LIQUID PENETRANT TESTING (LPT) :
Dye penetrant inspection (DPI), also called liquid penetrant inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to locate 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.
This Test method covers procedures for penetrant testing of butt and fillet weld with the associated Heat Effected Zone (HAZ) on the parent metal and components. They are non-destructive testing methods for detecting discontinuities that are open to the surface such as cracks, porosity and lack of fusion by liquid penetrant testing conducted in accordance with the requirements of the referenced Codes and Standards.
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