A technique of nondestructive testing to detect surface defects in metal or plastic components. The component is soaked in a penetrating liquid and then washed to remove all penetrant from its surface. The surface is then covered with a developing powder. The powder pulls the penetrant from any defects on the surface of the component. The penetrant plainly shows up on the powder-covered surface, outlining any defective surface.
Liquid penetrant inspection (LPI) or Dye 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.
- Principle of Penetrant Testing
- Equipment Involved
- Liquid Penetrant Testing Procedures
- Evaluation of Indication
- Application of Liquid Penetrant Testing
- HAZARDS Precautions
- Code Requirements
- Review and Exercises
SSLC ,Higher Secondary/equivalent,VHSE,ITI,DIPLOMA OR Equivalent
A technique of nondestructive testing to detect surface defects in metal or plastic components.