How many exposures are adequate for the radiographic inspection of a complete weld when the radiographic source is centered in the pipe?

For radiographic inspection of a complete weld, one exposure is generally considered adequate when the radiographic source is centered in the pipe. This approach maximizes the effectiveness of the exposure, allowing for a comprehensive evaluation of the weld quality and potential defects.

When the source is properly centered, the radiographic film captures a clear image of the entire weld area in a single shot. This method minimizes the time and resources needed for inspection, as well as reduces the exposure to radiation for personnel involved in the process. Utilizing a single exposure streamlines workflow in contexts where efficiency is crucial, such as in pipeline construction or inspection.

Other options suggest multiple exposures, which may not be necessary when the source is effectively centered, as the resulting image can adequately display the integrity of the weld. Therefore, one exposure is sufficient to ensure a thorough assessment of the weld integrity under these specific conditions.