Liquid Penetrant uses the property of capillary action to find surface-breaking discontinuities in a variety of materials. Penetrant testing uses a low viscosity liquid (penetrant) that is applied to the surface of a test piece. Liquid Penetrant Inspection uses this capillary action to allow the penetrant to enter into fissures and voids that are open to the surface. After a dwelling time, the excess penetrant is removed, any remaining penetrant in the voids will flow back out, exposing the indication. There are a variety of techniques included in liquid penetrant testing, each dependent on the type of inspection and the type of flaws a technician is aiming to find.
It is highly recommended that proper training in the liquid penetrant method be received and Texas NDT Academy is the place for that cutting-edge learning. This method is one of the core elements of TXNDT. Some of the other courses offered are Magnetic Particle Testing, Ultrasonic Testing and Visual Inspection.
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