Non-destructive testing means does not damage or affect the performance of the measured object, does not harm the object to be detected to provide the organization, the internal structure of the material abnormalities or defects, the use of heat, sound, light, electricity, by means of physical methods, the use of modern technology and Magnetic, and other reactions caused by equipment, equipment, or chemical changes, state, nature, quantity, shape, location, size, distribution, and change detection methods of structure, properties, and defect types on and under the specimen surface and interior. Non-destructive testing is an indispensable tool for industrial development. To some extent, it reflects the level of industrial development in a country. The importance of non-destructive testing has been recognized, including radiological testing (RT), ultrasonic testing (UT) , Magnetic particle testing (MT) and liquid penetration testing (PT) IV. There are other non-destructive tests such as ECT, AE, LT, LT, ACFMT, MFL, and far-field testing Detection (RFT), ultrasonic TOFD method (TOFD) and so on.
Nondestructive testing is the use of acoustic materials, optical, magnetic and electrical and other characteristics, without affecting or affecting the performance of the object under test, there are defects or non-uniformity of the detection object, given the size of the defect, the nature of the information and Quantity. Compared with destructive testing, nondestructive testing has the following characteristics. The first one is non-destructive because it does not affect the detection performance of the test object; the second synthesis, the test is non-destructive, so the object can detect 100% of the comprehensive test, if necessary, this is Destructive testing is impossible; the third has a complete, destructive testing, generally only applicable to the testing of raw materials, such as the commonly used tension, mechanical compression, bending, nondestructive testing of raw materials manufacturing, finished products and materials, Unless service is not going to allow it to continue, it is not non-destructive testing and non-destructive testing Non-destructive testing is the object of Ted Lee to use the show. Therefore, it is not only used to manufacture the raw material for each intermediate step, the entire finished product of the test, but also the service on the test equipment.
Visual inspection of non-destructive testing: 1, weld surface defects testing. Check the weld surface cracks, impermeability and weld quality of the leak. 2, the national exam. Check the surface cracks, peeling, cables, scratches, dents, bumps, spots, corrosion and other defects. 3, cavity detection. When some products (such as worm gear pump, engine, etc.) work, remote visual inspection will be carried out according to engineering and technical requirements. 4, assembly inspection. If necessary, use the same 3D industrial video endoscope assembly quality inspection; or after the assembly is completed, check the assembly location of parts and components to meet the requirements of the drawings or technical conditions; the presence of assembly defects. 5, additional material inspection. Inspect the product for dust, foreign matter and other residues in the cavity.
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