Which type of test would be most suitable for detecting voids or inclusions in metals?

Radiographic testing is particularly suitable for detecting voids or inclusions in metals due to its ability to provide a visual representation of internal structures through the use of penetrating radiation, such as X-rays or gamma rays. This method generates a radiographic image that reveals variations in density within the material, which can indicate the presence of voids, inclusions, or other internal discontinuities.

The effectiveness of radiographic testing in identifying these types of defects lies in its capacity to penetrate the metal and record different densities on a film or digital detector. Voids and inclusions typically represent areas of lower density compared to the surrounding material, making them distinguishable on the radiograph. The process allows for the assessment of the internal integrity of components without requiring physical alteration or access to the inside of the object being tested.

While other testing methods might identify surface discontinuities or defects, radiographic testing excels specifically at revealing internal flaws, making it the most suitable choice for detecting voids or inclusions in metals.