CRI Radiographic Film Interpretation 2

Question 1

On a weld radiograph, a linear indication running parallel to the weld axis and located at the weld toe is most likely which discontinuity?

Accepted Answer

Undercut

Answer

Undercut appears as a dark linear indication at the weld toe, parallel to the weld axis, caused by melting of the base metal during welding.

Question 2

Which radiographic technique factor most directly controls the density (overall blackening) of a film?

Accepted Answer

Milliampere-seconds (mAs)

Answer

Milliampere-seconds (mAs) controls the quantity of radiation and therefore the overall film density.

Question 3

A radiograph shows a cluster of small, rounded dark spots scattered throughout the weld. This is most characteristic of:

Accepted Answer

Porosity

Answer

Scattered rounded dark spots are the classic radiographic appearance of gas porosity trapped in the weld metal.

Question 4

When using the double-wall single-image (DWSI) technique on pipe, the source is positioned:

Accepted Answer

Outside the pipe, with film on the opposite side

Answer

In DWSI, the source is outside the pipe and the film is placed on the diametrically opposite outside surface, imaging only the near wall of the weld.

Question 5

The term 'radiographic sensitivity' refers to:

Accepted Answer

The minimum detectable discontinuity size as a percentage of material thickness

Answer

Radiographic sensitivity is the ability to detect the smallest significant discontinuity, expressed as a percentage of the section thickness.

(CRI) Certified Radiographic Interpreter Practice Test