What is the classification of non-destructive testing?

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1. Ultrasonic detection principle Ultrasonic non-destructive detection, also known as ultrasonic NDT or simply UT, is a method of using high frequency sound waves to characterize the thickness or internal structure of the device under test. When the ultrasonic wave propagates in the material to be tested, the acoustic characteristics and internal structure changes of the material have a certain influence on the propagation of the ultrasonic wave. The technique of understanding the material properties and structural changes by detecting the degree and condition of the ultrasonic wave is called ultrasonic. Detection.

At present, there are technologies such as pulse reflection method, TOFD, phased array.

2. The principle of ray detection utilizes the intensity attenuation of rays (X-rays, γ-rays, neutron rays, etc.) passing through materials or test pieces, and the technique of detecting the internal structure without inertia is called ray detection. The rays passing through the material or the workpiece are different in sensitivity to the X-ray film due to the difference in strength, thereby generating an image that is not conventionally used internally.

Radiation detection is generally classified into radiography, fluoroscreen (developed into industrial television), dry-plate photography, tomography (industrial CT) technology, digital display technology, etc., depending on the internal structure display method.

3. Magnetic particle detection principle Magnetic particle detection is a non-destructive testing method that uses the magnetic flux leakage and suitable inspection medium to find the discontinuity of the surface and near surface of the test piece.

4. Penetration detection principle The capillary action of the liquid is used to inject the permeate into the open defect of the surface of the solid material. The infiltrated permeate is then aspirated through the developer to the surface to indicate the presence of defects. This non-destructive testing method is called penetration testing.

5, eddy current detection principle eddy current detection is the use of ferromagnetic coil induced in the workpiece eddy current, analysis of the internal quality of the workpiece non-destructive testing method