Keyhole: modeling during cw Nd:YAG laser welding

Evelyne Dumord; Jean-Marie Jouvard; Dominique F. Grevey

doi:10.1117/12.251180

23 September 1996 Keyhole: modeling during cw Nd:YAG laser welding

Evelyne Dumord, Jean-Marie Jouvard, Dominique F. Grevey

Proceedings Volume 2789, High-Power Lasers: Applications and Emerging Applications; (1996) https://doi.org/10.1117/12.251180
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

Abstract

The model developed allows 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, form 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.

Citation Download Citation

Evelyne Dumord, Jean-Marie Jouvard, and Dominique F. Grevey "Keyhole: modeling during cw Nd:YAG laser welding", Proc. SPIE 2789, High-Power Lasers: Applications and Emerging Applications, (23 September 1996); https://doi.org/10.1117/12.251180

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