- Cleaning the surface (1)
- Adding the first chemical liquid (penetrant) (3) where it goes through to the crack (2)
- Cleaning the surface once more. Though, some of the first chemical remains inside of the crack
- Adding the second chemical liquid (developer) (4), where the first liquid (5) penetrate to the second, so that the area of the crack will be shown to our eyes in a bigger scale
Dye Penetrant Examination is mainly used for clad layer, welds and heat affected zones. Penetrant inspection can be used on any solid material. It is essential that the material is carefully cleaned first; otherwise the penetrant will not be able to get into the flaw. If surface penetrant is not fully removed, misleading indications will result.
An examples I found in the youtube... Check it out!