Fig. 1. Schematic of laser beam acting on workpiece

Fig. 2. Schematic of experimental setup. (a) Physical map; (b) lap way

Fig. 3. Schematic of shear tensile sample

Fig. 4. Morphology of Al/Mg weld. (a) Surface morphology; (b) cross-sectional morphology

Fig. 5. Laser absorptivity of 1050 aluminum alloy versus welding time[12]

Fig. 6. Penetrations depth of welds versus laser power density when laser spot area is constant

Fig. 7. Weld morphologies under different laser power densities when laser spot area is constant

Fig. 8. Penetration depth of welds versus laser power density when laser moving speed is constant

Fig. 9. Laser power density and laser spot energy versus laser spot diameter

Fig. 10. Penetration depth of welds versus laser duration and laser power density when laser spot area is constant

Fig. 11. Weld morphologies under different laser durations

Fig. 12. Penetration depth of welds versus nanosecond laser energy under different power densities