Study on Numerical Simulation of Butt-Welded Heavy Thickness Plate of Steel in PAW-GMAW Hybrid Welding Process with Modified Heat Source Model

In recent years, one of the versions of the PAW-GMAW hybrid welding process is basically a combination of a PAW arc with a GMAW arc where the GMAW arc is emitted from the side-posited tungsten toward the nozzle orifice, the consumable wire fed along the torch axis through the orifice. Based on the configuration feature of PAW-GMAW hybrid welds, a combined heat source model as a hybrid heat source model is proposed for the numerical analysis of temperature fields in the PAW-GMAW hybrid welding process. It accounts for the volumetric distribution characteristics of plasma heat intensity along the direction of the workpiece thickness. The results show that the predicted geometry and locus of the fusion line in the PAW-GMAW hybrid weld cross-section are in good agreement with the experimental measurements. It lays a thermal stress–strain simulation of the keyhole PAW-GMAW hybrid welding process.