Figure 6.
SEM images of microstructure of weld center in SE mode: (a) 650 W; (b) 700 W; (c) 750 W; (d) 800 W; (e) 850 W and microstructure of copper side weld area in SE mode: (f) 650 W; (g) 700 W; (h) 750 W; (i) 800 W; (j) 850 W.
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