Numerical analysis of the residual stress state and distortions generated by autogenous welding and shielded metal arc welding (SMAW)

Abstract

The present paper investigates, numerically, two welding techniques, by comparing the residual stresses introduced by each welding process. The first part of the paper proposes numerical modeling of the welding process by using APDL language (Ansys Parametric DesignLanguage) to integrate the Birth and Death Technique to take into account the effect of the filler metal deposition. The numerical model developed takes into account the difference between the mechanical behavior of the filler and base metal in order to increase the precision of the results. Also, the effect of temperature on the thermal and mechanical properties will be considered. The shielded metal arc welding and autogenous welding will be modeled and residual stresses will be calculated for each welding process. The results obtained show that the autogenous weld does not have a significant influence on the maximum residual stresses reached, however, the areas subjected to high levels of stress remain limited in the autogenous welds.