This paper investigates the interphase corrosion attack (IPC) on gas tungsten arc welding (GTAW) process on interphase corrosion / intergranular attack and degree of sensitization (DOS) of Cr-Mn grade austenitic stainless steel (ASS) butt joints in three distinct regions: the base region (BR), heat-affected region (HAR), and weld region (WR) in chloride environment (3.5 percent NaCl under pH 5 condition).

Austenite with a tiny fraction of ferrite along the grain boundaries was found to be present in the weld region, whereas austenite and martensite phases were detected in the base region.

When compared to BR and WR, the HAR has a higher DOS % and more intergranular / interphase corrosion (IGC) than the BR and WR.

As a result of chromium depletion caused by the temperatures ranging involved in welding, the ASTM 262A micrographs show the ditch structure in the HAR.

This article is shared by Atmaramudu Tirumalla , Surjan Sheik and Raffi Mohammed.