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Ultrasonic Testing Flashcards

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

Read the first 7 Ultrasonic Testing flashcards as text

  1. What phenomenon is exploited when using Lamb waves (plate waves) in ultrasonic testing?

    Answer: Guided wave propagation through the entire thickness of thin plate structures

    Lamb waves are guided waves that propagate through the full thickness of thin plates or shells, making them effective for long-range screening of large plate areas from a single probe position.

  2. In ultrasonic contact testing, what defect orientation is most difficult to detect with a standard normal-beam (0°) transducer?

    Answer: Planar flaws oriented at 45° or parallel to the beam path

    Planar flaws whose faces are parallel to the beam path (vertical cracks) reflect little energy back to a normal-beam transducer, requiring angled beams for reliable detection.

  3. What does the term 'signal-to-noise ratio' (SNR) mean in the context of ultrasonic testing?

    Answer: The ratio of flaw signal amplitude to the background material noise level

    SNR compares the flaw echo amplitude to the background 'grass' or noise level; a high SNR means the flaw signal clearly stands out from background noise, enabling reliable detection.

  4. When performing ultrasonic thickness measurement on a corroded pipe, which technique is best suited to measure minimum remaining wall thickness through internal corrosion pitting?

    Answer: Multiple-echo technique (echo-to-echo measurement) to ignore coating thickness

    The multiple-echo (echo-to-echo) technique measures between successive back-wall echoes rather than from the front surface, eliminating the influence of coatings or surface irregularities.

  5. In full matrix capture (FMC) phased array UT, what data is collected compared to conventional PAUT?

    Answer: The complete A-scan from every transmitter-receiver element combination

    FMC collects a complete A-scan for every possible transmitter-receiver element pair combination, enabling post-acquisition reconstruction (TFM) and far superior imaging flexibility.

  6. What is the purpose of the 'reject' (suppression) control on a conventional UT flaw detector?

    Answer: To eliminate low-level noise and 'grass' from the A-scan display

    The reject (suppression) control clips low-amplitude signals below a set threshold from the display to reduce noise; however, it can also suppress small flaw signals if set too high.

  7. According to SNT-TC-1A, which level of UT certification is authorized to establish written procedures for ultrasonic examination?

    Answer: Level III

    SNT-TC-1A Level III personnel are qualified to establish, review, and approve NDT procedures, methods, and techniques for their certified methods.