Eddy Current Testing

Eddy Current Testing is a non-contact, electromagnetic inspection technique used to assess conductive materials without requiring the removal of non-conductive coatings. In this method, an alternating current is passed through a coil, generating an alternating magnetic field that induces localized currents (eddy currents) in the material being tested. Discontinuities, such as fatigue cracks, disrupt the flow of these eddy currents, which in turn alters the terminal impedance of the test coil. By analyzing the amplitude and phase of the received signal, the severity and exact location of any discontinuities can be determined. Eddy current testing is commonly used to inspect a wide variety of materials and components in industries such as oil and gas, nuclear, power generation, and aerospace.

Training Days

Eddy Current Testing (ET) – 10-Days Course for Surface Inspection suitable for SNT Level 2 (80 Hours)

Course Outline

General Theory
  • Brief history and development of eddy current testing
  • Basic principles underlying eddy current testing
  • Generation of eddy currents through an alternating current (AC) field
  • Effects of fields created by eddy currents on materials
  • Understanding how impedance changes affect instrumentation
  • Terminology and units used in eddy current testing
  • Principles of magnetization in eddy current testing
  • Fundamentals of electromagnetism theory
  • Flux leakage theory and its application in testing
  • Readout mechanisms for interpreting test results
  • Different types of eddy current sensing elements
  • Flux leakage sensing elements and their role in testing
  • Review of electromagnetic theory related to eddy current testing
  • Factors affecting coil impedance
  • Impact of flux leakage fields on testing results
  • Signal-to-noise ratio considerations
  • Selecting appropriate test frequencies for various applications
  • Choosing the correct method of magnetization for flux leakage testing
  • Coupling considerations in eddy current testing
  • Field strength and how to select it for effective testing
  • Field orientation for flux leakage testing
  • Instrument design considerations for eddy current testing
  • Safety measures, including electrical safety, specific to eddy current testing
Specific Theory
  • Application of eddy current testing tailored to the company's specific needs, with reference to relevant codes, standards, and procedures, and including control checks required by the company
Sector-Specific Practicals
  • Extensive hands-on practical training focusing on real-world applications of eddy current testing in various sectors

What are the responsibilities of an individual who is certified to Eddy Current Level 2?

A professional certified to Eddy Current Testing(ET) Level 2 has proven their capability to perform Non-Destructive Testing (NDT) in compliance with established UT procedures. Within the scope of competence outlined on their certification, Level 2 personnel may be authorized by their employer to:

  • Select the Eddy Current technique for the test method to be used based on the material, type of defect, and testing conditions.
  • Define the limitations of the application of the testing method, including material type, size of defects, and specific testing conditions.
  • Translate NDT codes, standards, specifications, and procedures into practical NDT instructions tailored to the specific working conditions and requirements of the company.
  • Set up and verify equipment settings, ensuring that the correct test parameters, frequencies, and configurations are applied for accurate results.
  • Perform and supervise tests, ensuring compliance with established procedures and accuracy in execution.
  • Interpret and evaluate results in accordance with applicable standards, codes, specifications, or procedures, identifying any defects or anomalies present in the material being tested.
  • Prepare Eddy Current written instructions, documenting the testing process, methodology, and findings for future reference and compliance.
  • Carry out and supervise all tasks at or below level 2, ensuring proper execution and adherence to safety protocols.
  • Provide guidance for personnel at or below level 2, offering direction and expertise during testing and analysis.
  • Report the results of Eddy Current tests, presenting findings in a clear and detailed manner, highlighting any defects or anomalies and their implications.