Fig. 1. Microstructure of base metal

Fig. 2. Schematics of laser welding. (a) Schematic of laser beam oscillating welding; (b) track map of spot oscillating

Fig. 3. Schematics of mechanical property test samples. (a) Tensile sample; (b) impact sample

Fig. 4. Surface morphology of different welded joints. (a) Linear welded joint; (b) oscillating welded joint

Fig. 5. Cross-section morphology of different welded joints. (a) Linear welded joint; (b) oscillating welded joint

Fig. 6. Microstructures of different welded joints

Fig. 7. Microhardness profile of different welded joints. (a) Linear welded joint; (b) oscillating welded joint

Fig. 8. Macroscopic morphology of different tensile samples after fracture. (a) Base material; (b) linear welded joint; (c) oscillating welded joint

Fig. 9. Engineering stress-strain curves of different tensile samples

Fig. 10. Macroscopic morphology and microscopic morphology of tensile fracture of base material and welded joints

Fig. 11. Microscopic morphology of impact fracture of base material and welded joints. (a) Base material; (b) linear welded joint; (c) oscillating welded joint