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Proceedings Paper

Laser transmission welding of absorber-free thermoplastics using dynamic beam superposition
Author(s): Viktor Mamuschkin; Alexander Olowinsky; Kira van der Straeten; Christoph Engelmann
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Paper Abstract

So far, the main approach to weld absorber-free thermoplastics is exploiting their intrinsic absorption by choosing a proper wavelength of the laser. In order to melt the joining partners spatially restricted at the interface usually optics with a high numerical aperture are used. However, practice shows that the heat affected zone (HAZ) extends over a large area along the beam axis regardless of the optics used. Without clamping or convective cooling thermally induced expansion of the material can cause blowholes or deformation of the irradiated surface. To reduce the thermal stress on the part surface a dynamic beam superposition is investigated with the laser beam performing a precession movement.

Paper Details

Date Published: 9 March 2015
PDF: 8 pages
Proc. SPIE 9356, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications IV, 93560Y (9 March 2015); doi: 10.1117/12.2079691
Show Author Affiliations
Viktor Mamuschkin, Fraunhofer Institute for Laser Technology (Germany)
Alexander Olowinsky, Fraunhofer Institute for Laser Technology (Germany)
Kira van der Straeten, Fraunhofer Institute for Laser Technology (Germany)
Christoph Engelmann, 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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