penetranttarkastus
Penetranttarkastus, also known as liquid penetrant inspection (LPI), is a widely used non-destructive testing (NDT) method for detecting surface-breaking defects in solid materials. The technique relies on the principle that a liquid penetrant can enter open defects, such as cracks, porosity, or voids, due to capillary action. Once the penetrant is introduced to the surface, it is allowed to dwell for a sufficient period to ensure full penetration into any defects. Afterward, the excess penetrant is removed, and a developer is applied to draw the penetrant out of the defects, making them visible under appropriate lighting.
Penetranttarkastus is particularly effective for detecting fine surface cracks and discontinuities in non-porous materials such as
The process involves three main steps: application of the penetrant, removal of excess penetrant, and application
Penetranttarkastus offers several advantages, including simplicity, cost-effectiveness, and the ability to detect very small defects. However,