Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Weld quality and formability of laser welded blanks of aluminium alloys

Datum: 20.11.2001



  • Prof. Dr.-Ing. M. Geiger
  • Prof. Dr.-Ing. F. Vollertsen, Universität Paderborn

Welded blanks of steel materials are part of modern light weight car bodies since more than 20 years. But, there is further potential for weight saving if those "tailored blanks" are made of aluminium alloys. Nevertheless, there are no industrial applications by now. The reason is a lack of knowledge of the car manufacturers and their suppliers concerning the process technology for the production as well as the forming of aluminium tailored blanks. The Dr.-Thesis therefore discusses the issue, what properties (porosity, cracks, tensile strength, strain values) can be achieved, if proper welding parameters are used. The investigations were done with typical car body alloys of the 5xxx and 6xxx series. Based on the above described results strategies were developed that lead to a high weld quality and a good formability also for non linear welds. The successful application is shown for different, typical tailored blank parts, such as longitudinal members and car door inner panels.