Mahmoud Moradi - Department of Mechanical Engineering, Faculty of Engineering, Malayer University, Malayer, Iran
Majid Ghoreishi - Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran
Azam Rahmani - Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran

In this paper, a three-dimensional finite element model has been developed to simulate the laser-TIG hybrid welding (HLAW) of stainless steel 1.4418 with thickness of 4 mm. Transient temperature profile and dimensions of the fusion zone and heat affected zone (HAZ) during welding process are calculatedusing finite element method (FEM) and were solved in the ABAQUS/Standard software.The heat source model is a combination of Goldak distribution for the arc heat flux, a body Gaussian distribution for laser heat flux and a surface heat flux model. The DFLUX subroutine was used for implementation of the movable welding heat sources of the models.To validate the model, several HLAWexperiments were performed with a pulsed Nd:YAG laser and TIGsources. Good agreement between the simulated and the experimental measurements revealed that the model would be appropriate forHLAWnumericalsimulation. Among the material properties, the material conductivity is the most important term which influences on the weld bed dimensions.

Laser-TIG Hybrid Welding, Temperature Field, FEM-Simulation- Nd:YAG Laser, Heat Source Model