TIG WELDING - GAS TUNGSTEN ARC WELDING (GTAW)

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TIG welding (Tungsten Inert Gas Welding), also known as non melting inert gas arc welding. TIG welding is the most commonly used welding method whether in manual welding or automatic welding of 0.5-4.0mm thick stainless steel. TIG welding with filler wire is often used for backing welding of pressure vessels, because the gas tightness of TIG welding is good and can reduce the porosity of the weld during pressure vessel welding. The heat source of TIG welding is DC arc, the working voltage is 10-95 V, but the current can reach 600 A. Workpiece is connected to the positive electrode of the power supply, and the tungsten electrode in the welding torch is used as the negative electrode. The gas gtaw is generally argon.