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On the double-side probeless friction stir spot welding of AA2198 Al-Li alloy |
Q. Chua, W.Y. Lia?( ), H.L. Houb, X.W. Yanga, A. Vairisac, C. Wangb, W.B. Wangb |
a State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an,710072, China; b Beijing Aeronautical Manufacturing Technology Research Institute, Beijing, 100024, China c Mechanical Engineering Department, TEI of Crete, Heraklion, Crete, 71004, Greece |
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Abstract Double-side probeless friction stir spot welding (DP-FSSW) of AA2198 alloy was conducted to investigate the microstructure and mechanical properties. Compared with common single-side probeless friction stir spot welding (P-FSSW), the plastic strain during DP-FSSW is nearly symmetrical with respect to the bondline to suppress the extension of hook defect, which is detrimental to the joint mechanical strength. With DP-FSSW, a fully metallurgically bonded region has formed due to severe plastic deformation at high temperatures. Tensile/shear tests show that the joint strength could exceed 8kN, which is comparable to P-FSSW and refill FSSW, and all fractures happen in a shear failure mode as cracks extend along the interface of two sheets. The microhardness profile exhibits a uniform distribution along the thickness direction, in which the hook defect shows the lowest value.
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Received: 25 March 2018
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Corresponding Authors:
Li W.Y.
E-mail: liwy@nwpu.edu.cn
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About author: 1 These authors contribute equally to this paper. |
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