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Signal overlap in the monitoring of laser welding
LuleƄ University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
2010 (English)In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 21, no 10Article in journal (Refereed) Published
Abstract [en]

Laser weld monitoring is usually based on the feedback from three photodiodes which are intended to provide independent information about the thermal condition of the melt (the T signal), the radiation from the plume of a heated gas above the melt (the P signal) and the amount of reflected laser light (the R signal). This work demonstrates that, in fact, the plume of the hot gas above the weld pool contributes a large part of the thermal signal, which has hitherto been assumed to come only from the melt itself. It is suggested that the correlation between the T and P signals is so strong that a T-P signal would be more useful than the raw T signal in identifying the fluctuations in infrared radiation from the melt pool

Place, publisher, year, edition, pages
2010. Vol. 21, no 10
Research subject
Manufacturing Systems Engineering
URN: urn:nbn:se:ltu:diva-13487DOI: 10.1088/0957-0233/21/10/105705Local ID: cb54da90-b740-11df-a707-000ea68e967bOAI: diva2:986440
Validerad; 2010; Bibliografisk uppgift: Paper id:: 105705; 20100903 (ysko)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved

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Eriksson, IngemarPowell, JohnKaplan, Alexander
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