Numerical Simulation of Non-Destructive Remote Field Eddy Current Testing of Rolled Metal Tubes

The first publications describing the physical principles of the non-destructive remote field eddy current testing method appeared about 30 years ago. This method allows to significantly expand the field of application of eddy current testing. However, due to the lack of a theoretical justification, this method did not get widespread use around the world. Domestic publications in this area are completely absent, and the descriptions given in few foreign publications often contradict each other. There are no results of full-scale simulation using numerical methods in available domestic and foreign sources. The distinctive feature of this method under consideration is the ability of detecting defects on the external (with respect to the eddy current transducer) side of the tested object, which is impossible for the classical eddy current method due to the limited eddy current penetration depth. The basics of the method were considered, the distinctive features were presented, and the advantages and disadvantages of remote field eddy current testing of metals were pointed out. A numerical simulation with the subsequent analysis of the obtained results has been carried out, the transducer design for remote field eddy current testing is given. The influence of various factors on the change in the added voltage of the signal coil of the eddy current transducer in the presence of a defect in the external wall of the tube was considered. Expressions that determine the optimal ratio of the diameters of the transducer and the tested product were obtained. The values of the test parameters and the limiting wall thickness of the tested ferromagnetic product were determined.

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Numerical simulation of non-destructive remote field eddy current testing of rolled metal tubes

Journal of Physics Conference Series ◽

10.1088/1742-6596/1327/1/012012 ◽

2019 ◽

Vol 1327 ◽

pp. 012012

Author(s):

A G Efimov ◽

B M Kanter ◽

N R Kuzelev ◽

E V Martyanov ◽

A E Shubochkin

Keyword(s):

Numerical Simulation ◽

Eddy Current ◽

Eddy Current Testing ◽

Rolled Metal ◽

Current Testing ◽

Non Destructive

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Scanning the steel 08G2B using superminiature eddy current probe

E3S Web of Conferences ◽

10.1051/e3sconf/202015701011 ◽

2020 ◽

Vol 157 ◽

pp. 01011 ◽

Cited By ~ 1

Author(s):

Sergey Dmitriev ◽

Alexey Ishkov ◽

Vladimir Malikov ◽

Alexander Katasonov ◽

Alexey Grigorev ◽

...

Keyword(s):

Eddy Current ◽

Extreme Values ◽

Current Method ◽

Probe Signal ◽

Eddy Current Method ◽

Software Complex ◽

Current Transducer ◽

Transducer Signal ◽

Eddy Current Transducer ◽

Continuity Defects

The article describes a hardware and software complex designed for defectoscopy and study of material properties. Sections of high-strength steel 08G2B pipes were scanned in the course of the research. The purpose of this study is to determine dependency of eddy current sensor signal and mechanical and operational properties of the base metal (K65 steel grade) and demonstrate the ability of developed eddy current probe to detect continuity defects and corrosion in this type of metal. The steel is ultra-low-carbon, which makes it possible to study their properties using the eddy current method. The eddy current method is a non-contact one being used both for cracks identification and determination of their characteristics. A special superminiature eddy current probe was developed, which includes three coils - stabilizing, measuring and exciting. The coils were placed on a pyramid-shaped core made of alloy 81NMA. The eddy-current transducer runs under the control of the developed hardware-software complex with a system for suppression of noise and amplification of signal received from the eddycurrent transducer. Signal processing makes it possible to separate the effects of closely spaced cracks on the eddy-current transducer signal and evaluate the contribution of each crack separately. As a parameter containing information about the presence of defects in the object of control, the voltage arrived at the measuring coil of the eddy current probe signal was used. The work studied sections of pipes with model continuity defects – cracks and holes. A research that allows to simulate the presence of corrosion in the metal was also conducted. The extreme values of the eddy current probe signal over defects of different types are obtained at various velocity, that allows to identify the type of defect, while changing the frequency of the signal on the probe allows to determine the depth of the defect.

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Research of thickness by using subminiature eddy-current transducers

MATEC Web of Conferences ◽

10.1051/matecconf/201822604017 ◽

2018 ◽

Vol 226 ◽

pp. 04017

Author(s):

Sergey F. Dmitriev ◽

Vladimir N. Malikov ◽

Anatoly M. Sagalakov

Keyword(s):

Eddy Current ◽

Measurement Techniques ◽

Current Method ◽

Dielectric Coating ◽

Measuring System ◽

Eddy Current Method ◽

Dielectric Coatings ◽

Current Transducer ◽

Transformer Type ◽

Eddy Current Transducer

On the basis of an eddy-current transducer of a transformer type, a measuring system is made, which makes it possible to estimate the possibility of using the eddy current method for measuring the thickness of conductive and dielectric coatings placed on a conductive base. The purpose of this work was to evaluate the possibility of using only an amplitude eddycurrent method for determining the thickness of a conductive or dielectric coating on a conductive base and estimating the error of such measurements. The design of the measuring system and measurement techniques is described. The article presents data demonstrating the dependence of the amplitude part of the signal on objects of different thicknesses; limiting object dimensions at which these measurements are expedient are experimentally established.

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Subminiature eddy current transducers for thickness measurement

MATEC Web of Conferences ◽

10.1051/matecconf/201822403007 ◽

2018 ◽

Vol 224 ◽

pp. 03007

Author(s):

Sergey Dmitriev ◽

Vladimir Malikov ◽

Anatoly Sagalakov

Keyword(s):

Eddy Current ◽

Base Material ◽

Current Method ◽

Signal Amplitude ◽

Thickness Measurement ◽

Eddy Current Method ◽

Conductive Coatings ◽

Dielectric Coatings ◽

Current Transducer ◽

Eddy Current Transducer

A new gage system was made based on the eddy-current transducer. The system makes it possible to evaluate the possibility of using the eddy current method to measure the thickness of conductive and dielectric coatings applied on a conductive base material. One of the important advantages of the developed gage system is the possibility of local measurement of the thicknesses of conductive and non-conductive coatings. In this article, in particular, the measurement features are described in detail, as well as the specificity of the gage system. Also it represents data, showing the dependence of signal amplitude on objects of different thicknesses, and experiments proved the limiting dimensions, at which measuring data are useful.

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