ABSTRACT
This chapter introduces the concept and fundamentals of A-tungsten inert gas (TIG), flux-bounded TIG, and flux-zoned TIG welding techniques, and summarizes the application of the techniques on different steels. It evaluates their performance in increasing the weld penetration. TIG welding process is a widely accepted welding process wherein high-quality joints are intended. A simple process of applying a thin layer of flux over the surface of the component to be welded before welding showed an outstanding increment in the weld penetration as compared to conventional autogenous TIG welding at same parameters. In activated TIG welding, the surface of the workpiece is covered with a thin layer of flux, which is usually a metal oxide. In TIG welding, the energy for the melting of the metal is obtained from the kinetic energy of arc constituents such as electrons and ions.
