Xi Wu, Peilei Zhang, Man Tang, Mingchuan Li, Zhishui Yu, Shaowei Li. Formation and Microstructure Characteristics in Spot Welding of Dissimilar Cu-Al Foil by Nanosecond Laser Scanning[J]. Chinese Journal of Lasers, 2019, 46(4): 0402006
- Chinese Journal of Lasers
- Vol. 46, Issue 4, 0402006 (2019)
Fig. 1. Designed laser scanning path. (a) Spiral scanning structure; (b) schematic of weld formation
Fig. 2. Tensile-shear samples under different overlapping combination modes. (a) Cu/Al; (b) Al/Cu
Fig. 3. Surface morphologies and cross sections of welds formed under different overlapping combination modes
Fig. 4. Surface stereo formation images under different overlapping combination modes. (a) Cu/Al; (b) Al/Cu
Fig. 5. Schematics of different laser welding processes. (a) Continuous laser; (b) nanosecond laser
Fig. 6. Test results of interfaces on Al side and Cu side for overlapping combination mode of Cu/Al. (a) SEM image of interface on Al side; (b) EDS mapping on Al side; (c) SEM image on Cu side; (d) EDS mapping on Cu side
Fig. 7. Defects of joints for overlapping combination mode of Al/Cu
Fig. 8. Morphology of joint for overlapping combination mode of Al/Cu. (a) Overall morphology; (b) region on Al side; (c) interface between Al and Cu; (d) microstructure of region Ⅰ; (e) microstructure of region Ⅱ; (f) enlarged image of interface between Al and Cu; (g) EDS image of typical region
Fig. 9. XRD test results of Al/Cu weld region. (a) Cu side; (b) Al side
Fig. 10. Cu-Al binary phase diagram and phase distribution within joint
Fig. 11. Morphology of joint for overlapping combination mode of Cu/Al. (a) Overall morphology; (b) region on Al side; (c) interface between Al and Cu; (d) region on Cu side; (e) EDS image of typical region
Fig. 12. Tensile-shear test results of substrates and joints under different overlapping combination modes
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Table 1. Parameters for nanosecond laser welding
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Table 2. EDS analysis results of points in Fig. 8
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