Figure 5-59. Example of Multiple Indications and Decrease in Multiple Back Reflections Caused by Large Grain Size or Porosity

Figure 5-60. Effect of Delaminations in a Plate on Multiple Back Surface Signals

TM-1-1500-335-23 Nondestructive Inspection Methods Manual
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T.O. 33B-1-1 5-55 Figure 5-59. Example of Multiple Indications and Decrease in Multiple Back Reflections Caused by Large Grain Size or Porosity. 5.3.6.5.2 Delaminations. When inspecting either metal parts fabricated from sheet or plate, or nonmetallic composite parts, delaminations can be detected by noting what appears to be a reduction in the distance between back reflection multiples as shown in Figure 5-60. Actually the signals indicate multiple echoes from the delamination instead of the back surface.

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