3.4.3. Exit Zone

The region where the tool exits the weld provides a unique opportunity to examine the location of flow features without the complication of the packing and deposition that occurs elsewhere in the weld. The surface and subsurface (approximate depth of 0.5 mm) results for this region is shown in Figure 12.

The tentative explanation is that this region shows the combined effect of smeared flow patches from the shoulder (to the left of Figure 12b), and the flow patches from the pin (centre-right of Figure 12b). In between the two there appears to be a region of disturbed flow.
