Solution: Dye Penetrant Inspection (PT)
Solution: Dye Penetrant Inspection (PT)
DPI 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 so that an invisible indication becomes visible to our inspectors. Inspection is performed under ultraviolet or white light, depending on the type of dye used – fluorescent or nonfluorescent (visible).