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This standard is applicable to gas shielded arc welding and cutting processess with gases and gas mixtures defined within. Applications include, but are not limited to: Tungsten inert gas (TIG) welding. Metal active gas (MAC) welding. Metal inert gas (MIG) welding. Plasma arc welding (PAW). Plasma arc cutting (PC). Back shielding. The purpose of this standard is to classify shielding gases in accordance to their chemical properties as a base for the approval of shielding gas and filler wire combinations. Gas purities and mixing tolerances are also specified.