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Online pyrometry for weld seam localization in absorber-free laser transmission welding of transparent polymers

  • Optical and medical devices made of transparent polymers are gaining popularity because of its cost advantages. The manufacturing technology must be able to meet the high demands of these applications. Advantages of laser transmission welding – contactless input of energy, precision, no adhesives and no particle formation – can be exploited here. For absorber-free welding, lasers emitting in the polymers‘ intrinsic absorption spectrum are used. Focusing the laser beam with high NA enables selective fusing of the joining zone. Since a molten upper surface leads to visible and palpable irregularities, the lateral expansion of the weld seam is monitored in this work. Welding tests with 1 mm thick plates of COC are performed and monitored by pyrometry. Distances between seam and surface measured in thin cuts and are compared with the pyrometer signal. This shows that the localization of the weld seam is possible and proper and faulty parts can be distinguished by pyrometry.

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Metadaten
Author:Frederik MaiwaldORCiD, Stephan Englmaier, Stefan HierlGND
URL / DOI:http://www.jlps.gr.jp/en/proc/lpm/20/073.pdf
Parent Title (German):21st International Symposium on Laser Precision Microfabrication: Dresden, 26.06.2020
Document Type:conference proceeding (article)
Language:English
Year of first Publication:2020
Release Date:2021/01/25
GND Keyword:Laserdurchstrahlschweissen; Kunststoff; Transparenz; Schweißnaht; Wärmestrahlung; Pyrometrie; Prozessüberwachung
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Laser-Materialbearbeitung (LMP)
research focus:Produktion und Systeme