Techniques to weld similar and dissimilar materials by ATIG welding - an overview

ABSTRACT

Tungsten inert gas welding (TIG) is a widely used fusion welding process to produce a high quality of weld joint for the ferrous and nonferrous alloy with an esthetic weld bead. The limitation of this process is shallow penetration, which needs multi pass required for thick sections resulting in lower productivity. Activated tungsten inert gas (ATIG) welding process has revolutionized form of the TIG welding process to overcome its limitations. In these process fine layer of activated flux applied on the surface to get a higher depth of penetration in a single pass. This article summarized the ATIG process and its mechanism, various activated fluxes, and its effects on the joining of similar and dissimilar materials in terms of weld profile and properties.

KEYWORDS:

• ATIG
• FBTIG
• activated flux
• weld penetration
• Marangoni effect
• arc concentration
• weld profile