Reverse capillary action causes the penetrant to bleed back out from discontinuities’ forming a penetrant indication. After cleaning off excess Penetrant from the surface, only the Penetrant in the discontinuities remains. It will wet the surface properly and travels by capillary action and enters the discontinuities open to the surface and flow up and down into the opening. Without the assistance of, or even in opposition to, external forces likeĪ Penetrant made of dye and liquid when applied on a clean, dry surface. Application of the penetrant to a part in a ventilated test area īasic Principle: The principle phenomenon in liquid penetrantĬapillary action is the ability of a liquid to flow in narrow spaces The test results indicating the presence of Discontinuities not visible by unaided human eyes. It basically involves the application of Penetrant on the testing surface, allowing it on the test surface for a period of time and application of the developer after cleaning the Penetrant completely from the test surface. ![]() It is economical, versatile, and requires minimal training when compared to other NDE methods. This method is also known as dye penetration testing. Liquid penetrant testing is a versatile nondestructive test method used for the detection of OPEN TO SURFACE DISCONTINUITIES in a wide variety of solid, non-porous materials. To know more about the history of Liquid Penetrant testing read our article History of NDT. ![]() This makes liquid Penetrant testing a crucial NDT method. These non-metallic materials cannot be inspected using Magnetic Particle testing due to its process limitations. In the article Introduction to Magnetic particle Testing, we learned how efficient, Reliable and quick the NDT method it is for detecting surface and subsurface discontinuities’ still it cannot replace Dye Penetrant testing, the reason being with time more and more light non-metallic materials are used in the industry ex.
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