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Proceedings Paper

Laser transmission welding of long glass fiber reinforced thermoplastics
Author(s): Kira van der Straeten; Christoph Engelmann; Alexander Olowinsky; Arnold Gillner
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Paper Abstract

Joining fiber reinforced polymers is an important topic for lightweight construction. Since classical laser transmission welding techniques for polymers have been studied and established in industry for many years joint-strengths within the range of the base material can be achieved. Until now these processes are only used for unfilled and short glass fiber-reinforced thermoplastics using laser absorbing and laser transparent matrices. This knowledge is now transferred to joining long glass fiber reinforced PA6 with high fiber contents without any adhesive additives. As the polymer matrix and glass fibers increase the scattering of the laser beam inside the material, their optical properties, changing with material thickness and fiber content, influence the welding process and require high power lasers. In this article the influence of these material properties (fiber content, material thickness) and the welding parameters like joining speed, laser power and clamping pressure are researched and discussed in detail. The process is also investigated regarding its limitations. Additionally the gap bridging ability of the process is shown in relation to material properties and joining speed.

Paper Details

Date Published: 9 March 2015
PDF: 7 pages
Proc. SPIE 9356, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications IV, 93560H (9 March 2015); doi: 10.1117/12.2079566
Show Author Affiliations
Kira van der Straeten, Fraunhofer Institute for Laser Technology (Germany)
Christoph Engelmann, Fraunhofer Institute for Laser Technology (Germany)
Alexander Olowinsky, Fraunhofer Institute for Laser Technology (Germany)
Arnold Gillner, Fraunhofer Institute for Laser Technology (Germany)


Published in SPIE Proceedings Vol. 9356:
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications IV
Friedhelm Dorsch, Editor(s)

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