour votre propre protection lire et observer toutes les instructions et les précautions de sûreté specifiques qui parraissent dans ce manuel aussi bien que les précautions de sûreté générales suivantes:

Sûreté Pour Soudage A L’Arc

1. Protegez-vous contre la secousse électrique: a. Les circuits à l’électrode et à la piéce sont sous tension quand la machine à souder est en marche. Eviter toujours tout contact entre les parties sous tension et la peau nue ou les vétements mouillés. Porter des gants secs et sans trous pour isoler les mains.

b. Faire trés attention de bien s’isoler de la masse quand on soude dans des endroits humides, ou sur un plancher metallique ou des grilles metalliques, principalement dans les positions assis ou couché pour lesquelles une grande partie du corps peut être en contact avec la masse.

c. Maintenir le porte-électrode, la pince de masse, le câble de soudage et la machine à souder en bon et sûr état defonctionnement.

d.Ne jamais plonger le porte-électrode dans l’eau pour le refroidir.

e. Ne jamais toucher simultanément les parties sous tension des porte-électrodes connectés à deux machines à souder parce que la tension entre les deux pinces peut être le total de la tension à vide des deux machines.

f. Si on utilise la machine à souder comme une source de courant pour soudage semi-automatique, ces precautions pour le porte-électrode s’applicuent aussi au pistolet de soudage.

2. Dans le cas de travail au dessus du niveau du sol, se protéger contre les chutes dans le cas ou on recoit un choc. Ne jamais enrouler le câble-électrode autour de n’importe quelle partie du corps.

3. Un coup d’arc peut être plus sévère qu’un coup de soliel, donc: a. Utiliser un bon masque avec un verre filtrant approprié ainsi qu’un verre blanc afin de se protéger les yeux du rayonnement de l’arc et des projections quand on soude ou quand on regarde l’arc.

b. Porter des vêtements convenables afin de protéger la peau de soudeur et des aides contre le rayonnement de l‘arc.

c. Protéger l’autre personnel travaillant à proximité au soudage à l’aide d’écrans appropriés et non-inflammables.

4. Des gouttes de laitier en fusion sont émises de l’arc de soudage. Se protéger avec des vêtements de protection libres de l’huile, tels que les gants en cuir, chemise épaisse, pantalons sans revers, et chaussures montantes.

5. Toujours porter des lunettes de sécurité dans la zone de soudage. Utiliser des lunettes avec écrans lateraux dans les

SAFETY zones où l’on pique le laitier.

6. Eloigner les matériaux inflammables ou les recouvrir afin de prévenir tout risque d’incendie dû aux étincelles.

7. Quand on ne soude pas, poser la pince à une endroit isolé de la masse. Un court-circuit accidental peut provoquer un

échauffement et un risque d’incendie.

8. S’assurer que la masse est connectée le plus prés possible de la zone de travail qu’il est pratique de le faire. Si on place la masse sur la charpente de la construction ou d’autres endroits éloignés de la zone de travail, on augmente le risque de voir passer le courant de soudage par les chaines de levage, câbles de grue, ou autres circuits. Cela peut provoquer des risques d’incendie ou d’echauffement des chaines et des câbles jusqu’à ce qu’ils se rompent.

9. Assurer une ventilation suffisante dans la zone de soudage.

Ceci est particuliérement important pour le soudage de tôles galvanisées plombées, ou cadmiées ou tout autre métal qui produit des fumeés toxiques.

10. Ne pas souder en présence de vapeurs de chlore provenant d’opérations de dégraissage, nettoyage ou pistolage. La chaleur ou les rayons de l’arc peuvent réagir avec les vapeurs du solvant pour produire du phosgéne (gas fortement toxique) ou autres produits irritants.

11. Pour obtenir de plus amples renseignements sur la sûreté, voir le code “Code for safety in welding and cutting” CSA

Standard W 117.2-1974.

PRÉCAUTIONS DE SÛRETÉ POUR

LES MACHINES À SOUDER À

TRANSFORMATEUR ET À

REDRESSEUR

1. Relier à la terre le chassis du poste conformement au code de l’électricité et aux recommendations du fabricant. Le dispositif de montage ou la piece à souder doit être branché à une bonne mise à la terre.

2. Autant que possible, I’installation et l’entretien du poste seront effectués par un électricien qualifié.

3. Avant de faires des travaux à l’interieur de poste, la debrancher à l’interrupteur à la boite de fusibles.

4. Garder tous les couvercles et dispositifs de sûreté à leur place.

Mar. ‘93 iv

SP-125 PLUS



v

Thank You

v

for selecting a QUALITY product by Lincoln Electric. We want you to take pride in operating this Lincoln Electric Company product

••• as much pride as we have in bringing this product to you!

Please Examine Carton and Equipment For Damage Immediately

When this equipment is shipped, title passes to the purchaser upon receipt by the carrier. Consequently, Claims for material damaged in shipment must be made by the purchaser against the transportation company at the time the shipment is received.

Please record your equipment identification information below for future reference. This information can be found on your machine nameplate.

Model Name & Number _____________________________________

Code & Serial Number _____________________________________

Date of Purchase _____________________________________

Whenever you request replacement parts for or information on this equipment always supply the information you have recorded above.

Read this Operators Manual completely before attempting to use this equipment. Save this manual and keep it handy for quick reference. Pay particular attention to the safety instructions we have provided for your protection.

The level of seriousness to be applied to each is explained below:

WARNING

This statement appears where the information must be followed exactly to avoid serious personal injury or loss of life .

CAUTION

This statement appears where the information must be followed to avoid minor personal injury or damage to this equipment .

SP-125 PLUS



v

TABLE OF CONTENTS

Page

Installation .......................................................................................................Section A

Technical Specifications ........................................................................................A-1

Identify and Locate Components ...........................................................................A-2

Select Suitable Location ........................................................................................A-3

Output Connections ...............................................................................................A-3

Input Connections..................................................................................................A-5

Code Requirements ..............................................................................................A-6

Operation .........................................................................................................Section B

Safety Precautions ................................................................................................B-1

General Description ...............................................................................................B-2

Design Features and Advantages...................................................................B-2

Welding Capability ..........................................................................................B-2

Limitations .......................................................................................................B-2

Controls and Settings ......................................................................................B-2

Welding Operations ...............................................................................................B-3

Overload Protection ...............................................................................................B-7

Learning to Weld....................................................................................................B-8

Application Chart .................................................................................................B-19

Accessories .....................................................................................................Section C

Accessories ...........................................................................................................C-1

Replacement Parts ................................................................................................C-2

Maintenance ....................................................................................................Section D

Safety Precautions ................................................................................................D-1

Items Requiring No Maintenance ..........................................................................D-1

Routine and Periodic Maintenance........................................................................D-1

Gun and Cable Maintenance.................................................................................D-2

Configuration of Components in Wire Feeding System.........................................D-2

Component Replacement Procedures ..................................................................D-3

Troubleshooting ..............................................................................................Section E

Safety Precautions.................................................................................................E-1

How To Use Troubleshooting Guide......................................................................E-1

Troubleshooting Guide ..........................................................................................E-2

Wiring Diagrams ..............................................................................................Section F

SP-125 Plus Wiring Diagram .................................................................................F-1

Parts Lists....................................................................................P263 Series & P202-E

vi

SP-125 PLUS



vii

SP-125 PLUS



.

INSTALLATION

TECHNICAL SPECIFICATIONS – SP-125 Plus

Standard Voltage/Frequency

115V/60Hz

115V/60Hz

115V/60Hz

INPUT – SINGLE PHASE ONLY

Input Current

20 Amps - Rated Output

25 Amps - Maximum Output

15 Amps - CSA Rated output

Duty Cycle

20% Duty Cycle – Rated DC Output

20% Duty Cycle - CSA Rated Output

RATED OUTPUT

Amps

90

63

Volts at Rated Amperes

18

20

A-1

OUTPUT

Welding Current Range (Continuous) Maximum Open Circuit Voltage

Rated DC Output: 0 - 90 amps 28

CSA Rated DC Output: 0 - 63 amps

Auxiliary Power

N/A

Useable Amperage Range 25 – 125 Amps

RECOMMENDED INPUT CABLE AND FUSE SIZES

Fuse or

Output Mode Input Voltage Breaker Size Input Amps Extension Cord

RATED

MAXIMUM

115V/60Hz

115V/60Hz

20 Amp

25 Amp

20

25

Three Conductor

#14 AWG

(2.1 mm 2 ) or Larger for up to

25 feet (7.6m)

CSA 115V/60Hz 15 Amp 15

Three Conductor

#12 AWG

(3.3 mm 2 ) or Larger for up to

50 feet (15.2 m)

Height

12.0 in

305 mm

PHYSICAL DIMENSIONS

Width

9.75 in

248 mm

Depth

16.5 in

419 mm

Weight

54 Ibs

24.3 kg

SP-125 PLUS



A-2

INSTALLATION

Read entire installation section before starting installation.

1

SAFETY PRECAUTIONS

WARNING


• Only qualified personnel should perform this installation.

• Only personnel that have read and understood the SP-125 Plus Operating Manual should install and operate this equipment.

• Machine must be plugged into a receptacle which is grounded per any national, local or other applicable electrical codes.

• The SP-125 Plus power switch is to be in the OFF (“O”) position when installing work cable and gun and when connecting power cord to input power.

2

ING AM

P RAN

GE

3

FIGURE A.1

5

IDENTIFY AND LOCATE

COMPONENTS

If you have not already done so, unpack the SP-125

Plus from its carton and remove all packing material around the SP-125 Plus. Remove the following loose items from the carton (see Figure A.1):

1. SP-125 Plus

2. Gun and cable assembly (1)

3. Literature and miscellaneous including: a) This operating manual b) A contact tip for .030” (0.8 mm) diameter wire.

4. 10 ft (3.0 m) work cable.

5. Work clamp.

6. Sample Spool of L-56 .025 MIG Wire.

7. Adjustable mixed-Gas Regulator & Hose.

For available options and accessories refer to the accessories section later in this manual.

7

1) As shipped from the factory, the SP-125 Plus gun is ready to feed .023 or .025 (0.6 mm) wire.

SP-125 PLUS



2

4

6

SELECT SUITABLE LOCATION

INSTALLATION

Work Clamp Installation

Attach the work clamp per the following: Locate the welder in a dry location where there is free circulation of clean air into the louvers in the back and out the front of the unit. A location that minimizes the amount of smoke and dirt drawn into the rear louvers reduces the chance of dirt accumulation that can block air passages and cause overheating.

A-3

1. Unplug the machine or turn the power switch to the

“OFF” position.

2. Insert the work cable terminal lug with the larger hole through the strain relief hole in the work clamp as shown in Figure A-3.

STACKING

3. Fasten securely with the bolt and nut provided.

SP-125 Plus’ cannot be stacked.

FIGURE A.3

TILTING

Strain Relief Hole

Each machine must be placed on a secure, level surface, either directly or on a recommended undercarriage. The machine may topple over if this procedure is not followed.

Work Cable

Nut & Bolt

OUTPUT CONNECTIONS

Refer to Figure A.2.

1. Work Cable Access Hole.

2. Gun Cable and Control Lead Access Hole.

3. Connector Block.

4. Gun Trigger Lead Connectors.

5. Positive (+) and negative (–) output terminals.

6. Wire Feed Gearbox and Gun Connector Block

7. Cable Clamp

8. Thumbscrew - Secures gun and cable assembly

9. Optional Spot/Stitch Timer Kit see Accessories .

Work Cable Installation


FIGURE A.2

the SP-125 Plus.

Work Clamp

1. Open the wire feed section door on the right side of

2. Pass the end of the work cable that has the terminal lug with the smaller hole through the Work

Cable Access Hole (1) in the case front.

5

25-125

SP-125 Plus

8

+

-

9

1

2



3 6 7

SP-125 PLUS

A-4

INSTALLATION

3. Route the cable under and around the back of the

Wire Feed Gearbox (6).

4.

For GMAW Only: Refer to Figure A.2. As delivered, the SP-125 Plus is wired for positive polarity.

This is the appropriate configuration for the Gas

Metal Arc Welding (GMAW) process. To complete installation, use the provided wing nut to connect the work cable’s terminal lug to the negative (–) output terminal (5) located above the Wire Feed

Gearbox (6). Make sure that both wing nuts are tight.

5.

For Innershield Only: Refer to Figure A.4. To wire for negative polarity, connect the short cable attached to the connector block (1) to the negative

(–) output terminal (2) and the work cable (3) to the positive (+) terminal (4).

3. Insert the connector on the gun conductor cable through the Gun Cable Access Hole (2) in the SP-

125 Plus case front. Make sure the connector is all the way in the metal connector block to obtain proper gas flow. Rotate the connector so control leads are on the underside and tighten the

Thumbscrew (8) in the connector block.

4. Connect the gun trigger control lead terminals to the two insulated 1/4" (6,4 mm) tab connector bushings located above the “Gun Trigger

Connection” decal in the wire feed section (4).

Either lead can go to either connector. Form the leads so that they are as close as possible to the inside panel.

CAUTION

FIGURE A.4

4

2

1

3

If the gun trigger switch being used is other than that supplied with the SP-125 Plus, the switch must be a normally open, momentary switch. The terminals of the switch must be insulated from the welding circuit. Malfunction of the SP-125 Plus will result if this switch shorts to the SP-125 Plus welding output circuit or is common to any electrical circuit other than the SP-125 Plus trigger circuit.

GAS CONNECTION

Refer to Figure A.5

When using the GMAW process, a cylinder of shielding gas, must be obtained. For more information about selecting gas cylinders for use with the SP-125 Plus, refer to the ACCESSORIES section.

GUN INSTALLATION

As shipped from the factory, the SP-125 Plus gun is ready to feed 0.023 - 0.025” (0,6 mm) wire. If 0.030”

(0,8 mm) wire is to be used install the 0.030” (0.8 mm) contact tip. Refer to the MAINTENANCE section for contact tip installation details.

Connecting Gun Cable to the SP-125 Plus

1. Refer to Figure A.2. Unplug the machine or turn power switch to the off “O” position.

2. Pass the insulated terminals of the gun trigger control leads, one at a time, through the Gun Cable and Control Lead Access Slot (2) in the case front.

The leads are to be routed under the Wire Feed

Gearbox (6) and through the Cable Hanger (7) on the inner panel.

WARNING

CYLINDER may explode if damaged. Keep cylinder upright and chained to support

• Keep cylinder away from areas where it may be damaged.

• Never lift welder with cylinder attached.

• Never allow welding electrode to touch cylinder.

• Keep cylinder away from welding or other live electrical circuits.

SP-125 PLUS



INSTALLATION

WARNING

BUILDUP OF SHIELDING GAS may harm health or kill.

• Shut off shielding gas supply when not in use.

• SEE AMERICAN NATIONAL

STANDARD Z-49.1, “SAFETY IN

WELDING AND CUTTING” PUB-

LISHED BY THE AMERICAN

WELDING SOCIETY.

A-5

3. Attach the flow regulator to the cylinder valve and tighten the union nut securely with a wrench. The flow regulator for carbon dioxide must have a plastic washer seated in the fitting that attaches to the cylinder to prevent leakage. Refer to K1800-1 in the accessories section.

4. Refer to Figure A.6. Attach one end of inlet gas hose to the outlet fitting of the flow regulator and tighten the union nut securely with a wrench.

Connect the other end to the SP-125 Plus Gas

Solenoid Inlet Fitting (5/8-18 female threads — for

CGA — 032 fitting). Make certain the gas hose is not kinked or twisted.

1. Chain the cylinder to a wall or other stationary support to prevent the cylinder from falling over.

Insulate the cylinder from the work circuit and earth ground.

INPUT CONNECTIONS


FIGURE A.5

Flow Regulator

Cylinder Valve

The SP-125 Plus has two input connections, the power input cable, and the Gas Solenoid Inlet Fitting.

Both are located on the rear of the machine.

FIGURE A.6

Gas Hose

Gas Solenoid

Inlet Fitting

2. With the cylinder securely installed, remove the cylinder cap. Stand to one side away from the outlet and open the cylinder valve very slightly for an instant. This blows away any dust or dirt which may have accumulated in the valve outlet.

WARNING

BE SURE TO KEEP YOUR FACE AWAY FROM THE

VALVE OUTLET WHEN “CRACKING” THE VALVE.

Never stand directly in front of or behind the flow regulator when opening the cylinder valve. Always stand to one side.

Power

Input

Cable

SP-125 PLUS



A-6

INSTALLATION

CODE REQUIREMENTS FOR INPUT

CONNECTIONS

Requirements For CSA Rated Output

WARNING

A line cord with a 15 amp, 125 volt, three-prong plug

(NEMA Type 5-15P) is factory installed. Connect this plug to a mating grounded receptacle which is connected to a 15 amp branch circuit with a nominal voltage rating of 115 volts to 125 volts, 60 hertz, AC only.

This welding machine must be connected to power source in accordance with applicable electrical codes.

With this installation, the SP-125 Plus can be used at an output of 63 amps, 20 volts, 20% duty cycle.

The United States National Electrical Code (Article

630-B, 1990 Edition) provides standards for amperage handling capability of supply conductors based on duty cycle of the welding source.

If there is any question about the installation meeting applicable electrical code requirements, consult a qualified electrician.

Requirements For Rated Output

A power cord with a 15 amp, 125 volt, three prong plug (NEMA Type 5-15P) is factory installed on the

SP-125 Plus. Connect this plug to a mating grounded receptacle which is connected to a 20 amp branch circuit with a nominal voltage rating of 115 to 125 volts,

60 Hertz, AC only.

The rated output with this installation is 90 amps, 18

Volts, 20% duty cycle (2 minutes of every 10 minutes used for welding).

CAUTION

Do not connect the SP-125 Plus to an input power supply with a rated voltage that is greater than 125 volts.

Do not remove the power cord ground prong.

Requirements For Maximum Output

In order to utilize the maximum output capability of the machine, a branch circuit capable of 25 amps at 115 to 125 volts, 60 Hertz is required. This generally applies when welding steel that is equal to or greater than 12 gauge, 0.105” (2.5 mm) in thickness.

SP-125 PLUS



OPERATION

Read entire Operation section before operating the SP-125 Plus.

WARNING


• Do not touch electrically live parts or electrode with skin or wet clothing. Insulate yourself from work and ground.

• Always wear dry insulating gloves.

FUMES AND GASES can be dangerous.

• Keep your head out of fumes.

• Use ventilation or exhaust to remove fumes from breathing zone.

WELDING SPARKS can cause fire or explosion.

• Keep flammable material away.

• Do not weld on closed containers.

ARC RAYS can burn eyes and skin.

• Wear eye, ear and body protection.

Observe all safety information throughout this manual.

B-1

SP-125 PLUS



B-2

GENERAL DESCRIPTION

OPERATION

The SP-125 Plus is a complete semiautomatic constant voltage DC arc welding machine. Included is a solid state controlled, single phase constant voltage transformer/ rectifier power source and a wire feeder for feeding solid steel electrode and cored electrode.

The SP-125 Plus is ideally suited for individuals having access to 115 volt AC input power, and wanting the ease of use, quality and dependability of both gas metal arc welding or GMAW (also known as MIG welding) and the Innershield electrode process (self shielded flux cored or FCAW). The SP-125 Plus is a rugged and reliable machine that has been designed for dependable service and long life.

● Reversible, dual groove drive roll. Drive roll will feed .023-.035” (0.6- 0.9 mm) diameter wire.

● Accommodates both 8” (200 mm) diameter and 4”

(100 mm) diameter spools of wire.

● No external shielding gas is required when used with Lincoln Innershield .035” (0,9 mm) NR®-211-

MP electrode.

● Easy to change polarity.

● Accepts optional Spot/Stitch Timer Kit.

WELDING CAPABILITY

The SP-125 Plus, as shipped, is rated at 90 amps, 18 volts, at 20% duty cycle on a ten minute basis. It is capable of higher duty cycles at lower output currents.

RECOMMENDED PROCESSES

LIMITATIONS

The SP-125 Plus can be used for welding mild steel using the GMAW, single pass, process which requires a supply of shielding gas or it can be used for the self shielded, Innershield electrode process (FCAW). The

SP-125 Plus is configured for use with the GMAW

(MIG) process as delivered from the factory.

Arc Gouging cannot be performed with the SP-125

Plus. The SP-125 Plus is not recommended for pipe thawing.

CONTROLS AND SETTINGS

OPERATIONAL FEATURES AND

CONTROLS

Refer to Figures B.1a & B.1b.

The SP-125 Plus has the following controls as standard: Power ON/OFF Switch, Voltage Control, Wire

Speed Control, and a Circuit Breaker.

DESIGN FEATURES AND

ADVANTAGES

1. Power ON/OFF Switch —

When the power is on the fan motor will run and air will be exhausted out the louvers in the front of the machine.

The welding output and wire feeder remain off until the gun trigger is pressed.

ON

OFF

● Operates on 115 volt input — no special wiring required.

●

●

Solid state output control.

“Cold electrode” until gun trigger is pressed for an added measure of safety.

● Overload protection — incorporates both a thermostat and a circuit breaker.

● Quality wire drive with electronic overload protection.

● Easy-to-set continuous range controls for precise setting of arc voltage and wire speed.

●

●

Continuous voltage control.

“Quick Release” idle roll pressure arm is easily adjusted.

2. Voltage Control — A continuous control that gives full range adjustment of power source output voltage.

Voltage can be adjusted while welding.

3. Wire Speed Control —

Controls the wire feed speed from 50 – 400 in /min (1.3 –

10 m/min). The control can be preset on the dial to the setting specified on the SP-

125 Plus Application Chart located on the inside of the wire feed section door. Wire speed is not affected when changes are made in the voltage control.

ON

ARC VOLTS

ARC VOLTS

WIRE SPEED

SP-125 PLUS



SP-125 PLUS

2

WELDING AMP RANGE

25-125

3

SP-125 Plus

Refer to Figure B.1b

FIGURE B.1a

4. Circuit Breaker – Protects machine from damage if maximum output is exceeded. Button will extend out when tripped (Manual reset).

5. Optional K695-2 Spot/Stitch Controls (see ACCES-

SORIES section) - If present, replaces Blank Panel

Assembly located on the center panel inside the case door:

Mode Switch - Selects between Spot, Stitch, or

Seam (normal welding) mode. Spot mode welds for an adjustable length of time (set by Time Control; see below) and then stops, whenever the gun trigger is depressed and held. Stitch mode cycles between welding and not welding for an adjustable length of time (also set by Time Control) while the gun trigger is depressed. In Seam mode the machine will weld continuously while the gun trigger is depressed. Releasing the gun trigger in any of the three modes will interrupt welding immediately.

Time Control - In Spot mode, controls spot mode

ON time between approximately .25 and 4.0 seconds. In Stitch mode, controls stitch mode ON time and OFF time simultaneously between .25 and 4.0

seconds each. This control is deactivated while in

Seam mode.

FIGURE B.1b

OPERATION

B-3

WELDING OPERATIONS

SEQUENCE OF OPERATION

Wire Loading

Refer to Figure B.2 AND B3.

The machine power switch should be turned to the

OFF (“O”) position before working inside the wire feed enclosure.

The machine is shipped from the factory ready to feed

4” (100 mm) diameter spools. A 4" (100 mm) diameter spool is mounted directly on the 5/8" (16 mm) diameter spindle that has a built-in adjustable friction brake to prevent overrun of the spool and excess slack in the wire. The wing nut at the end of the shaft is used to adjust the tension on the wire spool (See B.3 on the following page).

To use 8" (200 mm) diameter spools, the 2" (51 mm) diameter M15445 spindle must be used. Remove the spacer and wing nut at the end of the shaft. Insert spindle as shown in figure B.2. Reattach spacer and wing nut.

Note: When loading and removing the 8” Spools make sure that the wing nut (inside the wire spool spindle hub) is turned 90° from the wire spool spindle locking tab. If the wing nut is positioned in line with the locking tab, the tab cannot be depressed to load or unload the wire spool.

Make certain the start end of the wire, which may protrude through the side of the spool, does not contact any metallic case parts.

Optional

Wire Spool Spindle

FIGURE B.2

Locking Tab

8” Wire Spool

4

5

Be sure that this stud engages the hole in the wire spool.

+

-

To wire drive

Wire Spool must be pushed all the way on the spindle so that the spindle’s tab will hold it in place. The Wire Spool must rotate clockwise when wire is dereeled.

SP-125 PLUS



B-4

OPERATION

FIGURE B.3

FIGURE B.4

Wire Spindle Shaft

4" Wire Spool

2

Wing Nut and Spacer

To wire drive

Note: The brake should be adjusted with a spool of wire installed. When properly adjusted it should move freely but not coast.

Friction Brake Adjustments

1. With wire spool installed, check free movement and coast of the spool.

2. To tighten the brake turn the wing nut clockwise in

1/4 turn increments until coasting stops.

3. To loosen the brake turn the wing nut counterclockwise in 1/4 turn increments until the wire spool moves freely without coasting.

Wire Threading

Refer to Figure B.4

1. Release the Spring Loaded Pressure Arm (1) rotate the Idle Roll Arm (2) away from the Wire

Feed Drive Roll (3). Ensure that the visible, stenciled size on the drive roll matches the wire size being used.

2. Carefully detach the end of the wire from the spool. To prevent the spool from unwinding, do not release the wire until after step 5.

3. Cut the bent portion of wire off and straighten the first 4” (100 mm).

4. Thread the wire through the In-going guide tube

(4), over the drive roll (3), and into the out-going guide tube (5).

5. Close the idle roll arm and latch the spring loaded pressure arm (2) in place (now you may release the welding wire).

5

3

4

1

The Wire Drive Feed Roll can accommodate two wire sizes by flipping the wire drive feed roll over. The sizes are stenciled on the drive roll.

6. The idle roll pressure adjustment wing nut is normally set for mid-position on the pressure arm threads. If feeding problems occur because the wire is flattened excessively, turn the pressure adjustment counter-clockwise to reduce distortion of the wire. Slightly less pressure may be required when using 0.023 – 0.025” (0,6 mm) wire. If the drive roll slips while feeding wire, the pressure should be increased until the wire feeds properly.

WARNING

When inching the welding wire, the drive rolls, the gun connector block and the gun contact tip are always energized relative to work and ground and remain energized several seconds after the gun trigger is released.

7. Refer to Figure B.5. Remove gas nozzle and contact tip from end of gun.

8. Turn the SP-125 Plus ON (“I”).

9. Straighten the gun cable assembly.

10. Depress the gun trigger switch and feed welding wire through the gun and cable. (Point gun away from yourself and others while feeding wire.)

Release gun trigger after wire appears at end of gun.

11. Replace contact tip and gas nozzle.

12. Refer to Figure B-6. Cut the wire off 1/4” – 3/8”

(6 – 10 mm) from the end of the tip. The SP-125

Plus is now ready to weld.

SP-125 PLUS



FIGURE B.5

Gun Handle

Gas Diffuser

Contact Tip

Gas Nozzle

OPERATION

Contact Tip

Wire Electrode

FIGURE B.6

B-5

3/8" – 1/2" Electrical Stickout

Shielding Gas

When using the GMAW process, a cylinder of shielding gas, must be obtained. Refer to the ACCES-

SORIES section for more information about selecting gas cylinders for use with the SP-125 Plus.

1. For CO

2

, open the cylinder very slowly. For argonmixed gas, open cylinder valve slowly a fraction of a turn. When the cylinder pressure gauge pointer stops moving, open the valve fully.

2. If using a regulator with an adjustable flow meter, close the gun trigger and adjust the flow to give 15

– 20 cubic ft per hour (CFH) (7 – 10 I/min) [use 20

-– 25 CFH (10 – 12 I/min) when welding out of position or in a drafty location for CO

2

]. For argon mixed gas, trigger to release gas pressure, and turn off the adjust the flow to give 25 – 30 CFH

(12 – 14 I/min).

3. Keep the cylinder valve closed, except when using the SP-125 Plus. When finished welding: a) Close the cylinder valve to stop gas flow.

b) Depress the gun trigger briefly to release the pressure in the gas hose. c) Turn off the SP-125 Plus.

Making A Weld

1. See Recommended Processes And Equipment section for selection of welding wire and shielding gas and for range of metal thicknesses that can be welded.

2. See the Application Chart on the inside of wire feed section door for information on setting the

SP-125 Plus controls.

3. Set the Voltage (“V”) and Wire Speed (“olo’”) controls to the settings suggested for the welding wire and base metal thickness being used.



4. Check that the polarity is correct for the welding wire being used and that the gas supply, if required, is turned on.

5. When using Innershield electrode, remove the gas nozzle and install the gasless nozzle. This will improve visibility of the arc and protect the gas diffuser from weld spatter. Refer to the MAINTE-

NANCE section for details on nozzle replacement.

6. Refer to Figure B.7. Connect work clamp to metal to be welded. Work clamp must make good electrical contact to the workpiece. The workpiece must also be grounded as stated in “Arc Welding

Safety Precautions” in the beginning of this manual.

7. Position gun over joint. End of wire may be lightly touching the work.

8. Lower welding helmet, close gun trigger, and begin welding. Hold the gun so the contact tip to work distance is about 3/8 inch (10 mm).

FIGURE B.7

WORK CLAMP

WORKPIECE

ARC

GUN CABLE

SP-125 PLUS

B-6

OPERATION

9. To stop welding, release the gun trigger and then pull the gun away from the work after the arc goes out.

10. When no more welding is to be done, close valve on gas cylinder (if used), momentarily operate gun trigger to release gas pressure, and turn off the

SP-125 Plus.

CAUTION

It is important when changing between welding with steel wire and aluminum to exchange feeding components due to the lubricant applied to steel wire. Failure to do so may result in contaminated welds when welding aluminum.

------------------------------------------------------------------------

TABLE B.1 — SP-125 Plus Welding Procedures

Cleaning Tip And Nozzle

Clean the contact tip and nozzle to avoid arc bridging between the nozzle and contact tip which can result in a shorted nozzle, poor welds and an overheated gun.

Hint: Anti-stick spray or gel, available from a welding supply distributor, may reduce buildup and aid in spatter removal.

Process

Welding

Wire

Shielding

Gas 16 ga 14 ga 12 ga 10 ga

MIG DC+ .035 Dia

4043 Aluminum

Wire

100% Argon D-4.5 H-6.5 H-6.5 J-7.5

MIG DC+ .035 Dia

5356 Aluminum

Wire

100% Argon C-5.5 D-6 G-8.5 H-9.5

MIG DC+ .030 Dia 98% Argon/ D-3 F-4 J-5 J-6.5

308L Stainless 2% Oxygen

Steel Wire

PROCESS GUIDELINES

The SP-125 Plus can be used for welding mild steel using the GMAW, single pass, process which requires a supply of shielding gas or it can be used for the self shielded, Innershield electrode process.

The recommended gas and electrode for GMAW is welding grade mixed CO

2 and Argon (75-80%) gas and 0.025” (0 6 mm) diameter Lincoln L-56 mild-steel welding wire [supplied on 121/2 Ib (6 kg) spools]. For

14 gauge (2,0 mm) and thinner CO

2

, or blended gas is acceptable. A mixed gas consisting of 75 to 80%

Argon and 20 to 25% CO

2 is recommended for welding on heavier gauge [12 gauge (2,5 mm) for example] steel.

The recommended electrode for the self-shielded process is 0.035” (0,9 mm) diameter Lincoln

Innershield NR-211-MP on 10 Ib (4,5 kg) spools. This electrode can be used for all position welding of 20 gauge through 5/16” (1,0 – 8,0 mm) thick steel [multiple passes are required for 1/4” and 5/16” (6,0 and 8,0 mm)].

CHANGING MACHINE OVER TO

FEED OTHER WIRE SIZES

The SP-125 Plus is shipped from the factory ready to feed 0.023-0.025” (0,6 mm) diameter wire. To operate the SP-125 Plus with other sizes of wire, it is necessary to change the contact tip and change the drive roll over to other sizes. Refer to Changing the Contact

Tip and Changing the Drive Roll, in the MAINTE-

NANCE section, for specific information on these procedures.

WELDING WITH FCAW (Innershield)

Welding with Innershield requires an Innershield

Welding Kit. A gasless nozzle is provided in the

Innershield Welding Kit. When using Innershield electrode, installing the gasless nozzle will improve visibility of the arc and protect the gas diffuser from weld spatter. Additionally included is a gun cable liner to permit proper feeding of .035” (0,9 mm) Innershield wire. Refer to the ACCESSORIES section for details on obtaining this kit.

WARNING

Use of the GMAW process with the SP-125 Plus on thicker materials than recommended may result in poor welds. The welds may “look” good, but may just be “sitting” on top of the plate. This is called

“cold casting” and will result in weld failure.

The SP-125 Plus is suitable for .035" Aluminum wire and .030" stainless wire. Refer to Table B.1 for

Recommended Procedure Settings. Aluminum wire requires K663-1 Aluminum Welding kit. See ACCES-

SORIES section.

SP-125 PLUS



OPERATION

OVERLOAD PROTECTION

Output Overload

The SP-125 Plus is equipped with a circuit breaker which protects the machine from potential damage from excessive output current. The circuit breaker button will extend out when tripped. The circuit breaker must be manually reset.

Thermal Protection

The SP-125 Plus duty cycle is exceeded a thermostat will shut off the output until the machine cools to a normal operating temperature. This is an automatic function and is self resetting.

Wire Feed Overload Protection

If the SP-125 Plus has an automatic electronic protection circuit to protect the wire feed motor. If excessive motor overload occurs (due to excessive feeding force, jammed drive rolls, or shorted motor leads) the circuit will shut down the wire feed motor and the welding power output.

The wire feed shut-down circuit will reset automatically when the gun trigger is released. However shut-down will reoccur if the overload situation is not corrected.

B-7



SP-125 PLUS

B-8

LEARNING TO WELD


No one can learn to weld simply by reading about it.

Skill comes only with practice. The following pages will help the inexperienced operator to understand welding and develop this skill. For more detailed information, order a copy of “New Lessons in Arc Welding” listed at the end of this manual.

WARNING

Fumes and slag generated from

Innershield type electrodes recommended for use with this welding machine can be toxic.

• Avoid contact with eyes and skin.

• Do not take internally.

• Keep out of reach of children.

• Follow all safety precautions found in this operating manual.

THE ARC-WELDING CIRCUIT

The operator’s knowledge of arc welding must go beyond the arc itself. The operator must know how to control the arc, and this requires a knowledge of the welding circuit and the equipment that provides the electric current used in the arc. Figure B.7 illustrates the welding circuit for a typical welding machine. The circuit begins where the gun cable is attached to the welding machine. Current flows through the gun cable, gun, and contact tip, to the wire and across the arc.

On the work side of the arc, current flows through the base metal to the work cable and back to the welding machine. This circuit must be complete for the current to flow.

This machine’s welding circuit has a voltage output of

33 volts DC maximum. This voltage is quite low and is only present when the gun trigger is depressed.

To weld, the work clamp must be tightly connected to clean base metal. Remove paint, rust, dirt or oil as necessary and connect the work clamp as close as possible to the area you wish to weld. This helps prevent current from going through an unwanted path.

Avoid allowing the welding circuit to pass through hinges, bearings, electronic components, or similar devices that can be damaged. See Figure B.8. Always disconnect electrical devices before welding upon them.

The gun and cable assembly is held by the operator who guides the automatically fed wire along the joint, maintaining a contact tip to work distance of about 3/8 to 1/2 inch (10 – 12 mm). This is called electrical stickout. This electrical stickout (ESO) must be properly maintained by the operator. The electric arc is made in the gap between the work and the tip end of a small diameter wire. When the power source is properly set, the arc gap is maintained automatically.

Arc welding is a manual skill requiring a steady hand, good physical condition, and good eyesight. The operator controls the welding arc, and therefore, the quality of the weld made.

THE SELF-SHIELDED FCAW WELDING

ARC

Figure B.9 illustrates the action taking place in the self shielded FCAW (Innershield) welding arc. It closely resembles what is actually seen while welding.

FIGURE B.9

FIGURE B.8

Electronic Components

Cored Wire

Protective Slag

Weld Metal

Burning of core materials inside wire electrode results in shield of gas.

Arc Stream

Hinges

SP-125 PLUS



Bearings


The “arc stream” is seen in the middle of the picture.

This is the electric arc created by the electric current flowing through the space between the end of the wire electrode and the base metal. The temperature of this arc is about 6000°F, which is more than enough to melt metal. The arc is very bright, as well as hot, and cannot be looked at with the naked eye without risking painful injury. The very dark lens, specifically designed for arc welding must be used with the hand or face shield whenever viewing the arc.

THE GMAW (MIG) WELDING ARC

B-9

Figure B.10 illustrates the GMAW (MIG) welding arc.

Solid wire does not contain fluxes or ingredients to form its own shielding and no slag forms to protect the molten weld metal. For this reason, a continuous even flow of shielding gas is needed to protect the molten weld metal from atmospheric contaminants such as oxygen and nitrogen. Shielding gas is supplied through the gun and cable assembly, through the gas nozzle and into the welding zone.

The arc melts the base metal and actually digs into it much as water through a nozzle on a garden hose digs into the earth. The molten metal forms a molten pool or crater and tends to flow away from the arc. As it moves away from the arc, it cools and solidifies.

The function of the Innershield cored wire electrode is much more than simply to carry current to the arc. The wire core is composed of fluxes and/or alloying ingredients around which a steel sheath has been formed.

It is simply a stick electrode turned inside out in a continuous wire form.

Solid wire electrode

Base metal

Gas nozzle

Shielding gas

Weld metal

FIGURE B.10

The cored wire melts in the arc and tiny droplets of molten metal shoot across the arc into the molten pool. The wire sheath provides additional filler metal for the joint to fill the groove or gap between the two pieces of base metal.

The core materials also melt or burn in the arc and perform several functions. They make the arc steadier, provide a shield of smoke-like gas around the arc to keep oxygen and nitrogen in the air away from the molten metal, and provide a flux for the molten pool.

The flux picks up impurities and forms the protective slag on top of the weld during cooling.

When comparing the GMAW and FCAW processes, you can see that the principal difference between the two lies in the type of shielding used. GMAW uses gas for shielding, thus we have Gas Metal Arc Welding.

FCAW uses the melting or burning of the core ingredients for shielding, and is thus termed Self-Shielded

Flux Cored Arc Welding.

After running a weld bead, the slag may be removed with a chipping hammer and wire brush. This improves appearance and allows for inspection of the finished weld.

The recommended wire for Gas Metal Arc Welding

(MIG) is Lincolnweld 0.025” (0.6 mm) L-56 electrode.

Lincolnweld” L-56 is capable of welding a wide range of mild steels in all positions, however, more skill is required for out-of-position welding with the GMAW process.

Since machine size and output characteristics limit the size and type of wire electrode which can be used,

Lincoln 0.035" (0.9mm) NR-211-MP Innershield electrode is recommended for Self-Shielded Flux Cored

Arc Welding with this machine.

PROCESS SELECTION

By gaining knowledge of the differences between the two processes, you will be able to select the best process for the job you have at hand. In selecting a process, you should consider:

For GMAW (MIG) Process

1. Is most of my welding performed on 16 gauge and lighter materials?

SP-125 PLUS



B-10


2. Can I afford the extra expense, space, and lack of portability required for gas cylinders and gas supply?

JOINT TYPES AND POSITIONS

3. Do I require clean, finished-looking welds?

Five types of welding joints are: Butt Welds, Fillet

Welds, Lap Welds, Edge Welds and Corner Welds.

See Figure B.11.

If you have answered yes to all the above questions

GMAW may be the process for you. If you have answered no to any of the above questions, then you should consider using the FCAW process.

Of these, the Butt Weld and Fillet Weld are the two most common welds.

For FCAW (Innershield) Process

1. Do I want simplicity and portability?

2. Will welding be performed outdoors or under windy conditions?

3. Do I require good all position welding capability?

4. Will most welding be performed on 16 gauge and heavier, somewhat rusty or dirty materials?

5. Weld must be cleaned prior to painting.

Butt weld

Edge weld

Lap weld

Fillet weld Corner weld

COMMON METALS

Most metals found around the farm, small shop or home are low carbon steel, sometimes referred to as mild steel. Typical items made with this type of steel include most sheet metal, plate, pipe and rolled shapes such as channels and angle irons. This type of steel can usually be easily welded without special precautions. Some steels, however, contain higher carbon levels or other alloys and are more difficult to weld. Basically, if a magnet sticks to the metal and you can easily cut the metal with a file, chances are good that the metal is mild steel and that you will be able to weld the material. In addition, aluminum and stainless steel can be welded using the K664-1

Aluminum Welding Kit. For further information on identifying various types of steels and other metals, and for proper procedures for welding them, we again suggest you purchase a copy of “New Lessons in Arc

Welding”.

Regardless of the type of metal being welded, in order to get a quality weld, it is important that the metal is free of oil, paint, rust or other contaminants.

FIGURE B.11

Butt Welds

Place two plates side by side, leaving a space approximately one half the thickness of the metal between them in order to get deeper penetration.

Securely clamp or tack weld the plates at both ends, otherwise the heat will cause the plates to move apart.

See Figure B.12.

Now weld the two plates together. Weld from left to right (if right handed). Point the wire electrode down in the crack between the two plates, keeping the gun slightly tilted in the direction of travel. Watch the molten metal to be sure it distributes itself evenly on both edges and in between the plates. This is refered to as the “pull technique”. On thin gauge sheet metal, use the “push technique”. See “Welding Techniques for GMAW (MIG) Process”.

SP-125 PLUS




45°

B-11

FIGURE B.12

Penetration

Unless a weld penetrates close to 100% of the metal thickness, a butt weld will be weaker than the material welded together. In the example shown in Figure

B.13, the total weld is only half the thickness of the material thus the weld is only approximately half as strong as the metal.

FIGURE B.13

FIGURE B.14

In the example shown in Figure B.14, the joint has been welded so that 100% penetration could be achieved. The weld, if properly made, is as strong as or stronger than the original metal.

Fillet Welds

When welding fillet welds, it is very important to hold the wire electrode at a 45° angle between the two sides or the metal will not distribute itself evenly. The gun nozzle is generally formed at an angle to facilitate this. See Figure B.15.

FIGURE B.15

Welding In The Vertical Position

Welding in the vertical position can be done either vertical-up or vertical-down. Vertical-up is used whenever a larger, stronger weld is desired. Vertical-down is used primarily on sheet metal 5/32” (3.9 mm) and under for fast, low penetrating welds.

WARNING

Use of this unit on thicker materials than recommended may result in poor welds. The welds may

“look” good, but may just be “sitting” on top, of the plate. This is called “Cold Casting” and will result in weld failure.

Vertical-up And Overhead Welding

The problem, when welding vertical-up, is to put the molten metal where it is wanted and make it stay there. If too much molten metal is deposited, gravity will pull it downwards and make it “drip”. Therefore, a certain technique has to be followed.

When welding out-of-position, run stringer beads.

Don’t whip, break the arc, move out of the puddle, or move too fast in any direction. Use Wire Feed Speed

(WFS) in the low portion of the range. The general technique and proper gun angle is illustrated in Figure

B.16.

Generally, keep the electrode nearly perpendicular to the joint as illustrated. The maximum angle above perpendicular may be required if porosity becomes a problem.

SP-125 PLUS



B-12


MACHINE SET UP FOR THE

SELF-SHIELDED FCAW PROCESS

1. See PROCESS GUIDELINES in the OPERATION section for selection of welding wire and shielding gas, and for range of metal thicknesses that can be welded.

PROPER GUN ANGLE

FOR GMAW PROCESS

WELDING IN THE VERTICAL UP POSITION

PROPER GUN ANGLE

FOR FCAW PROCESS

WELDING IN THE VERTICAL UP POSITION

FIGURE B.16

Vertical-down Welding

Refer to Figure B.17 Vertical-down welds are applied at a fast pace. These welds are therefore shallow and narrow and, as such, are excellent for sheet metal.

Vertical-down welds may be applied to 5/32” (3.9 mm) and lighter material.

Use stringer beads and tip the gun in the direction of travel so the arc force helps hold the molten metal in the joint. Move as fast as possible consistent with desired bead shape.

The important thing is to continue lowering the entire arm as the weld is made so the angle of the gun does not change. Move the electrode wire fast enough that the slag does not catch up with the arc. Vertical-down welding gives thin, shallow welds. It should not be used on heavy material where large welds are required.

2. See the Application Guide on the inside of wire feed section door for information on setting the controls.

3. Set the “Voltage” and “Wire Speed” controls to the settings suggested on the Application Guide for the welding wire and base metal thickness being used.

The voltage control is marked “V” and the wire feed speed is marked ‘’olo.’’

4. Check that the polarity is correct for the welding wire being used. Set the polarity for DC(–) when welding with NR-211-MP Innershield electrode.

See Work Cable Installation in the INSTALLATION section for instructions on changing polarity.

5. When using Innershield electrode, the gasless nozzle may be used instead of a gas nozzle to improve visibility of the arc.

6. Connect work clamp to metal to be welded. Work clamp must make good electrical contact to the work piece. The work piece must also be grounded as stated in the “Arc Welding Safety Precautions” at the beginning of this manual.

FIGURE B.17

WELDING TECHNIQUES FOR THE SELF-

SHIELDED FCAW PROCESS

Four simple manipulations are of prime importance when welding. With complete mastery of the four, welding will be easy. They are as follows:

1. The Correct Welding Position

Figure B.18 illustrates the correct welding position for right handed people. (For left handed people, it is the opposite.)

Hold the gun (of the gun and cable assembly) in your right hand and hold the shield with your left hand. (Left handers simply do the opposite.)

When using the FCAW Process, weld from left to right (if you are right handed). This enables you to clearly see what you are doing. (Left handers do the opposite.) Tilt the gun toward the direction of travel holding the electrode at an angle as shown in Figure B.18.

SP-125 PLUS




B-13

Contact Tip

FIGURE B.18

WARNING


When using an open arc process, it

Is necessary to use correct eye, head and body protection.

Protect yourself and others, read

“ARC RAYS can burn” at the front of this manual.

2.

The Correct Way To Strike An Arc

1. Be sure the work clamp makes good electrical contact to the work.


3. Position face shield to protect face and eyes, close gun trigger, and begin welding. Hold the gun so that the contact tip to work distance is about 3/8 to 1/2 inch (10 – 12 mm).

4. To stop welding, release the gun trigger and the pull the gun away from the work after the arc goes out.

5. A ball may form at the tip end of the wire after welding. For easier restrikes (with Innershield wire) the ball may be removed by feeding out a few inches of wire and simply bending the wire back and forth until it breaks off.

6. When no more welding is to be done, turn off the machine.

3. The Correct Electrical Stickout (ESO)

The electrical stickout (ESO) is the distance from the end of the contact tip to the end of the wire.

See Figure B.19.

Once the arc has been established, maintaining the correct ESO becomes extremely important.

The ESO should be approximately 3/8 to 1/2 inch

(10 to 12 mm) long.

Wire Electrode

3/8 – 1/2” (10 – 12 mm)

Electrical Stickout (ESO)

FIGURE B.19

The easiest way to tell whether the ESO is the correct length is by listening to its sound. The correct

ESO has a distinctive “crackling” sound, very much like eggs frying in a pan. A long ESO has a hollow, blowing or hissing sound. If the ESO is too short, you may stick the contact tip or nozzle to the weld puddle and/or fuse the wire to the contact tip.

4. The Correct Welding Speed

The important thing to watch while welding is the puddle of molten metal right behind the arc. See

Figure B.20. Do not watch the arc itself. It is the appearance of the puddle and the ridge where the molten puddle solidifies that indicates correct welding speed. The ridge should be approximately 3/8”

(10 mm) behind the wire electrode.

Most beginners tend to weld too fast, resulting in a thin uneven, “wormy” looking bead. They are not watching the molten metal.

Solidifying ridge

FIGURE B.20

Molten puddle

SP-125 PLUS



B-14


Helpful Hints

1. For general welding, it is not necessary to weave the arc, neither forward or backward nor sideways.

Weld along at a steady pace. You will find it easier.

2. When welding on thin plate, you will find that you will have to increase the welding speed, whereas when welding on heavy plate, it is necessary to go more slowly in order to get good penetration.

For the SP-125 Plus, use the following:

Mild Steel 16 gauge or 1/16 inch

(1.6 mm)

Electrode

Voltage Setting “V”

Wire Feed Speed “o|o”

0.035" (0.9 mm)

NR-211-MP

Innershield Wire

E

2

3. When welding sheet metal 16 gauge (1.5 mm) and lighter, heat buildup may cause part warpage and burn through. One way to eliminate these problems is to use the back-stepping method illustrated in

Figure B.21.

Refer to Figure B.22.

1. Learn to strike an arc by positioning the gun over the joint and touching the wire to the work.

First weld from A to B; then from C to A; then from D to C; then from E to D, and so on.

B A C D E

Back-Stepping

FIGURE B.21

Practice

The best way of getting practice in the four skills that enable you to maintain:

1. Correct welding position

2. Correct way to strike an arc

3. Correct electrical stickout

4. Correct welding speed is to perform the following exercise.

2. Position face shield to protect face and eyes.

3. Depress gun trigger, hold gun so contact tip to work distance is about 3/8 to 1/2 inch (10 to 12 mm) and the gun is at proper angle.

4. After you strike the arc, practice the correct electrical stickout. Learn to distinguish it by its sound.

5. When you are sure that you can hold the correct electrical stickout, with a smooth “crackling” arc start moving. Look at the molten puddle constantly, and look at the “ridge” where the metal solidifies.

6. Run beads on a flat plate. Run them parallel to the top edge (the edge farthest away from you). This gives you practice in running straight welds, and also gives you an easy way to check your progress. The 10th weld will look considerably better than the first weld. By constantly checking on your mistakes and your progress, welding will soon be a matter of routine.

Contact

Tip

ESO

Gun Angle

FIGURE B.22

SP-125 PLUS




MACHINE SET UP FOR THE GMAW (MIG)

PROCESS

1. See PROCESS GUIDELINES in the OPERATION section for selection of welding wire and shielding gas, and for range of metal thicknesses that can be welded.

2. See the Application Guide on the inside of wire feed section door for information on setting the controls.

3. Set the “Voltage” and “Wire Speed” controls to the settings suggested on the Application Guide for the welding wire and base metal thickness being used.

The voltage control is marked “V” and the wire feed speed is marked ‘’olo.’’

4. Check that the polarity is correct for the welding wire being used. Set the polarity for DC(+) when welding with the GMAW (MIG) process. See Work

Cable Installation in the INSTALLATION section for instructions for changing polarity.

5. Check that the gas nozzle and proper size liner and contact tip are being used and that the gas supply is turned on. If adjustable, set for 15 to 20 cubic feet per hour (7 to 10 l/min.) under normal conditions, increase to as high as 35 CFH (17

I/min.) under drafty (slightly windy) conditions.

6. Connect work clamp to metal to be welded. Work clamp must make good electrical contact to the work piece. The work piece must also be grounded as stated in the “Arc Welding Safety Precautions” at the beginning of this manual.

WELDING TECHNIQUES FOR THE GMAW

(MIG) PROCESS

Four simple manipulations are of prime importance when welding. With complete mastery of the four, welding will be easy. They are as follows:

1. The Correct Welding Position

Figure B.23 illustrates the correct welding position for right handed people. (For left handed people, it is the opposite.)

When GMAW (MIG) welding on sheet metal, it is important to use the “forehand” push technique.

Hold the gun (of the gun and cable assembly) in your right hand and hold the shield with your left hand. (Left handers simply do the opposite.)

B-15

FIGURE B.23

When using the GMAW process on light gauge material, weld from right to left (if you are right handed).

This results in a colder weld and has less tendency for burn through.

2. The Correct Way To Strike An Arc

WARNING


When using an open arc process, it

Is necessary to use correct eye, head and body protection.

Protect yourself and others, read

“ARC RAYS can burn” at the front of this manual.

1. Be sure the work clamp makes good electrical contact to the work.


3. Position face shield to protect face and eyes, close gun trigger, and begin welding. Hold the gun so that the contact tip to work distance is about 3/8 to

1/2 inch (10 – 12 mm).

4. To stop welding, release the gun trigger and pull the gun away from the work after the arc goes out.

5. A ball may form at the tip end of the wire after welding. For easier restrikes, the ball may be removed by feeding out a few inches of wire and cutting off the end of the wire with wire cutters.

6. When no more welding is to be done, close the valve on the gas cylinder, momentarily operate the gun trigger to release gas pressure, then turn off the machine.

SP-125 PLUS



B-16

Contact Tip

Wire Electrode


Helpful Hints

1. For general welding, it is not necessary to weave the arc, neither forward or backward nor sideways.

Weld along at a steady pace. You will find it easier.

ESO

2. When welding on thin plate, you will find that you will have to increase the welding speed, whereas when welding on heavy plate, it is necessary to go more slowly in order to get good penetration.

3. When welding sheet metal 16 gauge (1.5 mm) and lighter, heat buildup may cause part warpage and burn through. One way to eliminate these problems is to use the back-stepping method illustrated in

Figure B.21.

FIGURE B.24

3. The Correct Electrical Stickout (ESO)

The electrical stickout (ESO) is the distance from the end of the contact tip to the end of the wire.

See Figure B.24.

Once the arc has been established, maintaining the correct ESO becomes extremely important.

The ESO should be approximately 3/8 to 1/2 inch

(10 to 12 mm) long.

The easiest way to tell whether the ESO is the correct length is by listening to its sound. The correct

ESO has a distinctive “crackling” sound, very much like eggs frying in a pan. A long ESO has a hollow, blowing or hissing sound. If the ESO is too short, you may stick the contact tip or nozzle to the weld puddle and/or fuse the wire to the contact tip.

4. The Correct Welding Speed

The important thing to watch while welding is the puddle of molten metal right behind the arc. See

Figure B.25. Do not watch the arc itself. It is the appearance of the puddle and the ridge where the molten Puddle solidifies that indicates correct welding speed. The ridge should be approximately 3/8”

(10 mm) behind the wire electrode.

Most beginners tend to weld too fast, resulting in a thin, uneven, “wormy” looking bead. They are not watching the molten metal.

Practice

The best way of getting practice in the four skills that enable you to maintain:

1. Correct welding position

2. Correct way to strike an arc

3. Correct electrical stickout

4. Correct welding speed is to perform the following exercise.

For the SP-125 Plus, use the following:

Mild Steel 16 gauge or 1/16 inch

(1.6 mm)

Electrode

Voltage Setting “V”

Wire Feed Speed “o|o”

Lincolnweld 0.025 L-56 electrode

CO

2

G

5

Weld metal ridge

Molten puddle

Base metal

Refer to Figure B.22.

1. Learn to strike an arc by positioning the gun over the joint and touching the wire to the work.

2. Position face shield to protect face and eyes.

3. Depress gun trigger, hold gun so contact tip to work distance Is about 3/8 to 1/2 inch (10 to 12 mm) and the gun is at proper angle.

FIGURE B.25

SP-125 PLUS




4. After you strike the arc, practice the correct electrical stickout. Learn to distinguish it by its sound.

5. When you are sure that you can hold the correct electrical stickout, with a smooth “crackling” arc, start moving. Look at the molten puddle constantly.

2. Decrease stickout.

3. Decrease WFS (wire feed speed.

4. Decrease travel speed.

5. Decrease drag angle.

6. Check for correct gas, if used.

6. Run beads on a flat plate. Run them parallel to the top edge (the edge farthest away from you). This gives you practice in running straight welds, and also gives you an easy way to check your progress. The 10th weld will look considerably better than the first weld. By constantly checking on your mistakes and your progress, welding will soon be a matter of routine.

To Reduce Spatter (in order of importance):

TROUBLESHOOTING WELDS

Good welds have excellent appearance.

1. Increase voltage.

2. Increase drag angle.


4. Increase WFS (wire feed speed).



To Eliminate Porosity (in order of importance):

1. Turn on gas supply, if used

2. Decrease voltage.

3. Increase stickout.




NOTE: Always be sure the joint is free from moisture, oil, rust, paint or other contaminants.

To Eliminate a Ropy Convex Bead

(in order of importance):

1. Increase voltage

B-17

To Correct Poor Penetration (in order of importance):



3. Increase voltage.

4. Decrease speed.



If Arc Blow Occurs (in order of importance):

NOTE: Try different ground connection locations before adjusting procedures.


2. Increase stickout.

3. Decrease voltage.

4. Decrease WFS (wire feed speed.


To Eliminate Stubbing* (in order of importance):

1. Increase voltage

2. Decrease WFS (wire feed speed)

3. Decrease stickout

4. Increase drag angle

* Stubbing occurs when the electrode drives through the molten puddle and hits the bottom plate tending to push the gun up.

SP-125 PLUS



B-18


Proper Gun Handling

Most feeding problems are caused by improper handling of the gun cable or electrodes.

1. Do not kink or pull the gun around sharp corners

2. Keep the gun cable as straight as practical when welding.

3. Do not allow dolly wheels or trucks to run over the cables.

4. Keep the cable clean.

5. Innershield electrode has proper surface lubrication. Use only clean, rust-free electrode.

6. Replace contact tip when it becomes worn or the end is fused or deformed.



SP-125 PLUS

APPLICATION CHART

B-19



SP-125 PLUS

C-1

OPTIONAL ACCESSORIES

ACCESSORIES

6. KP666-035C Knurled Drive Roll (optional) —

Reversible Drive Roll with double knurled grooves for .035 (0.9 mm) cored electrode.

1. K520 Utility Cart — Designed to transport the

Lincoln family of small welders. Has provisions for mounting a single gas cylinder. Has front casters and large rear wheels. Handle height is easily adjustable. Bottom tray provided for tools and accessories. Easy assembly required; takes less than 15 minutes.

7. K695-2 Spot / Stitch Timer Kit — Includes spot timer to control the spot welding arc time, and a stitch timer to control the on/off cycle time of the arc to prevent burnthrough on thin gauge metals.

Also includes spot welding nozzle.

2. K1800-1 CO

2

Adjustable Regulator and Hose Kit —

Includes an adjustable pressure flow regulator for use on CO

2 cylinders.

Weld shielding gas may be obtained from a welding supply distributor.

Also included is a gas hose which connects to the rear of the welder.

See “Gas Connection” in Installation section for installation instructions.

The Spot/Stitch Timer Kit installs inside the wire feed compartment, replacing the blank panel located below the gun trigger lead connectors, per the installation instructions included with the kit.

8. K697-1 Power Cord Extension — Extension 115V power cord (20’/6.1m) allows extra convenience when work is located some distance away from power receptacle.

3. K1799-1 Argon-Mixed Gas Adjustable

Regulator and Hose Kit (1)

Includes an adjustable pressure and flow regulator for use on argon-mixed gas cylinders. Also included is a gas hose which connects to the rear of the welder.

9. K549-1 .035 (0.9 mm) Innershield Welding Kit

Includes a contact tip, a gasless nozzle and a cable liner to permit the Magnum™ 100L gun and cable to use .035” (0.9 mm) diameter flux-cored electrode. Also included is a spool of .035 (0.9 mm)

Innershield NR-211-MP.

4 . K586-1 Deluxe Adjustable Gas Regulator &

Hose Kit

Accommodates CO

2 or mixed Gas Cylinders.

5. K663-2 Aluminum Welding Kit — This kit required for welding with .035 Aluminum wire.

Included with this kit are a drive roll, liner and contact tip. It is important when changing between welding with steel wire and aluminum to exchange these components due to the lubricant applied to steel wire. Failure to do so may result in contaminated welds when welding aluminum.

See Maintenance section for instructions on installing drive roll, cable liner, contact tip and their proper configuration.

(1) This regulator comes standard with a 4.5 foot hose with the SP125+.

SP-125 PLUS



INNERSHIELD (FCAW)

CONVERSION

ACCESSORIES

REPLACEMENT PARTS

Several changes are needed to convert the unit for operation with the Innershield (FCAW) process. The

K549-1 Innershield Kit includes all the necessary accessories for this conversion and are provided for this purpose. The following conversions should be made using the contents of this kit:

1. Change the output polarity to DC(-). See “Work

Cable Installation” section for details.

2. Install proper drive roll for the wire size selected.

See “Changing Drive Roll” in Maintenance section for details.

3. Install the proper gun liner and tip for the wire size selected. See “Component Replacement” in

Maintenance section for details.

4. Remove gas nozzle (if installed) and install gasless nozzle. To remove, simply unscrew.

Complete Gun and Cable Assembly

L8311-6 (K530-4)

Contact Tip .025” (0.6 mm)

S19726-1


S19726-2


S19726-3


S19726-4

Contact Tip-Tapered .025” (0.6 mm)

S20278-1


S20278-2


S20278-3

Contact Tip-Tapered .045” (1.2mm)

S20278-4

Liner .023 - .030” (0.6 - 0.8 mm)

M16291-2

Liner .030 - .035” (0.8 - 0.9 mm)

M16291-6

Liner .035/.045” (0.9/1.2 mm)

M16291-1

Gas Diffuser

S19728

Gas Nozzle

M16294

Gas Nozzle-Tip Recessed 3/8” (9.5 mm)

Opening I.D.

M16684


Opening I.D.

M16684-1


Opening I.D.

M16684-2

Spot Welding Nozzle

M17846-1

Gasless Nozzle (Innershield Only)

M16418

C-2

SP-125 PLUS



D-1

MAINTENANCE

SAFETY PRECAUTIONS

MAINTENANCE

WARNING


• Disconnect input power by removing plug from receptacle before working inside SP-125 PLUS. Use only grounded receptacle. Do not touch electrically “hot” parts inside SP-125 PLUS.

AFTER FEEDING 50# OF FLUX CORED

WIRE OR 300# OF SOLID WIRE

• Unplug machine or turn power switch to OFF – “O” position. Remove gun and cable from machine.

• Remove gas nozzle and contact tip from gun.

• Lay cable out straight - blow out gently into gun end with compressed air. Bend cable back and forth – blow out again – Repeat until clean.

WARNING

Excessive pressure at start may cause the dirt to form a plug.

• Have qualified personnel do the maintenance and trouble shooting work.

PERIODICALLY AS REQUIRED

• Blow dirt out of the welder with low pressure air to eliminate excessive dirt and dust buildup that could cause welder to run hot.

ITEMS REQUIRING NO

MAINTENANCE

• Drive Motor and Gearbox – Lifetime lubrication

• Fan Motor- Lifetime lubrication.

• Wire Reel Spindle – Do NOT lubricate shaft.

ROUTINE AND PERIODIC MAINTE-

NANCE

BEFORE EACH USE

• Check over machine and accessories for any obvious condition that may prevent safe performance or operation, repair or replace items as necessary to correct any abnormal condition.

AFTER 5 MINUTES OF WELDING or when spatter accumulates in nozzle

• Clean nozzle to avoid bridging between nozzle and contact tip which results in shorted nozzle, poor welds and overheated gun. Hint: Anti-stick spray or gel available from a welding supply distributor may reduce buildup and aid in spatter removal.

AFTER EACH SPOOL OF WIRE FEED

• Remove contact tip and clean inside diameter with short piece of wire

• Clean cable liner – when rough and erratic wire feeding occur.

• Blow dirt out of: Rectifier & Fan Motor Assembly;

PC Board located on Case Side Assembly; and

Center Assembly components.

• Vacuum accumulated dirt from gearbox and wire feed section.

• Inspect the incoming guide tube and clean inside diameter if necessary. Replace when excessively worn.

• Replace Contact Tip – when hole is enlarged or elongated (refer to “CHANGING THE CONTACT

TIP”, in this section).

• Replace gas nozzle.

• Replace Liner – when wire feeding problems occur and other items have been checked (refer to

“CHANGING LINER” procedure in this section).

• Replace internal gun handle parts as necessary

(see Procedure at the end of this section).

SP-125 PLUS



GUN AND CABLE

MAINTENANCE

FOR MAGNUM™ 100L GUN

MAINTENANCE

D-2

2. Replace worn contact tips as required. A variable or “hunting” arc is a typical symptom of a worn contact tip. To install a new tip, choose the correct size contact tip for the electrode being used (wire size is stenciled on the side of the contact tip) and screw it snugly into the gas diffuser.

Gun Cable Cleaning

Clean cable liner after using approximately 300 lbs

(136 kg) of solid wire or 50 lbs (23 kg) of flux-cored wire. Remove the cable from the wire feeder and lay it out straight on the floor. Remove the contact tip from the gun. Using low pressure air, gently blow out the cable liner from the gas diffuser end.

CAUTION

Excessive pressure at the start may cause the dirt to form a plug.

3. Remove spatter from inside of gas nozzle and from tip after each 10 minutes of arc time or as required.

4. Be sure the gas nozzle is fully screwed onto the diffuser for gas shielded processes. For the

Innershield® process, the gasless nozzle should be screwed onto the diffuser.

Flex the cable over its entire length and again blow out the cable. Repeat this procedure until no further dirt comes out.

Contact Tips, Nozzles, and Gun Tubes

1. Dirt can accumulate in the contact tip hole and restrict wire feeding. After each spool of wire is used, remove the contact tip and clean it by pushing a short piece of wire through the tip repeatedly.

Use the wire as a reamer to remove dirt that may be adhering to the wall of the hole through the tip.

5. To remove gun tube from gun, remove gas nozzle or gasless nozzle and remove diffuser from gun tube. Remove both collars from each end of the gun handle and separate the handle halves.

Loosen the locking nut holding the gun tube in place against the gun end cable connector.

Unscrew gun tube from cable connector. To install gun tube, screw the locking nut on the gun tube as far as possible. Then screw the gun tube into the cable connector until it bottoms. Then unscrew (no more than one turn) the gun tube until its axis is perpendicular to the flat sides of the cable connector and pointed in the direction of the trigger.

Tighten the locking nut so as to maintain the proper relationship between the gun tube and the cable connector. Replace the gun handle, trigger and diffuser. Replace the gas nozzle or gasless nozzle.

CONFIGURATION OF COMPONENTS IN WIRE FEEDING SYSTEM

Contact Tip Cable Liner Drive Roll

Components shipped with

SP-125 PLUS

S19726-1(In Gun)

.025” (0.6mm)

S19726-2(Loose)

.030” (0.8mm)

M16291-6

.035” (0.9mm)

M15448 Stenciled (.030 / .035)

2 Smooth grooves

Small .030 (0.8mm)

Large .035” (0.9mm)

KP666-035 Use Large groove K549-1 .035” (0.9mm)

Innershield Welding Kit

K663-2 .035 (0.9mm)

Aluminum or Stainless Kit*•

S19726-3

.035” (0.9mm)

S24221-1

.035A (0.9mm)

M16291-6

.035 (0.9mm)

M18971-1

.045” (1.2mm)

S24220 .035-3/64 (Drive roll)

S24219 (Idle roll)

KP666-035C M15448-1 Stenciled

2 Knurled grooves for .035” (0.9mm)

• If .030 Solid wire feeding is desired obtain an S19726-2 Contact Tip, an M16291-2 Cable Liner and an M15448 Drive Roll (Smaller Groove).

* It is important when changing between welding with steel wire and aluminum to exchange feeding components due to the lubricant applied to steel wire. Failure to do so may result in contaminated welds when welding aluminum.

Δ Recommended for best feeding performance.

SP-125 PLUS



D-3

MAINTENANCE

COMPONENT REPLACEMENT

PROCEDURES

CHANGING THE CONTACT TIP

1. Unplug or turn power switch to Off “O” position.

CAUTION

When inching the welding wire, the drive rolls, gun connector block, and gun contact tip are energized relative to work and ground and remain energized for several seconds after the gun trigger is released.

2. Refer to Figure D.2. Remove the gas nozzle from the gun by unscrewing counter-clockwise.

3. Remove the existing contact tip from the gun by unscrewing counter-clockwise.

4. Remove the drive roll, flip over and reinstall with the opposite groove closest to the gearbox.

4. Insert and hand tighten desired contact tip.

NOTE: The stencil of the groove that you want to use is marked on the outside of the drive unit

(when installed)

5. Replace gas nozzle.

CHANGING THE SP-125 Plus FOR USE

WITH INNERSHIELD FLUX CORED WIRE

5. Push a length of straightened welding wire through the wire feeder guide tubes and reset the Phillips

Head screw to secure the drive roll onto the shaft.

• Change The Contact Tip

6. Reapply the spring loaded idle arm tensioner.

1. Refer to Figure D.2. Remove the gas nozzle from the gun by unscrewing counter-clockwise.


7. Turn the power “ON” (I) and check the drive roll for slipping when feeding wire. DO NOT OVERTIGHTEN - If necessary, tighten or loosen the spring loaded idle arm tensioner (2).

3. Insert and hand tighten the contact tip for use with

0.035” Innershield Flux Cored Wire.

4. Replace gas nozzle – The gasless nozzle may be used instead of the gas nozzle to give improved visibility of the arc.

CHANGING DRIVE ROLL

The drive roll, Figure D.1 Item 1, has two grooves; one for .023" – .025" (0.6 mm) solid steel electrode and a larger groove for .030" (0.8 mm) solid and .035" (0.9 mm) flux-cored steel electrode. As shipped, the drive roll is installed in the .023"-.025" (0.6 mm) position.

If .030"/.035" (0.8/0.9 mm) wire is to be used, the drive roll must be reversed as follows:

1. Turn the power switch to OFF (marked “O”).

2. Release the spring-loaded idle arm tensioner, Figure D.1

Item 2, and lift the idle roll arm, Figure D.1 Item 3, away from the drive roll.

3. Loosen the Phillips Head screw holding the drive roll onto the drive shaft.

3

1

FIGURE D.1

2

SP-125 PLUS



MAINTENANCE

CHANGING LINER

D-4

1-1/4 (31.8 mm)

Liner Trim Length

NOTICE: The variation in cable lengths prevents the interchangeability of liners. Once a liner has been cut for a particular gun, it should not be installed in another gun unless it can meet the liner cutoff length requirement. Refer to Figure D.2.

Slotted

Set Screw

Brass Cable

Connector

Gas Diffuser

Contact Tip

(Threaded)

Gas Nozzle or

Gasless Nozzle

(Threaded)

Liner Assembly

(Liner bushing to be seated tight against brass cable connector)

FIGURE D.2

Liner trim length for gun with red trigger (Magnum™ 100L)

1. Remove gun and cable assembly from machine.

2. Remove the gas nozzle from the gun by unscrewing counter-clockwise.


4. Remove the gas diffuser from the gun tube by unscrewing counter-clockwise.

5. Lay the gun and cable out straight on a flat surface. Loosen the set screw located in the brass connector at the wire feeder end of the cable. Pull the liner out of the cable.

6. Insert a new untrimmed liner into the connector end of the cable. Be sure the liner bushing is stenciled appropriately for the wire size being used.

7. Fully seat the liner bushing into the connector. Tighten the set screw on the brass cable connector. At this time, the gas diffuser should not be installed onto the end of the gun tube.

8. With the gas nozzle and diffuser removed from the gun tube, be sure the cable is straight, and then trim the liner to the length shown in the Figure D.2.

Remove any burrs from the end of the liner.

9. Screw the gas diffuser onto the end of the gun tube and securely tighten.

10. Replace the contact tip and nozzle.

SP-125 PLUS



D-5

GUN HANDLE PARTS

MAINTENANCE

The gun handle consists of two halves that are held together with a collar on each end. To open up the handle, turn the collars approximately 60 degrees counter-clockwise until the collar reaches a stop. Then pull the collar off the gun handle. If the collars are difficult to turn, position the gun handle against a corner, place a screwdriver against the tab on the collar and give the screwdriver a sharp blow to turn the collar past an internal locking rib. See Figure D-3.

➣

Counter-clockwise

FIGURE D.3



SP-125 PLUS

TROUBLESHOOTING

E-1

HOW TO USE TROUBLESHOOTING GUIDE

WARNING

Service and Repair should only be performed by Lincoln Electric Factory Trained Personnel.

Unauthorized repairs performed on this equipment may result in danger to the technician and machine operator and will invalidate your factory warranty. For your safety and to avoid

Electrical Shock, please observe all safety notes and precautions detailed throughout this manual.

__________________________________________________________________________

This Troubleshooting Guide is provided to help you locate and remedy possible machine problems. Simply follow the threestep procedure listed below.

Step 1. LOCATE PROBLEM (SYMPTOM).

Look under the column labeled “PROBLEM

(SYMPTOMS)”. This column describes possible symptoms that the machine may exhibit. Find the listing that best describes the symptom that the machine is exhibiting.

Symptoms are grouped into the following categories: Output Problems; Feeding

Problems; Gas Flow Problems; and

Welding Problems.

Step 2. PERFORM EXTERNAL TESTS.

The second column labeled “POSSIBLE

AREAS OF MISADJUSTMENT(S)” lists the obvious external possibilities that may contribute to the machine symptom. Perform these tests/checks in the order listed. In general, these tests can be conducted without removing the case wrap-around cover.

Step 3. PERFORM COMPONENT TESTS.

If you have exhausted all of the recommended tests in Step 2, consult your local

Authorized Field Service facility.

CAUTION

If for any reason you do not understand the test procedures or are unable to Perform the tests/repairs safely, contact your LOCAL AUTHORIZED LINCOLN ELECTRIC

FIELD SERVICE FACILITY for assistance before you proceed.

___________________________________________________________________

CAUTION

If machine case sides and top are removed, the case front must be supported.

Failure to do this could result in mechanical or electrical damage to the SP-125 Plus.

___________________________________________________________________

SP-125 PLUS



E-2

TROUBLESHOOTING

TROUBLESHOOTING GUIDE

Observe Safety Guidelines detailed in the beginning of this manual.

PROBLEMS

(SYMPTOMS)

Major physical or electrical damage is evident.

POSSIBLE AREAS OF

MISADJUSTMENT(S)

OUTPUT PROBLEMS

Contact your LOCAL LINCOLN

AUTHORIZED FIELD SERVICE

FACILITY.

No wire feed, weld output or gas flow when gun trigger is pulled. Fan does NOT operate.

1. Make sure correct voltage is applied to the machine (115 vac).

2. Make certain that power switch is in the ON position.

RECOMMENDED

COURSE OF ACTION

No weld output or wire feed when gun trigger is pulled. Fan runs and gas flows normally.

No weld output when gun trigger is pulled. Fan runs, gas flows and wire feeds normally.

Contact your LOCAL LINCOLN

AUTHORIZED FIELD SERVICE

FACILITY.

1. Arc voltage may be set too low.

2. Gun tip may be worn – Replace.

Contact your local Lincoln

Authorized Field Service Facility.

3. Check for correct input voltage to machine.

No Wire feed, weld output or gas flow when the gun trigger is pulled -

Fan operates normally.

4. Gun or work cable may be faulty.

1. Check the circuit breaker located in the machine’s wire drive compartment. Reset if tripped.

2. The thermostat may be tripped due to overheating. Let machine cool. Weld within the duty cycle or remove any air obstruction to machine.

3. Wire feed motor may be overloaded. Correct feeding problem.

4. Gun trigger may be faulty.

CAUTION

If for any reason you do not understand the test procedures or are unable to Perform the tests/repairs safely, contact your

LOCAL AUTHORIZED LINCOLN ELECTRIC FIELD SERVICE FACILITY for assistance before you proceed.

SP-125 PLUS




TROUBLESHOOTING

E-3


PROBLEMS

(SYMPTOMS)

No wire feed when gun trigger is pulled. Fan runs, gas flows and machine has correct open circuit voltage (28 vdc maximum) – weld output.

Wire feed speed motor runs very fast. Weld output, gas flow and fan operate normally.



FEEDING PROBLEMS

1. If the wire drive motor is running check to see if the correct wire is in the machine.

RECOMMENDED


2. If the wire drive motor is running make sure that the correct drive rolls are installed in the machine.



3. Check for clogged cable liner or feeding problems.

1. Make sure that the wire speed control is not set at maximum.

PROBLEMS

(SYMPTOMS)

Low or no gas flow when gun trigger is pulled. Wire feed, weld output and fan operate normally.



GAS FLOW PROBLEMS

1. Check gas supply, flow regulator and gas hoses.

RECOMMENDED




2. Check gun connection to machine for obstruction or leaky seals.

CAUTION



SP-125 PLUS



E-4


TROUBLESHOOTING


PROBLEMS

(SYMPTOMS)

Arc is unstable – Poor starting



WELDING PROBLEMS

1. Check for correct input voltage to machine – 115 vac.

2. Check for proper electrode polarity for process.

3. Check gun tip for wear or damage – Replace.

4. Check for proper gas and flow rate for process.

5. Check work cable for loose or faulty connections.

6. Check gun for damage or breaks.

RECOMMENDED




CAUTION



SP-125 PLUS



WIRING DIAGRAMS

SP-125 PLUS WIRING DIAGRAM: CODE 10260, 10481

F-1

*

*

*

*

NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The specific diagram for a particular code is pasted inside the machine on one of the enclosure panels.

SP-125 PLUS



F-2

NOTES

SP-125 PLUS



SP-125 PLUS



NOTES

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Orders of $50 or less before discount or orders outside of North America must be prepaid with charge, check or money order in U.S. Funds Only.

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Telephone: 216-383-2211 or, for fastest service, FAX this completed form to: 216-361-5901

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James F. Lincoln Arc Welding

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Titles:

New Lessons in Arc Welding

Procedure Handbook “Twelfth Edition”

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How to Read Shop Drawings

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The American Century of John C. Lincoln $5.00

Welding Preheat Calculator

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Chinese

Korean

Arabic

WARNING

Spanish

AVISO DE

PRECAUCION

French

ATTENTION

German

WARNUNG

Portuguese

ATENÇÃO

●

●

Do not touch electrically live parts or electrode with skin or wet clothing.

Insulate yourself from work and ground.

●

●

No toque las partes o los electrodos bajo carga con la piel o ropa mojada.

Aislese del trabajo y de la tierra.

● Keep flammable materials away.

● Mantenga el material combustible fuera del área de trabajo.

●

●

Wear eye, ear and body protection.

Protéjase los ojos, los oídos y el cuerpo.

●

●

Ne laissez ni la peau ni des vêtements mouillés entrer en contact avec des pièces sous tension.

Isolez-vous du travail et de la terre.

● Gardez à l’écart de tout matériel inflammable.

● Protégez vos yeux, vos oreilles et votre corps.

●

●

Berühren Sie keine stromführenden

Teile oder Elektroden mit Ihrem

Körper oder feuchter Kleidung!

Isolieren Sie sich von den

Elektroden und dem Erdboden!

●

●

Não toque partes elétricas e electrodos com a pele ou roupa molhada.

Isole-se da peça e terra.

● Entfernen Sie brennbarres Material!

● Mantenha inflamáveis bem guardados.

● Tragen Sie Augen-, Ohren- und Körperschutz!

● Use proteção para a vista, ouvido e corpo.

Japanese

READ AND UNDERSTAND THE MANUFACTURER’S INSTRUCTION FOR THIS EQUIPMENT AND THE CONSUMABLES TO BE

USED AND FOLLOW YOUR EMPLOYER’S SAFETY PRACTICES.

SE RECOMIENDA LEER Y ENTENDER LAS INSTRUCCIONES DEL FABRICANTE PARA EL USO DE ESTE EQUIPO Y LOS

CONSUMIBLES QUE VA A UTILIZAR, SIGA LAS MEDIDAS DE SEGURIDAD DE SU SUPERVISOR.

LISEZ ET COMPRENEZ LES INSTRUCTIONS DU FABRICANT EN CE QUI REGARDE CET EQUIPMENT ET LES PRODUITS A

ETRE EMPLOYES ET SUIVEZ LES PROCEDURES DE SECURITE DE VOTRE EMPLOYEUR.

LESEN SIE UND BEFOLGEN SIE DIE BETRIEBSANLEITUNG DER ANLAGE UND DEN ELEKTRODENEINSATZ DES HER-

STELLERS. DIE UNFALLVERHÜTUNGSVORSCHRIFTEN DES ARBEITGEBERS SIND EBENFALLS ZU BEACHTEN.



●

●

Keep your head out of fumes.

Use ventilation or exhaust to remove fumes from breathing zone.

● Turn power off before servicing.

● Do not operate with panel open or guards off.

WARNING

●

●

Los humos fuera de la zona de respiración.

Mantenga la cabeza fuera de los humos. Utilice ventilación o aspiración para gases.

●

●

Gardez la tête à l’écart des fumées.

Utilisez un ventilateur ou un aspirateur pour ôter les fumées des zones de travail.

● Desconectar el cable de alimentación de poder de la máquina antes de iniciar cualquier servicio.

● Débranchez le courant avant l’entretien.

● No operar con panel abierto o guardas quitadas.

● N’opérez pas avec les panneaux ouverts ou avec les dispositifs de protection enlevés.

●

●

Vermeiden Sie das Einatmen von

Schweibrauch!

Sorgen Sie für gute Be- und

Entlüftung des Arbeitsplatzes!

● Strom vor Wartungsarbeiten abschalten! (Netzstrom völlig öffnen; Maschine anhalten!)

● Anlage nie ohne Schutzgehäuse oder Innenschutzverkleidung in

Betrieb setzen!

●

●

Mantenha seu rosto da fumaça.

Use ventilação e exhaustão para remover fumo da zona respiratória.

●

●

●

Não opere com as tampas removidas.

Desligue a corrente antes de fazer serviço.

Não toque as partes elétricas nuas.

●

●

Mantenha-se afastado das partes moventes.

Não opere com os paineis abertos ou guardas removidas.

Spanish

AVISO DE

PRECAUCION

French

ATTENTION

German

WARNUNG

Portuguese

ATENÇÃO

Japanese

Chinese

Korean

Arabic

LEIA E COMPREENDA AS INSTRUÇÕES DO FABRICANTE PARA ESTE EQUIPAMENTO E AS PARTES DE USO, E SIGA AS

PRÁTICAS DE SEGURANÇA DO EMPREGADOR.



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