GTAW, or TIG welding, is a precise welding process that uses a nonconsumable tungsten electrode and inert shielding gas. GTAW can be used on a wide variety of metals, and can be performed manually or ...

The shielding gas also influences the welding properties and has great ... Drawbacks with helium is a high cost and the low density. At TIG welding, high contents of helium will reduce the ...

The shielding gas flows through the outer jet, serving the same purpose as in TIG welding. Figure 4.1: Schematic diagram of plasma -welding. Resistor R limits the current in the pilot arc which can be ...