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Pulsed laser weld quality monitoring by the statistical analysis of reflected light
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
2009 (English)In: Lasers in manufacturing 2009: proceedings of the Fifth International WLT-Conference Lasers in Manufacturing, LIM 2009 : Munich, Germany, June 15th - 18th, 2009 / [ed] Andreas Ostendorf, Stuttgart: AT-Fachverlag , 2009, 369-374 p.Conference paper (Refereed)
Abstract [en]

This paper describes a technique for monitoring the quality of laser welds by statistical analysis of the reflected light signal from the weld surface. An algorithm is used which analyses the variance of the peak values of the reflected signal as a measure of surface weld dynamics during pulsed Nd:YAG laser welding in the heat conduction mode. Kalman filtering is used to separate a useful signal from the background noise. A good correlation between weld disruption and signal fluctuation has been identified. This technique could be used in tandem with the present practice of simply using the peak values of the reflected (or emitted) light as an indicator of weld quality.

Place, publisher, year, edition, pages
Stuttgart: AT-Fachverlag , 2009. 369-374 p.
Research subject
Manufacturing Systems Engineering
URN: urn:nbn:se:ltu:diva-27827Local ID: 160466a0-d5ce-11de-bae5-000ea68e967bOAI: diva2:1001018
WLT Conference on Lasers in Manufacturing : 15/06/2009 - 18/06/2009
Godkänd; 2009; 20091120 (ricols)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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