Liquid Penetrant Testing Level 1 (PT-1) Practice Exam

How can cutting oils be effectively removed from parts before penetrant testing?

1. Hand wiping

2. Water rinsing

3. Vapor degreasing

4. Sandblasting

The correct answer is: Vapor degreasing

Vapor degreasing is an effective method for removing cutting oils from parts before penetrant testing due to its ability to thoroughly clean the surface of components without causing damage. This process utilizes a solvent that evaporates at low temperatures, allowing it to condense on the cooler surfaces of the parts. The condensed solvent effectively dissolves and removes contaminants like cutting oils and greases, leaving the surface clean and ready for the penetrant application. This method is advantageous in situations where the integrity of the part needs to be maintained, as it does not involve abrasive techniques or chemicals that might leave residues. Furthermore, vapor degreasing is especially useful for complex geometries and intricate designs where traditional cleaning methods may not penetrate effectively. This ensures that all potential defects can be accurately detected during the penetrant testing process, making it a preferred choice for preparing parts in non-destructive testing.