Fig. 1. Schematic of laser welding. (a) Schematic of scanning path and number; (b) Schematic of lap joint of steel/aluminum joint

Fig. 2. Shape of the weld seam with different spot welded joints. (a) Front side of the joint; (b) Back side of the joint

Fig. 3. Cross-section of welded joint. (a)-(g) Cross-section of welded joint 1^#-7^#

Fig. 4. Cross section of welded joint. (a) Weld fusion width; (b) Weld fusion depth

Fig. 5. Different welded joints fusion line area. (a)-(g) Metallographic organization of 1^#-7^# welded joint

Fig. 6. Different welded joints at the top of the weld. (a)-(g) Metallographic organisation of 1^#-7^# welded joint

Fig. 7. Different welded joints bottom. (a)-(g) Metallographic organisation of 1^#-7^# welded joint

Fig. 8. Microstructure of different welded joints. (a) Microstructure of 5^# welded joint; (b) Microstructure of 7^# welded joint

Fig. 9. Microstructure of 5^# and 7^#welded joints. (a), (d) Joint interface structure; (b), (e) Grain structure of the weld; (c), (f) Bottom joint of the joint

Fig. 10. Microhardness of welded joints on the steel side under different scanning paths

Fig. 11. Shear strength of steel/aluminum joints with different scan paths