Impax IM-MULT160-K Instruction Manual page 27

MIG OPERATION
Converting To MIG Gas Welding
For welding stainless steel or aluminium, it is
necessary to convert your NO-GAS machine to
GAS operation. This is a simple process once
you have purchased the following parts:
Set up the machine as per Fig.2 on page 21.
Welding Wire: Either Mini or 5kg wire spools, at
0.6mm, 0.8mm, 0.9mm & 1mm diameter.
Contact Tips: The appropriate tip must be used
to suit the thickness of wire being used. i.e.,
0.8mm wire requires a 0.8mm tip and 1.0mm
wire requires a 1.0mm tip.
Gas Regulator: Decide in advance whether you
are going to use disposable or rechargable gas
bottles as this will effect the type of regulator
purchased.
Gas: Disposable gas bottles are available from
your dealer, or rechargeable bottles from your
welding supply shop.
Always use the appropriate gas for the material
being welded.
Carbon Dioxide (CO2): For Mild Steel
Argon: For Aluminium
CO2/Argon Mix: For Thin Sheet & Stainless Steel
Burnback Control
The Burnback control function improves the
crater filling quality and welding quality, Fig.14.
Fig 14
The burn-back time refers to the period from the
time wire feed ending to the time welding
voltagebeing cut off. Adjust the burn-back time
potentiometer on the middle plate to get the
proper electrode stick-out. One second after the
arc stops, the gas supply will be cut off.
Attaching A Gas Bottle & Regulator
Fit a suitable regulator and gas supply tube onto
your gas bottle (Please note; regulator and gas
bottle not supplied). Attach the other end of
your gas supply tube onto the gas pipe
attachment point on the back of the welder
(Fig.15).
Fig 15
Note: shielding gas is not required when using
flux cored welding wire.
Adjusting The Gas Flow
Turn the control knob on your gas regulator until
the required gas flow is achieved. We
recommend 20 cfm.
Adjusting The Output (Fig.16)
Set the amperage using the current control knob
(16.1), the voltage using the voltage control knob
(16.2) and the wire speed control knob (16.3).
Note: The current control knob is for MMA & TIG
mode only.
Fig 16
16.1
Located on the front panel, switching from one
setting to another adjusts the output and wire
speed. On thin materials use a low setting
through to a higher speed for thicker materials.
Welding on thick materials will significantly
reduce the duty cycle of the welder.
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16.2 16.3