Mechanical Properties and Electrical Resistivity of the Friction Stir Spot-Welded Dissimilar Al–Cu Joints

Figure 4

(a) Microstructure of the spot weld using SEM (1000 rpm, 1 s and 0.5 mm plunge depth). (b) Microstructure of the spot weld using SEM (1400 rpm, 1 s, and 0.5 mm plunge depth).

(a)

(b)