Fig. 5

(a) Macrograph of the AA6061-T6 FSLW&FSP cross section with white rectangles indicating typical regions; a magnified view (b) in (a), (c) and (d) in (b); (e) a magnified view of the defect at RS in (a).

(a) Macrograph of the AA6061-T6 FSLW&FSP cross section with white rectangles indicating typical regions; a magnified view (b) in (a), (c) and (d) in (b); (e) a magnified view of the defect at RS in (a).