Today I Learned . . .
TIG welding stands for "Tungsten Inert Gas" (TIG) and is also known as gas tungsten arc welding.
TIG or GTAW welding is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. The weld area is protected from atmospheric contamination by an inert shielding gas (argon or helium), and a filler metal is normally used; Some welds, known as autogenous welds, do not require it. A constant-current welding power supply produces 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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