AWS Destructive & Non-Destructive Testing 3

Question 1

What NDT method is most effective for detecting subsurface laminar discontinuities in steel plate?

Accepted Answer

Ultrasonic testing

Answer

Ultrasonic testing can detect internal planar and laminar flaws through the full thickness of steel plate, which surface methods cannot reach.

Question 2

A Charpy V-notch impact test evaluates which mechanical property of a weld or base metal?

Accepted Answer

Toughness (notch impact energy)

Answer

The Charpy V-notch test measures absorbed energy during fracture, quantifying toughness and transition temperature behavior.

Question 3

In magnetic particle testing, a circular magnetization technique is best suited for detecting which flaw orientation?

Accepted Answer

Longitudinal cracks parallel to the current flow

Answer

Circular magnetization creates flux lines encircling the conductor, making it most sensitive to longitudinal (axial) discontinuities.

Question 4

Which destructive test is specifically designed to assess the ductility of a weld by wrapping the specimen around a fixed-radius die?

Accepted Answer

Guided bend test

Answer

The guided bend test bends the weld specimen around a plunger of specified radius to reveal cracks and evaluate ductility and fusion.

Question 5

An IQI (image quality indicator) in radiographic testing is used to verify:

Accepted Answer

The sensitivity and quality of the radiographic image

Answer

The IQI (penetrameter) demonstrates that the radiographic technique has sufficient sensitivity to detect discontinuities of a specified size.

AWS Practice Test