Effects of Surface Finish on the Solid State Welding of High Strength Aircraft and Aerospace Aluminium Alloys

  • H. M. Tensi
  • M. Wittmann

Abstract

This paper reports some effects of different surface preparation methods on the bond quality of diffusion welded Aluminium alloy sheets. The preparation methods included grinding and steel brushing as well as “RF sputter cleaning” with a subsequent sputter deposition of Cu, Ag or Au.

Surface and depth profile analyses were carried out by means of Auger-Electron-Spectroscopy (AES) and Glow Discharge Source (GDS) Plasma-Emission-Spectroscopy in order to verify the surface characteristics of the sheets to be bonded. For the welding experiments a DB-Hot-Press with a vaccum chamber has been developed especially for the Diffusion Bonding of high strength Al-sheets. The bonding process is characterized especially by the application of the weld pressure during the heating phase and by a controlled cooling phase.

Mechanical tests were carried out by shear testing and peel testing at room-temperature and SPF-temperature (516°C). Additionally metallographic and fractographic methods were used for a further characterization of the joints. The results show that basic material properties can be obtained in the solid state welding by an optimum surface treatment and optimized bonding parameters.

Keywords

Shear Strength Coated Bond Bond Quality Diffusion Bond Bond Shear Strength 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    Winkler, P.J., Diffusion Bonding and Superplastic Forming, two complementary manufacturing techniques. Proceedings of Int. Conf. on Superplasticity and Superplastic Forming, Blaine, USA, Aug. 1988Google Scholar
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    Jellison, J.L., The role of surface contaminants in the solid-state welding of materials. Treatise on clean surface technology, volume 1, Plenum Press, New York, London, 1988, p.205–234Google Scholar
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    Kazakov, N.F., Diffusion Bonding of materials. Pergamon Press, Frankfurt, 1981Google Scholar
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    Tensi, H.M., Wittmann, M., Friedrich, H.E., Schmidt, J.J., Diffusion bonding of high strength aircraft and aerospace aluminium alloys. Light weight alloys for aerospace applications, Proc. of a TMS-symposium, Las Vegas, USA, 1989Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1990

Authors and Affiliations

  • H. M. Tensi
    • 1
  • M. Wittmann
    • 1
  1. 1.Technische Universität MünchenMünchenGermany

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