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Monitoring of Varying Joint Gap Width During Laser Beam Welding by a Dual Vision and Spectroscopic Sensing System
University West, Department of Engineering Science, Division of Production System. (PTW)ORCID iD: 0000-0002-8771-7404
University West, Department of Engineering Science, Division of Production System. (PTW)ORCID iD: 0000-0001-5734-294X
University West, Department of Engineering Science, Division of Production System. (PTW)ORCID iD: 0000-0001-5608-8636
University West, Department of Engineering Science, Division of Production System. IFN-CNR Institute for Photonics and Nanotechnologies, Physics Department, via Amendola 173, 70126 BARI, Italy. (PTW)ORCID iD: 0000-0002-6247-5429
2017 (English)In: Physics Procedia, ISSN 1875-3892, E-ISSN 1875-3892, Vol. 89, 100-107 p.Article in journal (Refereed) Published
Abstract [en]

A vision and spectroscopic system for estimation of the joint gap width in autogenous laser beam butt welding is presented. Variations in joint gap width can introduce imperfections in the butt joint seam, which in turn influence fatigue life and structural integrity. The aim of the monitoring approach explored here is to acquire sufficiently robust process data to be used to guide post inspection activities and/or to enable feedback control for a decreased process variability. The dual-sensing approach includes a calibrated CMOS camera and a miniature spectrometer integrated with a laser beam tool. The camera system includes LED illumination and matching optical filters and captures images of the area in front of the melt pool in order to estimate the joint gap width from the information in the image. The intensity of different spectral lines acquired by the spectrometer has been investigated and the correlation between the intensity of representative lines and the joint gap width has been studied. Welding experiments have been conducted using a 6 kW fiber laser. Results from both systems are promising, the camera system is able to give good estimations of the joint gap width, and good correlations between the signal from the spectrometer and the joint gap width have been found. However, developments of the camera setup and vision algorithm can further improve the joint gap estimations and more experimental work is needed in order to evaluate the robustness of the systems.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 89, 100-107 p.
Keyword [en]
Laser beam welding; Butt joints; Varying gap width; Vision sensor; Spectroscopic sensor
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-11898DOI: 10.1016/j.phpro.2017.08.014Scopus ID: 2-s2.0-85037711817OAI: oai:DiVA.org:hv-11898DiVA: diva2:1164274
Conference
16th Nordic Laser Materials Processing Conference, NOLAMP16
Available from: 2017-12-11 Created: 2017-12-11 Last updated: 2018-01-06Bibliographically approved

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Nilsen, MorganSikström, FredrikChristiansson, Anna-KarinAncona, Antonio

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