Three-dimensional particle simulation of buried space formation process during high current gas metal arc welding

Abstract

A drop transfer mode and a rotating transfer mode in high current gas metal arc welding named buried arc welding were modeled using a particle method that was suitable for numerical simulations of a fluid behavior with phase changes and large deformations. Numerical simulations of the buried space and weld pool formation processes in both a drop transfer condition and a rotating transfer condition were conducted using computational models to clarify the effects of the arc pressure distribution and the transport position of the molten metal droplets on the buried space. Finally, numerical simulations using conditions combining these transfer modes to imitate low frequency modulated voltage control were also conducted. As a result, the computational model developed in this study clarified the roles of the drop transfer mode and the rotating transfer mode in the buried space formation process during buried arc welding. Moreover, the mechanisms of the experimental results obtained in a previous study, in which a deep penetration depth was obtained while preventing the collapse of the buried space by switching between the transfer modes, were qualitatively clarified.