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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.

Delaware Welding Schools: TIG/Tungsten Inert Gas Welding This lesson about the principles of Tungsten Inert Gas (TIG) welding. You will be able to describe and explain TIG torches, electrodes, shielding gases, and welding filler materials.

This compact size instrument with an LSI circuit provides high reliability & durability. It has a selectable light source: tungsten, fluorescent, sodium & mercury.

Porosity. Is the result of gas being entrapped within the solidifying weld metal. Porosity will be present in a weld if the welding technique, materials used or condition of the weld joint promotes gas formation.

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.

In DC welding the electrode usually has negative polarity, which reduces the risk of overheating which may otherwise occur with electrode positive. The ionized gas or plasma stream can attain a temperature of several thousand degrees centigrade.