NDT Weld Inspection & Evaluation

Question 1

Which weld discontinuity is characterized by an unfused area between the weld metal and base metal along the weld toe?

Accepted Answer

Lack of fusion

Answer

Lack of fusion occurs when the weld metal fails to fuse completely with the base metal or adjacent weld passes, creating a planar discontinuity at the weld toe or between passes.

Question 2

According to AWS D1.1, which visual weld inspection criterion applies to undercut in a statically loaded structure?

Accepted Answer

Undercut shall not exceed 1/16 inch in depth

Answer

AWS D1.1 permits undercut up to 1/16 inch (1.6 mm) in depth for statically loaded structures, while cyclically loaded structures have stricter limits.

Question 3

What is the primary purpose of a weld profile gauge during visual inspection?

Accepted Answer

Verifying weld bead geometry and throat dimensions

Answer

A weld profile gauge is used to measure weld geometry parameters such as fillet weld leg size, convexity, concavity, and throat dimensions to confirm they meet specification requirements.

Question 4

Which type of weld crack propagates parallel to the weld axis along the centerline of the weld bead?

Accepted Answer

Longitudinal crack

Answer

Longitudinal cracks run parallel to the weld axis and can occur in the weld metal or heat-affected zone, often caused by high restraint or improper bead-to-bead ratios.

Question 5

In a butt weld inspection, what does the term 'reinforcement' refer to?

Accepted Answer

Weld metal extending above the base metal surface

Answer

Weld reinforcement is the extra weld metal deposited above the plane of the base metal surface; codes limit its maximum height to prevent stress concentrations.

(NDT) Boilermaker Nondestructive Testing Certification Practice Test

(NDT) Boilermaker Nondestructive Testing Certification Practice Test

NDT Weld Inspection & Evaluation