What type of defects can a fluorescent penetrant test detect?

Fluorescent penetrant testing is specifically designed to detect surface-breaking defects in non-porous materials. It works by applying a fluorescent dye that seeps into any surface cracks or discontinuities. After allowing the penetrant to dwell and then cleaning the surface, a developer is applied, which draws the penetrant out of the flaws and creates an easily observable indication under ultraviolet light. This method is effective for identifying cracks, voids, and other similar defects that are visible at the surface level.

Surface-breaking defects are critical because they can significantly impact the integrity and performance of a material or component. Since the penetrant test does not penetrate deeply into the material, it does not reveal defects located far beneath the surface. Thus, it is precise in its ability to highlight issues that endanger the safety and reliability of the components being tested.