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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.

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

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we share about welding inspection tips,welding procedures and techniques for SMAW,MIG,TIG,FCAW,SAW and other welding process for stainlles steel and other alloys,equipments,welders,materials,inspector,NDT,NDE.

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.

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.