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The strain and phase distribution in a dissimilar friction stir weld of AA6082-T6 to AA2024-T3 is investigatednon-destructively. The measurements are performed using a novel depth resolved strain and phase mappingtechnique. The technique is based on the use of a focussed high energy synchrotron beam, a novel spiral slitsystem, and an area detector system. Through thickness measurements of the residual strain along the weldcentre show strong variations with changes of sign. The strain scans across the weld exhibit a strong asymmetryin particular for the longitudinal strain component. A depth resolved strain mapping across the weldshows for the dominant longitudinal strain component variations in depth, especially on the AA6082 sideof the weld. Results from the strain measurements are related to the depth resolved map of the materialdistribution in the weld zone.

Depth Resolved Strain and Phase Mapping of Dissimilar Friction Stir Welds Using High Energy Synchrotron Radiation