CRI Material Properties & Testing Standards 3

Question 1

A material's ability to absorb energy up to fracture without failing is called:

Accepted Answer

Toughness

Answer

Toughness is the total energy absorbed per unit volume up to fracture, represented by the area under the stress-strain curve.

Question 2

Which welding discontinuity is characterized by incomplete coalescence between the weld metal and the base metal fusion faces?

Accepted Answer

Lack of fusion

Answer

Lack of fusion is the absence of metallurgical bond between weld metal and base metal at the fusion zone.

Question 3

The IQI (image quality indicator) sensitivity is expressed as:

Accepted Answer

The wire diameter or hole diameter visible as a percentage of part thickness

Answer

IQI sensitivity = (smallest visible wire or hole size / part thickness) × 100%, indicating the minimum detectable feature size.

Question 4

Carbon equivalent (CE) is used primarily to predict:

Accepted Answer

Susceptibility to hydrogen-induced cracking

Answer

Carbon equivalent formulas estimate hardenability and risk of hydrogen cracking in the heat-affected zone.

Question 5

Which type of crack typically initiates at the toe of a weld and runs parallel to the weld bead?

Accepted Answer

Toe crack

Answer

Toe cracks form at the weld toe due to stress concentration and hydrogen embrittlement in the HAZ.

(CRI) Certified Radiographic Interpreter Practice Test