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Welding Help Electrode_TIG Printer-Friendly Page Back to Welding Help TIG Welding (GTAW or Gas Tungsten Arc) — Often called TIG welding (Tungsten Inert Gas), this welding process joins metals by heating them with a tungsten electrode which should not become part of the completed weld. Filler metal is sometimes used and argon inert gas or inert gas mixtures are used for shielding. Consumables: tungsten electrode, filler metal, shielding gas. TIG Electrode Rods TIG Electrode Rod Classification System TIG Torch and Tungsten Preparation