Abstract
A numerical model is developed to study the oxidation effects in oxygen-assisted laser cutting of mild steel. Coupled oxygen concentration and energy balance equations are solved by a control-volume based computational scheme while the velocity field is obtained by analytical boundary theory. Theoretical explanation on striation formation is given based on an instability analysis of the molten front. The striation frequency and depth are predicted. The steady-state simulation results include the temperature and oxygen concentration profiles at the cut front, the effects of impurity gas on the cutting speed, reaction energy, conduction loss, and heat affected zone. The dynamic simulation shows the oscillation of the molten temperature that is related to striations. The striation frequency and depth are experimentally validated.
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