MIG (Metal Inert Gas) Welding
Denition 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 continu-
ous 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 trans-
fer 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 common used method
whereby the wire electrode is fed continuously down the welding torch through to and exiting the contact
tip. The wire touches the work piece and causes a short circuit the wire heats up and begins to form a molten
bead, the bead separates from the end of the wire and forms a droplet that is transferred into the weld pool.
This process is repeated about 100 times per second, making the arc appear constant to the human eye.
MIG Circuit Diagram
5 6
1. Mig Torch - 2. Work Piece - 3. Power Source - 4. Wire Feeder - 5. Wire Spool - 6. Gas
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