OBRABOTKAMETALLOV Vol. 26 No. 2 2024 technology Fig. 8. Fracture behavior of the shot-peened UVaFSWed AA7075 joints peened UVaFSWed joint that was obtained during Run P9. The large and shallow dimples in the shot-peened UVaFSWed test specimen show higher plastic deformation. The dimple sizes impact the sustainability of plastic deformation during tensile testing. The dimples observed on the shot-peened UVaFSWed specimen are larger and more equiaxed than that of the fractured conventional FSWed test specimen [22–25]. Hence, the UTS and microhardness in different weld regions are superior for shot-peened UVaFSWed joints compared to the conventional FSWed joint. Researchers have observed different fracture patterns in shot-peened UVaFSWed joints. The reason for this is due to the heat generated during the process. The dual effect of ultrasonic vibration and frictional heat produced by the tool shoulder results in the release of more heat during UVaFSW. The higher the heat Fig. 9. SEM images of the fracture surface of shot-peened UVaFSWed joint of AA7075
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