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Fig. 4


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SEM images of the weld microstructure neighbouring the fusion line, (a) excluding oscillation of beam, (b) f = 50 Hz and r = 0.5 mm, (c) f = 50 Hz and r = 1 mm, (d) f = 75 Hz and r = 1 mm, BM indicates the base metal, FZ indicates the fusion zone [92], reuse with permission from Elsevier.

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