June 21 - 24, 2021
International Congress Center, Munich, Germany
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Micro: Processing of Transparent Materials 2
Time: 24/June/2021: 2:45pm-4:00pm · Location: Room 3
Optical coherence tomography for 3D weld seam localization in absorber-free laser transmission welding
1Ostbayerische Technische Hochschule Regensburg, Labor Lasermaterialbearbeitung, Technologie Campus Parsberg-Lupburg, Am Campus 1, 92331 Parsberg, Germany; 2Institute of Photonic Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Konrad-Zuse-Straße 3/5, 91052 Erlangen, Germany; 3Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul-Gordan-Str. 6, 91052 Erlangen, Germany
Thulium fibre lasers emit in the intrinsic absorption spectrum of polymers and enable welding of transparent parts without absorbent additives. Focusing with high NA provides large intensity gradients inside the workpiece, enabling selective fusing of the joining zone without affecting the surface. Therefore, absorber-free laser transmission welding is well suited to fulfil the high demands on quality and reliability in manufacturing of optical and medical devices. However, monitoring the welding process is required, since seam size and position are crucial for quality.
The aim of this work is the volumetric acquisition of the weld seam’s location and size using optical coherence tomography. Due to the change of the optical properties during melting, the seam can be distinguished from the base material. The results coincide 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 millimetre.
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