The testing procedure uses an ECT probe, which is a coil of conductive wire that is excited by the alternating electric current. The coil generates a changing magnetic field using an alternating current, which interacts with the component generating eddy currents. When used together with ultrasonic methods, eddy current testing can be optimized for superior accuracy and resolution. Notice the spike in the eddy current signal, confirming that there is a defect in the component. Remote field testing is associated with eddy current testing and the term "Remote Field Eddy Current Testing" is often used when describing remote field testing. Traditional Nickel Plating, Cost Difference between Electroless Nickel and Traditional Nickel. The method is highly sensitive to variations in wall thickness and tends to be less sensitive to fill-factor changes between the coil and tube. Eddy current inspection is one of several NDT methods that use the principal of electromagnetism as the basis for conducting examinations. By closing this message or continuing to use our site, you agree to the use of cookies. Di Gianfrancesco, in Materials for Ultra-Supercritical and Advanced Ultra-Supercritical Power Plants, 2017. Eddy currents were first observed by François Arago in 1824, but French physicist Léon Foucault is credited with discovering them in 1855. Factors that affect Eddy Current Inspection. Throughout this brief guide to eddy current testing,we will examine its history, how it works, its function and the many advantages the process offers. All Rights Reserved BNP Media. Higher frequencies reduce the depth of penetration and increase the phase difference between near and far defects making it easier to detect and differentiate smaller defects; lower frequencies increase the depth of signal penetration, enabling deeper testing to be carried out but at the cost of reduced defect sensitivity. John Hansen is the managing director of Ether NDE. All Sponsored Content is supplied by the advertising company. For raw and processed materials conductivity measurement can determine the purity of the metal. Skilled operators are needed to understand the instruments of the ECT testing process and detect issues with materials. The presence of any flaw will cause a change in the eddy current field and a corresponding change in the phase and amplitude of the measured signal. By 2020, the NDT equipment market for magnetic and electromagnetic equipment is projected to be over $220 million. However, care must be taken to ensure that the orientation of flaws is correct for detection and that long defects will not be ignored. The difficulties encountered in the testing of ferromagnetic tubes can be greatly alleviated with the use of the remote field testing method. Analysts can scan for anomalies on a surface and subsurface level with ease and accuracy—but ECT is not without its limitations, especially when it comes to comprehensive inspections. Copyright © 2020 Elsevier B.V. or its licensors or contributors. Operators must have an intricate knowledge of how to select the proper probe, which fits the geometry of the part and coil to produce the proper current flow. Today, eddy current testing companies are in high demand. Three Recommendations to Achieve Game-Changing Results Using AI-Powered Visual Inspection, Creating Dynamic Collaborative Zones Where Humans and Robots Can Work Together, Click link to our social media page to tell us more, Quality Brain Teasers: Real World Challenges to Build Your Manufacturing Skills (ebook), Provides a faster scanning speed than conventional ultrasonic testing (UT), Eddy current testing can be used through several millimeters of coating, Can detect very small cracks in or near the surface of the material, Physically complex geometries can be investigated, The probe does not necessarily have to be in contact with the test object. Figure 2 shows the range of application types of eddy current inspection. only Conductive materials can be examined; Limited penetration in test objects; Several variables simultaneously affect the output indication. Eddy current testing instruments must also always be calibrated to the proper standards for each test. Eddy current inspection gives stronger signals from a flaw when that flaw is closer to the surface of the material. As the eddy currents and their magnetic field flow through the metal testing material, they will continually interact with the coil and its magnetic field through induction. In order to successfully assess flaws or any of the below factors, we must be able to minimize the effect of other factors on the results. Eddy Current Testing and Industry. In some cases, a surface finish or the roughness of the material can impact testing. However, because of the large volume of metal present as well as potential permeability variations within the product, these specialized eddy current probes are still limited in their inspection capabilities.

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