205 Development of Simulation Technique for Laser Material Processing
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One of the most urgent problems to be solved in laser material processing is to develop appropriate technique to control laser welding in order to establish the laser welding as the most reliable process and to extend its applications widely. Therefore, it is strongly desirable to develop simulation technique that can predict appropriate welding conditions and stability of welding phenomenon, as well as construct physical models based on accurate monitoring. The laser welding contains many complicated phenomena, such as reflection and absorption of laser light on a material surface, phase transition, and so on. 3-dimensional unified simulation scheme for the laser welding was improved, that is based on conservative equations of multi-phase and multi-component fluids. Thermal-hydraulic phenomena of molten pool and keyhole were solved numerically. Multiple reflection of the laser light on the keyhole surface was treated by ray-tracing method. In the present study, we discuss outline of the mathematical model and its availability.
