Liquid penetration test

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Inexpensive and easy to use, the dye sprays in liquid penetration testing can be applied to a variety of surface materials, conditions, shapes, and sizes. The applications of liquid penetrants are various and used by homeowners, inspectors of businesses and machines, machine users, and engineers to aid in checking and maintaining the efficiency and safety of structures and machines. A safety practice in place since the early Industrial Revolution, an NDT Nondestructive Testing report states that liquid penetrants such as oil and kerosene were applied to parts and machines in the early days of the railroad and airplane industry. This initial application of the liquid penetrant was followed by the application of chalk in alcohol to reveal cracks or holes in the material. The same basic process and steps are still followed though and with minimal training, employees or private individuals can begin to use liquid penetration testing sprays to perform regular inspections of important structures and equipment.
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Liquid Penetrant Test

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Liquid Penetration Testing Processes and Facts - Non-Destructive Testing (NDT) Blog

The basic principle of liquid penetrant testing is that when a very low viscosity highly fluid liquid the penetrant is applied to the surface of a part, it will penetrate into fissures and voids open to the surface. Once the excess penetrant is removed, the penetrant trapped in those voids will flow back out, creating an indication. Penetrant testing can be performed on magnetic and non-magnetic materials, but does not work well on porous materials. Penetrants may be "visible", meaning they can be seen in ambient light, or fluorescent, requiring the use of a "black" light. The visible dye penetrant process is shown in Figure 7.
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Liquid penetrant inspection

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.
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