MATHEMATICAL-MODELS OF TRANSPORT PHENOMENA ASSOCIATED WITH ARC-WELDING PROCESSES - A SURVEY

A comprehensive survey is presented of research on transport phenomena , that is, heat flow, fluid flow, mass transfer, and electrodynamics, associated with arc welding. Both gas-metal arc-welding (GMAW) and gas -tungsten arc welding (GTAW) systems are considered, and appropriate e mphasis is placed on the intrinsic differences between these systems. The topics discussed include the behaviour of the arc, and its interac tion with both the electrode and the surrounding medium, on the one ha nd, and the behaviour of the weld pool on the other. The limited work done on the coupling between arcs, electrodes, and weld pools is also discussed, as are some process-control issues, but the problems of the rmal stress evolution and stress-induced deformation in the solid stat e are not treated. A critical discussion of the comparison between mod el predictions and experimental measurements is a key feature of the p resentation, which concludes with a discussion of the critical problem s that still need to be addressed.