Cutting oils may be effectively removed from parts before penetrant testing by

Cutting oils may be effectively removed from parts before penetrant testing by

• A. Water rinse
• B. Vapor degreasing
• C. Solvent clean
• D. Air blow-off

Answer: (B)

Surface cleanliness is crucial for penetrant testing because oily residues prevent the penetrant from properly wetting the surface and can mask or mimic defects. Cutting oils are hydrocarbons that are efficiently removed by vapor degreasing, which exposes a clean, dry surface ready for penetrant. In vapor degreasing, solvent vapor condenses on the part and dissolves oils, lifting them away without leaving water-based residues. Water rinses don’t effectively remove hydrocarbon oils; air blow-off only removes surface liquid, not the oil; while solvent cleaning can remove oil, it involves handling and drying steps. Therefore, vapor degreasing provides thorough oil removal and a reliable subsequent penetrant inspection.

Surface cleanliness is crucial for penetrant testing because oily residues prevent the penetrant from properly wetting the surface and can mask or mimic defects. Cutting oils are hydrocarbons that are efficiently removed by vapor degreasing, which exposes a clean, dry surface ready for penetrant. In vapor degreasing, solvent vapor condenses on the part and dissolves oils, lifting them away without leaving water-based residues. Water rinses don’t effectively remove hydrocarbon oils; air blow-off only removes surface liquid, not the oil; while solvent cleaning can remove oil, it involves handling and drying steps. Therefore, vapor degreasing provides thorough oil removal and a reliable subsequent penetrant inspection.