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Enhancement of root crack detection in friction stir welds using ultrasonic non-destructive testing and signal processing technique.

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Figure

Figure 3.2.1-3 Contact Inspection and acquired A-scans from reflectors.(Figurefrom “Nondestructive Testing" by Halmshaw)
Figure 4.1.1-1 Imaging mechanism of SAM. (Figure from “Scanning Acoustic Microscopy”)
Figure 4.1.2.1-1 Single element angled beam inspection.
Figure 4.1.2.3-3 Main lobe sharpness factor vs. element spacing.
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