Numerical analysis of energy effect in laser-TIG hybrid welding

The hybrid source that combined CO2 laser, with TIG arc to proceed welding was analyzed. Based on an energy model, the temperature field and weld shape were calculated numerically. The heat transfer characteristic of the hybrid heat source to workpiece and its effect to weld shape were also analyzed. Through analyzing the enhancement effect of the hybrid heat source, the absorption effect and defocusing effect of the hybrid arc to laser were calculated, and the regularity of the energy density to the current was obtained subsequently. At last, the critical energy matches to induce the enhancement effect of CO2 laser-TIG arc hybrid welding were obtained.