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Argon is the most commonly used gas. Helium is used for aluminum in some situations as the heat transfer thru it is better. A combination of the two is used in some shops. GTAW was first developed to weld aluminum during WWII and the process was called Heliarc (HELIum/electric ARC). Argon is cheaper to manufacture plus it being heavier than Helium it stayed down on the material being welded. Helium is a very light gas and floats away.
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Earn +20 ptsQ: What is the most common gas used in GTAW or TIG welding?
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