nondestructive inspection
Non-destructive testing refers to the changes of heat, sound, light, electricity, magnetism and other reactions caused by abnormal or defective internal structure of mechanical materials through physical or chemical means on the premise that the internal structure of mechanical materials does not damage or affect the performance of the tested object and the internal structure of the tested object.
With the help of modern technology and equipment, the method of checking and testing the structure and state of the specimen, as well as the type, quantity, shape, nature, location, size, distribution and changes of defects.
Nondestructive testing is an indispensable and effective tool for industrial development, which reflects the industrial development level of a country to a certain extent, and the importance of nondestructive testing has been recognized.
Knowledge expansion:
Nondestructive testing, NDT for short, is also called nondestructive testing. It is a technology to detect the defects, chemical and physical parameters of materials, parts and equipment by using the principles of ray, ultrasonic wave, infrared ray and electromagnetism without destroying or affecting the performance of the detected object.
Common such as ultrasonic detection of cracks in welds. NDT Society of China Mechanical Engineering Society is the academic organization of NDT in China, and TC56 is its standardization organization. Namely: National Technical Committee for Standardization of Nondestructive Testing.
Non-destructive testing is to use the acoustic, optical, magnetic and electrical characteristics of materials to detect whether there are defects or inhomogeneities in the detected object without damaging or affecting its performance, and give information such as the size, location, nature and quantity of defects.
No damage, because the performance of the detected object will not be damaged during the test; It is comprehensive, because the detection is non-destructive, so when necessary, it can carry out 100% comprehensive detection on the detected object, which is impossible for destructive detection.
With the whole process, destructive testing is generally only suitable for testing raw materials, such as stretching, compression, bending and so on. , widely used in mechanical engineering, destructive testing of manufacturing raw materials.