Microstructure Investigation, Hot Tensile and Hot Corrosion of IN600 to Nimonic 75 heterogeneous Connection in Spot Welding

Nimonic 75 and Inconel 600 alloys are the Nickel-based superalloys which used in manufacturing gas turbine components. In current research, a superalloy Ni-based sheet were used, joint by resistant spot welded (RSW) machine at currents of 2, 4, 6 kA, pressure 5 7 bar, times 0.6, 0.9 1.2. Non- destructive inception methods light scanning electron method (SEM) optic microscope (LOM) to evaluate joints' quality. Shear micro-hardness test was check mechanical properties joint. The findings indicate that most appropriate welding connection inhomogeneous points 4 kA holding time second electrode force 7bar. analysis microstructure consisted 3 zones affected heat base metal. warm corrosion results °C 800 hours confirmed existence chromium oxide layer on surface superalloy, has main role protecting piece output temperature.