Product Code: PIC06_104

Laser Joining of Aluminium to Titanium with Focus on Aeronautical Applications
Authors:
Florian Wagner, BIAS Bremer Institut Fuer Angewandte Strahltechnik; Bremen Germany
Frank Vollertsen, BIAS Bremer Institut fuer angewandte Strahltechnik; Bremen Germany
Michael Kreimeyer, BIAS Bremer Institut fuer angewandte Strahltechnik; Bremen Germany
Rainer Kocik, Airbus Deutschland GmbH; Bremen Germany
Harald Kohn, BIAS; Germany
Presented at PICALO 2006

For aeronautical applications, hybrid structures made of titanium and aluminium alloys offer advantages in comparison to conventional designs. Due to the demands of the aircraft industry for new material combinations based on commercially available and qualified materials, laser processes for joining aluminium to titanium in different configurations are developed. By utilizing laser technique instead of conventional thermal joining processes, joining of aluminium-titanium tailored blanks and structures with desirable properties can be achieved. In such dissimilar material joints, the properties are generally dominated by the intermetallic phase layer, which is formed during thermal joining of aluminium with titanium. By minimization of the overall energy input due to high joining speed and geometrically restricted energy input, the intermetallic phase formation can be limited to a minimum size, resulting in good tensile strength and promising forming behaviour. Within this paper, an overview about laser joining of aluminium to titanium in different joint configurations will be presented, including FEM-simulation, characterization of the seam morphology and the mechanical properties.