20 November 2001 Time-frequency analysis of laser weld signature
Author Affiliations +
Reliable monitoring methods are essential for maintaining a high level of quality control in laser welding. In industrial processes, monitoring systems allow for quick decisions on the quality of the weld, allowing for high productions rates and reducing overall cost due to scrap. A monitoring system using infrared, ultraviolet, audible sound, and acoustic emission was implemented for monitoring CO2 laser welds in real-time. The signals were analyzed using time-frequency analysis techniques. The time-frequency distribution using the Choi-Williams kernel was calculated, and the resulting distributions were analyzed using the Renyi information distribution. Results for porosity monitoring showed that an acoustic emission sensor held the most promise with 100% classification in two weld studies. These encouraging results led to a second study for monitoring of weld penetration and in the second case, infrared, ultraviolet, and audible sound showed the most promise with 100% classification for both laboratory and industrial data.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Allen S. Sun, Elijah Kannatey-Asibu, William J. Williams, Mark Gartner, "Time-frequency analysis of laser weld signature", Proc. SPIE 4474, Advanced Signal Processing Algorithms, Architectures, and Implementations XI, (20 November 2001); doi: 10.1117/12.448639; https://doi.org/10.1117/12.448639


Silicon Infrared Charge Transfer Devices
Proceedings of SPIE (December 15 1977)
New Laser Soldering Has Vision
Proceedings of SPIE (October 19 1987)
Smart sensors
Proceedings of SPIE (September 01 1991)
Horizon infrared surveillance sensor (HISS) a review of the...
Proceedings of SPIE (September 08 1995)

Back to Top