Computational welding mechanics-based approach for the optimization of process parameters in laser welding of IN792 nickel-base alloy

Welding and repairing of nickel-base alloys and superalloys plays a crucial role in developing a new sustainability-based world. High power density welding is preferred to conventional arc welding because of its lower heat input that minimizes heat-induced alterations to the material. However, when dealing with nickel-base alloys, the challenge is to obtain a sound joint while avoiding the formation of solidification cracks. The present work is aimed at summarizing the preliminary results of a numerical study about the effects of laser welding parameters on thermal and mechanical fields of IN792 butt-welded joints. The effects of preheating temperature, heat input and welding speed on thermal and residual stress were investigated. Finally, some melt-run trials were carried out and the structural integrity of the obtained samples was discussed based on the numerical results.