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Approaches for automatic detection of mispositioning during laser welding in hidden T-joints using optical coherence tomography

  • Laser welding of hidden T-joints, connecting the web-sheet through the face-sheet of the joint can provide advantages like increased lightweight potential in manufacturing sandwich structures with thin-walled cores. However, maintaining the correct positioning of the beam relative to the joint is challenging. A method to reduce the effort of positioning is using optical coherence tomography (OCT), that interferometrically measures the reflection distance inside of the keyhole during laser deep penetration welding. In this study new approaches for targeted data processing of the OCT-signal to automatically detect misalignments are presented. It is shown that considering multiple components from the inference pattern and the respective signal intensities improve the detection accuracy of misalignments.

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Author:Timon Ahlers, Ronald Pordzik, Thorsten Mattulat
Parent Title (German):13. Mittweidaer Lasertagung
Publisher:Hochschule Mittweida
Place of publication:Mittweida
Document Type:Conference Proceeding
Year of Completion:2023
Publishing Institution:Hochschule Mittweida
Contributing Corporation:Bremer Institut für angewandte Strahltechnik GmbH
Release Date:2023/12/12
Tag:Laser beam welding; optical coherence tomography; sensor technology
Page Number:6
First Page:47
Last Page:52
Open Access:Frei zugänglich
Licence (German):License LogoUrheberrechtlich geschützt