Fatigue assessment of AA 8090 friction stir butt welds after surface finishing treatment

Authors: M. Pedemonte, C. Gambaro, E. Lertora, C. Mandolfino

Abstract:
Combining great performances with high standards of safety and efficiency is the challenge for most aircraft manufacturers. Aircraft are subjected to extraordinary loads, repeated for millions of cycles also in extreme environmental conditions, hence every component must be designed and manufactured to maximize its fatigue resistance.
      Friction Stir Welding of aluminium alloys and surface finishing process as might be a good solution to reach this goal. The high performances reached in this field with the use of this technique could be further increased reducing the welded surface irregularity, which might promote the development of a dangerous fatigue failure mechanism.
       In this work, the effect of the welded surface finishing treatment on the fatigue behavior of AA8090 FSW butt joints was assessed. The results obtained from the dynamic tests highlighted the higher fatigue resistance of finished specimens, with respect to the as-welded joints.

Keywords:
Friction Stir Welding
AA 8090
Fatigue
Surface finishing

Published in: Aerospace Science and Technology  (Volumes 27, Issue 1, June 2013)

Publisher: Elsevier

ISSN Information: 1270-9638

Fatigue assessment of AA 8090 friction stir butt welds after surface finishing treatment

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