Numerical Model of Multi-pass Repair Process by Temper Bead Welding

In this study, a numerical model coupling weld bead formation and thermal conduction was developed for more accurate simulation of the temperature distribution during temper bead welding. Most of the welding parameters used in the analysis were estimated from experimental welding conditions based on experiments and numerical simulations of previous research works. The simulation results were compared with the experimental results under the same welding conditions to confirm the usefulness of the developed numerical model. Except for the weld penetration shape, the analytical results of the bead surface shape and the temperature distribution, such as the Ac1 lines, were in good agreement with the experimental results. The developed model has the potential to be effective and more precise in predicting and evaluating properties such as the metallographic structure and the hardness of the HAZ and the resulting weld residual stress by temper bead welding with the appropriate computational cost.