Abstract
This research article reports the effect of filler metals on the weldability, microstructure, tensile strength, and impact toughness of bimetallic joints involving ferritic stainless steel (AISI 430) and super-austenitic stainless steel (AISI 904L). These dissimilar combinations were obtained using continuous current (CC) and pulsed current (PC) gas tungsten arc-welding (GTAW) processes, employing duplex stainless steel (ER2553) and Inconel 625 (ERNiCrMo-3) fillers. Microstructure studies revealed the presence of grain boundary martensite and a slight grain coarsening effect in the HAZ of AISI 430 for all the cases. The study also inferred that both CCGTA and PCGTA welding employing these fillers resulted in better joint strength by observing failure at the parent metal of AISI 430 in all the trials. Impact toughness was found to be better for the PCGTA weldments employing ERNiCrMo-3 filler due to the refinement of grains. The impact studies showed that the root pass corroborated higher toughness values than the cap zone for all the cases. Based on the structure–property relationships, this study recommends the use of PCGTA employing ERNiCrMo-3 for joining AISI 430 and AISI 904L.
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