Simulation of the effectiveness of dynamic cooling for controlling residual stresses in friction stir welds
- Richards D.G. ,
- Prangnell P.B. ,
- Withers P.J. ,
- et al
- Richards D.G. ,
- Prangnell P.B. ,
- Withers P.J. ,
- Williams S.W. ,
- Nagy T. and
- Morgan S.
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A simplified finite element modelling approach was employed to analyse the effect of localised dynamic cooling on residual stress development during friction stir welding (FSW), and the model predictions were compared with x-ray synchrotron and neutron diffraction results obtained from welded AA 2024-T3 sheets. The finite element model was used to simulate residual stress measurements made on FSW joints where a liquid CO2 spray/snow had been applied and experiments were conducted to calibrate the power of a CO2 cooling nozzle developed for dynamical control-low stress no distortion welding. Issues discussed include the influence of cooling sink size and positioning (in relation to the weld line and ahead or behind the tool) on residual stress reduction and the relative effectiveness of dual and single nozzles.
7th International Symposium, 20-22 May 2008, 3A: Process/Control 1, Paper 04
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