Residual stress minimization by in-situ global mechanical tensioning in friction stir welds of high strength aluminium alloys
- Altenkirch J. ,
- Steuwer A. ,
- Peel M.J. ,
- et al
- Altenkirch J. ,
- Steuwer A. ,
- Peel M.J. and
- Withers P.J.
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Neutron and synchrotron x-ray diffraction techniques were employed to determine the effect of global mechanical tensioning on residual stress in friction stir welded joints fabricated in AA 2199-T8 (Al, 2.63%Cu, 1.56%Li) and AA 7449-W51 (Al, 7.5-8.7%Zn, 1.8-2.7%Mg, 1.8-2.4%Cu) high-strength aluminium alloy plates (thickness 5 and 5-20 mm, respectively). The global mechanical tensioning load was applied by hydraulic rams with serrated and hardened jaws. Residual stress distribution was evaluated as a function of distance from the weld line and from the weld surface in joints tensioned to different percentages of the parent metal yield strength. The relationship between stress distribution, weld distortion level, macrostructure and hardness evolution during welding is discussed.
7th International Symposium, 20-22 May 2008, 8B: Mechanical Properties, Paper 02
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