The experimental study of CFRP interlayer of dissimilar joint AA7075-T651/Ti-6Al-4V alloys by friction stir spot welding on mechanical and microstructural properties

Abstract The present study focused on two dissimilar metal alloys: AA7075-T651 and Ti-6Al-4V alloys with additional carbon fiber-reinforced polymer (CFRP) as an interlayer were welded together by friction stir spot welding (FSSW). effect of parameters (rotational speed dwell time) mechanical microstructural properties a weld joint was investigated. obtained results explore the parametric effects joint. maximum tensile shear load 2597.8 N achieved at rotational 2,000 rpm time 10 s. While same speed, 54.7% reduction in attained shorter 5 Therefore, plays important role scanning electron microscope (SEM-EDS) show formation intermetallic compound Ti 3 Al Ti-Al-C that significantly affect Moreover, micro-hardness found significant than time. increase 18.90% keyhole rather zone thermomechanical affected zone, which might be due to presence ternary (Ti-Al-C) compound.