Abstract:
Austenitic stainless steel (ASS) is the most common type of stainless steel which offers excellent weldability and mechanical
properties. ASS is being used for various applications i.e. automotive, oil and gas and chemical industries in which
the welding process plays a prominent role. Welding process selection is the main factor that emphasizes mechanical
and corrosion resistance properties in various aggressive environments. There are various corrosion occurs in ASS but
intergranular corrosion (IGC) forms during welding at elevated temperatures. IGC mainly occurs at grain boundaries of
structure and resulting chromium depletion due to precipitation of chromium carbide at the grain boundary. In present work
pulsed current gas tungsten arc welding (PCGTAW) process was used to investigate intergranular corrosion by oxalic acid
test as per ASTM A262 Practice A. Experiments performed based on Taguchi L9 using design of experiments and corrosion
rates are evaluated at base metal, heat affected zone and weld zone. This work is aimed to optimize process parameters
followed by regression analysis to IGC susceptibility in the weldment. In this investigation, it has been found from ANOVA
and main effects plots that peak current and base current are the most significant parameters in the PCGTAW process. The
results of the corrosion test revealed that heat affected zone is more susceptible to IGC. At the end, it has been observed
that the optimum value of peak current, base current and frequency based on regression analysis are 100 A, 50 A and 6 Hz
respectively.
