THE ABILITY TO ASSESS THE DEGREE OF CORROSION DAMAGE BY EDDY CURRENT TESTING

2021 ◽  
pp. 96-104
Author(s):  
V.S. Shitikov ◽  
◽  
N.P. Kodak ◽  
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Corrosion Damage ◽  
Element Model ◽  
Damage Evaluation ◽  
Probe Signal ◽  
Eddy Current Method ◽  
Current Testing ◽  
Surface Probe ◽  
Signal Response

Considers possibility of corrosion damage evaluation using eddy current method implemented with surface probe. Comparative analysis of amplitude-phase and phase suppression methods implementation has been conducted. Finite-element model for calculating probe signal response to defects of different corrosion type was designed. Experimental research has been conducted that allowed to verify the designed model and to confirm results gained with mathematical simulation.

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

2019 ◽  
pp. 46-55
Author(s):  
A.G. Efimov ◽  
N.R. Kuzelev ◽  
E.V. Martyanov ◽  
B.M. Kanter ◽  
A.E. Shubochkin
Keyword(s):  
Numerical Simulation ◽  
Eddy Current ◽  
Current Method ◽  
Eddy Current Testing ◽  
Eddy Current Method ◽  
Current Testing ◽  
Advantages And Disadvantages ◽  
Current Transducer ◽  
Non Destructive ◽  
Eddy Current Transducer

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.

scholarly journals Scanning the steel 08G2B using superminiature eddy current probe

2020 ◽  
Vol 157 ◽  
pp. 01011 ◽  
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.

Detection of the Corrosion of Axisymmetric Elements by Means of the Eddy Current Testing Method

2015 ◽  
Vol 227 ◽  
pp. 545-548 ◽  
Author(s):  
Andrzej Zbrowski ◽  
Wojciech Jóźwik
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Eddy Current Method ◽  
Current Testing ◽  
Bearing Ring ◽  
Testing Method ◽  
Signal Value ◽  
Corrosion Defects ◽  
Bearing Rings ◽  
Peak Value

The article describes the influence the operating frequency of the transducer on the possibility to detect corrosion using the eddy current method. A bearing ring with two artificially made corrosion defects was used as a test object. The authors determined the characteristics of the defect’s signal value in the function of frequency. The results obtained were then compared to the peak-to-peak value of the signal for a model ring. The tests confirmed the possibility of automatic detection of corrosion on the surface of bearing rings using the eddy current method.

Evaluation of Phase Transformation in Manganese Steels by Eddy Current Method

2010 ◽  
Vol 442 ◽  
pp. 316-321
Author(s):  
S.H. Khan ◽  
Aamer Nusair Khan ◽  
K. Mahmood
Keyword(s):  
Nondestructive Evaluation ◽  
Eddy Current ◽  
Current Method ◽  
Evaluation Technique ◽  
Eddy Current Method ◽  
Compression Load ◽  
Current Testing ◽  
Different Types ◽  
Manganese Steels

An investigation was conducted to explore the applicability of eddy current nondestructive evaluation technique for the characterization of manganese steels. Specimens of two different types of manganese steels were subjected to various compression loads. The specimens were then evaluated by mechanical and eddy current testing. The hardness and eddy current values were increased due to conversion of austenite to martensite. In this study the correlation between eddy current parameters and compression load was discussed.

Wireless Eddy Current Probe Prototype and Monitor Design and Aircraft Maintenance Applications

2014 ◽  
Vol 905 ◽  
pp. 448-451 ◽  
Author(s):  
Engin Gode ◽  
Melih Cemal Kushan ◽  
Sinem Cevik Uzgur
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Probe Design ◽  
Aircraft Maintenance ◽  
Eddy Current Method ◽  
Current Testing ◽  
Testing Method ◽  
Operation Conditions ◽  
Flexible Operation ◽  
Wide Usage

Eddy current testing method has a wide usage in the field of Industry. Especially, aircraft maintenance field has so many applicable areas for this method. In addition, a wide variety of inspections and measurements may be performed easily with the eddy current method. More effective and flexible operation conditions were reached by designing wireless eddy current probe prototype for all aircraft maintenance inspections. Prototype probe design, the advantages of use of this probe in aircraft maintenance applications and inspections performed as wireless were studied in this paper.

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