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Because of local modifications of the grain structure in the heat-affected zone of the welding as well as a different chemical composition of the weld metal as compared to the base material the various areas of a welding exhibit a different deformation- and strain behaviour. To evaluate the influence of the material behaviour and the process behaviour of the joining procedure on the strain behaviour of the welding the application of laser-optical sensoring offers a new source of information. In particular, results of investigations of weldings made of sheet metals will be presented. As a welding process for tailored blanks, high frequency welding is particular emphasized in this presentation apart from the process of laser beam welding. The investigations also have the purpose to be a basis for the verification of FEM calculations and to develop appropiate material models.

Because of the increasing demand of lightweight construction, sheet-metals made from conventional and high-tensile steels or aluminum were developed to be a high-quality semi-finished product with a wide range of properties. Thus it was made possible to access extended and innovative techniques for the processing of sheet-metal components with complex design, such as tailored blanks, and to realize load-optimized component properties. The supposition for material-specific processing is provided by a close cooperation of a material-related and product-orientated fundamental research. Since 1993, such an interacting research-partnership between the Technical Universities of Clausthal and Hannover in Germany is represented by a “Collaborative Research Center SFB 362” titled “Sheet-Metal Technology - Processes for Production and Applications”.