Residual stresses in gas tungsten arc welding: a novel phase-field thermo-elastoplasticity modeling and parameter treatment framework

Abstract The fusion welding process of metallic components, such as using gas tungsten arc (GTAW), is often accompanied by detrimental deformations and residual stresses, which affect the strength functionality these components. In this work, a phase-field model, usually used to track states phase-change materials, embedded in thermo-elastoplastic finite element model simulate GTAW estimate stresses. This embedment allows moving melting front material induced heat source and, thus, splits domain into soft hard solid regions with diffusive interface between them. Additionally, temperature- phase-field-dependent properties are considered. J2 plasticity isotropic hardening coupled system equations solved FE package FEniCS, whereas two- three-dimensional initial-boundary-value problems introduced results compared reference data from literature.