CWI Destructive Testing and Properties 4

Question 1

A side bend test is most commonly used for:

Accepted Answer

Thick plate welds to evaluate through-thickness soundness

Answer

Side bend tests are typically required for base metal thicknesses 3/8 inch (10 mm) and greater to examine the full through-thickness cross-section.

Question 2

What does a Charpy test temperature requirement primarily protect against?

Accepted Answer

Brittle fracture at low or sub-zero service temperatures

Answer

Charpy testing at specified minimum temperatures verifies that the material retains adequate toughness to resist brittle fracture in cold service conditions.

Question 3

In a fillet weld break test, which discontinuity would be considered a failure?

Accepted Answer

Incomplete fusion at the root

Answer

Incomplete fusion at the root is a rejectable defect revealed by the fillet weld break test because it compromises load-carrying capacity.

Question 4

What is the gauge length used to calculate percent elongation typically related to?

Accepted Answer

The cross-sectional area or a fixed multiple of the specimen diameter

Answer

Gauge length is standardized relative to specimen cross-section, commonly 2 inches for flat specimens or 4× or 5× the diameter for round specimens.

Question 5

Which property describes a material's ability to absorb energy during plastic deformation before fracturing?

Accepted Answer

Toughness

Answer

Toughness is the ability to absorb energy and plastically deform without fracturing, represented by the area under the stress-strain curve.

CWI Practice Test

CWI Practice Test

CWI Destructive Testing and Properties 4