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Laser structured surfaces for metal-plastic hybrid joined by injection molding

: Gebauer, Jana; Fischer, Matthieu; Lasagni, Andrés-Fabián; Kühnert, Ines; Klotzbach, Annett


Journal of laser applications : JLA 30 (2018), No.3, Art. 032021
ISSN: 1042-346X
ISSN: 1938-1387
Bundesministerium für Bildung und Forschung BMBF
Development of laser based joining technologies for dissimilar lightweight constructions
Journal Article
Fraunhofer IWS ()
cw laser; injection molding; laser structuring; metal-plastic hybrid; ultrashort-pulse laser

The aim of this work is to investigate the influence of surface structures on the adhesion strength of metal-plastic hybrids. Aluminum substrates were structured with continuous wave and picosecond pulsed laser systems and overmolded with a thermoplastic polyamide material. The materials were examined in terms of structure topography, molding accuracy, and a tensile shear test. It was found that the surface pretreatment by laser structuring with continuous wave laser enhances the effective joining surface, creates a mechanical interlocking, and increases the adhesion strength of the hybrid compared to the untreated condition significantly. A shear strength of 11.9 MPa was achieved, which exploits 90% of the pure polyamide properties.