Microstructure and Mechanical Properties of Combined GTAW and SMAW Dissimilar Welded Joints between Inconel 718 and 304L Austenitic Stainless Steel

A dissimilar welded joint of Inconel 718 and 304L austenitic stainless steel was prepared using a combined procedure with the gas tungsten arc welding shielded metal processes by employing Ni-based fillers: ERNiCr-3 ENiCrFe-3. The joints were investigated for metallographic testing mechanical properties, relationship established between microstructure resultant properties. Microstructural observation revealed formation unmixed zone on SS side. weld showed that fully consisted Nb- Ti-rich carbide phases along inter-dendritic spaces. tensile test results at room temperature failure from which might be due to alloying element segregation However, 600 °C base strength % elongation value 377 MPa 24%, respectively. hardness plot average 236 ± 5 HV, higher than BM (204 4 HV) but lower IN718 (243 HV). impact toughness 109 J, significantly metals. poor evolution NbC phase