Dissimilar friction stir spot welding of AA2024-T3/AA7075-T6 aluminum alloys under different welding parameters and media |
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| Authors: | Gui-ju Zhang Cai-yuan Xiao Olatunj Oladimeji Ojo |
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| Affiliation: | Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing,Shaoyang,422000,Hunan,China;College of Mechanical and Energy Engineering,Shaoyang University,Shaoyang,422000,Hunan,China;Department of Industrial and Production Engineering,Federal University of Technology Akure,Akure.Nigeria |
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| Abstract: | This paper studies the friction stir spot welding of AA2024-T3/AA7075-T6 Al alloys in the ambient and underwater environments by clarifying the nugget features,microstructure,fracture and mechanical properties of the joints.The results show that the water-cooling medium exhibits a significant heat absorption capacity in the AA2024-T3/AA7075-T6 welded joint.Nugget features such as stir zone width,circular imprints,average grain sizes,and angular inter-material hooking are reduced by the water-cooling effect in the joints.Narrower whitish(intercalated structures)bands are formed in the under-water joints while Mg2Si and Al2CuMg precipitates are formed in the ambient and the underwater welded joints respectively.An increase in tool rotational speed(600-1400 rpm)and plunge depth(0.1-0.5 mm)increases the tensile-shear force of the welded AA2024-T3/AA7075-T6 joints in both the ambient and underwater environments.The maximum tensile-shear forces of 5900 N and 6700 N were obtained in the ambient and the underwater welds respectively. |
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| Keywords: | Friction stir spot welding Underwater friction stir spot welding Nugget characterization Microstructure Mechanical properties Fracture |
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