Abstract: A novel model was presented to predict the evolutionary development of cladding layer, and a method based on Lambert-Beer theorem and Mie's theory was adopted to treat the interaction between powder stream and laser beam. By using the continuum model and enthalpy-porosity method, the uid ow and heat transfer in solid-liquid phase change system were simulated. The commercial software PHOENICS, to which several modules were appended, was used to accomplish the simulation. Numerical computa- tion was performed for Stellite 6 cladding on steel, the obtained results are coincident with those measured in experiment basically.

Key words: laser cladding, powder feeding, cladding layer,