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Tungsten inert gas welding is a constant current drooping arc process. It is also known as TIG, gas tungsten arc welding - GTAW, wolfram inert gas - WIG, and under the trade names of argon arc and heli arc.

TAFE NSW - Western Institute offers welding program like Basic Welding Skills, Gas Metal Arc Welding (GMAW), Gas Tungsten Arc Welding (GTAW), Manual Metal Arc Welding (MMAW), Welding to AS1796 Certification 1-9.

Welding Variables: Amperage : controls fusion and penetration. Voltage : controls arc length. Travel speed :controls depth of penetration. Gas flow rate :protects weld from atmosphere. Electrode extension :affects penetration.

Porosity cause by : Gas flow too low or too high. Leaking gas lines. Draughty conditions. Electrode stick out from nozzle too long. Contaminated/dirty weld prep. Contaminated/dirty wire. Incorrect gas shield. Arc length too long