Weld Inspection & Quality Control 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.
Read the first 7 Weld Inspection & Quality Control flashcards as text
Which nondestructive testing method uses high-frequency sound waves and is most effective for detecting internal volumetric discontinuities in thick sections?
Answer: Ultrasonic testing (UT)
Ultrasonic testing uses high-frequency sound waves that can penetrate thick materials and detect internal discontinuities such as porosity, inclusions, and cracks.
What is 'lamellar tearing' and under what conditions is it most likely to occur?
Answer: A subsurface fracture in base metal caused by through-thickness stress; occurs in rolled plate with low short-transverse ductility
Lamellar tearing is a subsurface base metal failure caused by through-thickness tensile stresses acting on rolled plate with poor short-transverse ductility (due to elongated inclusions).
A radiograph shows a linear indication parallel to the weld axis running approximately 3 inches long. This is MOST likely:
Answer: Incomplete penetration
A continuous linear indication parallel to the weld axis is most characteristic of incomplete penetration (IP), where the weld root fails to fully fuse.
Which document formally authorizes a welder to produce welds in production using a specific process and material?
Answer: Welder Performance Qualification Record (WPQR)
The Welder Performance Qualification Record (WPQR) documents that the welder demonstrated adequate skill and authorizes production welding within the qualified ranges.
During visual inspection, an inspector measures the leg size of a fillet weld and finds it is 3/16 inch when the drawing calls for 1/4 inch. This is classified as:
Answer: A nonconformance requiring repair or engineering disposition
A fillet weld undersized from the required dimension is a nonconformance and must be repaired or receive an engineering disposition — it cannot be accepted as-is.
What is the primary purpose of post-weld heat treatment (PWHT)?
Answer: To relieve residual stresses and improve toughness in the weld zone
PWHT reduces residual stresses introduced by welding and can improve toughness, ductility, and dimensional stability of the weldment.
In liquid penetrant testing, what is the purpose of the 'developer' step?
Answer: To draw penetrant out of discontinuities and create a visible indication
The developer acts as a blotter to draw trapped penetrant out of discontinuities and spread it on the surface, creating a visible, enlarged indication.