T.O. 33B-1-15-72Figure 5-71. Pulse-Echo Method.5.4.5.2.2This method can detect near-skin-to-core unbonds and broken or corroded core. Unbonds will cause a complete loss ofthe signal from the back of the core (Figure 5-71, View B). Broken or corroded core will reduce or completelyeliminate the signal from the back of the core and may produce an echo signal (Figure 5-71, View C).
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