An electric arc is automatically generated between the workpiece and a non-consumable tungsten electrode at the joint line. The parent metal is melted and the weld created with or without the addition of a filler rod. Temperatures at the arc can reach 12,000°C. The weld area is shielded with a stable stream of inert gas, usually argon, to prevent oxidation and contamination (Figure 11.1).
Figure 11.1 Tungsten Inert-gas Welding.
Most non-ferrous metals (except zinc), commonly aluminium; nickel; magnesium and titanium alloys; copper and stainless steel. ...