7075-T651 Al alloy was successfully lap-joined to AISI 304 stainless steel by friction stir lap welding (FSLW) employing four different tool rotational speeds (388, 535, 720, and 980 rpm).Crosssectional areas, tensile shear strength, and microhardness of the joints were investigated.When the rotational speed was increased, the hook size formed on the advancing sides of the joint increased, which caused the tensile shear strength of the joint to decrease.The joint made at 388 rpm had a tensile shear load of 9442 N while at 980 rpm possessed 4176 N.All the joints fractured from the top 7075-T651 base sheet as a tensile mode on the advancing side.Therefore, the joined areas are stronger.At low rotation speed, the joint broke vertically from the HAZ of the 7075-T651 sheet.Otherwise, it broke from the region next to the hook and along the hook direction.Intermetallic compounds caused hardness to increase.
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Ekinci et al. (2024) studied this question.
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