This arc welding process uses a non-consumable tungsten electrode to produce the weld. The weld area is protected from atmospheric contamination by shielding gas (usually argon) and filler metal, though some welds, known as autogenous welds, do not require it. A constant-current welding power supply produces energy that is conducted across the arc through a column of highly ionized gas and metal vapors known as plasma.
TIG welding is most commonly used to weld thin sections of alloy steel, stainless steel and nonferrous metals such as aluminum, magnesium and copper alloys. The process grants the operator greater control over the weld, allowing for strong, high-quality welds. TIG is comparatively more complex and difficult to master than other processes and is significantly slower.
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