Activated-TIG Welding

Abstract

A-TIG welding process involves a method of increasing the penetration capability of the arc in TIG welding. This is achieved through the application of a thin coating of activating flux material onto the work piece surface prior to welding. The effect of flux is to constrict the arc which increases the current density at the anode root and the arc force on the weld pool. The actual mechanism by which the application of flux constricting the arc is not fully understood. Despite the productivity benefits of A-TIG welding, industry to date has been slow in exploiting this process. This is partially because the use of the flux is seen as an additional cost and its application an additional operation. Furthermore, the commercial fluxes tend to produce an inferior surface finish compared to conventional TIG welding and produce a surface slag residue which is required to be removed. TWI has developed a new activating flux mitigating many of these disadvantages.

Keywords: A-TIG, welding, flux material