Keyhole modelling during cw Nd:YAG laser welding
- IUT, Le Creusot (France)
The model developed allows one to know the temperature field in a cw Nd:YAG laser joining piece. To realize the model, a physical approach has been used for defining the heat sources. First, from a pressures balance the geometry of the keyhole is determined. Then, an analysis of the plume existing at the surface of the target shows that the beam is scattered by the plume and consequently the heated area is enlarged. More a spectrometric characterization indicates that no ionized particles exist in the plume and certainly in the keyhole. So Fresnel absorptions are the predominant effects for energy absorption in the keyhole. This assumption is verified owing to Fresnel absorption coefficient measurements.
- OSTI ID:
- 522463
- Report Number(s):
- CONF-9606246--; ISBN 0-8194-2175-8
- Country of Publication:
- United States
- Language:
- English
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