A heat exchange tube defect detection method based on eddy current signal characteristics

Abstract

The invention belongs to the technical field of nondestructive detection and particularly relates to a heat exchange tube flaw detection method based on vortex signal features, comprising the steps of performing signal feature analysis according to various vortex signals to obtain a feature library; combining the signal features to form flaw identification rules; reading heat exchange tube vortex detection data, and performing vortex signal normalizing and signal calibrating; positioning structures; dividing a heat exchange tube into different structure regions and free regions according to the structure positioning results of the above step; measuring a signal and matching its feature range according to rule units included in each class of flaw identification rules, and determining that a certain class of flaws are discovered if all rule units included in the certain class of flaw recognition rules are matched successfully; comparatively analyzing historical data; performing full-automatic analytic process; repeating the steps III to VII until a whole steam generator is finished with heat exchange tube flaw detection. Manpower cost and detection time are saved greatly at the premise of meeting vortex detection needs.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a heat exchange tube defect detection method based on eddy current signal characteristics. Background technique [0002] The steam generator heat transfer tube is a key component of the pressure boundary integrity of the primary circuit of a nuclear power plant, and it is also the weakest link in the entire circuit. At present, the most effective way to test the heat transfer tube is eddy current nondestructive testing. The entire eddy current inspection system is usually composed of multiple subsystems, which can be divided into three parts: signal system, positioning scanning system and auxiliary system. The signal system mainly includes eddy current signal acquisition system, eddy current signal analysis software, eddy current instrument, probe and other related components. During the eddy current detection process, signal acquisition is a prerequi...

AI Technical Summary

Problems solved by technology

In the entire eddy current testing system, signal analysis is the core of the whole testing system, and it is also the most difficult and time-consuming link of the whole analysis system. Foreign nondestructive testing companies have developed an automatic analysis system for eddy current signals, which has succeeded in replacing some analysts. Facts have proved that The use of eddy current signal automatic analysis software can greatly reduce the number of analysts, save labor costs, and shorten the detection period. At present, some automatic analysis modules abroad have different implementation methods, and the detection results have their own advantages and disadvantages.

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