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Nondestructive Examination Methods Flashcards

7 cards from real CWI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Nondestructive Examination Methods flashcards as text

  1. Which NDE method is most effective for detecting subsurface discontinuities in a thick steel weld?

    Answer: Ultrasonic testing

    Ultrasonic testing can detect both surface and subsurface discontinuities at significant depths in steel welds.

  2. In ultrasonic testing, what does the term 'dead zone' refer to?

    Answer: Region near the transducer face where near-surface defects cannot be detected

    The dead zone is the region immediately beneath the transducer face where the ringing of the crystal prevents detection of echoes from near-surface reflectors.

  3. What is the main advantage of using fluorescent penetrant over visible dye penetrant?

    Answer: Greater sensitivity due to high contrast under UV light

    Fluorescent penetrant produces a bright glow under UV (black) light, providing significantly higher contrast and sensitivity compared to visible dye penetrant.

  4. A magnetic particle test is being performed on an austenitic stainless steel weld. Which statement is correct?

    Answer: MT is not applicable because austenitic stainless steel is non-ferromagnetic

    Austenitic stainless steels are non-ferromagnetic and cannot be magnetized, making MT inapplicable.

  5. In radiographic testing, which IQI type shows a series of wires of decreasing diameter?

    Answer: Wire-type IQI

    Wire-type IQIs (also called wire penetrameters) consist of a set of wires of different diameters to indicate radiographic sensitivity.

  6. When conducting an eddy current test on a ferromagnetic material, what is often done to improve sensitivity?

    Answer: Saturate the material with a DC magnetic field

    DC magnetic saturation suppresses the high magnetic permeability of ferromagnetic materials, reducing permeability noise and improving eddy current sensitivity.

  7. Which type of weld discontinuity would be LEAST likely to be detected by magnetic particle testing?

    Answer: Subsurface crack at 6 mm depth

    MT sensitivity decreases rapidly with depth; a subsurface crack at 6 mm is typically beyond the effective detection depth of MT.