Effect of rotational speed on temperature distribution in rotary friction welded Inconel 718/ AISI 410 dissimilar joints

Inconel 718 to AISI 410 martensitic stainless steel (MSS) welded joints are extensively used in various industries such as nuclear industry, chemical industry and aerospace industry. Because Inconel 718 and AIS1410 martensitic stainless steel are having high corrosion resistance and high temperature strength compared to other materials. These joints are presently made by laser beam welding (lBW) and electron beam welding (EBW) processes. In this investigation, Inconel 718 and 410 grade MSS rods were joined by using friction welding process by varying rotational speeds. Temperature distribution was measured during welding at different location of joint using thermo-couples and labview software. Tensile properties of the welded dissimilar joints at room temperature were evaluated. Microhardness survey was conducted across the joint at various locations using Vicker hardness testing machine. Microstructural features were recorded using optical microscopy (OM), scanning electron microscopy (SEM) these microstructural feature were correlated with the measured temperatures at various regions. The reasons for failure at the particular region was identified and reported in this paper