MODEL NO: © Jack Sealey Limited
Original Language Version
ISSUE NO:4(SP) 12/01/17
InstructionS FOR:
Thank you for purchasing a Sealey product. Manufactured to a high standard this product will, if used according to these instructions
and properly maintained, give you years of trouble free performance.
 WARNING! It is the user’s responsibility to read, understand and comply with the following:
You must check all electrical equipment and appliances to ensure they are safe before using. You must inspect power supply leads, plugs and all electrical
connections for wear and damage. You must ensure the risk of electric shock is minimised by the installation of appropriate safety devices. An RCCB (Residual
Current Circuit Breaker) should be incorporated in the main distribution board. We also recommend that an RCD (Residual Current Device) is used with all
electrical products. It is particularly important to use an RCD together with portable products that are plugged into an electrical supply not protected by an RCCB. If
in doubt consult a qualified electrician. You may obtain a Residual Current Device by contacting your Sealey dealer. You must also read and understand the
following instructions concerning electrical safety.
1.1.1. The Electricity At Work Act 1989 requires all portable electrical appliances, if used on business premises, to be tested by a qualified electrician, using a Portable Appliance Tester (PAT), at least once a year.
1.1.2.The Health & Safety at Work Act 1974 makes owners of electrical appliances responsible for the safe Yellow & Green condition of the appliance, and the safety of the appliance operator. If in any doubt about electrical
Earth Wire
safety, contact a qualified electrician.
1.1.3. Ensure the insulation on all cables and the product itself is safe before connecting to the mains power
supply. See 1.1.1. & 1.1.2. above and use a Portable Appliance Tester (PAT).
1.1.4. Ensure that cables are always protected against short circuit and overload.
1.1.5. Regularly inspect power supply leads, plugs and all electrical connections for wear and damage and
especially power connections, to ensure that none is loose.
1.1.6. Important: Ensure the voltage marked on the product is the same as the electrical power supply to be Cable
used and check that plugs are fitted with the correct capacity fuse. A 13 amp plug may require a fuse Restraint
smaller than 13 amps for certain products, see fuse rating at right.
1.1.7. DO NOT pull or carry the powered appliance by its power supply lead.
1.1.8. DO NOT pull power plugs from sockets by the power cable.
13 AMP
1.1.9. DO NOT use worn or damaged leads, plugs or connections. Immediately replace or have repaired by a qualified electrician. A U.K. 3 pin plug must be fitted according to the following instructions. (UK only - see diagram at right).
Ensure the unit is correctly earthed via a three-pin plug.
a)Connect the green/yellow earth wire to the earth terminal ‘E’.
b)Connect the brown live wire to live terminal ‘L’.
c)Connect the blue neutral wire to the neutral terminal ‘N’.
d)After wiring, check that there are no bare wires, that all wires have been correctly connected, that the cable external
insulation extends beyond the cable restraint and that the restraint is tight.
1.1.10. Cable extension reels. When a cable extension reel is used it should be fully unwound before connection. A cable reel with an RCD fitted is recommended since any product which is plugged into the cable reel will be protected. The section of the cable on the cable reel is important and should be at least 1.5mm², but to be absolutely sure that the capacity of the cable is suitable for this product and for others that may be used in the other output sockets, we recommend the use of 2.5mm² section cable.
 WARNING! Be very cautious if using a generator to power the welder. The generator must be self-regulating and stable with regard to
voltage, wave form and frequency. The output must be greater than the power consumption of the welder. If any of these requirements is not met the electronics within the welder may be affected.
NOTE: The use of an unregulated generator may be dangerous and will invalidate the warranty on the welder.
 WARNING! The welder may produce voltage surges in the mains supply which can damage other sensitive equipment (e.g. computers). To prevent this happening, it is recommended that the welder is connected to a power supply that does not feed any sensitive equipment.
1.1.11 IMPORTANT! If using welder to full capacity, we recommend a 16amp supply. We recommend you discuss the installation of a 16amp industrial round pin plug and socket with your electrician.
DANGER! Unplug the welder from the mains power supply before performing maintenance or service.
Keep the welder and cables in good working order and condition. Take immediate action to repair or replace damaged parts.
Use genuine parts and accessories only. Unapproved parts may be dangerous and will invalidate the warranty.
Use an air hose to regularly blow out any dirt from the liner and keep the welder clean for best and safest performance.
Check and spray the gas cup and contact tip regularly with anti-spatter spray, available from your Sealey dealer.
Locate welder in a suitable work area. Ensure that the area has adequate ventilation as welding fumes are harmful.
Keep work area clean, tidy and free from unrelated materials. Also ensure the working area has adequate lighting and that a fire extinguisher is at hand.
WARNING! Use welding head shield to protect eyes and avoid exposing skin to ultraviolet rays given off by electric arc. Wear safety welding gauntlets.
Remove ill fitting clothing, remove ties, watches, rings and other loose jewellery and contain long hair.
Ensure the workpiece is correctly secured before welding.
Avoid unintentional contact with the workpiece. Accidental or uncontrolled use of the torch may be dangerous and will wear the nozzle.
Keep unauthorised persons away from the work area. Any persons working within the area must wear a protective head shield and gloves.
Operators must receive adequate training before using the welder.
Stand correctly keeping a good footing and balance, ensure the floor is not slippery and wear non-slip shoes.
© Jack Sealey Limited
Original Language Version
ISSUE NO:4(SP) 12/01/17
DO NOT operate the welder if it or the cables are damaged and DO NOT attempt to fit any unapproved torches or other components to the welder.
DO NOT get welder wet or use in damp or wet locations or areas where there is condensation.
DANGER! DO NOT weld near flammable solids, liquids or gases and DO NOT weld containers or pipes which have held flammable materials. Avoid welding materials which have been cleaned with chlorinated solvents or welding near such solvents.
DO NOT stand welder on a metal workbench, car bodywork or similar.
DO NOT touch any live metal parts of the torch or electrode while the machine is switched on.
DO NOT pull the welder by the cable, or the torch. Protect cables from sharp or abrasive items. DO NOT bend, strain or stand on cables or leads.
Protect from heat. Long lengths of slack must be gathered and neatly coiled. DO NOT place cables where they endanger others.
DO NOT touch the torch or workpiece immediately after welding as they will be very hot. Allow to cool.
DO NOT operate welder while under the influence of drugs, alcohol or intoxicating medication, or if tired.
When not in use store the welder in a safe, dry, childproof area.
2. INTRODUCTION & specification
IMPORTANT: These instructions contain the information you require to prepare your machine for welding, together with a maintenance and a troubleshooting
section. The instructions are not intended to teach you how to weld. If you have no experience, we recommend that you seek training from an expert source. MIG
welding is relatively easy, but does require a steady hand and supervised practice on scrap metal, as it is only with continued practice that you will achieve the
desired results.
INTRODUCTION: Our professional range of MIGHTYMIG welders all feature a heavy-duty high output transformer and forced air cooling to maximise duty cycle
performance. MIGHTYMIG100 is supplied with a comfort grip non-live torch, 1.8mtr earth cable, 0.45kg flux cored wire and 1.0mm contact tip.
Model No: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MIGHTYMIG100
Welding current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-100A
Wire Capacity - steel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9kg
Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60%@55A,20%@90A
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Forced Air
Torch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Non-live
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230V 1ph
Absorbed power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kW
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.5kg
Flux cored wire (0.9kg x Ø0.9mm) . . . . . . . . . . . . . . . . . . . . . . . TG100/1
Replacement tips (Pack of 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . TG100/2
3.1.6 Fitting a reel of wire:
Depress the silver button in the front of the handle and open the top compartment. See A & B in fig.1. The welder is supplied with a mini spool containing 0.45kg of flux cored wire.
Referring to fig.2, rotate the butterfly nut (5) anti-clockwise and remove it from the threaded spindle together with the pressure disc (4). Leave the spring (1) on the spindle (2).
Place the wire reel (3) over the spindle and down onto the spring ensuring that the wire will withdraw from the spool in a forwards direction and on the same side of the compartment as the wire feed unit.
Push lightly down on the top of the reel of wire and screw the pressure disc (4) onto the end of the spindle and down onto the top of the wire reel. The reel take off pressure should be set to provide a mild braking effect to prevent overrun where loose coils of wire form on the reel. Do not overtighten the
pressure disc as too much braking will conflict with the wire tension set on the wire drive unit. Lock the position of the pressure disc by screwing the
butterfly nut (5) down on top of it. Referring to fig.1 turn the knob on the wire lock screw (C) anti-clockwise and lift it up and away from the pressure roller moulding. Swing the pressure roller moulding (D) away from the drive roller.
Release the wire from the spool (do not allow wire to uncoil) and straighten 40-50mm of wire and gently push through the flexible plastic guide and through the 0.9mm feed roller groove (fig.3) and into the torch liner. fig.1
© Jack Sealey Limited
Original Language Version
ISSUE NO:4(SP) 12/01/17
3.1.7 Referring to fig.4, move the pressure roller moulding back round onto the grooved drive wheel and swing down the wire lock screw to lock it in place. See section 3.2 regarding wire tension.
3.1.8 Feeding the wire through to the torch. (See fig.5) Remove gas cup (a) and contact tip (b) from end of torch as follows:
a) Take torch in left hand with the torch tip facing to the right.
b) Grasp gas cup firmly in your right hand.
c) Turn gas cup clockwise only and pull cup out to the right.
WARNING! do not turn gas cup anti-clockwise, as this will damage internal spring.
d) Unscrew the copper contact tip (right hand thread) to remove.
3.1.9 Check welder is switched OFF and that the earth clamp is away from the torch tip. Connect the welder to the mains power supply and set the voltage switch to MIN.
3.1.10 Set the wire speed knob to position 5 or 6. Keeping the torch cable as straight as possible and press the torch switch. The wire will feed through the torch.
3.1.11 When wire has fed through, switch welder off, unplug from mains.
a) Take torch in left hand, slide the contact tip over the wire and screw it back into place.
b) Grasp gas cup in right hand, push onto torch head and turn clockwise only.
WARNING! do not turn gas cup anti-clockwise, as this will damage internal spring.
c) Cut wire so that it is just protruding from the cup.
3.2. Setting wire tension.
IMPORTANT: You must set the correct tension, too little or too much tension will cause problematic wire feed and result in a poor weld.
3.2.1 Correct tension between the rollers is checked by slowing down the wire between gloved fingers. If the pressure roller skids the tension is correct. Try to use the lowest tension possible as too high a tension will deform the wire. When you have completed welding allow the welder to cool before storing in a safe, dry place. Note: Damaged torches and cables are not covered under warranty.
4. WELDING Principles
IMPORTANT: These instructions are not intended to teach you how to weld. If you have no experience, we recommend that you seek training from an expert source. MIG welding is relatively easy, but does require a steady hand and supervised practice on scrap metal, as it is only with continued practice that you will achieve the desired results.
Mig/Mag welding:
Welding wire is automatically fed through an insulated liner to the tip of the torch. The torch consists of a switch, liner, and control cable. The switch
activates the wire feed roller. Releasing the switch stops wire feed. The weld current is transferred to the electrode (the wire) from the contact tip at the torch end. The current to the electrode is set using the rocker switch on the front of the control panel. Wire speed must be adjusted according to current output using the rotary control positioned to the left of the control panel. The higher the current the faster the wire speed. The torch is connected to the positive side of a DC rectifier, and the negative clamp is attached to the workpiece.
4.2.1 To ensure a complete circuit, the negative lead must be securely attached to the workpiece close to the weld area. Best connection is obtained by grinding the point of contact on the workpiece before connecting the clamp.
4.2.2 The weld area must be free of paint, rust, grease, etc.
Thermal Protection:
Should the welder become overheated due to prolonged use beyond the stated duty cycle the thermal protection will cause the welder to cut out and the orange light on the front panel will illuminate. Wait for fifteen minutes for the welder to cool down at which time it will reconnect automatically.
© Jack Sealey Limited
Original Language Version
ISSUE NO:4(SP) 12/01/17
On the front panel of the welder is the ratings plate, giving the
following data:
1 -The BS/EU standard relating to the safety and construction of arc welding and associated equipment.
2 -Single phase transformer.
3 -Symbol indicates welding with a continuous flow of welding wire.
4 -Symbol for Single-phase AC supply.
5 -Rating of internal protection provided by casing.
6 - Output U0 Rated minimum and maximum no load voltage.
I2, U2 Current and corresponding voltage.
Welding ratio based on a 10 minute cycle.
20% indicates 2 minutes welding and 8 minutes rest,
100% would indicate continuous welding.
Rated supply voltage and frequency.
7 -Mains Supply U1
I1max Maximum current.
I1eff Maximum effective current.
8 -Welding current range.
9 - Serial Number. Specifically identifies each welder.
6.1. 6.1.1
6.2. 6.2.1
6.3. 6.3.1 6.4.
DANGER! Unplug the welder from the mains power supply before performing maintenance or service.
Wire feed unit:
Check the wire feed unit at regular intervals. The feed roller wire guide plays an important part in
obtaining consistent results. Poor wire feed affects the weld. Clean the rollers weekly, especially the feed roller groove, removing all dust deposits.
Protect the torch cable assembly from mechanical wear. Clean the liner from the machine
forwards by using compressed air. If the liner is blocked it must be replaced.
Turning feed roller IMPORTANT: Turn the feed roller to suit the wire size.
There are two grooves on the feed roller, 0.6mm and 0.9mm. Always have the groove that is being used on the outside of the roller (nearest to you). To turn the feed roller first loosen the wire tension knob and move it into its up position (see fig.8-1) then move the tensioning roller assembly to its down position (see fig.8-2). Take hold of the triangular knob on the roller retainer and rotate it 90°anticlock wise to release it as shown in fig.8.3. Now pull the roller retainer off the drive spindle to reveal the roller as shown in fig.9. Pull the roller off the drive spindle, flip it over and put it back on the drive spindle. (See fig.10) The groove size you require should now be visible on the face of the roller. Push the roller retainer back onto the drive spindle with the opening facing right. Ensure that the flanges at the base of the retainer, seat fully into the circular recess in the main moulding and then rotate the retainer through 90° to lock it in place.
Contact tip (to remove tip follow steps in 3.1.8):
The contact tip is a consumable item and must be replaced when the bore becomes enlarged or oval. The contact tip MUST be kept free from spatter.
Gas cup (to remove cup follow steps in 3.1.8):
The gas cup must also be kept clean and free from spatter. Build-up of spatter inside the gas cup can cause a short circuit at the contact tip which will result in expensive machine repairs. To keep the contact tip free from spatter, we recommend the use of anti-spatter spray (MIG/722307) available from your Sealey dealer.
Replacing wire liner:
A worn or damaged wire liner will seriously affect the performance of the welder and should be
immediately replaced. First wind the wire back onto the spool and secure it. Remove the four screws securing the torch cable clamp to the wire feed unit (fig.11) and take off the clamp.
Open the torch case by gripping the torch with one hand and turning the grooved ring at the base of the torch anticlockwise until it stops, then pull it off the torch onto the torch cable. See fig.12-1.
Take hold of the back end of the moulding which contains the switch and pull it outwards and
downwards to release it from the other moulding as shown in fig.12.
© Jack Sealey Limited
Original Language Version
ISSUE NO:4(SP) 12/01/17
Push the liner lock ring (2) firmly towards the brass nut and withdraw the liner from the nut. With the torch cable as straight as possible pull the liner from the torch cable.
Insert the new liner into the torch cable and secure it in the wire drive unit by replacing the torch cable clamp. See fig.11. Insert the other end of the liner through the locking ring and fully into the brass nut in the torch head. See 2 in fig.12.
Check that the torch inner parts are properly seated in their respective mouldings then close the torch by inserting the tongue on the switch moulding (fig.12-5) into the slot at the front of the other moulding. Swing the switch moulding downwards and forwards until both parts have closed around the torch cable. Slide the ribbed ring (fig.12-1) onto the end of the torch handle and turn it clockwise to lock.
Weld current interrupted
Overheating protection activated due to overload
Protection automatically resets when transformer has cooled (approx. 15 min)
No weld current
Rectifier blown
Replace rectifier
No weld current
Bad connection between clamp and workpiece
Clean or grind contact surface and weld area
Break in earth lead
Repair or replace earth lead
Break in torch lead
Repair or replace
Gear damaged or worn
Replace gears
Motor defective
Replace motor (Contact service agent)
Pressure roller improperly adjusted
Adjust tension
Dirt, copper, dust, etc. have collected in torch liner
Clean the liner from the machine forward. Use compressed air. If too much dirt
Gas cup (nozzle) or tip defective
Replace gas cup (nozzle) and/or tip. Check roller tension (Section 3)
Deformed wire
Adjust roller tension
Dirt, etc, in liner
Clean the liner from the machine forward using compressed air
Gas cup (nozzle) or tip defective
Replace gas cup (nozzle) and/or tip
Gas cup (nozzle) spattered
Clean or replace gas cup (nozzle)
Feed roller groove clogged
Clean feed roller
Feed roller groove deformed
Replace feed roller
Pressure roller tension incorrect
Adjust tension
Incorrect settings
Check settings
Impurities in weld area
Clean and/or grind workpiece
Worn or defective gas cup (nozzle)
Replace gas cup (nozzle)
Rusty/dirty joints
Clean or grind the workpiece
Torch too far from, or at wrong angle to, workpiece
Gas cup to workpiece should be 8-10mm. Torch angle approx 75°
Worn or defective gas cup (nozzle)
Replace gas cup (nozzle)
Wire deformed
Check roller tension
Wire speed too slow
Increase wire speed
Torch incorrectly held
Use correct torch angle
Wire weaving in weld pool
Check roller tension and adjust
Weld current too low
Increase power and wire speed
Weld speed too fast
Move torch slower and weave a little more
Weld current too high
Increase power and wire speed
Weld speed too slow
Move torch faster and weave less
Weld current too low
Increase current and wire speed
Arc too long
Bring torch closer to workpiece
Weld current too high
Decrease current and wire speed
Weld speed too slow
Move torch faster
Incorrect distance of torch to workpiece
Torch distance should be 8-10mm
Feed motor not working
Wire does not feed, feed roller rotates
Wire feeds unevenly
Unstable arc
Porous weld
Wire sticking in gas cup (nozzle)
Irregular weld head
Weld bead too narrow and raised
Weld bead too wide
Poor penetration
Excessive penetration
Environmental Protection
Recycle unwanted materials instead of disposing of them as waste. All tools, accessories and packaging should be
sorted, taken to a recycling centre and disposed of in a manner which is compatible with the environment.
When the product becomes completely unserviceable and requires disposal, drain off any fluids (if applicable)
into approved containers and dispose of the product and the fluids according to local regulations.
NOTE: It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts without prior notice.
IMPORTANT: No liability is accepted for incorrect use of this product.
WARRANTY: Guarantee is 12 months from purchase date, proof of which will be required for any claim.
Sole UK Distributor, Sealey Group,
Kempson Way, Suffolk Business Park,
Bury St. Edmunds, Suffolk,
IP32 7AR
© Jack Sealey Limited
Original Language Version
01284 757500
01284 703534
ISSUE NO:4(SP) 12/01/17
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