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TIG welding is mostly used for critical weld joints, welding metals other than common steel, and where precise, small welds are needed. TIG welding's proper name is Gas Tungsten Are Welding or "GTAW" This is the name the American Welding Society and other welding organisations refer to this process on their weldig procedures.
GTAW is also the abbreviation that welding engineers use to specify the welding process that is be used on blue Prints. TIG welding requires three things- heat, shielding, and filler metal.