Fig. 1. Schematic diagram of hybrid welding

Fig. 2. Comparison of weld vertical section penetration

Fig. 3. Vertical section images of weld center by laser TIG hybrid welding at different laser powers. (a) 0.8 kW; (b) 1 kW; (c) 1.2 kW; (d) 1.4 kW; (e) 1.6 kW; (f) 1.8 kW; (g) 2 kW; (h) 2.2 kW; (i) 4 kW

Fig. 4. Variation of porosity with laser power

Fig. 5. Comparison of plasma with different arc shielding gas flow

Fig. 6. Pore distribution and weld surface morphology in weld under different arc shielding gas flows

Fig. 7. Variation of porosity with arc shielding gas flow

Fig. 8. Comparison of weld formation

Fig. 9. Influence of TIG current on weld width

Fig. 10. Variation of penetration with laser power at different TIG currents

Fig. 11. Relationship between metal vapor and back wall of keyhole