Abstract
The feasability of surface treatments by cw YAG laser has been established. Concerning solid phasis treatment, we explored superficial quenching of grey cast iron. It brings out that it's no necessar to precoat the sample before treatment, the natural absorptivity is suffisant. Concerning liquid phasis transformation two examples are presented : surface alloying and cladding. For the first one, the power required for a given melted depth is 2 times lower than for a CO2 beam. Concerning the second example, it appears that the use of a step index fiber could ameliorate obtained results. Finally from a metalurgical point of view, obtained structures are the same than with a CO2 beam.
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