What is the penetration time in penetrant testing?

What is the penetration time in penetrant testing?

• A. The time to rinse
• B. The time allowed for penetrant to enter discontinuities
• C. The time to dry
• D. The time to develop

Answer: (B)

Penetration time is the dwell period during which penetrant is left on the surface to enter any cracks or discontinuities by capillary action. This step ensures the penetrant has enough opportunity to seep into defects before any surface is cleaned. The duration is set by the inspection procedure and depends on factors like the penetrant type, material, surface condition, and temperature. After this time, the excess penetrant is removed (rinse), the part is dried, and then development and inspection follow.

Penetration time is the dwell period during which penetrant is left on the surface to enter any cracks or discontinuities by capillary action. This step ensures the penetrant has enough opportunity to seep into defects before any surface is cleaned. The duration is set by the inspection procedure and depends on factors like the penetrant type, material, surface condition, and temperature. After this time, the excess penetrant is removed (rinse), the part is dried, and then development and inspection follow.