1：Experimental Design and Method Selection:

Laser welding-brazing was performed using a coaxial powder feeding system to deposit layers of Al–10Si–Mg powder, with the number of layers varied (1, 5, 7, 10) to study their effects on joint quality. The method was chosen to control interfacial reactions and improve homogeneity of the IMC layer.

2：Sample Selection and Data Sources:

Base materials were 6061-T6 Al and Ti-6Al-4V alloys with dimensions of 100 mm × 45 mm × 2 mm. Spherical Al–10Si–Mg powders (45–100 μm diameter) were used as filler. Samples were prepared with grooves and cleaned to remove contaminants.

3：List of Experimental Equipment and Materials:

Equipment included a 5.0 kW fiber laser (IPG YLR-5000), coaxial powder nozzle (Fraunhofer ILT), dual GTV powder feeder, argon chamber, optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), focused ion beam (FIB), transmission electron microscopy (TEM), and tensile testing machine (AG-X Plus). Materials included Nocolok flux (KAlF4 and K3AlF6 eutectic), acetone, NaOH, HNO3, HF, and Keller's reagent.

4：0 kW fiber laser (IPG YLR-5000), coaxial powder nozzle (Fraunhofer ILT), dual GTV powder feeder, argon chamber, optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), focused ion beam (FIB), transmission electron microscopy (TEM), and tensile testing machine (AG-X Plus). Materials included Nocolok flux (KAlF4 and K3AlF6 eutectic), acetone, NaOH, HNO3, HF, and Keller's reagent. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: Grooves were fabricated on Ti and Al sides, surfaces were cleaned, flux was applied, and welding was performed in an argon atmosphere with specific laser power, scanning speed, powder feeding rate, and number of deposition layers as per Table 3. Cross-sections were prepared, polished, etched, and analyzed using OM, SEM, EDS, FIB, and TEM. Tensile tests were conducted at room temperature with a loading rate of 1 mm/min.

5：Cross-sections were prepared, polished, etched, and analyzed using OM, SEM, EDS, FIB, and TEM. Tensile tests were conducted at room temperature with a loading rate of 1 mm/min. Data Analysis Methods:

5. Data Analysis Methods: Microstructure and chemical compositions were analyzed using SEM and EDS. IMC thickness was measured with Image-pro software. Tensile strength and fracture behavior were evaluated, and statistical analysis involved testing three samples per condition for accuracy.