Optical Coherence Tomography for 3D Weld Seam Localization in Absorber-Free Laser Transmission Welding
Maiwald F, Roider C, Schmidt M, Hierl S (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 12
Pages Range: 2718
Issue: 5
DOI: 10.3390/app12052718
Abstract
Quality and reliability are of the utmost importance for manufacturing in the optical and medical industries. Absorber-free laser transmission welding enables the precise joining of identical polymers without additives or adhesives and is well-suited to meet the demands of the aforementioned industries. To attain sufficient absorption of laser energy without absorbent additives, thulium fiber lasers, which emit in the polymers’ intrinsic absorption spectrum, are used. Focusing the laser beam with a high numerical aperture provides significant intensity gradients inside the workpiece and enables selective fusing of the internal joining zone without affecting the surface of the device. Because seam size and position are crucial, the high-quality requirements demand internal weld seam monitoring. In this work, we propose a novel method to determine weld seam location and size using optical coherence tomography. Changes in optical material properties because of melting and re-solidification during welding allow for weld seam differentiation from the injection-molded base material. Automatic processing of the optical coherence tomography data enables the identification and measurement of the weld seam geometry. The results from our technique are consistent with microscopic images of microtome sections and demonstrate that weld seam localization in polyamide 6 is possible with an accuracy better than a tenth of a millimeter.
Authors with CRIS profile
Clemens Roider
Lehrstuhl für Photonische Technologien
Michael Schmidt
Lehrstuhl für Photonische Technologien
Additional Organisation(s)
Involved external institutions
Germany (DE)How to cite
APA:
Maiwald, F., Roider, C., Schmidt, M., & Hierl, S. (2022). Optical Coherence Tomography for 3D Weld Seam Localization in Absorber-Free Laser Transmission Welding. Applied Sciences, 12, 2718. https://dx.doi.org/10.3390/app12052718
MLA:
Maiwald, Frederik, et al. "Optical Coherence Tomography for 3D Weld Seam Localization in Absorber-Free Laser Transmission Welding." Applied Sciences 12 (2022): 2718.
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