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Proceedings Paper

Keyhole description in deep-penetration laser welding
Author(s): Remy Fabbro; Karim Chouf
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Paper Abstract

We study the keyhole geometry as a function of the main operating parameters such as welding speed, laser incident intensity or sample material. This model is based on a drilling velocity whose combination with the welding velocity causes the inclination of the front keyhole wall. This front inclination is shown to be stationary and stable all along the front keyhole wall (FKW). The penetration depth results from the product of this drilling velocity and a characteristic time defined as the beam diameter divided by the welding speed. By using a ray-tracing procedure, the dynamics and the complete keyhole geometry can be determined by taking into account the multiple reflections inside the keyhole and a description of the closure process of the rear keyhole wall (RKW). We show that this RKW cannot be stationary all along its surface and only and adequate laser intensity distribution can make it stationary. The interest of elongated focal spots or twin-spots is then demonstrated. At high welding velocity the front wall is inclined and is composed of several layers resulting of the successive reflections. The rear wall fluctuates around an apparent equilibrium, and corresponding fluctuations occur on maximum penetration depth.

Paper Details

Date Published: 7 February 2000
PDF: 9 pages
Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000); doi: 10.1117/12.377087
Show Author Affiliations
Remy Fabbro, Cooperation Laser Franco-Allemand (France)
Karim Chouf, Cooperation Laser Franco-Allemand (France)

Published in SPIE Proceedings Vol. 3888:
High-Power Lasers in Manufacturing
Xiangli Chen; Tomoo Fujioka; Akira Matsunawa, Editor(s)

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