Features of non-destructive testing

A. The feature of non-destructive testing is that it can be tested without damaging the material and structure of the test piece, so after the implementation of non-destructive testing, the inspection rate of the product can reach 100%. However, not all items and indicators that have to be tested can be NDT, and NDT technology has its limitations. Certain tests can only use destructive tests. Therefore, non-destructive testing cannot replace destructive testing at present. In other words, for the evaluation of a workpiece, material, machinery, and equipment, the results of non-destructive testing and destructive testing must be compared and matched with each other to get an accurate assessment.

B. Correctly choose the timing of non-destructive testing: In non-destructive testing, you must correctly choose the timing of non-destructive testing according to the purpose of non-destructive testing.

C. Correctly select the most appropriate non-destructive testing method: Since various testing methods have certain characteristics, to improve the reliability of the test results, it should be expected to occur according to the equipment material, manufacturing method, working medium, use conditions and failure mode Select the appropriate non-destructive testing method for the type, shape, location, and orientation of the defect.

D. Comprehensive application of various non-destructive testing methods: any non-destructive testing method is not, each method has its advantages and disadvantages. Several detection methods should be invoked as much as possible to complement each other to ensure the safe operation of pressure equipment. Also, in the application of non-destructive testing, it should be fully realized that the purpose of testing is not to pursue excessively demanding "high quality", but should focus on its economics under the premise of fully ensuring safe and appropriate risk rates. Only in this way can be the application of non-destructive testing in pressure equipment achieves the desired purpose.