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A study on change point detection methods applied to beam offset detection in laser welding
University West, Department of Engineering Science, Division of Production Systems. (PTW)ORCID iD: 0000-0002-8771-7404
University West, Department of Engineering Science, Division of Production Systems. (PTW)ORCID iD: 0000-0001-5734-294X
University West, Department of Engineering Science, Division of Production Systems. (PTW)ORCID iD: 0000-0001-5608-8636
2019 (English)In: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 6, p. 72-79Article in journal (Refereed) Published
Abstract [en]

This paper presents an experimental study where a photodiode integrated into a laser beam welding tool is used to monitor laser beam spot deviations fromthe joint, the beam offset. The photodiode system is cost effective and typically easy to implement in an industrial system. The selected photodiode is a silicondetector sensitive in the spectral range between 340-600nm which corresponds to the spectral emissions from the plasma plume. The welding application is closed-square-butt joint welding where a laser beam offset can cause lack of fusion in the resulting weld. The photodiode signal has been evaluated by two different change point detection methods, one off-line and one on-line method, with respect to their detection performance. Off-line methods can be used to guide post weld inspection and on-line methods have the potential to enable on-line adaptive control or the possibility to stop the process for repair. The performance of the monitoring system and the change point detection methods have been evaluated from data obtained during laser beam welding experiments conducted on plates of stainless steel. The results clearly indicates the possibility to detect beam offsets by photodiode monitoring.

Place, publisher, year, edition, pages
2019. Vol. 6, p. 72-79
Keywords [en]
Laser beam welding; monitoring; photodiode; change point detection
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-14384DOI: 10.1016/j.promfg.2019.08.011OAI: oai:DiVA.org:hv-14384DiVA, id: diva2:1348729
Conference
17th Nordic Laser Materials Processing Conference - (NOLAMP17), 27 –29 August 2019
Funder
Vinnova, 2016-03291Available from: 2019-09-05 Created: 2019-09-05 Last updated: 2019-09-05

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Nilsen, MorganSikström, FredrikChristiansson, Anna-Karin

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