Abstract
TIG-MIG hybrid welding process has a possibility as a new type of welding process with high quality and high efficiency. However, the mechanism of this process is not clear due to complex interaction of TIG arc and MIG arc. In this study, the calculation of arc phenomena in TIG-MIG hybrid welding process was performed by using three-dimensional numerical model, in which torch angle was changed. Consequently, it was found that the expansion of high temperature plasma between the electrodes and the current between the electrodes increased with torch angle, and the balance determined by the stiffness and repulsion of both arc was important for the convergence of heat flux. It was also found that TIG-MIG hybrid welding process had the possibility to optimize the plasma property and the heat source property by adjusting TIG and MIG torch angles.
