argon/helium mixtures.
The shielding gas forms the arc plasma, stabilizes the arc on the metal being welded, shields the arc and molten weld pool, and allows smooth transfer of metal from the weld wire pool.
MAG (Metal Active Gas) welding uses active oxidising gases, e.g. argon/O2(oxygen)/CO2(carbon dioxide) mixtures. The MAG process uses a Direct Current (DC) arc struck between a consumable electrode and a work piece.
Tungsten inert gas (TIG) welding is a high quality low deposition rate welding process. It uses an arc struck between a nonconsumable tungsten electrode and the work to fuse the base material and thereby form a welded joint.
The weld pool, the hot tungsten electrode and the melting filler wire are protected from atmosphere by a shield of inert or slightly reducing gas. Argon is often used although productivity and quality benefits can be gained by using mixtures of argon and helium or argon and hydrogen.
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