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Flashcards in Article - 5 (UT) Deck (15):
1

Measuring Thickness:
measuring the thickness of materials using the contact pulse-echo method at temperatures not to exceed ___

93°C [200°F]

2

Measuring Thickness:
One block should have a thickness value near the _________ of the range of interest and another block near the _________ thickness.

maximum
minimum

3

Measuring Thickness:
Use at least _____standardization blocks

two

4

High-temperature materials, up to about ______ , can be measured with specially designed instruments with high-temperature compensation, search unit assemblies, and couplants.

540°C [1000°F]

5

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].

6

SE-797 provides guide lines for the ____________method for measuring thickness.

contract pulse echo

7

A pulse echo instrument measures the ______ of the ultrasonic pulse through the part.

transit time

8

Reference blocks used to calibrate equipment should have an ultrasonic velocity:

The same as the piece to be tested

9

Which is not a type of thickness measurements instrument?

Flaw detectors with A-scan floor scan pressure readout

10

For measuring thin sections which type of search unit is generally used?

highly damped, high frequence

11

When using a direct contact,single element search unit the display start is

syncronized to the initial pulse

12

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

13

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?

2

14

When using dual search units there is an inherent error due to the:

Vee path that the sound beam travels

15

When measuring materials at high temperatures the reading are high by a factor of:

1% per 100 F