27 March 1997 Optical method of penetration sensing for pulsed Nd:YAG laser welding
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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.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marcelino Essien, Marcelino Essien, David M. Keicher, David M. Keicher, } "Optical method of penetration sensing for pulsed Nd:YAG laser welding", Proc. SPIE 2993, Lasers as Tools for Manufacturing II, (27 March 1997); doi: 10.1117/12.270012; https://doi.org/10.1117/12.270012
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