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Proceedings Paper

Optical method of penetration sensing for pulsed Nd:YAG laser welding
Author(s): Marcelino Essien; David M. Keicher
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Paper Abstract

The ability to monitor and control the depth of a laser weld in real-time is critical in many laser welding applications. Consequently, we have investigated the use of an optical method to sense weld depth. Welds were generated on kovar samples, using a pulsed Nd:YAG laser. The sensing method uses digital high-speed photography to measure the velocity of the plume of vaporized metal atoms ejected from the metal surface. An energy balance equation is then used to relate the plume velocity to the size of the weld. Numerical solution of the energy balance equation yielded values for weld depth that were within 8% of the actual measured values.

Paper Details

Date Published: 27 March 1997
PDF: 7 pages
Proc. SPIE 2993, Lasers as Tools for Manufacturing II, (27 March 1997); doi: 10.1117/12.270012
Show Author Affiliations
Marcelino Essien, Sandia National Labs. (United States)
David M. Keicher, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 2993:
Lasers as Tools for Manufacturing II
Leonard R. Migliore; Ronald D. Schaeffer, Editor(s)

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