Device and method for detecting defects of inner and outer walls of pipeline based on three-axis magnetic flux leakage and eddy current

Abstract

The invention relates to a device and a method for detecting defects of inner and outer walls of a pipeline based on three-axis magnetic flux leakage and eddy current, and belongs to the technical field of non-destructive testing. The device comprises a magnetic flux leakage detector, a data processing and storing device, a power supply, at least three odometer wheels and an eddy current detector, wherein the eddy current detector consists of an eddy current sensor and is a device used for detecting the defects on inner and outer surfaces of the pipeline. According to the device provided by the invention, a magnetic flux leakage detection method and an eddy current detection method are combined by using different characteristics of the magnetic flux leakage detection method and the eddy current detection method, so that the function of distinguishing the defect of the inner wall from the defects of the outer wall is realized; and in addition, the method provided by the invention is favorable in detection quality and simple in operation and can be widely applied to non-destructive detection of oil transmission pipelines in the industrial fields of petroleum, petrifaction and the like.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, in particular to a device and method for detecting inner and outer wall defects of pipelines based on three-axis magnetic flux leakage and eddy current. Background technique [0002] The magnetic flux leakage detection method is a non-destructive testing technology with a high degree of automation. It is widely used in the quality inspection and safety monitoring of ferromagnetic materials. It has a very good detection effect on the identification of surface defects, but it has little effect on the identification of internal and external defects. , The eddy current testing method is also one of the commonly used non-destructive testing techniques. Using the principle of eddy current, the identification effect of near-surface defects is obvious. The above two methods have their own advantages and disadvantages, and neither can complete the distinction and identification of internal...

AI Technical Summary

Problems solved by technology

[0002] The magnetic flux leakage detection method is a non-destructive testing technology with a high degree of automation. It is widely used in the quality inspection and safety monitoring of ferromagnetic materials. It has a very good detection effect on the identification of surface defects, but it has little effect on the identification of internal and external defects. , the eddy current testing method is also one of the commonly used non-destructive testing techniques, using the principle of eddy current, the effect of identifying near-surface defects is obvious

The above two methods have their own advantages and disadvantages, and neither can complete the identification of internal and external surface defects of the pipeline alone.

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