LASER CLADDING CROSS-SECTION MODELING OBTAINED BY METALLIC POWDER SPRAYING INTO A NDYAG LASER-BEAM

This work presents a cross-section modeling of laser claddings by powder spraying in a cw Nd-YAG laser. We admit a homogeneous temperature repartition inside each powder particle during interaction time, a material's intern energy variation equals its absorbed energy and an optical extinction through a powder cloud following a Beer-Lambert law. Apart the good correlation obtained between model and experiments, this one shows experimentals data which change widely the cross-section (power, power feed, scanning speed). And we define and obtain experimentally an absorption coefficient which is nearly the value of a liquid metal absorption coefficient.