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Absorber-free Laser Transmission Welding of Transparent Polymers using Fixed Focus Optics and 3D Laser Scanner

  • Laser transmission welding is a well-known joining technology for thermoplastics, providing reliable and hermetical sealing without adhesives or particle formation. The main advantages of laser-based energy input - high precision, no additional adhesive and no particle emission - are essential for medical and optical applications. To obtain sufficient absorption in visually transparent polymers, thulium fibre lasers emitting in the polymers’ intrinsic absorption spectrum are used. Optics with high numerical aperture provide large intensity gradients inside the specimen, enabling selective fusing in the joining zone. Although the basic feasibility has already been demonstrated, the welding process lacks stability and productivity. Aim of this work is the determination of optimized settings for a fast and reliable welding process. Thus, the interplay of process parameters as well as their impact on the seam are analysed by thermal simulations. Calculated settings are verified by welding tests with COC, PA6 and PETG, using a fixed-focus optics and a 3D laser scanner with up to 200 mm/s feed rate.

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Metadaten
Author:Frederik MaiwaldORCiD, Stephan Englmaier, Stefan HierlGND
DOI:https://doi.org/10.1016/j.procir.2020.09.117
Parent Title (English):Procedia CIRP
Document Type:conference proceeding (article)
Language:English
Year of first Publication:2020
Release Date:2021/02/03
Volume:94
First Page:686
Last Page:690
Konferenzangabe:11th CIRP Conference on Photonic Technologies [LANE 2020] on September 7-10, 2020
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Laser-Materialbearbeitung (LMP)
Begutachtungsstatus:peer-reviewed
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
research focus:Produktion und Systeme
Licence (German):Creative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International