Study on microstructural and mechanical properties of dissimilar joint of laser beam welded Inconel 625 and SS 316

This paper investigates the microstructure and properties of deep penetrated laser welded dissimilar joints of Inconel 625 nickel based alloys and 316 Stainless Steel. Evaluation of weld microstructures through optical microscopy, Brinell Hardness test, Tensile test at room temperature and stress rupture properties were done. The Experimental results showed that the microstructure of the weld zone near the fusion line in Inconel 625 were columnar dendrites, whereas that near the fusion line in SS 316 were mainly cellular. The tensile strength tests indicated that the dissimilar butt joints ruptured in the fusion zone.