Fig. 1. Schematic of 6061 aluminum alloy/DP980 high-strength steel laser-induced arc hybrid welding process

Fig. 2. Macroscopic morphologies of welds with Ni interlayer. (a) Aluminum alloy; (b) high-strength steel

Fig. 3. Effect of laser power on shear load of lap joint with Ni interlayer

Fig. 4. Cross-section morphology and local magnification of lap joint without Ni interlayer. (a) Cross-section morphology; (b) magnified image of A area in Fig. 4(a)

Fig. 5. Cross-section morphology and local magnification of lap joint with Ni interlayer. (a) Cross-section morphology; (b) magnified image of B area in Fig. 5(a)

Fig. 6. EPMA surface scan images of weld with Ni interlayer. (a) Al-element distribution; (b) Fe-element distribution; (c) Ni-element distribution

Fig. 7. XRD analysis results of lap-joint interface with Ni interlayer

Fig. 8. Typical fracture morphologies of lap joints with and without Ni interlayer. (a) Without Ni interlayer; (b) with Ni interlayer