On the double-side probeless friction stir spot welding of AA2198 Al-Li alloy

doi:10.1016/j.jmst.2018.10.027

Abstract

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

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]. J. Mater. Sci. Technol., 2019, 35(5): 784-789.

Figures/Tables 8

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.

Table 1 Constants for Johnson-Cook material model.

Material	A	B	C	m	n	T_r (°C)	T_m (°C)
2198	510	200	0.02	1.61	0.45	25	502

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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