An empirical research on dissimilar metal weld of sa335 p11and sa312 tp304 formed by metal inert gas (Mig) welding

Abstract

Development of dissimilar metal welds (DMW) presents itself as an important research domain with respect to the industrial requirements. The joints formed by dissimilar metals should have superior metallurgical properties and an ability to withstand severe operational conditions. Due to difference in composition and properties, DMW formed between stainless steel and low carbon alloy exhibits functional limitation under heterogeneous working conditions and leads to components failure. The present empirical study investigates mechanical and metallurgical properties of dissimilar metal weld of SA312 TP304 alloy and SA335 P11 stainless steel that is formed by MIG welding. The mechanical and metallurgical properties of the weld are investigated using tensile test, hardness measurement and microstructural observations. Characterization of as-welded and heat-treated weld specimen has also been conducted to determine effect of heat treatment on material behavior. The lower tensile strengths was measured in MIG welded joints than base metals. The significant decrease in ultimate strength is observed in heat treatment specimens compared to as-welded specimens. In contrary, all regions of treated joints revealed higher hardness than the as-welded joint.