CWI Destructive Testing and Properties Questions and Answers

Question 1

Which of the following destructive tests is specifically designed to evaluate the notch toughness of a material, particularly its susceptibility to brittle fracture at various temperatures?

Accepted Answer

Charpy V-Notch Test

Answer

Tensile Test

Answer

Hardness Test

Answer

Macroetch Test

Question 2

A Procedure Qualification Record (PQR) for a groove weld on a 1-inch thick plate specifies side bend tests instead of root and face bend tests. What is the primary reason for this requirement?

Accepted Answer

The material thickness is too great for a meaningful root or face bend test.

Answer

The welding process used has a very high deposition rate.

Answer

Side bends are less expensive and faster to prepare.

Answer

The test is for a fillet weld qualification instead of a groove weld.

Question 3

A CWI performs a macroetch test on a cross-section of a fillet weld as part of a procedure qualification. Which of the following observations would be a primary focus of this examination?

Accepted Answer

The weld's profile, including depth of fusion and leg size.

Answer

The precise ultimate tensile strength of the weld metal.

Answer

The presence of microscopic cracking not visible to the naked eye.

Answer

The electrical resistivity of the heat-affected zone.

Question 4

During a transverse tensile test of a welded specimen, which of the following properties is NOT directly determined from the test data?

Accepted Answer

Impact Strength

Answer

Ultimate Tensile Strength (UTS)

Answer

Location of fracture

Answer

Ductility (via elongation)

Question 5

A welder's performance qualification test requires a nick-break test on a groove weld. What is the primary objective of this specific destructive test?

Accepted Answer

To reveal the internal soundness and fusion of the weld metal.

Answer

To measure the weld's ultimate tensile strength.

Answer

To determine the hardness of the heat-affected zone (HAZ).

Answer

To calculate the percentage of elongation for ductility.

Question 6

In the context of material properties, which statement best describes the typical relationship between hardness and toughness in the heat-affected zone (HAZ) of a carbon steel weld?

Accepted Answer

An increase in hardness, often due to rapid cooling, generally leads to a decrease in toughness.

Answer

As hardness increases, toughness always increases proportionally.

Answer

Hardness and toughness are independent properties and have no correlation.

Answer

Hardness measures resistance to impact, while toughness measures resistance to indentation.