Investigation of the Effect of Tool Temperature on Microstructure, Hardness, and Wear Behaviour of Aluminium 6061-T6 Alloy Welded by the Friction Stir Welding Process

Figure 6

SEM micrographs of (a) 60 mm distance, (b) 120 mm distance, and (c) 180 mm distance.

(a)

(b)

(c)