With the increasing use of higher-strength steel sheet materials and property-optimized mixed construction methods, conventional resistance spot welding is being partly replaced by other joining techniques. The use of laser beam welding of overlap joints allows an improved application of the material, achieves a greater component strength, gives rise to improved corrosion protection, and leads to a reduction in component weight by reducing flange widths. The use of laser beam welded, unflanged, hydroformed components offers the design engineer entirely new possibilities for creating future vehicle structures from steel sheet. The notch sensitivity of higher-strength steel sheets makes it especially advantageous, when joining these materials, to combine resistance spot welding with bonding techniques, in order to ensure an improved strength behaviour of the joint under dynamic load. But the use of new mechanical joining techniques is also beneficial for joints on higher strength steel sheets. Though, even under an entirely static load, these joining techniques may not achieve the strengths of a resistance spot welded joint. Joints produced with these techniques are nevertheless considerably superior to a resistance spot welded joint under dynamic load. A combination with bonding is of interest even for mechanical joining techniques, as long as the adhesive in the joint area is not damaged or burnt under the influence of heat. A further advantage of mechanical joining techniques becomes evident in connection with the property-optimized mixed construction with different materials. Even joints between generically different materials are possible using these joining techniques. In order to make the potential of modern steel sheet materials optimally utilizable in a component structure, it is absolutely necessary to apply a joining technique that is appropriate to the properties of the material. In this respect, it must be remembered that the property profile of modern higher-strength steel sheets is considerably altered by the transfer of heat to the part. For this reason, joining techniques that work without heat are preferable.
Advanced joining techniques techniques for modern lightweight steel (suite) construction
Neue Verbindungsverfahren für den Leichtbau von Fahrzeugkarosserien
1998
13 Seiten, 17 Bilder, 1 Tabelle
Conference paper
English
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