Subsurface Defects Evaluation using Eddy Current Testing

Rifai, Damhuji; Abdalla, Ahmed N.; Khamsah, Noraznafulsima; Aizat, Mohd; Fadzli, Muhd

doi:10.17485/ijst/2016/v9i9/88724

Cited by 34 publications

(24 citation statements)

References 18 publications

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“…Eddy current testing (ECT) which is based on the principle of electromagnetic induction is regarded as an effective nondestructive testing method [1]. It can be used to detect surface [2,3] and subsurface [4,5] defects in conductive materials and measure thicknesses [6,7] of metallic plates.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate

Zeng

Ding

et al. 2019

Chin. J. Mech. Eng.

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In eddy current testing, the law of attenuation of eddy current (EC) is of great concern. In conductive half space under the excitation of uniform magnetic field, the EC density decreases exponentially in the depth direction. However, in conductor with finite thickness tested by coil, the distribution of EC in the depth direction is more complicated. This paper studies the characteristics of EC attenuation in metallic plate of finite thickness. Simulation results show that there is an EC reflection at the bottom of plate, which changes the law of EC attenuation. A new concept, namely the equivalent attenuation coefficient, is proposed to quantify the speed of EC attenuation. The characteristics of EC attenuation are utilized to explain the nonmonotonic relation between coil voltage and plate thickness. Procedure of selecting frequency is discussed. Thereafter, measurement of plate thickness is carried out and accurate result is obtained.

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Section: Introductionmentioning

confidence: 99%

Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate

Zeng

Ding

et al. 2019

Chin. J. Mech. Eng.

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“…However, a phenomenon known as tempered martensite embrittlement (TME) produces a decrease in impact toughness at room temperature in the tempering temperatures range from 200 to 400 °C at tempering time of 1 hour. Tempered martensite embrittlement is also manifested through an increase in ductile to brittle transition temperature (DBTT) [6] [7]. Austenite decomposition, cementite precipitation, and cementite coarsening have been identified as mechanisms contributing to TME [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

S55c Carbon Steel for Heat Treatment Process with Different Medium in Attenuation Measurement using Ultrasonic Testing

Ali

Paw²,

Sulaiman

et al. 2018

IJET

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Ultrasonic testing or commonly known as UT is one of the non-destructive testing technique and widely used in oil and gas industrial inspection. This technique mostly used in defect or crack identification of the pipeline and also used for flaw detection/evaluation, dimensional measurements, and material characterization. This paper presents the effect of heat treatment for S55C carbon steel in attenuation measurement by using ultrasonic testing including annealing, tempering, and quenching process. Seawater and oil are used as a medium of quenching process. The fixed excitation frequency at 4 MHz is used and 0 degrees with double crystal is implemented in this measurement. The thicknesses of blocks used are as the sample from 30mm until 80mm. The result shows that the measurement of material attenuation will be decreased after annealing, tempering and quenching process from 40% until 99% compared to before the heat treatment process. The highest attenuation decreasing can be seen on the sample block with the 30mm thickness in the heat treatment process.

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“…Thus, in works [21,22], a method for evaluation of brittle fracture in metal equipment by eddy current testing with the help of proximity and overhead sensors is proposed. 09G2S low-alloy steel was used for experiments.…”

Section: Introductionmentioning

confidence: 99%

Subminiature eddy current transducers for studying aluminium-dielectric and steel-dielectric junctions

Дмитриев¹,

Sagalakov²,

Катасонов³

et al. 2018

Proceedings of the International Conference "Actual Issues of Mechanical Engineering" (AIME 2018)

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Based on a eddy current transducer (ECT), a probe has been designed to research metal-dielectric structures (MDS). A scheme that uses a computer as a generator and receiver of signals from windings is proposed. The measurement procedure allowing one to detect defects in laminate composites with a high accuracy is described. The transducer was tested on the layered structure consisting of paper and aluminum layers with a thickness of 100 μm each in which the model defect was placed. The dependences of the ECT signal on the defect in this structure are given. A hardware-software complex was built to perform experimental studies of steel at the interface boundary. Test results are reported for a specimen with continuous and discrete measurements taken at different frequencies. The curve of introduced voltage amplitude as a function of sensor location was constructed to study in detail the introduced voltage drop at the ferromagnetic-dielectric interface.

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Subsurface Defects Evaluation using Eddy Current Testing

Cited by 34 publications

References 18 publications

Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate

Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate

S55c Carbon Steel for Heat Treatment Process with Different Medium in Attenuation Measurement using Ultrasonic Testing

Subminiature eddy current transducers for studying aluminium-dielectric and steel-dielectric junctions

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