Question

The length of the total area tested by TOFD is 19.7in (500mm), but the data collected only covers 19.3in (490mm). The most likely reason for this discrepancy is:

A) scan speed too slow
B) use of couplant
C) uneven shape of the test object
D) improper synchronization of the encoder

Answer 1

The most likely reason for the discrepancy between the length of the total area tested by TOFD and the length of the data collected is the scan speed being too slow.

Step-by-step explanation:

The most likely reason for the discrepancy between the length of the total area tested by TOFD and the length of the data collected is the scan speed being too slow.

TOFD (Time of Flight Diffraction) is an ultrasonic testing method that measures the time it takes for sound waves to travel through a material and reflect back. A slow scan speed could result in not covering the entire area, leading to a shorter data collection length. Other factors like the use of couplant, uneven shape of the test object, and improper synchronization of the encoder can also cause discrepancies, but the most likely reason in this case is the scan speed.