scholarly journals Computation of three-dimensional electromagnetic field in the eddy-current testing of steel pipes

1988 ◽  
Vol 24 (6) ◽  
pp. 3168-3170 ◽  
Author(s):  
H. Tsuboi ◽  
T. Misaki ◽  
T. Kikuta
Keyword(s):  
Electromagnetic Field ◽  
Eddy Current ◽  
Three Dimensional ◽  
Eddy Current Testing ◽  
Steel Pipes ◽  
Current Testing

Quantitative Research on Cracks in Pipe Based on Magnetic Field Response Method of Eddy Current Testing

2021 ◽  
Vol 36 (1) ◽  
pp. 99-107
Author(s):  
Feng Jiang ◽  
Shulin Liu ◽  
Li Tao
Keyword(s):  
Magnetic Field ◽  
Eddy Current ◽  
Quantitative Research ◽  
Three Dimensional ◽  
Impedance Analysis ◽  
Eddy Current Testing ◽  
Element Analysis ◽  
Defect Parameter ◽  
Current Testing ◽  
The Magnetic Field

The quantitative evaluation of defects in eddy current testing is of great significance. Impedance analysis, as a traditional method, is adopted to determine defects in the conductor, however, it is not able to depict the shape, size and location of defects quantitatively. In order to obtain more obvious characteristic quantities and improve the ability of eddy current testing to detect defects, the study of cracks in metal pipes is carried out by utilizing the analysis method of three-dimensional magnetic field in present paper. The magnetic field components in the space near the crack are calculated numerically by using finite element analysis. The simulation results confirm that the monitoring of the crack change can be achieved by measuring the magnetic field at the arrangement positions. Besides, the quantitative relationships between the shape, length of the crack and the magnetic field components around the metal pipe are obtained. The results show that the axial and radial magnetic induction intensities are affected more significantly by the cross-section area of the crack. Bz demonstrates obvious advantages in analyzing quantitatively crack circumference length. Therefore, the response signal in the three-dimensional direction of the magnetic field gets to intuitively reflect the change of the defect parameter, which proves the effectiveness and practicability of this method.

scholarly journals Surface Eddy Current Probes: Excitation Systems of the Optimal Electromagnetic Field (Review)

2020 ◽  
Vol 11 (2) ◽  
pp. 91-104
Author(s):  
V. Ya. Halchenko ◽  
R. V. Trembovetskaya ◽  
V. V. Tychkov
Keyword(s):  
Electromagnetic Field ◽  
Eddy Current ◽  
Eddy Current Testing ◽  
Optimal Synthesis ◽  
Theoretical Research ◽  
Electromagnetic Excitation ◽  
Excitation Field ◽  
Actual Problem ◽  
Current Testing ◽  
Testing Zone

Development of technical tools with improved metrological and operational characteristics is the actual problem of the eddy current testing. Ensuring the optimal distribution of the electromagnetic excitation field in the testing zone carries out confident detection of the defects and determination of their geometrical parameters by means of eddy current testing. The purpose of the work was to conduct an analysis of scientific and technical information in the field of eddy current testing to study of the use of electromagnetic excitation fields with a priori specified properties, as well as to generalize and systematize the accumulated experience and approaches to conduct theoretical research in this direction.A review of publications in the field of non-destructive electromagnetic testing devoted to the improvement of the excitation systems of eddy current flaw probes was carried out. The authors considered approaches in which a uniform distribution of the electromagnetic field on the control object surface was achieved by linear and non-linear optimal synthesis of excitation systems, provided the immobility of the probe relative to the testing object. Analysis of eddy current probe designs with a homogeneous excitation field created by circular, rectangular tangential and normal coils, as well as by creating a rotational excitation field was carried out. The authors studied designs of the excitation coils of probes with fields of complex configuration characterized by the original fractal geometry which can increase the probability of identifying defects that were not amenable to detection by classical probes.Studies that suggested the formation of optimal configuration fields in a given area using magnetic cores, field concentrators made of conductive materials and specially shaped screens were analyzed. The authors studied approaches to the implementation of the optimal synthesis of excitation systems of probes with uniform sensitivity in the testing zone using surrogate optimization for cases of moving testing objects taking into account the speed effect.The experience, as well as the results of theoretical studies devoted to the problem of designing eddy current probes with uniform sensitivity in the testing zone due to the uniform density distribution of the induced currents flowing in the object were generalized and systematized. As a result, the classification of probes on a number of features that characterize the excitation systems was proposed.

Examination of Gilded Bronze Artifacts Using Nondestructive Eddy Current Techniques

2002 ◽  
Vol 712 ◽  
Author(s):  
Johanna R. Bernstein ◽  
Blythe McCarthy
Keyword(s):  
Electromagnetic Field ◽  
Metal Surface ◽  
Eddy Current ◽  
Eddy Current Testing ◽  
Current Testing

ABSTRACTIn the examination of gilded bronze objects, the analysis of the thickness of the gilding layer, the condition of the substrate and the gilding method is often difficult to manage without taking samples. Yet, the resulting information is vital to research on ancient metalworking and can answer questions of authenticity. The use of nondestructive eddy current techniques can overcome these sampling limitations. Eddy current methods are typically used in the automotive, power and aerospace industries for flaw inspection and alloy selection. In this method, the interaction of an electromagnetic field induced by a coil probe with the metal surface shifts the probe impedance which is measured and correlated to properties of the metal. Results are presented which show that eddy current testing can be used to characterize a gilding layer on a bronze substrate by variations in thickness or composition.

Three-dimensional analysis on eddy current testing for S/G tubes

1992 ◽  
Vol 28 (2) ◽  
pp. 1466-1468 ◽  
Author(s):  
K. Satake ◽  
M. Tanaka ◽  
N. Shimizu ◽  
Y. Araki ◽  
K. Morimoto
Keyword(s):  
Dimensional Analysis ◽  
Eddy Current ◽  
Three Dimensional ◽  
Eddy Current Testing ◽  
Current Testing

Research on the Integrated Ultrasound and Eddy Automatic Inspection System of Seamless Steel Pipe

2011 ◽  
Vol 101-102 ◽  
pp. 100-103
Author(s):  
Liang Hui Shang ◽  
Xiao Jun Zhou ◽  
Si Yuan Wu ◽  
Chen Long Yang
Keyword(s):  
Eddy Current ◽  
Imaging System ◽  
Detection System ◽  
Three Dimensional ◽  
Steel Tube ◽  
Eddy Current Testing ◽  
Inspection System ◽  
Testing System ◽  
Current Testing ◽  
Seamless Steel

The existed semi-automatic ultrasound eddy current testing system is difficult to adapt to the situation of seamless steel tube detection requirements at present. This paper puts forward an ultrasonic eddy current synchronous auto-detection system. The principle of ultrasonic eddy current testing tube and the design of the ultrasonic eddy current probe frame are introduced. Software system uses ultrasonic and eddy current imaging at the same time, and ultrasonic testing’s results can be displayed by A+B+C combination imaging. The quasi three-dimensional imaging system can offer more convenient methods to detect personnel. Experimental results verify the feasibility of the system.

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