Non-destructive testing. Pulsed eddy current testing of ferromagnetic metallic components

2017 ◽  
Keyword(s):  
Eddy Current ◽  
Eddy Current Testing ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Current Testing ◽  
Pulsed Eddy Current ◽  
Non Destructive

scholarly journals Physic perspective fusion of electromagnetic acoustic transducer and pulsed eddy current testing in non-destructive testing system

2020 ◽  
Vol 378 (2182) ◽  
pp. 20190608
Author(s):  
Wei Guo ◽  
Bin Gao ◽  
Gui Yun Tian ◽  
Dan Si
Keyword(s):  
Eddy Current ◽  
Surface Defects ◽  
Eddy Current Testing ◽  
Non Destructive Testing ◽  
Electromagnetic Acoustic Transducer ◽  
Destructive Testing ◽  
Current Testing ◽  
Pulsed Eddy Current ◽  
Acoustic Transducer ◽  
Non Destructive

Comprehensive non-destructive testing (NDT) for pipelines is a critical and challenging task. This paper proposes a novel physic perspective fusion NDT method of electromagnetic acoustic transducer (EMAT) and pulsed Eddy current testing (PECT) for detecting hybrid defects. This transceiver-integrated fusion sensor structure can simultaneously excite ultrasound and pulsed eddy current. Therefore, the generated ultrasound is applied to detect deep defects, while the eddy current detects surface defects. The theoretical derivation of EMAT and PECT fusion mechanism has been developed for analysis and interpretation of the results. In addition, numerical simulation on the detection of hybrid defects including surface defects with different width, depth and multiple bottom-thinning defects has been conducted. Experiments on both ferromagnetic and non-ferromagnetic material verify the feasibility of composite detection. Finally, tests have been validated on pipeline with weld defects, and the results show that the composite inspection method is capable of monitoring thickness variations and inspecting surface defects. This article is part of the theme issue ‘Advanced electromagnetic non-destructive evaluation and smart monitoring’.

A review of two types of non-destructive testing technique for pressure pipelines

2021 ◽  
Vol 63 (6) ◽  
pp. 326-333
Author(s):  
Jingui Cheng ◽  
Lei Xu ◽  
Li Chao
Keyword(s):  
Eddy Current ◽  
Skin Depth ◽  
Eddy Current Testing ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Near Surface ◽  
Current Testing ◽  
Pulsed Eddy Current ◽  
Blind Area ◽  
Non Destructive

Pulsed eddy current testing (PECT) and electromagnetic ultrasonic non-destructive testing (NDT) techniques are important methods for detecting defects in pressure pipelines. Although these methods have the advantages of no contact requirement, fast detection and simple signal processing, there is a near-surface blind area in electromagnetic ultrasonic detection and pulsed eddy current detection cannot accurately detect deep locations due to the skin depth. However, these two techniques can be combined to potentially overcome their individual limitations. This paper presents an in-depth study of the use of pulsed eddy current testing and electromagnetic ultrasonic non-destructive testing techniques to detect defects in pipelines. Moreover, the basic principles, numerical simulation methods, testing systems and application characteristics of the individual methods and their combined use are discussed.

scholarly journals Modelling of scanning pulsed eddy current testing of normal and slanted surface cracks

2019 ◽  
Vol 16 (3) ◽  
pp. 1297
Author(s):  
Faris Nafiah ◽  
Ali Sophian ◽  
Md Raisuddin Khan ◽  
Ilham Mukriz Zainal Abidin
Keyword(s):  
Eddy Current ◽  
Surface Cracks ◽  
Non Destructive Testing ◽  
Font Size ◽  
Destructive Testing ◽  
Current Testing ◽  
Pulsed Eddy Current ◽  
Simulated Surface ◽  
Non Destructive ◽  
Good Agreement

<p><span style="font-family: Arial; font-size: small;">Thanks to its wide bandwidth, pulsed eddy current (PEC) has attracted researchers of various backgrounds in the attempt to exploit its benefits in Non-destructive Testing (NDT). The ability of modelling PEC problems would be a precious tool in this attempt as it would help improve the understanding of the interaction between the transient magnetic field and the specimen, among others. In this work, a Finite Element Modelling (FEM) has been developed and experimental test data have been gathered for its validation. The investigated cases were simulated surface cracks of different sizes and angles. The study involved looking at time-domain PEC signals at different spatial distances from the cracks’ faces, which would particularly be useful for modelling scanning PEC probes. The obtained results show a good agreement between the FEM and experiment, demonstrating that the modelling technique can be used with confidence for solving similar problems.</span></p>

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