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Solution: Dye Penetrant Inspection (PT)

Testing & Inspection

Solution: Dye Penetrant Inspection (PT)

TÜV AUSTRIA BELGIUM - Team Non Destructive Testing

Region: Belgium

Wingepark 41 3110 Rotselaar Belgium

+32 2 532 29 11

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TÜV AUSTRIA BELGIUM - Team Non Destructive Testing

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Penetration testing PT

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"Dye penetrant inspection (DP), liquid penetrate inspection (LPI) or penetrant testing (PT), is a widely applied inspection method used to check surface."

Dye penetrant inspection (PT), also called liquid penetrate inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). The penetrant may be applied to all non-ferrous materials and ferrous materials, although for ferrous components magnetic-particle inspection is often used instead for its subsurface detection capability. LPI is used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity, leaks in new products, and fatigue cracks on in-service components.

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).

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Brightness contrastsBrushCapillary actionCavityCracksDye penetrant testingDye solutionEindringprüfungImmersionIndustryMaterialMaterial separationNDTNon-destructive testing (NDT)PenetrantPenetration propertiesPTSolventSpray onSurfaceSurface defectZerstörungsfreie Prüfung

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