Abstract
The strain and phase distribution in a dissimilar friction stir weld of AA6082-T6 to AA2024-T3 is investigated non-destructively. The measurements are performed using a novel depth resolved strain and phase mapping technique. The technique is based on the use of a focussed high energy synchrotron beam, a novel spiral slit system, and an area detector system. Through thickness measurements of the residual strain along the weld centre show strong variations with changes of sign. The strain scans across the weld exhibit a strong asymmetry in particular for the longitudinal strain component. A depth resolved strain mapping across the weld shows for the dominant longitudinal strain component variations in depth, especially on the AA6082 side of the weld. Results from the strain measurements are related to the depth resolved map of the material distribution in the weld zone.
Acknowledgements
This work has been supported by the European Community in the framework of the project: Joining Dissimilar Materials and Composites by Friction Stir Welding (Join-DMC). The authors wish to thank the project partners, in particular for providing the samples. The authors acknowledge the support from ESRF staff.
Notes
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