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Non-destructive testing (NDT) is a collection of analysis techniques used in science and technology to evaluate the properties of a material, component, or system without causing damage.
FREMONT, CA: NDT’s testing and analysis techniques that is used by industry to evaluate the properties of a material, component, structure, or system for characteristic differences or welding defects and discontinuities without causing damage to the original part. NDT is also known as non-destructive examination (NDE), non-destructive inspection (NDI), and non-destructive evaluation (NDE).
Here are four types of Non-Destructive Testing Methods.
This is a passive NDT technique that depends on detecting the short bursts of ultrasound emitted by the existing cracks under a load. Sensors dispersed over the surface structure detects the AE. It can even detect AE from plasticization in highly stressed areas before a crack is formed. A frequently used method while proof testing the pressure of a vessel, AE testing is also a continuous Structural Health Monitoring (SHM) method, for instance, on bridges. Leaks and active corrosion are detectable AE sources too.
Ground Penetrating Radar (GPR)
This geophysical NDT method transmits radar pulses through the surface of a material or subsurface structure, like rock, ice, water, or soil. The waves are reflected or refracted when encountering a buried object or a physical boundary with various electromagnetic properties.
Magnetic Flux Leakage (MFL)
This method utilizes a powerful magnet to develop magnetic fields that saturates steel structures like pipelines and storage tanks. A sensor is then used to detect the changes in magnetic flux density, which display a reduction in the material that occurs due to pitting, erosion, or corrosion.
Neutron Radiographic Testing (NR)
Neutron radiography utilizes a beam of low energy neutrons to penetrate the workpiece. While the beam is transparent in metallic materials, most organic materials allow the beam to be seen, enabling the structural and internal components to be viewed and examined to detect flaws.
Ultrasonic Testing (UT)
Ultrasonic Testing entails the transmission of high-frequency sound in material to interact with features within the material that reflects or attenuate it. Ultrasonic testing is broadly divided into Pulse Echo (PE), Through Transmission (TT), and Time of Flight Diffraction (ToFD).