Fig. 1. Schematic diagram of laser-CMT hybrid welding

Fig. 2. Grain morphologies of the welds with different thicknesses of Ti foil and statistical results of grain size. (a) 0 μm; (b) 25 μm; (c) 40 μm; (d) 80 μm; (e) statistical results of weld center grain size

Fig. 3. Metallographic images of the welds with different thicknesses of Ti foil. (a) 0 μm; (b) 25 μm; (c) 40 μm; (d) 80 μm; (e) volume fraction of gray-irregular precipitates

Fig. 4. Microstructure of the weld seam with different thicknesses of Ti foil. (a) 0 μm; (b) 80 μm; (c) weld XRD analysis results

Fig. 5. Effect of Ti on weld solidification behavior. (a) Al-2.25%Si-0.63%Mg-0.11%Fe-0.3%Ti solid precipitation mass fraction with temperature change; (b) effect of Ti mass fraction on TiAl₃ precipitation temperature

Fig. 6. Mechanical properties of the welded joints with different thicknesses of Ti foil. (a) Average microhardness of the weld seam; (b) average tensile strength of the welded joints

Fig. 7. Fracture morphology of the welded joints with different thicknesses of Ti foil. (a) 0 μm; (b) 25 μm; (c) 40 μm; (d)(e) 80 μm

Fig. 8. Micro morphology of the fracture surface with different thicknesses of Ti foil. (a) 0 μm; (b) 80 μm