Prediction of electrode properties in Gas Tungsten Arc Welding (GTAW) and Gas Metal Arc Welding (GMAW)

摘要

Recent advances in the availability of computers and developments in numerical analysis now make possible numerical predictions of temperatures of the welding electrode in GTAW and GMAW, in a unified arc-electrode treatment. Predictions are made in two dimensions, for any given current, welding gas, and electrode configuration. For GTA W, predictions of surface temperatures of thoriated tungsten electrodes are in fair agreement with temperature measurements made spectroscopically. For GMAW predictions of molten droplet sizes, including the transition current between globular and spray transfer, are in fair agreement with experimental results for argon. Insights have been obtained into the mechanism of the formation of tungsten inclusions in GTAW, effects of molecular gases added to argon welding gas, andthe mechanism of the transition current from globular to spray transfer in GMAW.