Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Sheet hydroforming of friction stir welded hybrids composed of steel and aluminium - Friction Stir Welding

Project Status: finished


Friction stir welded lap joints of steel and aluminium sheets, each in a thickness of 1 mm, are already successfully realized in the framework of this research. To face the high wear and the low welding feed for tailored hybrids in a butt joint configuration, friction stir knead welding and laser-assisted friction stir welding were established. Within the latter the laser beam of a diode laser is projected onto the steel sheet in order to reduce the flow stress of steel. Therefore the high differences of initial strength between steel and aluminium are converged. This circumstance allows a stirring of these two materials and to achieve finally a metallic continuity in the weld seam, which is essential for sheet hydroforming. An other important aim is reached due to the fact that the heating of the sheet enables an enhanced endurance of the friction stir welding tool, especially of the probe, as the forces in the interaction zone between the tool and the sheet are lower in comparison to conventional friction stir welding, and last but not least which also allows to perform higher welding feeds.



    • Degner, J.; Herrmann, J.; Junker, F.; Berendt, E.; Merklein, M.:
      Leichtbauwerkstoffe für den modernen Automobilbau.
      Zeitschrift Konstruktion 3(2018), pp. 50-54

    Letztes Update: 01.01.2010