Baohua Zhu, Sicheng Niu, Qige Li, Shuming Zhao, Xing Lu, Caiwang Tan, Xiaoguo Song. Microstructures and Properties of Nanosecond Laser Welded Cu/Al/Cu Joints Under Different Welding Speeds[J]. Chinese Journal of Lasers, 2023, 50(20): 2002102
- Chinese Journal of Lasers
- Vol. 50, Issue 20, 2002102 (2023)
Fig. 1. Schematics of Cu/Al/Cu sheet structure welding . (a) Welding fixing device; (b) laser scanning path
Fig. 2. Tensile shear diagrams of Cu/Al/Cu laminar sheet joint. (a) Lap diagram of joint; (b) schematic of shear force test
Fig. 3. Surface morphologies of Cu/Al/Cu laminar sheet joints under different welding speeds. (a)-(e) Optical mirror morphologies; (b)-(j) optical 3D structures; (k)-(o) SEM morphologies
Fig. 4. Cross-section morphologies of Cu/Al/Cu laminar joints under different welding speeds. (a)(f) 15 mm·s-1; (b)(g) 18 mm·s-1; (c)(h) 21 mm·s-1; (d)(i) 24 mm·s-1; (e)(j) 27 mm·s-1
Fig. 5. Weld geometry characteristics of Cu/Al/Cu laminar structures. (a) Schematic of weld structure; (b) weld reinforcement and penetration depth
Fig. 6. Interfacial microstructures of typical Cu/Al/Cu laminar joints under different welding speeds. (a)-(c) 15 mm·s-1; (d)-(f) 21 mm·s-1; (g)-(i) 27 mm·s-1
Fig. 7. Line scanning results of positions marked by arrows in Fig.6 under different welding speeds. (a)(b) 15 mm·s-1; (c)(d) 21 mm·s-1; (e)(f) 27 mm·s-1
Fig. 8. Interfacial element distributions of Cu/Al/Cu laminar joints under different welding speeds. (a)-(d) 15 mm·s-1; (e)-(h) 21 mm·s-1; (i)-(l) 27 mm·s-1
Fig. 9. Shear force test results of Cu/Al/Cu laminar joints under different welding speeds
Fig. 10. Fracture surface morphologies of typical Cu/Al/Cu laminar sheet joints under different welding speeds. (a)-(c) Optical mirror morphologies; (d)-(f) 3D features for Al-side fractures; (g)-(i) 3D features for Cu-side fractures
Fig. 11. SEM fracture surface morphologies of typical Cu/Al/Cu laminar sheet joints under different welding speeds. (a)(d) 15 mm·s-1;(b)(e) 21 mm·s-1; (c)(f) 27 mm·s-1
Fig. 12. Failure mechanism diagrams of Cu/Al/Cu nanosecond pulsed laser welded joints under different welding speeds. (a) 15 mm/s;(b) 21 mm/s; (c) 27 mm/s
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Table 1. Chemical compositions of 6063 Al alloy and T2 Cu (mass fraction, %)
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Table 2. Parameters for nanosecond pulsed laser welding of Cu/Al/Cu
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Table 3. EDS results of marked points in Fig. 6
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Table 4. EDS results of marked regions in Fig. 11
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