抄録
Several numbers of physical model and theoretical description with laser-based thermal cutting processes have appeared in technical reports and papers. In nearly all cases, these papers construct a theoretical model (energy balance, increase or loss of mass, etc.) for the cutting front and add to it a qualitative description; as such, these reports address the phenomenon in a static way. In the laser cutting, the interrelationship among the beam, molten metal and reactive gas jet is characterized by dynamic processes. Therefore a theoretical discussion should address the phenomenon in a dynamic way. This paper studies in detail the mechanism of oxidation and diffusion as well as the process of forming a cutting front by analyzing the formation of a molten layer, the expelling of molten metal with a reactive gas jet of oxygen, diffusion of oxygen molecules and iron atoms.
