Abstract
ABSTRACT Dissimilar welding potentially has great importance for many industries. Joining of two different alloys is very challenging. In this paper, an attempt was made to produce a reliable joint between Nickel-based superalloy with stainless steel using the gas tungsten arc welding process with nickel-based filler wire. Post-weld heat treatment was executed at 700°C for 2 h. A critical comparison was made between the post-weld heat-treated samples and as-welded samples. The tensile test indicates that the strength of the joint is higher than the weaker base metal (Stainless Steel). The macrostructure and microstructure show proper fusion and bonding among the parent metals and filler wire. There is a formation of the partially melted zone at fusion boundary and secondary phase (Niobium-rich phase) at a region adjacent to the fusion boundary on heat-affected zone of Inconel side. It was also observed that the post-weld heat-treated samples have a significant reduction in the secondary phase. Vickers’ microhardness value indicates that the secondary phase has a higher value of hardness both in as-weld condition and post-weld heat treatment condition. Thus, Nickel-based filler wire is a compatible filler wire for the dissimilar joint.
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