Certified Welder Weld Inspection and Testing 3

Question 1

What type of weld defect is identified by a groove melted into the base metal at the edge of a weld bead?

Accepted Answer

Undercut

Answer

Undercut is a groove or channel melted into the base metal along the weld toe, reducing the effective cross-section.

Question 2

A Charpy V-notch test primarily evaluates which mechanical property of a weld?

Accepted Answer

Toughness (impact resistance)

Answer

The Charpy V-notch test measures the energy absorbed by a notched specimen when struck by a pendulum, indicating toughness.

Question 3

In magnetic particle testing (MT), what is the correct sequence for wet fluorescent MT?

Accepted Answer

Magnetize, apply particles, view under UV light

Answer

The correct MT sequence is magnetize the part first, then apply the magnetic particle medium, then view under UV (black) light.

Question 4

Which weld discontinuity is most likely caused by welding over a contaminated or painted surface?

Accepted Answer

Porosity

Answer

Porosity is commonly caused by gas trapped in the weld pool from contaminants such as oil, paint, moisture, or rust on the base metal.

Question 5

When performing a guided bend test, the face bend tests for:

Accepted Answer

Surface and near-surface defects on the weld face

Answer

A face bend test bends the specimen with the weld face in tension, revealing surface and near-surface defects on the crown side.

Certified Welder Practice Test