QUICK AND EASY TECHNIQUE TO DETECT SURFACE BREAKING DISCONTINUITY
Liquid penetrant testing, also known as dye penetrant inspection (DPI) or liquid penetrant inspection (LPI) is one of the most common and affordable solution and one of the oldest, if compared to non-destructive testing inspection history.
Liquid Penetrant uses the property of capillary action to find surface-breaking discontinuities in a variety of materials. Penetrant testing uses a low viscosity liquid (penetrant) that is applied to the surface of a test piece.
Liquid Penetrant Inspection uses this capillary action to allow the penetrant to enter into fissures and voids that are open to the surface. After a dwelling time, the excess penetrant is removed and a developer is applied, any remaining penetrant in the voids will flow back out, exposing the indication.
