Numerical analysis of temperature profile and weld dimension in laser+pulsed gas metal arc welding hybrid welding

Increasing the number of process parameters allows a flexible adjustment of the laser+pulsed gas metal arc welding (GMAW) hybrid welding process; however, it places higher demands on the technology development and the process optimization. It is therefore important to conduct fundamental investigations involving mathematical modelling to understanding the hybrid welding process. In this study, thermal action characteristics in laser+pulsed GMAW hybrid welding are considered from the viewpoint of macro heat transfer, and two kinds of adaptive combined volumetric heat source models are developed for numerical analysis of heat flow in the hybrid welding. Based on the appropriate description of heat input from a laser beam, pulsed GMAW and heat content of overheated droplets, the adaptive heat source models are developed for laser+pulsed GMAW hybrid welding through combining three contributions to the heat density, i.e. double elliptic planar distribution of arc heat for both peak and background durations, un...