抄録
A three-dimensional heat conduction model for laser material processings was developed using the finite difference method. The model was represented in a moving slab which was divided into several unequal volume elements, where stationary continuous wave laser beam interacts with a surface of the slab. The model could evaluate a key-hole effect in a laser welding process. Typical four kinds of converged laser beam profile were considered in the model because laser beam profile has critical influence of laser processing characteristics. In order to verify the validity of the model, outputs were compared with the analytical solution of Jaeger. To show more practical applicability, laser surface hardening and laser welding experiments were conducted using 15kW continuous wave CO2 laser. This experimental results were compared with the model outputs, and good agreement was obtained.