Abstract
This paper focuses on the microstructure evolution and the relationship to the microhardness profiling of the friction stir welded butt joint on similar AA6061-T6 Aluminium alloys. The only parameters used and varied for this study were rotational speed and feed rate. The geometry of the tool was kept constant and the material used was tool steel, W302. Friction stir welds were evaluated by both visual inspection and the X-ray digital radiography method. Evaluation allowed for assessment of the weld integrity by examining for the presence and absence of weld defects. The results indicated that the welds do not have any root defects. The X-rays showed complete penetration as evidenced by the evaluation of microstructural joint interface.
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