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Fluorescent penetrant inspection (FPI) system is a type of dye penetrant inspection in which a fluorescent dye is applied to the surface of a non-porous material in order to detect defects that may compromise the integrity or quality of the part in question.
FPI is noted for its low cost and simple process, and is used widely in a variety of industries. There are many types of dye used in penetrant inspections. FPI operations use a dye much more sensitive to smaller flaws than penetrants used in other DPI procedures.
This is because of the nature of the fluorescent penetrant that is applied. With its brilliant yellow glow caused by its reaction with ultraviolet radiation, FPI dye sharply contrasts with the dark background.
A vivid reference to even minute flaws is easily observed by a skilled inspector. Because of its sensitivity to such small defects, FPI is ideal for most metals which tend to have small, tight pores and smooth surfaces. Defects can vary but are typically tiny cracks caused by processes used to shape and form the metal.
It is not unusual for a part to be inspected several times before it is finished (an inspection often follows each significant forming operation). Selection of inspection type is, of course, largely based on the material in question.
FPI is a nondestructive inspection process and is therefore important that a dye and process are selected that ensure the part is not subjected to anything that may cause damage or staining.
The Global Fluorescent Penetrant Inspection system market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
Magnetic NDT Systems Fluorescent Penetrant Inspection Equipment Fluorescent Penetrant inspection is a widely applied method used to locate surface-breaking defects in all non-porous materials (metals, plastics, or ceramics).
FPI is used to detect casting and forging defects, cracks, and leaks in new products, and fatigue cracks on in-service components.
FPI is based upon capillary action, where low surface tension fluid penetrates into clean and dry surface-breaking discontinuities. Penetrant may be applied to the test component by dipping, spraying, or brushing.
After adequate penetration time has been allowed, the excess penetrant is removed, and a developer is applied. The developer helps to draw penetrant out of the flaw where a visible indication becomes visible to the inspector. Inspection is performed under ultraviolet light.
