Laser transmission welding of long glass fiber reinforced thermoplastics

Kira van der Straeten; Christoph Engelmann; Alexander Olowinsky; Arnold Gillner

doi:10.1117/12.2079566

9 March 2015 Laser transmission welding of long glass fiber reinforced thermoplastics

Kira van der Straeten, Christoph Engelmann, Alexander Olowinsky, Arnold Gillner

Proceedings Volume 9356, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications IV; 93560H (2015) https://doi.org/10.1117/12.2079566
Event: SPIE LASE, 2015, San Francisco, California, United States

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.

Citation Download Citation

Kira van der Straeten, Christoph Engelmann, Alexander Olowinsky, and Arnold Gillner "Laser transmission welding of long glass fiber reinforced thermoplastics", Proc. SPIE 9356, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications IV, 93560H (9 March 2015); https://doi.org/10.1117/12.2079566

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