<P> 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 . </P>
<P> 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 . </P>
tig welding the welding zone is shielded by an atmosphere of
tig welding the welding zone is shielded by an atmosphere of
an inert shielding gas ( argon or helium )
an inert shielding gas ( argon or helium )