Mr. Wolf-Martin Hoffmann Profile

Wolf-Martin Hoffmann

at RWTH Aachen Univ

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Proceedings Article | 20 March 2007 Paper

Laser welding of micro plastic parts

E. Haberstroh, W.-M. Hoffmann

Proceedings Volume 6459, 645903 (2007) https://doi.org/10.1117/12.697561

KEYWORDS: Laser welding, Photomasks, Laser processing, Laser sources, Laser scattering, Laser applications, Transmittance, Semiconductor lasers, Scattering, Radiation effects

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Most welding processes for plastics do not meet the demands of micro technology and thus cannot be applied in this innovative industrial sector. One of the few techniques which are applicable in this sector is the laser transmission welding, which has distinctive advantages like low mechanical and thermal load of the joining parts. This makes the laser particularly suitable for the welding of micro plastics parts. Thereby, contour welding is a process variant of laser transmission welding enabling the welding of complex and even three-dimensional weld contours. But so far it has not yet been applied for welding plastics parts of micro scale in the industrial practice. Recent research at the Institute of Plastics Processing (IKV) at the RWTH Aachen University shows the feasibility of this process to weld small and complex micro parts. Good mechanical properties can be achieved. However, it is necessary to apply measures to reduce the formation of flash. Moreover, it can be shown that there is a strong influence of some material parameters on the laser welding process so that some plastics are more suitable than others for the contour welding in micro technology.

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