Fig. 1. Process parameters of laser welding

Fig. 2. Dimensions of tensile test specimen

Fig. 3. Macroscopic morphologies of welded joints at different laser offsets. (a) NiTi 100; (b) NiTi 50; (c) centerline; (d) Cu 50;(e) Cu 100

Fig. 4. Cross-section morphologies of laser welds at different laser offsets. (a) NiTi 50; (b) centerline; (c) Cu 50; (d) Cu 100

Fig. 5. Weld dimensions at different laser offsets

Fig. 6. Typical microstructure of welds at different laser offsets. (a) NiTi 50 [A-region of Fig. 3 (a)]; (b) centerline [B-region of Fig. 3(b)]; (c) Cu 50 [C-region of Fig. 3(c)]; (d) Cu 100[D-region of Fig. 3(d)]

Fig. 7. Element distribution curves of welds at different offsets. (a) NiTi 50; (b) centerline; (c) Cu 50; (d) Cu 100

Fig. 8. Hardness distribution curves of welds at different offset. (a) NiTi 50; (b) centerline; (c) Cu 50; (d) Cu 100

Fig. 9. Fracture morphology of Cu 100 welded joint. (a) Fracture morphology; (b) enlargement of local areas of Fig. (a)