R-Tech INV160 Specifications

email: sales@r-techwelding.co.uk
Tel: 01452 733933
Fax 01452 733939
Thank you for selecting the R-Tech INV160 Portable Inverter Mig Welder.
The INV160 has many benefits over traditional transformer mig welders, including infinite
power control, adjustable arc force and a compact wire feed mechanism to provide very
smooth wire feed and weld characteristics
We want you to take pride in operating our INV160, as much pride as we have taken in
making this product for you. Please read all information in this manual before operation
When this equipment is shipped, title passes to the purchaser upon receipt from the courier.
Consequently all claims for material damaged in shipment must be made by purchaser against the
transportation company used.
Please record your welding equipment identification below for future reference. This information can be
found on data plate at rear of machine.
Product MIG INV160
Serial No. ___________________________________
Date of Purchase _____________________________
Where Purchased _____________________________
Whenever you request replacement parts or information on this equipment please always supply
information you have recorded above
This product is covered by 2 year parts and labour warranty, you are responsible for costs of shipping
unit to us, we will cover cost of returning item to you. External items, torch, earth lead etc are covered by
3 months warranty. Any faults/damage found caused by customer will be charged pro-rata.
Please read this operator manual completely before attempting to use this equipment.
Pay particular attention to the safety instructions we have provided you for your protection
The level of seriousness to be applied to each section is explained below
This statement appears where the information must be followed exactly to avoid serious
personal injury.
This statement appears where the information must be following to avoid a minor personal
injury or damage to this equipment.
The R-Tech INV160 is a member of our field acclaimed family of welding products.
Premium features include:1. Inverter power source – more efficient to operate, provides smoother weld
characteristics than traditional welders
2. Infinite welding voltage to allow fine tuning of weld characteristics
3. Adjustable arc force – controls splatter – ideal for automotive work
4. Digital amp & volt meters
5. Euro type torch fittings for easy torch fitment/replacement
6. 30% Duty cycle at 160 Amps @ 40C
7. 60% Duty cycle at 115 Amps @ 40C
8. Lightweight and portable – Ideal for maintenance and mobile welders
Recommended Processes
The R-Tech INV160 is recommended for the MIG welding processes within its output capacity
of 160 Amps DC
Equipment Limitations
The R-Tech INV160 is protected from overloads beyond the output ratings and duty cycle as
per machine specifications with thermostat protection of the output coils and rectifiers.
Welding Capability – Duty Cycle
The R-Tech INV160 is rated at 160 Amps at 30% and 115 Amps @ 60% duty cycle on a ten
minute basis. If the duty cycle is exceeded a thermal protector will shut machine off until the
machine cools.
Technical Specifications
Model No.
R-Tech MIG INV160
MIG Operation
240V AC 50/60Hz
Rated Input Power MAX
I-Eff Input Power
Fuse rating
Rated Output Current
Generator required KVA
Duty Cycle @ 160 AMPS
11A Continuous
13A slow blow
160Amps Max
30% @ 40ºC
Duty Cycle @ 115 AMPS
60% @ 40ºC
Duty Cycle @ 90 AMPS
100% @ 40ºC
30-160 AMPS
30-100 AMPS
Output current Range
No Load Voltage
Amperage range 0.6mm wire
Amperage range 0.8mm wire
Suitable Wire Diameter
Gross Weight
50-160 AMPS
0.6mm 0.8mm
18 KG
Class F
Safety Precautions
Read entire section before starting installation
Electric Shock can kill – Only qualified personnel should perform this installation. Turn off input
power at the fuse box before working on this equipment. Do not touch electrically live parts.
Always connect the machine to an earthed mains supply as per national recommended
Select suitable location
Place the welder where clean cooling air can freely circulate in and out of the front & rear louver
vents. Dirt, dust or any foreign material that can be drawn through vents into welder must be
kept to a minimum. Failure to observe these precautions can result in excessive operating
temperatures which can lead to plant failure.
Do not direct grinding particles towards the welder. An abundance of conductive material can
cause plant failure.
This machine cannot be stacked.
Transport – Unloading
Never underestimate the weight of equipment, never move or leave suspended in the air above
people. Use recommended lifting equipment at all times.
Falling Equipment can cause injury. Never lift welder with gas bottle attached. Never lift above
Machine must be placed on a secure level surface or on a recommended undercarriage/trolley.
This machine may topple over if this procedure is not followed.
Environmental Rating
The welding power source carries the IP21S rating. It may be used in normal industrial and
commercial environments. Avoid using in areas where water / rain is around.
Read and follow the ‘Electric Shock Warnings’ in the safety section if welding must be
performed under electrically hazardous conditions such as welding in wet areas or water on the
work piece.
Electrical Installation
Machine grounding and High Frequency Interference Protection
This welder must be grounded to earth. See national electrical codes fro proper grounding
The high frequency generator being similar to a radio transmitter may cause interference to
radio, TV and other electronic equipment. These problems may be the result of radiated
interference. Proper grounding methods can reduce or eliminate this.
Radiated interference can develop in the following ways
1. Direct interference from welder power source
2. Direct interference from the welding leads
3. Direct interference radiated from feedback into power lines
4. Interference from re-radiation by un-grounded metallic objects.
Keeping these contributing factors in mind, installing equipment as per following instructions
should minimize problems.
1. Keep the welder input power lines as short as possible and enclose as much of them as
possible in metal conduit or equivalent shielding. There should be a good electrical
contact between this conduit and ground (Earth).
2. Keep the work and electrode leads as short as possible. Tape the leads together where
3. Be sure the torch and earth leads rubber coverings are free from cuts and cracks that
allow welding power leakage
4. Keep earth lead connection to work in good condition – Clean area on workbench
where earth clamp is situated on a regular basis.
Input Connections
Make sure the voltage, phase and frequency of input power is as specified on machine rating
plate located at rear of machine.
Have a qualified electrician provide suitable input power as per national electrical codes. Make
sure machine is earthed / grounded.
Make sure fuse or circuit breaker is correct rating for machine. Using fuses or circuit breakers
smaller than recommended will result in ‘nuisance’ shut off from welder inrush currents even if
welding at low amperages.
Failure to follow these instructions can cause immediate failure within the welder and void
machines warranty.
Turn the input power OFF at the mains switch & fuse box before working on this equipment.
Have a qualified electrician install & service this mig welding equipment.
Allow machine to sit for 5 minutes minimum to allow the power capacitors to discharge before
working inside this equipment. Do not touch electrically live parts
The INV160 Mig Welder requires a 240V 50/60Hz 1-Phase supply. It requires a 13A supply. It
comes with a 3 metre mains cable attached.
Connect wires according to national coding.
Brown wire – Live
Blue wire – Neutral
Green/Yellow Wire – Earth (Ground)
Connecting to a mains electrical supply
Failure to connect to correct supply will in-validate your warranty
Connecting to an Engine Driven Generator
If connecting this machine to an engine driven generator please ensure
the following
Minimum Generator KVA Output – 4.8 KVA continuous
Generator to be fitted with AVR (automatic voltage regulation)
Connecting to a generator without the above minimum requirements will
in-validate your warranty.
Connections for MIG INV160
Setup machine as per two diagrams below:
Fig 1
Fig 2
1. Earth / Workpiece connector
Connect the earth lead (negative - ) to this connector.
Insert male connector into socket and twist clockwise until tight.
Secure other end of earth lead to Workpiece via the earth clamp.
Euro torch connector
Connect Euro type Mig torch to euro torch connector, align torch connector to machine
connector and then turn retaining ring clockwise to secure.
Ensure torch is secured tightly to avoid weld power problems
To avoid electric shock keep the Mig torch in good condition and replace if any of the
insulation is damaged.
3. Mains input cable
Fit required plug as per your electrical installation
4. Gas inlet connection
Connect gas hose to rear of machine and then to regulator on gas bottle. Ensure all
connections are tight to ensure no loss of gas.
Make sure gas bottle is secured to machine securely using supplied chain to avoid
5. On/Off Power Switch
This turns the INV160 Mig Welder on and off.
Controls and Settings
Fig 3
1. Welding Voltage
This adjusts the welding voltage (weld power) from 0 to 10. Adjust knob for power
output required by job, preset welding voltage is shown in LED (Fig3.4)
2. Wire Speed
This adjusts the wire feed speed from 0-100%
Adjust the wire speed to suit welding voltage (Fig3.1) and job requirements
When adjusting the wire feed speed a value is shown in the amperage LED (Fig3.5)
This feature allows you to record this value along with the preset welding voltage for
easy setup to specific job when several different welding jobs are being done
3. Arc Force
Gives further adjustment on weld characteristics, on traditional transformer machines
this was known as choke.
Lower setting = softer weld with less splatter and less penetration – for thinner materials
Higher setting = harsher weld with more splatter and penetration – for thicker materials
4. Voltage LED Display
This shows the preset welding voltage when no welding is being carried out
When welding this shows the actual welding voltage
This allows the machine to be calibrated to BS if required by your company
5. Amperage LED Display
This shows the preset wire feed speed when no welding is being carried out
When welding this shows the actual welding amperage
This allows the machine to be calibrated to BS if required by your company
6. Warning LED
This warning light will come on under these situations
Duty cycle of machine has been exceeded, the machine will stop working and the fan
will continue to run until machine has cooled down. The light will go off and welding
may be carried out again.
If duty cycle has not been exceeded the warning light comes on to warn of either
low input voltage has been sensed or there is an internal fault with machine
7. Power LED
This lights when machine is switched on
Wire Spool Fitment
1. Wire reel retainer
Push and twist in, to retain wire roll adaptor onto wire reel
2. Roller tensioner
Do not over tighten wire feed pressure roller as this can cause premature motor and
roller failure.
Correct way to adjust tensioner is to slacken off pressure so that mig welding wire does
not feed, slowly adjust pressure until wire feeds smoothly, you should be able to stop
wire feeding by holding wire and it should slip on rollers.
If you have too little pressure wire will slip when welding causing unwanted Burnback
into tips
3. Wire Feed Drive Assy
Make sure rollers are correct size for wire diameter selected, to change roller size
release retaining screw, remove roller turn roller around and slide onto shaft making
sure the right size groove is in line with wire and refit retaining screw.
The INV160 comes fitted with a dual roller 0.6mm and 0.8mm
4. Wire reel adaptor
Remove the wire reel retainer and wire reel adaptor, slide on roll of wire and refit the
reel adaptor (This can be reversed to suit different manufacturer’s reel sizes)
Refit the wire reel retainer by pushing in and twisting so it locks in
Operating Machine
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 & gases produced from welding.
Use ventilation or exhaust to remove fumes & gases from breathing zone and general
WELDING SPARKS can cause fire or explosion
Keep flammable material away from work area.
Do not weld on containers that have held combustibles
ARC RAYS can burn
Wear eye, ear and body protection – Make sure work area is protected by proper
shielding to avoid injury to passers by.
Operating Machine
Once you have set machine up as per above instructions.
1. Select welding voltage (power) required on front panel
2. Select wire feed speed required on ‘wire speed’ knob
3. Set ARC force switch to middle position for medium weld inductance (know as choke
on traditional welding power sources)
Low setting = Soft ARC (less splatter & penetration)
High setting = Strong ARC (more penetration)
4. Ensure you are wearing the correct safety clothes & equipment for welding (I.E Welding
mask, gloves, apron etc)
5. Press torch trigger to start welding process and adjust welding current knob to adjust
wire feed accordingly.
Note: You can finely adjust the welding current knob to fine tune weld arc length to
either DIP or SPRAY welding
DIP is when the wire is melting very close to the workpiece (Short arc length)
SPRAY is when the wire is melting far away from workpiece (Long arc length)
6. When welding actual voltage and amperage will be shown in corresponding LED
display meters on machine
1. Tips on welding aluminium
When welding aluminium as the wire is much softer than steel wire you have to fit a
teflon liner in place of the steel liner in mig torch, this is so the wire feeds much
smoother and stops it snarling at rollers.
To fit a teflon liner, remove steel liner from torch and fit teflon liner so you have
about 10 inches left coming out end of mig torch at the machine end. In the brass
euro body where torch fits onto you will see a brass guide tube, remove this tube
(you will have to remove circlip to allow this) and fit torch to machine and cut off
excess teflon liner as required. You want the teflon liner to get as close to the wire
feed rollers as possible. Best way to cut liner is with a sharp stanley knife blade.
Adjust the wire tensioner to minimum pressure and tighten down until wire is
gripped, too much pressure will deform wire and end up with snarls by rollers.
The INV160 is fitted with rollers suitable for both steel and alloy wire as standard
Fit oversize welding tip. These are available and have and ‘A’ after tip size. I.E 0.8A
where as for steel wire it would just say 0.8
2. Tips on using gasless wire
When using gasless wire is may be required to change the polarity of the arc. This
can be done simply by reversing the cables inside wire feed cabinet
Gas wire = Positive torch – Negative work (machine is set as standard)
Gasless wire = Negative torch – Positive earth
Routine and periodic maintenance
Turn the input power OFF at the mains switch & fuse box and remove mains plug from socket
before working on this equipment.
Have a qualified electrician install & service this equipment.
Allow machine to sit for 5 minutes minimum after disconnection from mains power to allow the
power capacitors to discharge before working inside this equipment.
Do not touch electrically live parts
1. Periodically (3-6 months depending on use / environment), remove the side/top panels
of machine and clean out machine with a low pressure dry air line paying particular
attention to PC Boards, Fan blades and switchgear
Failure to maintain plant can void manufacturers warranty.
2. Inspect input and output cables & hoses for fraying and cuts, replace if damaged
3. Keep mig torch and earth cables in good condition
4. Clean air vents to ensure proper air flow and cooling
5. The fan motor has sealed bearings which requires no maintenance
Service & repair should only be performed by R-Tech welding trained personnel. Unauthorised
repairs performed on this equipment may result in danger or injury to the technician and
machine operator and will invalidate your warranty.
For your safety and to avoid electric shock, please observe all safety notes and precautions
detailed throughout this manual
The troubleshooting guide is provided to help you locate possible machine malfunctions
If fault / problem is not listed below check our Mig Welder Support page on our website
or contact R-Tech by phone. Contact details can be found on our website
Output Problems
No output - Power light is not lit
Check machine on/off switch is in the ‘on’ position
Check Input power to machine
Check plug wiring
Check mains trip / fuses
No output - Fan runs - Power light is lit
Check torch connections are secure and torch switch operation, try replacing mig torch.
No output - Power light is lit - Warning light is lit
Welding application may have exceeded recommended duty cycle, allow machine to
cool down until the warning light goes out.
No output – Power light is lit – Gas at torch tip – No wire feed
Check wire feed unit protecting fuse on rear of machine, if blown
replace with new fuse of same rating, If fuse flows again contact R-Tech
Machine keeps overheating - Warning light is lit on machine
Check if fan is running – if not contact R-Tech for repair
Check the cooling vents for obstruction, blow out machine with clean dry low pressure
air supply.
Check for adequate ventilation around machine
Porosity in weld – No / low gas at torch tip
Check gas supply from gas bottle
Check flow rate on regulator
Check gas hose for restrictions
Check for draughts in local area, open doors etc
Replace mig torch – may have gas restriction
Poor weld penetration
Check condition of earth lead and clamp and ensure clamp is connection via a clean
area on work piece
Check condition of mig torch, try other mig torch
Wiring Diagram