What should a part be cleaned with before undergoing dye penetrant inspection?

Before undergoing dye penetrant inspection, it is crucial to ensure that the part is cleaned thoroughly to avoid any contaminants that could interfere with the process. While several cleaning agents might be effective, the most appropriate choice is a volatile petroleum-base solvent.

This type of solvent is effective at removing oils, greases, and other contaminants that could prevent the dye penetrant from entering any surface cracks or defects. The volatility of petroleum-based solvents ensures that they evaporate quickly, leaving minimal residue on the surface. A clean part is essential for accurate detection of discontinuities, as any residual dirt or contaminants could trap the dye and lead to false readings or missed defects.

Other options may not provide the same level of efficacy against certain types of contaminants or may leave residues that could interfere with the inspection process. For example, alcohol-based cleaners and aqueous detergents may not be as effective on heavy oils or greases, while chlorinated solvents could present environmental and safety concerns, making them less favorable in many circumstances. Therefore, using a volatile petroleum-base solvent is the best practice for preparing a part for dye penetrant inspection.