Liquid die penetrate

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Liquid penetrant inspection is a nondestructive testing method that reveals surface breaking flaws by bleedout of a penetrating liquid colored with a visible or fluorescent dye from the flaw. The technique is based on the ability of a liquid to be drawn into a "clean" in other words, unobstructed surface breaking flaw by capillary action. After an appropriate period of time for penetration has papsed, called the "dwell time," excess penetrant on the surface is removed and a developer applied. The developer acts as a blotter and draws the penetrant from the flaw to reveal its presence. Penetrants with a visible dyed added color contrast require sufficient white light to insure proper inspection, while penetrants with a fluorescent dye added need to be used in darkened conditions with an ultraviolet or "black light".
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Dye Penetrant Inspection Procedure

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Dye Penetrant Inspection Procedure

Dye penetrant inspection DP , 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. The oil and whiting method used in the railroad industry in the early s was the first recognized use of the principles of penetrants to detect cracks. The oil and whiting method used an oil solvent for cleaning followed by the application of a whiting or chalk coating, which absorbed oil from the cracks revealing their locations. Soon a dye was added to the liquid. By the s, fluorescent or visible dye was added to the oil used to penetrate test objects.
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Liquid Penetrant Testing

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Learn More. Learn more about why Magnaflux customers trust our liquid penetrant inspection solutions to provide superior results in detecting fine defects and cracks in ferrous and non-ferrous materials. Locate a distributor. Request a quote.
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