Abstract
Abstract Refill friction stir spot welding (RFSSW) was used to join 6061-T6 and 7075-T6 aluminum alloys in this work. Different sheet configurations and welding parameters were used to optimize joint strength. The effect of sleeve plunge depth on the microstructure and mechanical properties of the joints were investigated. The results showed that no defects were obtained when 6061-T6 aluminum alloy was placed as the upper sheet. The lap shear failure load of the joint using 6061-T6 aluminum alloy as the upper sheet was higher than that using 7075-T6 as the upper sheet. The maximum failure load of 12,892 N was attained when using the sleeve plunge depth of 3.6 mm. The joint failed at the upward flowing 7075 near the hook.
Highlights
In the twenty-first century, the global energy crisis causes light-weight materials to be extensively used in automobile industries [1, 2]
The results showed that no defects were obtained when 6061-T6 aluminum alloy was placed as the upper sheet
The tool used in Refill friction stir spot welding (RFSSW) is more complicated, which consists of a clamping ring, whose main function is to keep the plates tightly and avoid plastic material from escaping, and a pin and a sleeve, which are the main components to stir the material
Summary
In the twenty-first century, the global energy crisis causes light-weight materials to be extensively used in automobile industries [1, 2]. Abstract: Refill friction stir spot welding (RFSSW) was used to join 6061-T6 and 7075-T6 aluminum alloys in this work. The effect of sleeve plunge depth on the microstructure and mechanical properties of the joints were investigated.
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