Non-destructive testing is the change of thermal, acoustic, optical, electrical and magnetic reactions caused by abnormal or defective internal structure of materials. It is a method to check and test the structure, nature and state of samples and the types, properties, quantity, shape, location, size, distribution and changes of defects by physical or chemical methods with the help of modern technology and equipment.
General detection method: X-ray detection (X-ray; R ray; Neutron rays; Ray is the mainstream method at present).
Extended data:
Visual inspection scope of nondestructive testing:
1, inspection of weld surface defects. Check welding quality, such as surface cracks, incomplete penetration and missing welding.
2. State check. Check surface cracks, peeling, pulling wires, scratches, pits, bumps, spots, corrosion and other defects.
3. Internal cavity examination. When some products (such as worm gear pumps, engines, etc. ), endoscopy should be carried out according to the items specified in the technical requirements.
4. Assembly inspection. When necessary, use the same 3D industrial video endoscope to check the assembly quality; After assembly or a process is completed, check whether the assembly position of each component meets the requirements of drawings or technical conditions; Whether there are assembly defects.
5. Inspection of surplus items. Check the residual internal debris and foreign matter in the product cavity.
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