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MIG (metal inert gas) and MAG (metal active gas) welding are
widely used wherever medium and high fusion rates are required.
Both techniques use a DC arc burning freely between the workpiece
and a wire electrode, which functions simultaneously as a power
carrier and a source of filler metal.
A protective gas envelope shields the arc, the drop transfer process
and the melt from the atmosphere.
For MIG welding, the gas is inert: argon or an argon-helium mix.
MAG welding uses a mixture of argon with an active gas such as
oxygen, CO2 or
both.
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