The use of lasers for the surface pretreatment of adhesive bonding parts

Materials, which are often used in the production engineering, are metals, plastics and composite materials. If these materials are used in an arrangement mix, the adhesive bonding technology is one of the most important joining technologies in the modern production. The load capacity of an adhesive bonding is determined by the cohesive and adhesive properties of the adhesives and the interaction between substrate and adhesive. The bond forces between the surface of the substrate and the adhesive are mostly based on auxiliary valence bonds, more seldom on valence bonds. The adhesion is based on a chemical bond or a mechanical clamp of the adhesives at the substrate of the surface. In the frame of some projects, lasers are used to clean the surface of technical materials, to increase the wettability and to improve the adhesion and the aging stability of bonded joints. First results show, that it is partly possible, to renounce complete the use of an additional primer and the pure laser pretreatment is enough to ensure good results. Further on it is clear, that different materials need different laser sources with different wavelength.