Lift-off invariant inductance of steels in multi-frequency eddy-current testing

Lü, Mingyang; Meng, Xiaobai; Huang, Ruochen; Chen, Liming; Peyton, Anthony; Yin, Wuliang

doi:10.1016/j.ndteint.2021.102458

Cited by 21 publications

(7 citation statements)

References 41 publications

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“…From the experiment, a safe measurement can be acquired when the frequency stimulus is below 10 5 Hz. When the stimulus frequency is 100 Hz, or the lowest limit, the probe is unable to deliver the signal because the stimulus frequency is too low to generate proper inductance to the target or the nominal of the mutual inductance between the probe and the target is very small, and the probe cannot work properly [28].…”

Section: Resultsmentioning

confidence: 99%

Study of the System Response Analysis for the Eddy Current Test Crack Assessment on SS 316 Metal Arc Welding Joints

Pribadi,

Rusnaldy,

Haryadi

2024

Int. J. Adv. Sci. Eng. Inf. Technol.

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In modern industry, accurately assessing metal coupling by welding is critical. Given its reliability and other advantages, the eddy current test (ECT) is essential and commonly used in metal processing, especially welding. The classical ECT assesses the presence of discontinuities in the structure by monitoring the change in the probe's impedance. According to the wireless power transfer (WPT) theory, ECT members will exchange power wirelessly through mutual induction determined by inductance, capacitance, and resistance (LCR). The cracks will affect the mutual induction in the ECT's power exchange. Since LCRs are impedance components, the crack in the target will affect the system’s mutual induction, as it did to the impedance in the classical ECT. This study applies the WPT model of ECT, implements system response analysis to assess cracks, and compares the results with classical ECT. The test piece is a metal arc-welded joint on SS 316 with an implanted notch on the welded joint to simulate the crack. A series of initial tests were performed to ensure the test piece was defects-free. Simulation and a frequency scan were performed to acquire a safe measurement. The result was that both the classical ECT and the system’s response analysis successfully assessed the presence of cracks with excellent agreement. The system’s response analysis yields a more rapid result than classical ECT.

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Section: Resultsmentioning

confidence: 99%

Study of the System Response Analysis for the Eddy Current Test Crack Assessment on SS 316 Metal Arc Welding Joints

Pribadi,

Rusnaldy,

Haryadi

2024

Int. J. Adv. Sci. Eng. Inf. Technol.

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“…The analysis of the change in the phase of the third harmonic was carried out by the method of higher harmonics [8] using the angle φ 3 on a phase and amplitude analyzer.…”

Section: Materails and Methodsmentioning

confidence: 99%

Analysis of patterns in the formation of phase composition during thermal and thermocyclic treatment of maraging steel

Juraeva,

Voroshilova,

Yarashov

et al. 2024

E3S Web of Conf.

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The paper studies changes in the phase composition of typical maraging steel. The analysis performed made it possible to determine the amount of retained austenite depending on the modes of thermal and thermocyclic treatment with heating in the temperature range of α-γ transformation. The processes occurring during heating in the region of α-γ transformation are divided into two temperature regions. As a result, it is noted that the identified patterns in the formation of the phase composition during thermal and thermocyclic treatment with the temperature range of α-γ transformation make it possible to both control changes in the phase composition and properties of steel and predict these changes.

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“…ECT is a well-established electromagnetic NDT technique, widely implemented in industry to detect damage or changes in the material properties of electrically conducting (typically metallic) components [64][65][66]. ECT plays an important role in numerous industries, especially in material coating, nuclear and oil & gas for detection of defects in metal pipelines [67][68][69][70].…”

Section: Ectmentioning

confidence: 99%

Non-destructive examination (NDE) methods for dynamic subsea cables for offshore renewable energy

et al. 2022

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Offshore renewable energy installations are moving into more challenging environments where fixed foundations are not economically viable, forcing the development of floating platforms. Subsea cables are critical for transfer of the power generated back to shore. The electrical capabilities of subsea cables are well understood; however, the structural capabilities are not, subsea power cable failures accounting for a significant proportion of insurance claims. Cables are challenging to repair, with specific vessels and good weather windows required, therefore making operations very costly. A good understanding of the internal structure of a subsea cable, and interaction between the layers, is integral to the development of robust and reliable, high voltage, dynamic, subsea cables. A requirement therefore exists for non-destructive examination (NDE) of live subsea cables to determine locations, and identify the causes, of faults and classify their type. An NDE framework such as this would assist in planning operations and reduce the risk and cost inherent to delivering offshore power. Improved understanding of subsea cable failure modes and mechanisms could also be achieved through us of NDE during onshore, dry, experimental testing. Three currently available NDE methods are considered, developed for use in other disciplines, for the purpose of structural monitoring of subsea power cables during onshore evaluation testing. The NDE methods were: i) thermography, ii) eddy current testing (ECT), iii) spread spectrum time domain reflectometry (SSTDR). The methods are assessed with regards to the information that could be obtained from both a static and oscillating cable in pilot physical tests. The results of the testing were promising, with cable motions and interlayer movements being detected by all techniques to various degrees.

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Lift-off invariant inductance of steels in multi-frequency eddy-current testing

Cited by 21 publications

References 41 publications

Study of the System Response Analysis for the Eddy Current Test Crack Assessment on SS 316 Metal Arc Welding Joints

Study of the System Response Analysis for the Eddy Current Test Crack Assessment on SS 316 Metal Arc Welding Joints

Analysis of patterns in the formation of phase composition during thermal and thermocyclic treatment of maraging steel

Non-destructive examination (NDE) methods for dynamic subsea cables for offshore renewable energy

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