Flashcards in Article - 5 (UT) Deck (15):
measuring the thickness of materials using the contact pulse-echo method at temperatures not to exceed ___
One block should have a thickness value near the _________ of the range of interest and another block near the _________ thickness.
Use at least _____standardization blocks
High-temperature materials, up to about ______ , can be measured with specially designed instruments with high-temperature compensation, search unit assemblies, and couplants.
A rule of thumb often used is as follows: The apparent thickness reading obtained from steel walls having elevated temperatures is high (too thick) by a factor of about ________
1 % per 55°C [100°F].
SE-797 provides guide lines for the ____________method for measuring thickness.
contract pulse echo
A pulse echo instrument measures the ______ of the ultrasonic pulse through the part.
Reference blocks used to calibrate equipment should have an ultrasonic velocity:
The same as the piece to be tested
Which is not a type of thickness measurements instrument?
Flaw detectors with A-scan floor scan pressure readout
For measuring thin sections which type of search unit is generally used?
highly damped, high frequence
When using a direct contact,single element search unit the display start is
syncronized to the initial pulse
When performing a complete calibration of an instrument using a delay line single element search unit calibration blocks should be
At least two with a thickness near the maximum of the range to be measured and the other block near the minimum thickness
When calibrating a UT instrument using Case II, what minimum number of test blocks should be used when the instrument must be completely calibrated with the delay line search unit?
When using dual search units there is an inherent error due to the:
Vee path that the sound beam travels