Optimized parameter of dissimilar joining between Al6061-T6 and height-strength steel with friction stir spot welding process (FSSW)

High-strength steel and aluminum alloys are used to manufacture modern vehicles. The objective was reduce the weight fuel consumption of In this study optimum parameters for friction stir spot welding (FSSW) process between Al6061-T6 alloy HSS590 high-strength were determined. Response surface methodology based on central composite design (CCD) with three parameters, five levels, 19 runs conduct experiments develop mathematical regression models. joint tool speed, feed, dwell time. Analysis variance then performed examine adequacy developed Finally, effects mechanical properties investigated using addition, distribution chemical composition fracture characteristics joints examined scanning electron microscopy (SEM). investigation found that a speed 1576 rpm, feed rate 45 mm∙min-1, time 10 s. Furthermore, results confirmed models consistent.