Certified Welder Weld Inspection and Defects 2

Question 1

Which destructive test is used to evaluate the ductility and soundness of a weld by bending the specimen around a mandrel?

Accepted Answer

Guided bend test

Answer

The guided bend test bends a weld specimen around a mandrel of specified diameter to reveal surface cracks, lack of fusion, and porosity.

Question 2

Lamellar tearing in a weld joint is most commonly caused by:

Accepted Answer

High sulfur content in base metal and through-thickness loading

Answer

Lamellar tearing occurs in base metal with low through-thickness ductility (often due to sulfide inclusions) when restrained welds apply stress in the Z-direction.

Question 3

What does the term 'lack of sidewall fusion' specifically describe?

Accepted Answer

Incomplete fusion between the weld metal and the groove face of the base metal

Answer

Lack of sidewall fusion means the weld metal did not bond properly to the vertical groove faces of the base material on either side of the joint.

Question 4

During radiographic testing, a linear indication parallel to the weld axis most likely represents:

Accepted Answer

Longitudinal crack or lack of fusion

Answer

Linear indications aligned with the weld axis on a radiograph typically indicate longitudinal cracks or planar lack-of-fusion defects.

Question 5

Which weld discontinuity is most likely detected by magnetic particle testing but NOT by liquid penetrant testing?

Accepted Answer

Subsurface crack just below the surface

Answer

Magnetic particle testing can detect near-surface subsurface discontinuities, while liquid penetrant testing is limited strictly to surface-open defects.

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Certified Welder Weld Inspection and Defects 2