Abstract
TIG-MIG hybrid welding produces better weld formation than traditional MIG welding at higher welding speeds. The adaptive heat source and arc pressure models of inclined TIG-MIG arcs on curved surface were improved based on their distribution on flat surface. A 3D transient model of heat and mass transfer in a weld pool was established to analyze the influences of various welding parameters on a high-speed TIG-MIG hybrid welding process. The influence of the TIG current, distance between electrodes, and welding speed on this hybrid welding process were simulated to study the quantitative relationships between process parameters, molten pool behavior, and weld beam formation. The heat flux field, temperature field, and fluid flow on the upper surface and longitudinal sections of the weld pool were simulated and analyzed under various welding conditions. Experiments were performed; the simulation results agreed well with the experiments.
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