Fig. 1. Narrow-gap wobble laser welding. (a) Welding diagram; (b) groove geometry; (c) experimental setup of narrow-gap wobble laser welding

Fig. 2. Schematics of samples for mechanical properties testing. (a) Welding test plate; (b) sampling diagram; (c) schematic of tensile sample; (d) schematic of bending sample; (e) schematic of impact sample

Fig. 3. Microstructures of base materials. (a) 35 steel; (b) Q355B steel

Fig. 4. Cross-section microstructure of 35 steel/ Q355B steel dissimilar joint, where images (a)(h) are enlarged views of zones AH

Fig. 5. Microstructures of heat-affected zone on 35 steel side of welded joint. (a) Microstructure of fusion line; (b) microstructure of the middle of heat-affected zone

Fig. 6. Microstructures of heat-affected zone on Q355B steel side of welded joint. (a) Microstructure of fusion line; (b) microstructure of the middle of heat-affected zone

Fig. 7. Bending sample diagram

Fig. 8. Scanning electron microscopy (SEM) images of impact fracture. (a) Upper layer of welded joint; (b) bottom layer of welded joint

Fig. 9. Hardness distribution of welded joint

Fig. 10. Welding of circular workpiece. (a) Experimental setup for narrow-gap wobble laser welding; (b) bottom layer of welded joint; (c) surface layer of welded joint