Fig. 1. Welding and tensile test schematics. (a) Welding schematic; (b) tensile test schematic

Fig. 2. Comparison of TIG and laser-TIG hybrid welded joints cross-sections. (a) S1; (b) S3; (c) S5; (d) S6; (e) S8; (f) S10

Fig. 3. Schematic of laser-TIG hybrid welded joint

Fig. 4. Joint size change under different welding currents. (a) Contact angle; (b) spread length; (c) brazing zone length

Fig. 5. Microstructures of laser-TIG hybrid welded joint. (a) Base material (BM); (b) fusion welding zone; (c) coarse-grain zone; (d) fine-grain zone; (e) intercritical heat-affected zone (HAZ); (f) subcritical HAZ

Fig. 6. Macroscopic view and regional magnification views of S10 weld captured by scanning electron microscopy (SEM). (a) Macro picture of the weld; (b) brazing zone; (c) enlarged view of the upper interface of the brazing zone; (d) enlarge view of fusion welding zone; (e) enlarged view of fusion welding zone interface

Fig. 7. Schematics of laser-TIG hybrid welded joint formation. (a) During the welding process; (b) welding completion

Fig. 8. Hardness distribution curves across the welded joint. (a) Lower sheet; (b) upper sheet

Fig. 9. Tensile shear test results

Fig. 10. Fracture location and path diagrams