The magnetic field is characterized by the action of the moving charge (or current). The magnitude, direction and distribution of the electric field magnetic field are also generated while the magnetic field changes, and can be represented by magnetic

Leakage magnetic field flaw detection is a method in which a ferromagnetic material or a workpiece is magnetized, and a discontinuity exists on the surface and the near surface, and a detectable leakage magnetic field is formed for flaw detection.

Non-destructive testing of nuclear power engineering requires compliance with many safety laws and regulations, and the qualification requirements for inspectors are very strict.

Whether the defect can be detected by radiography depends on several links.

X-ray flaw detection is suitable for detecting internal defects, X-rays cannot locate the buried depth of defects, and there is radiation.

In the production time and quality inspection of refractory products, destructive testing is usually used. At the same time as the test is completed, the sample is also destroyed, and a destructive test can only be carried out for sampling inspection.