Impax IM-MIG120 Instruction Manual page 29

MIG OPERATION
MIG Operation
The operation method is the same as the above
MIG operation except there are no gas options
and the output polarity is reversed (see pg 22).
WARNING! If you have no welding experience,
we recommend you seek training from an
experienced person.
CAUTION: This manual is a basic guide to
welding. We recommend you purchase a good
quality publication on welding or if you have
internet access visit one of the numerous
welding related web sites to be able to use the
welding power supply to its full potential.
IMPORTANT! It is VITAL that the workpiece is
perfectly clean at the point of weld. Any coating,
plating or corrosion MUST be removed,
otherwise a good weld will be impossible to
achieve.
Connect to the mains supply and press the
On/Off switch to the ON position (l) to stop the
machine press the switch to the OFF position
(0). Fig.23.
Fig 23
WARNING! Always wear a full face mask,
welding gloves and protective clothing. Wear
goggles while chipping slag.
Do not switch on the power supply until you are
ready to start welding. Practice welding on a
piece of scrap material.
The workpiece must be prepared correctly and
the area must be free from dirt, grease, oil, paint
and rust. Position the earth clamp as close to
the welding point as possible ensuring there is
good contact.
If you choose to do Gasless MIG welding, set up
the welder as detailed on page 22.
If you choose to do MIG welding with gas, set
up the welder as detailed on page 21.
Press the MMA/TIG/MIG switch to MIG mode.
Select the correct sized wire diameter by
pressing the wire selection button to the size
you require.
Ensuring the standard/spool gun switch is set to
standard.
If using gas, the gas shield required will be
either CO2 or Argon or a mix of CO2 & Argon.
Use the correct gas (when required) for the
material to be welded. When welding outside it
may be necessary to create a windbreak as a
break down in the gas shield can result in a
poor weld.
Important: If you are welding on a vehicle
disconnect the vehicles battery or fit an
electronic circuit protector.
Adjust the "current control knob" on the front
panel of the machine to get the correct welding
current.
Position the tip about 6mm from the material to
be welded, hold a face mask in front of your
face then press the trigger on the torch. When
the arc strikes move the torch along the
workpiece.
Maintain a steady gap between the end of the
contact tip and the workpiece. Maintain this
distance as constantly as possible during the
weld. The position of the welding rod is critical
to obtain the best result and achieve a good
quality bead. The torch should be positioned 75°
horizontally and 35° vertically. Make sure the
gas shroud remains clear of spatter as a build
up of spatter will reduce the flow / effect of the
gas shield. Keep the contact tip clean to ensure
smooth unrestricted wire feed. The use of an
anti-spatter spray will help to ensure a good
result.
When welding material up to 7mm in thickness
place the pieces 2-3mm apart, run the welding
bead along the join. A second bead can go
along the underside for extra strength (Fig.24).
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