A combined detection method of electromagnetic ultrasonic longitudinal guided wave and magnetic flux leakage detection

An electromagnetic ultrasonic and magnetic flux leakage detection technology, which is applied in the direction of material magnetic variables, can solve the problems of different corrosion mechanisms, different treatment methods, unfavorable problems, etc., and achieve the effect of simple detection method, fast detection speed and fast detection speed
CN103353479BInactive Publication Date: 2016-10-19XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAMEN UNIV
Publication Date
2016-10-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an electromagnetic ultrasonic longitudinal guided wave and magnetic leakage detection compounded nondestructive detection method. On the original basis of magnetic leakage, an electromagnetic ultrasonic (EMAT) exciting coil and an electromagnetic ultrasonic (EMAT) receiving coil are added. When the detection process is normal, only magnetic leakage detection is performed. When a defect is found by the magnetic leakage method, the electromagnetic ultrasonic (EMAT) exciting coil sends an ultrasonic longitudinal guided wave on the inner surface of a steel plate to be detected. Through analyzing the ultrasonic longitudinal guided signal received by the electromagnetic ultrasonic (EMAT) receiving coil, it can be determined whether a defect exists in the inner surface of the steel plate to be detected, thus determination of defects in the inner / outer surfaces of the steel plate to be detected is realized. The electromagnetic ultrasonic longitudinal guided wave and magnetic leakage detection compounded detection method effectively overcomes the shortages of low accurate rate of determination on defects and low detection speed in the prior art, and has the advantages of simple structure, little information processing amount and non-contact measurement.
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Description

technical field

[0001] The invention relates to the field of non-destructive testing, in particular to a combined testing method of electromagnetic ultrasonic longitudinal guided wave and magnetic flux leakage testing. Background technique

[0002] Since long-distance oil and gas pipelines have been widely used as a means of energy transportation in recent years, the scale of laying oil and gas pipelines and storage tanks has become extremely large. With the gradual aging of existing equipment and the continuous deterioration of crude oil quality, it has become very important to detect its safety and reliability. Steel plate defects used in long-distance pipelines and storage tanks can be mainly divided into two categories, namely "external corrosion" and "internal corrosion". "External corrosion" is generally caused by groundwater or rainwater erosion around the steel plate; "internal corrosion" is generally caused by corrosive impurities contained in crude oil and steel p...

Claims

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