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Fig. 6

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The microstructure of the spot weld produced at 10 s; A3: 600 rpm at 10 s, B3: 900 rpm at 10 s, C3: 1200 rpm at 10 s A4: 600 rpm at 15 s, B4: 900 rpm at 15 s, C4: 1200 rpm at 15 s (at 200× magnification).
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