Nondestructive testing method for metal surface welding cracks based on CSRR electromagnetic structure

Abstract

The invention discloses a nondestructive testing method for metal surface welding cracks based on a CSRR electromagnetic structure, and the nondestructive testing method mainly utilizes the sensitivity of the CSRR electromagnetic structure to the metal surface welding cracks to realize the nondestructive testing of the metal surface welding cracks; the vector network analyzer provides a broadband vector signal for the CSRR electromagnetic structure, and the signal is coupled to the CSRR electromagnetic structure through the microstrip line; the CSRR electromagnetic structure is coupled with a welding part with a welding crack right above the CSRR electromagnetic structure, and when the CSRR electromagnetic structure detects that a crack exists in a welding seam, the resonant frequency of the CSRR electromagnetic structure can obviously deviate. In the whole detection process, the CSRR electromagnetic structure is not in contact with the to-be-detected weldment, so that no new defect is introduced to the to-be-detected weldment, and the purpose of nondestructive detection is achieved.

Description

technical field [0001] The invention belongs to the technical field of metal surface welding crack detection, and in particular relates to a nondestructive detection method for metal surface welding cracks based on a CSRR electromagnetic structure. Background technique [0002] With the rapid development of industrial technology, the application of metal materials is becoming more and more extensive, and the quality control of various metal materials is also more stringent. [0003] Welding is a common method of manufacturing and processing, but due to the processing principle of this method, it is prone to denaturation and cracking during the processing process, and some defects are very concealed, and people cannot find them in quality inspection. For metal and non-metal materials, microwaves have different characteristics. In the detection of metal materials, microwaves will not penetrate the material, but will form reflections on the metal surface. What the inspector nee...

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Problems solved by technology

[0005] In order to solve the above problems in the prior art, the present invention is based on the high sensitivity of the resonant frequency of the complementary split resonant ring (CSRR) electromagnetic structure to the metal surface weld, and provides a non-destructive detection of metal surface welding cracks based on the CSRR electromagnetic structure method to solve the problems of large size, high cost and complicated operation of traditional testing equipment in the process of nondestructive testing

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