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25 Cards in this Set
- Front
- Back
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What are the 2 general classification of material testing methods ? |
A. Destructive testing B. Non-Destructive |
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Of the five most common NDT testing methods, which one requires no training ? |
Visual |
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Disadvantages of liquid penetrant inspection are: |
A. Smooth parts only, - temperature sensitive. |
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Dye penetrant can be used on wide variety of materials ( glass, plastic )
True or false |
True |
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LPT inspection method requires the discontinuities exposed to the surface must be free from oil, water or other contaminants for at least ____________ (distance) beyond the area being inspected. |
25mm (1") |
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What type of liquid penetrant inspection requires the use of ultra- violet light source ? |
Fluorescent dye penetrant inspection |
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While performing liquid penetrant examination, dwell time is required after which step ? |
After you apply the penetrating liquid |
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Explain how liquid penetrant can be used to test for leaks in vessels or tanks. |
Apply penetrant on the inside, if it comes through it means you have a crack. |
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Magnetic particle inspection can detect surface a sub-surface discontinuities.
True or false |
True
Up to 1/4" depth |
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Thin coating of paint or plating has no effect on the quality of the inspection.
True or false |
False |
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Magnetic particle inspection is used for locating discontinuities in ferromagnetic materials. Which type of power source is used for subsurface discontinuities ?
AC or DC |
DC |
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When using magnetic particle, to what depth can these defects be discovered ? |
Up to 1/4" |
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How should the magnetic field be oriented with suspected defects ? |
90 degrees to the direction of the defect. |
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List the two Rays used in radiography. |
A. X-Ray B. Gamma ray |
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How is the quality of a radiograph measured ? |
A penetrameter is used. |
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Discontinuity inside a weld will show up on radiography film:
Lighter or darker |
Darker |
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What are two common criteria used to measure the quality of the radiograph ? |
A. Contrast - different degree of darkening on the film
B. Definition - Sharpness which the image is projected. |
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What is the name of the source shielding container ? |
Camera |
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What are two main types of ultrasonic waves used for testing welds ? |
A. Shear waveforms
B. Longitudinal |
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What produces ultrasonic waves or vibrations ? |
applying electric pulses to a crystal |
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What allows the ultrasonic waves to transfer from the transducer into the test piece instead of reflecting back into the transducer from the surface of the work ? |
Couplant ( Gel substance or oil water |
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Ultrasonic can be used to depths of about _________ In axial inspection of shafts.
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20' |
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Eddy current testing is ideal for testing ______________ material that are non-magnetic. |
Conductive |
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An advantage of eddy current testing is the ability to detect surface and subsurface defects.
True or false |
True |
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One of the main advantages of eddy current when inspecting hollow tubing found in heat exchangers ? |
The speed of the inspection. |
