Fig. 1. Schematic of welding device with alternating magnetic field

Fig. 2. Size of tensile and shear specimen

Fig. 3. Element distribution of welded joint without alternating magnetic field. (a) Overall morphology of weld zone; (b) Mg element distribution; (c) Fe element distribution; (d) Ni element distribution; (e) Al element distribution; (f) O element distribution

Fig. 4. Element distribution of welded joint with alternating magnetic field. (a) Overall morphology of weld zone; (b) Mg element distribution; (c) Fe element distribution; (d) Ni element distribution; (e) Al element distribution; (f) O element distribution

Fig. 5. SEM images at different positions of welded joint without alternating magnetic field. (a) Cross-section of welded joint; (b) amplified image of region 1; (c) amplified image of region 2; (d) amplified image of region 3; (e) amplified image of region 4

Fig. 6. SEM images at different positions of welded joint with alternating magnetic field. (a) Cross-section; (b) amplified image of region 1; (c) amplified image of region 2; (d) amplified image of region 3; (e) amplified image of region 6; (f) amplified image of region 4; (g) amplified image of region 5

Fig. 7. Welded joint sample and schematic diagram after tensile and shear fracture. (a) Welded joint of laser brazing lap joint after tensile and shear fracture; (b) actual width of the connection

Fig. 8. Effects of excitation current and frequency on tensile and shear strength of welded joint. (a) Influence of excitation current; (b) influence of excitation frequency

Table 1. EDS analysis of Mg/steel welded joint at different positions when alternating magnetic field is not applied

Table 2. EDS analysis of Mg/steel welded joint at different positions when alternating magnetic field is applied