This post demonstrates an advanced welding simulation in Abaqus utilizing a custom DFLUX subroutine for modeling the heat flux during the welding process. The heat source is represented by a Gaussian distribution that accounts for both the front and rear regions of the welding heat source. This approach simulates the thermal effect on the material as the welding torch moves across the surface. The attached .zip file contains the DFLUX Fortran subroutine, the INP file