Metal Inert Gas (MIG) welding, also sometimes called Gas Metal Arc Welding (GMAW) is a process that was developed in the 1940s for welding aluminium and other non-ferrous metals. MIG welding is an automatic or semi-automatic process in which a wire connected to a source of direct current acts as an electrode to join two pieces of metal as it is continuously passed through a welding gun. A flow of an inert gas, originally argon, is also passed through the welding gun at the same time as the wire electrode. This inert gas acts as a shield, keeping airborne contaminants away from the weld zone.
ADVANTAGES OF MIG WELDING:
- produces long, continuous welds much faster than traditional welding methods. Ideal for welding softer metals such as aluminium.
- capability to weld non-ferrous metals.
- produces a clean weld with very little splatter.
- can be used with a wide variety of metals and alloys.
DISADVANTAGES OF MIG WELDING:
- The equipment is quite complex. MIG welding requires a source of direct current, a constant source and flow of gas, as well as the continuously moving wire electrode.
- There is learning curve associated with MIG welding, even for experienced welders.
- The necessity for the inert gas shield means that MIG welding cannot be used in an open area where the wind would blow away the gas shield.
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