NDE Methods and Symbols 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 NDE Methods and Symbols flashcards as text
Which NDE symbol on a weld drawing indicates that liquid penetrant testing should be performed?
Answer: PT
PT is the AWS standard abbreviation for liquid penetrant testing used in NDE symbols on weld drawings.
In ultrasonic testing, what does the term 'dead zone' refer to?
Answer: The region near the transducer face where defects cannot be detected
The dead zone is the area directly beneath the transducer where ringing from the initial pulse masks any near-surface reflections.
Which type of radiographic film has the finest grain size and highest resolution but requires longer exposure times?
Answer: Class I (fine grain)
Class I fine-grain films produce the highest resolution images but require longer exposures because they are less sensitive to radiation.
When performing magnetic particle testing, what is the purpose of the 'residual method'?
Answer: Testing is done after the magnetizing force is removed, relying on retained magnetism
The residual method applies particles after removing the magnetizing force, and works only on materials with sufficient residual magnetism (high retentivity).
In liquid penetrant testing, what is the correct sequence of steps?
Answer: Precleaning → Penetrant application → Dwell time → Excess removal → Developer → Inspection
The correct LP sequence is precleaning, penetrant application, dwell time, removal of excess penetrant, developer application, then inspection.
On a weld NDE symbol, where is the arrow-side designation placed relative to the reference line?
Answer: Below the reference line
Per AWS A2.4, NDE requirements placed below the reference line apply to the arrow side of the joint.
What is the primary advantage of phased array ultrasonic testing (PAUT) over conventional UT?
Answer: The beam angle and focus can be electronically steered without moving the probe
PAUT uses multiple elements fired in sequence with controlled time delays, allowing electronic beam steering and focusing without mechanical probe movement.