In tungsten inert gas arc welding (TIG), an arc is struck between a nonconsumable tungsten electrode and the workpiece. Gas shielding (to protect the molten metal from contamination) and constant amperage are supplied during the welding operation. Process Characteristics Uses nonconsumable tungsten electrode Uses shielding gases (Ar, He, or CO2) Produces very high quality welds Produces no slag or spatter Is readily applied to thin materials Please left click on the images for a better view or follow these links: Image #1 Image #2