Friction Stir Lap Welding 0.8-mm-Thick 2024 Aluminum Alloy with the Assistance of Stationary Shoulder
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In this work, 0.8-mm-thick 2024 aluminum alloy was friction stir lap welded with the assistance of a stationary shoulder system. The joint surface formation, microstructure and mechanical properties of the welded joints were studied. The results showed that sound joints without defect could be obtained at a wide parameter range because stationary shoulder increased the material flow during welding. The stationary shoulder decreased the joint roughness from 125.5 to 58.9 µm. A thickness reduction of 4% was achieved at a welding speed of 200 mm/min. The joint fabricated by the stationary shoulder system had superior lap shear properties compared to the joint fabricated using the conventional tool. A high failure load of 7440 N was achieved at welding speed of 200 mm/min. The joint presented tensile fracture mode and the fracture morphology showed typical ductile fracture.
Keywordsfriction stir lap welding lap shear failure load sheet thickness reduction stationary shoulder
This project was supported by the National Science Foundation of China (No. 51705339).
Compliance with Ethical Standards
Conflict of interest
No potential conflict of interest was reported by the authors.
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