ICONE19-43939 Phenomenological evaluation of laser-irradiated welding processes with a combined use of higher-accuracy experiments and computational science methodologies : (5) Numerical simulation of the welding processes with a multi-dimensional multi-physics analysis code SPLICE

Abstract

It is quite important that the establishing the welding and solidification processes, generation of the residual stress, in a laser welding for various reactor components. In order to standardize laser welding repair processes and controlling a residual stress which is induced by laser welding, we constructed the fully parallelized laser welding simulation code using one-fluid model (solid, liquid and gas phases are simultaneously calculated by one set of governing equations) and some advanced numerical models, e.g., VSIA (Volume and Surface Integrated Average) based CIP finite volume method for the discretization, the THINC/WLIC scheme for an accurate interface capturing and the robust and stable pressure Poisson equation solver, AMG preconditioned BiCGSTAB method. In the simulation, the base material is a pure aluminum which was included to the code as a physical parameter and we considered the surface tension force and its effect of a temperature gradient named Marangoni effect. As a result, reasonable results were obtained that is welding bead which is one of the representative behavior of a low power density laser welding and the appropriate shape of the vertical cross section of the molten pool. Therefore, the model can be applied to practical laser welding problems and contribute the standardization of a laser welding repair technology.