Weld Inspection and Testing Flashcards

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

Answer: Undercut

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

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

Answer: Toughness (impact resistance)

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

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

Answer: Magnetize, apply particles, view under UV light

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

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

Answer: Porosity

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

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

Answer: Surface and near-surface defects on the weld face

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

What is 'incomplete fusion' in a weld?

Answer: A lack of bonding between weld metal and base metal or between weld passes

Incomplete fusion (lack of fusion) occurs when the weld metal fails to fuse completely with the base metal or adjacent weld passes.

Which inspection method requires the test surface to be non-porous and uses a developer to draw out indications?

Answer: Liquid penetrant testing

Liquid penetrant testing (PT) uses capillary action to draw penetrant into surface-breaking defects, then a developer draws it back out as visible indications.