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J. Mater. Sci. Technol.  2019, Vol. 35 Issue (5): 784-789    DOI: 10.1016/j.jmst.2018.10.027
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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.

Key words:  Friction stir welding      Double-side      Al-Li alloy      Microstructure      Mechanical property     
Received:  25 March 2018     
Corresponding Authors:  Li W.Y.     E-mail:  liwy@nwpu.edu.cn
About author: 

1 These authors contribute equally to this paper.

Cite this article: 

Q. Chu, W.Y. Li, H.L. Hou, X.W. Yang, A. Vairis, C. Wang, W.B. Wang. On the double-side probeless friction stir spot welding of AA2198 Al-Li alloy. J. Mater. Sci. Technol., 2019, 35(5): 784-789.

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https://www.jmst.org/EN/10.1016/j.jmst.2018.10.027     OR     https://www.jmst.org/EN/Y2019/V35/I5/784

Fig. 1  (a) Macrostructure, distributions of (b) temperature (TEMP), (c) plastic strain (PE) of a typical P-FSSWed joint and (d) plastic strain (PE) distribution of a DP-FSSWed joint.
Fig. 2  (a) DP-FSSW process and (b) geometry of the specimen.
Material A B C m n Tr (°C) Tm (°C)
2198 510 200 0.02 1.61 0.45 25 502
Table 1  Constants for Johnson-Cook material model.
Fig. 3  Optical macrographs of cross-section of DP-FSSWed joint for 950?rpm/15?s: (a) full view, (b) SZ (region B), (c) TMAZ (region C), (d) HAZ (region D), (e) region E and (f) region F.
Fig. 4  Microhardness distribution in the cross-section of DP-FSSWed joint for 950?rpm/15?s.
Fig. 5  Mechanical strength of DP-FSSWed joints.
Fig. 6  Fractographs of DP-FSSWed joints: (a) 950?rpm/15?s and (b) 1500?rpm/9?s, and fractographs of P-FSSWed joints: (c) 950?rpm/6?s and (d) 950?rpm/15?s.
Fig. 7  Magnified micrographs of regions A-F in Fig. 6: (a) region A, (b) region B, (c) region C, (d) region D, (e) region E, and (f) region F.
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