CRI Acceptance Criteria & Discontinuity Evaluation Flashcards

What term describes the distance over which density changes from the indication to the background on a radiographic image?

Answer: Gradient

Gradient describes the rate of density change at an indication boundary and determines how sharply the indication edge is defined.

A 'burn-through' in a weld radiograph is identified by which image characteristic?

Answer: An isolated very dark (high density) rounded or elongated area at the weld root

Burn-through appears as a very dark high-density area at the root because excess penetration creates a void or depression that allows more radiation through.

Per AWS D1.1, undercut adjacent to a statically loaded groove weld in base metal 1 inch thick is acceptable up to what maximum depth?

Answer: 1/32 inch (0.8 mm)

AWS D1.1 limits undercut depth to 1/32 inch (0.8 mm) for statically loaded structures in base metal 1 inch or greater in thickness.

Which type of porosity in a weld radiograph is most associated with a contaminated electrode or shielding gas failure?

Answer: Uniformly scattered porosity

Uniformly scattered porosity throughout the weld length typically results from consistent contamination sources such as moisture, oil, or shielding gas deficiency.

What distinguishes 'lack of fusion' from 'lack of penetration' in a radiographic image?

Answer: Lack of fusion appears as a dark linear indication along the fusion line rather than at the weld centerline

Lack of fusion is located at the sidewall or interpass fusion line and appears as an off-center dark line, while lack of penetration is centered at the root.

When two or more indications are separated by less than the length of the longer indication, how should they be evaluated under most code criteria?

Answer: They are treated as a single continuous indication

Most codes require that closely spaced indications separated by less than the longer indication's length be combined and evaluated as one continuous indication.