Gas
tungsten arc welding (GTAW), also known as tungsten inert gas (TIG) welding, is
an arc welding process that uses a non-consumable tungsten electrode to produce
the weld. The weld area and electrode is protected from oxidation or other
atmospheric contamination by an inert shielding gas (argon or helium), and a
filler metal is normally used, though some welds, known as autogenous welds, do
not require it. A constant-current welding power supply produces electrical
energy, which is conducted across the arc through a column of highly ionized
gas and metal vapors known as a plasma.
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