Liquid penetrant inspection
is a widely applied to locate
surface-breaking defects in all non-porous materials (metals,
plastics, or ceramics). Penetrant may be applied to all non-ferrous
materials, but for inspection of ferrous components magnetic
particle inspection is preferred for its subsurface detection
capability. LPI is used to detect casting and forging defects,
cracks, and leaks in new products, and fatigue cracks on in-service
components.
