Steel pipe wall thickness measuring method based on eddy current permeability measurement
A technology of wall thickness measurement and magnetic permeability, applied in the direction of electromagnetic measuring device, electric/magnetic thickness measurement, measuring device, etc., can solve the problems of difficulty in measuring the thickness of in-service pipelines, insufficient stability and reliability, etc., and achieve a solution The effect of measuring fine local wall thickness changes, low cleanliness requirements, and simple structure
Inactive Publication Date: 2017-03-22
WUHAN HUAYUYIMU TESTING EQUIP CO LTD
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Problems solved by technology
Electromagnetic ultrasonic thickness measurement can realize non-contact small lift-off measurement, but its stability and reliability are insufficient, and it is difficult to realize the thickness measurement of in-service pipelines
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[0022] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples cited are only used to explain the present invention, and are not used to limit the scope of the present invention.
[0023] The invention discloses a steel pipe wall thickness measurement method based on eddy current permeability measurement, which includes the following steps:
[0024] S1: Use the magnetizer 5 to uniformly magnetize the inspected steel pipe 1 to a certain strength;
[0025] S2: The center lines of the measuring eddy current excitation coil 31 and the measuring eddy current receiving coil 32 face the surface of the steel pipe 1 along the normal direction, and the magnetic permeability of the steel pipe 1 is induced to change;
[0026] S3: The center lines of the reference eddy current excitation coil 41 and the reference eddy current receiving coil 42 face the surface of the steel plate 2 in the normal direction, and the magneti...
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Abstract
The invention relates to a steel pipe wall thickness measuring method based on eddy current permeability measurement. Under a precondition of unchanged total magnetic flux, a steel pipe is magnetized, and thereafter magnetic flux density in the steel pipe is greater than the magnetic flux density corresponding to a maximum magnetic permeability point. The change of the local steel pipe wall thickness is capable of causing the change of the magnetic flux density of the same part in the steel pipe, and the magnetic permeability of the same part of the pipe body is changed, and the change is expressed on the surface layer of the steel pipe. Center lines of an excitation coil and a receiving coil of an eddy current measuring head face the surface of the steel pipe along a normal direction, and center lines of an excitation coil and a receiving coil of another eddy current measuring head face a surface of a reference steel plate along a normal direction. The reference steel plate is magnetized by adopting an independent magnetizer, and the differential motion of the output signals of the two eddy current measuring heads is carried out. When the steel pipe local wall thickness is changed, the amplitudes of the differentially-output eddy current detection signals are changed along with the change of the steel pipe local wall thickness, and therefore non-contact thickness measurement is realized. The steel pipe wall thickness measuring method is advantageous in that non-contact large lift-off measurement is realized without requiring coupling, and the measuring method is suitable for a high-speed thickness measuring requirement, and a requirement on the surface of the steel pipe is low.
Description
Technical field [0001] The invention relates to the field of nondestructive testing, in particular to a method for measuring the wall thickness of a steel pipe based on eddy current permeability measurement. Background technique [0002] Steel pipes are widely used in petroleum, chemical, electric power and other industries, and the wall thickness during manufacturing and use is the key control parameter. Commonly used ultrasonic thickness measurement methods require coupling agents and are slow. Thickness measurement in high-speed motion is a difficult problem for steel pipe thickness measurement. Thickness measurement in non-contact and high-speed motion is a difficult problem for steel pipe thickness measurement. Electromagnetic ultrasonic thickness measurement can realize non-contact small lift-off measurement, but the stability and reliability are insufficient, and it is difficult to realize the thickness measurement of in-service pipelines. Summary of the invention [000...
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IPC IPC(8): G01B7/06G01N27/90
CPCG01B7/10G01N27/90
Inventor 康宜华邓志扬张继楷邱晨
Owner WUHAN HUAYUYIMU TESTING EQUIP CO LTD
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