Fig. 1. Metallographic morphology of 6082-T6 aluminum alloy

Fig. 2. Macroscopic morphologies of welding joints under different process parameters. (a) v=0.72 m·min-1, P=3000 W; (b) v=1.5 m·min-1, P=3250 W; (c) v=2.1 m·min-1, P=3750 W; (d) v=2.7 m·min-1, P=4250 W

Fig. 3. Morphologies of welding joints. (a) P=3000 W, v=0.72 m·min-1, HAZ; (b) P=4250 W, v=2.7 m·min-1, HAZ; (c) BM

Fig. 4. Micro-hardness of welding joints under different process parameters. (a) P=3000 W, v=0.72 m·min-1; (b) P=4250 W, v=2.7 m·min-1

Fig. 5. Stress-strain curves of welding joints under different process parameters. (a) P=3000 W, v=0.72 m·min-1; (b) P=4250 W, v=2.7 m·min-1

Fig. 6. DSC curve of 6082 Al alloy at heating rate of 10 K·min-1

Fig. 7. DSC curve of 6082 Al alloy at heating rate of 20 K·min-1

Fig. 8. Welding thermal cycle curves under different process parameters. (a) P=3000 W, v=0.72 m·min-1; (b) P=4250 W, v=2.7 m·min-1

Fig. 9. Morphology of BM. (a) High-resolution TEM; (b) diffraction pattern

Fig. 10. Morphology of softening area of welding joint. (a) High-resolution TEM; (b) diffraction pattern