A. R. Lawrence, United States Coast Guard, Washington, DC; P. Michaleris, Pennsylvania State University, University Park, PA
MIG and GMAW-laser hybrid welding cases are developed to evaluate the af-
fects of neglecting thermal transport. The thermal transport response of the welds is
calculated using computational fluid dynamics in an Eulerian reference frame and then
transferred to coarser finite element meshes in a Lagrangian frame for mechanical analy-
sis. Non-thermal transport cases are developed to compare to the thermal response. The
hybrid model results show differences in displacement magnitude when thermal trans-
port is neglected, but stress, temperature, and MIG displacement results indicate that
neglecting thermal transport is a reasonable assumption for mechanical weld modeling.
Summary: The assumption that thermal transport within the weld pool may be neglected is used frequently in mechanical analyses of welding models. In this research, a single MIG and a MIG-laser hybrid butt weld are modeled with and without considering thermal transport and the thermal, residual stress, and distortion results are compared.
