Lightweight components are generally composed of different materials for reasons of cost and stability. With this mix of materials, the specific characteristics of the materials applied are exploited specific to their load-bearing capacity. To join these materials, a technology is required that connects dissimilar materials securely and does so in short process times. The joining of plastic with metal poses a particular challenge since this combination cannot be welded directly and with highstrength.
Assistance is provided either by a joining process which utilizes high-speed laser micro structuring to furnish the metal surface with undercut structures and a defined roughness or the creation of a spongy, porous surface by means of ultrashort pulse lasers. In the subsequent laser-based joining process, the plastic is melted selectively on the joint between the metal and plastic, such that the latter can cramp reliably on the metal surface processed before. Thanks to a load-optimized dimension of the direction, form and number of structures, a large bandwidth of possible hybrid connecting structures for a multitude of material combinations results.