Gas metal arc welding (GMAW), also known as metal inert gas (MIG) welding or metal active gas (MAG) welding is a semiautomatic or automatic arc welding process in which a continuous and consumable the wire electrode and a shielding gas are fed through a welding gun. Originally developed for welding aluminum and other nonferrous metals in the 1940s Gas metal arc welding was soon applied to other steels because it allowed for lower welding time compared to other welding processes.
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