Effect of Ni-based Fillers on Corrosion Resistance of Heat Affected Zone of Super Austenitic Stainless Steel (UNS S31254) Welded by GTAW

The effect of Ni-based fillers on corrosion resistance welded super austenitic stainless steel (SASS) was examined. use for gas tungsten arc SASS leads to the formation fine Cr-Mo enriched phase in its weld unmixed zone, which makes it more susceptible localized corrosion. metallographic observations showed that pits were initiated around precipitated and they propagated along base metal. degree damage among samples using three types (Inconel 625, Inconel 622, Hastelloy 276) increased with Mo contents applied. higher fillers, size/number ratio concentration Mo, zone. Based results, is proposed high alloyed can have a great precipitation behavior causing deterioration welds. Therefore, content filler should be optimized similar metal so as not