In TIG (Tungsten Inert Gas), also known as Gas Tungsten Arc Welding (GTAW), an arc is drawn between a nonconsumable tungsten electrode and the workpiece. The electrode, the arc, and the weld-pool are protected from the atmosphere with an inert shielding gas. The hardfacing material is in the form of a rod. Advantages of the TIG process include simple manual operation and good control of the welding arc. The process can also be mechanised, in which case a manipulator is used to move the workpiece in relation to the welding torch and the hardfacing rod or wire.
Welding rods used for TIG welding are also used for hardfacing with the oxy-acetylene welding process.
With the correct operation, a very low level of iron dilution can be achieved in the overlay.
Rod is available in these standard diameters: