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Destructive & Non-Destructive Testing Flashcards

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

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  1. Which destructive test is required by AWS D1.1 to qualify a welder using the groove weld plate test in the 3G position?

    Answer: Face and root guided bend tests

    AWS D1.1 requires face and root bend test specimens (or side bends for material ≥9.5 mm thick) to qualify groove weld performance tests.

  2. In eddy current testing, the test coil's impedance changes when it encounters a discontinuity because the discontinuity:

    Answer: Alters the induced eddy current flow in the material

    Discontinuities disrupt the eddy current paths established by the alternating magnetic field, changing the coil impedance in a measurable way.

  3. According to AWS D1.1, when is radiographic testing (RT) considered mandatory versus optional for weld qualification?

    Answer: RT can substitute for bend tests only when specified by the engineer

    AWS D1.1 allows RT to substitute for mechanical bend testing in welder qualification only when permitted by the engineer of record.

  4. A weld discontinuity described as 'wagon tracks' on a radiograph most likely represents:

    Answer: Parallel linear indications typical of incomplete fusion at the weld interfaces

    'Wagon tracks' are parallel linear radiographic indications on both sides of the weld centerline, characteristic of lack of fusion at the sidewall interfaces.

  5. In liquid penetrant testing, what is the minimum recommended dwell (penetration) time for detecting tight surface cracks in carbon steel?

    Answer: 5 to 10 minutes

    Most PT procedures specify a minimum dwell time of 5 to 10 minutes to allow sufficient penetrant to enter tight discontinuities in carbon steel.

  6. What does the term 'signal-to-noise ratio' (SNR) refer to in ultrasonic weld inspection?

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

    SNR is the ratio of the relevant flaw signal amplitude to the surrounding background noise; a high SNR indicates a clearly detectable discontinuity.

  7. A welder's performance qualification test coupon is rejected because a side bend specimen shows a corner crack exceeding 6.4 mm (1/4 in.). The most probable root cause is:

    Answer: Low base metal ductility or HAZ embrittlement

    Corner cracking on side bends often originates at the base metal edge and indicates low material ductility, brittle inclusions, or HAZ embrittlement rather than a weld technique error.