Abstract
A mathematical model of plasma arc welding is developed to numerically simulate the transient variation of plasma arc heat flux and pressure distribution on the curved keyhole wall. As the keyhole evolves from blind status to open status, the curvature of keyhole boundary changes with time and the distributions of heat intensity and arc pressure along the keyhole wall are correspondingly varied. The effect of keyhole shape and size on both heat flux and arc pressure distribution on the keyhole wall is quantitatively analyzed.
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