OPERATION
(11) Feed the wire through the drive roller into (12) Pull the trigger to drive the wire through
the inlet guide tube. Swing back and clip down the neck until it exits the contact tip holder.
the wire tension swing arm.
(13) Carefully open the gas cylinder valve (14) Set welding parameters using the knobs.
and set the required gas flow rate.
§4.3.9 MIG Welding
Definition of MIG Welding
MIG (metal inert gas) welding also known as GMAW (gas metal arc welding) or MAG (metal
active gas welding), is a semi-automatic or automatic arc welding process in which a
continuous and consumable wire electrode and a shielding gas are fed through a welding
gun. A constant voltage, direct current power source is most commonly used with MIG
welding. There are four primary methods of metal transfer in MIG welding, called short circuit
(also known as dip transfer) globular transfer, spray transfer and pulsed-spray, each of which
has distinct properties and corresponding advantages and limitations. To perform MIG
welding, the basic necessary equipment is a welding gun, a wire feed unit, a welding power
supply, an electrode wire, and a shielding gas supply. Short circuit transfer is the most
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