Rtech I-MIG160 MIG User manual

I-MIG160 MIG/MMA WELDER
OPERATION INSTRUCTIONS
www.r-techwelding.co.uk

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Thank you for selecting the R-Tech I-MIG160 Portable Inverter MIG/MMA Welder.
The I-MIG160 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 I-MIG160 as much pride as we have taken in making
this product for you. Please read all information in this manual before operation
PLEASE EXAMINE THE CARTON AND EQUIPMENT FOR DAMAGE IMMEDIATELY
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 equipment identification below for future reference. This information can be
found on the data plate at rear of machine.
Product: I-MIG160
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 a 2 year parts and labour warranty; we will cover the cost of collecting and
returning the item to you. External items, (torch, earth lead etc…) are covered by a 3 month warranty. Any
faults/damage found caused by a customer will be charged accordingly.
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
WARNING
This statement appears where the information must be followed exactly to avoid serious personal injury.
CAUTION
This statement appears where the information must be following to avoid a minor personal injury or damage
to this equipment.

Introduction
The R-Tech I-MIG160 is a member of our highly 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. 35% Duty cycle at 160 Amps @ 40C
7. 60% Duty cycle at 110 Amps @ 40C
8. Lightweight and portable – Ideal for maintenance and mobile welders
Recommended Processes
The R-Tech IMIG 160 is recommended for the MIG welding processes within its output capacity
of 160 Amps DC
Equipment Limitations
The R-Tech IMIG 160 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 IMIG 160 is rated at 160 Amps at 35% and 110 Amps @ 60% duty cycle on a ten
minute basis. If the duty cycle is exceeded a thermal protector will shut the machine off until it
cools.
Technical Specifications
Model No. R-Tech IMIG 160
Input 240V AC 50/60Hz
MIG Operation Fuse Rating 13A
Rated Output Current 160Amps Max
Generator required KVA 4.8KVA
Duty Cycle @ 160 AMPS 35% @ 40ºC
Duty Cycle @ 110 AMPS 60% @ 40ºC
Duty Cycle @ 85 AMPS 100% @ 40ºC
Output current Range 30-160 AMPS
MMA Operation Fuse Rating 13A

Rated Output Current 130Amps Max
Generator required KVA 4.8KVA
Duty Cycle @ 130 AMPS 35% @ 40ºC
Duty Cycle @ 100 AMPS 60% @ 40ºC
Duty Cycle @ 75 AMPS 100% @ 40ºC
Output current Range 30-130 AMPS
No Load Voltage 55-75V
Gross Weight 18 KG
Insulation Class F
Safety Precautions
Read entire section before starting installation
WARNING!
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
standards.
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.
Grinding
Do not direct grinding particles towards the welder. An abundance of conductive material can
cause plant failure.
Stacking
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.

WARNING!
Falling Equipment can cause injury. Never lift welder with gas bottle attached. Never lift above
personnel.
Tilting
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
WARNING!
ELECTRIC SHOCK CAN KILL
Machine grounding and High Frequency Interference Protection
This welder must be grounded to earth. See national electrical codes fro proper grounding
methods.
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
practical.
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 IMIG 160 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 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)
DO NOT USE ON A GENERATOR WITHOUT AVR. Connecting to a
generator without the above minimum requirements will in-validate your
warranty

Connections for IMIG 160
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.
2. 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 injury.
5. On/Off Power Switch This turns the IMIG 160 MIG Welder on and off.
6, Gas(+)/no gas(-) plug: gas style connect with “+”socket and no gas style connect with “-
“socket.
7, Spool gun socket: When use spool gun function, connect spool gun control plug(7pins)
with this socket and spool gun main cable connect with euro torch socket.

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. When the function is in
MMA, it shows the preset is welding amps.
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
8. Switch MIG/MMA.

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 Assembly 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.

Operating the Machine
SAFETY PRECAUTIONS
WARNING!
ELECTRIC SHOCK CAN KILL
Do not touch electrically live parts or electrode with skin or wet clothing.
Insulate yourself from work and ground
Always wear dry insulating gloves
WARNING!
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
area.
WARNING!
WELDING SPARKS can cause fire or explosion
Keep flammable material away from work area.
Do not weld on containers that have held combustibles
WARNING!
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 the Machine in MIG mode
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 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 IMIG 160 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

Operating the Machine in MMA mode
Connect the following:
1. Negative welding power connector
Connect the earth cable dinse plug into here and twist to secure
2. Positive welding power connector
Connect the electrode holder cable dinse plug into here and twist to secure
Most popular rods have a positive welding electrode and negative earth. If you are using special
electrodes check the manufacturer’s recommendation for correct polarity of welding electrodes
and connect as required.
1. Ensure machine is setup as previously stated
2. Fit desired electrode size in electrode holder
3. Switch on machine
4. Select desired welding power
5. Touch electrode on to workpiece and the arc will start
When the machine is switched on, output terminals are always live, take care and do not
touch electrode and earth by person at same time, otherwise an electric shock will occur.

Maintenance
Routine and periodic maintenance
WARNING!
ELECTRIC SHOCK CAN KILL
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 present
3. Keep the MIG torch and earth cables in good condition
4. Clean the air vents to ensure proper air flow and cooling
5. The fan motor has sealed bearings which requires no maintenance

Troubleshooting
Service & repair should only be performed by R-Tech welding trained personnel. Unauthorized
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:
www.r-techwelding.co.uk/support.php 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 the fuse blows again contact R-Tech
Machine keeps overheating - Warning light is lit on machine
Check if fan is running – if not contact R-Tech. 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 the condition of the MIG torch, try another MIG torch.