CRI Radiographic Film Interpretation

Question 1

What is the primary purpose of radiographic film interpretation in welding?

Accepted Answer

To detect internal weld defects nondestructively.

Answer

The primary purpose of radiographic film interpretation in welding is to detect internal weld defects non-destructively. Unlike visual inspection, radiography can reveal hidden flaws such as porosity, cracks, lack of fusion, and inclusions within the weld metal, without damaging the component. This ensures the structural integrity and quality of the weld.

Question 2

Which defect appears as a dark area on radiographic film?

Accepted Answer

Porosity.

Answer

Porosity, which consists of gas pockets or voids within the weld, appears as dark areas on radiographic film. These voids are less dense than the surrounding solid metal, allowing more X-rays or gamma rays to pass through and expose the film more heavily in those regions. This increased exposure results in a darker image on the film.

Question 3

What is the effect of weld overlap on radiographic film?

Accepted Answer

Appears as excess weld metal beyond fusion line.

Answer

Weld overlap is characterized by excess weld metal that extends beyond the fusion line without properly fusing with the base material. On radiographic film, this appears as an area of increased density (lighter) because the extra material absorbs more radiation. The answer correctly describes the visual characteristic of the defect itself as seen on the film.

Question 4

Which interpretation technique uses density variations to identify weld defects?

Accepted Answer

Radiographic interpretation.

Answer

Radiographic interpretation is a technique that specifically uses density variations to identify weld defects. X-rays or gamma rays pass through the weld, and variations in material thickness or density (e.g., due to voids or inclusions) cause differential absorption of radiation. These differences are recorded on film as varying shades of gray, allowing defects to be identified.

Question 5

How does lack of fusion appear on radiographic film?

Accepted Answer

Dark line or gap indicating poor fusion.

Answer

Lack of fusion on radiographic film appears as a dark line or gap, indicating an area where the weld metal has not properly melted and bonded with the base metal or previous weld passes. Since there is no material or poor bonding in this region, more radiation passes through, resulting in a darker indication on the film.

(CRI) Certified Radiographic Interpreter Practice Test

(CRI) Certified Radiographic Interpreter Practice Test

CRI Radiographic Film Interpretation