A dynamic welding heat source model in pulsed current gas tungsten arc welding

In pulsed current gas tungsten arc welding (PCGTAW), the peak current is generally selected to give adequate penetration and bead contour, while the background current is set at a level sufficient to maintain a stable arc. It is well seen that the arc is bell-shaped during the peak pulse duration while not during the background duration. A dynamic welding heat source model was established according to the characteristic of PCGTAW, and better simulation results were obtained.