Eddy Current Testing (ET) - Level I

Training Course objective:

This course prepares a candidate to conduct Eddy Current Inspection and

  1. Perform specific calibrations
  2. Specific NDT
  3. Specific evaluations for Accept or Reject Determinations according to written Instructions
  4. Recording results

Level I Course outline


  1. Types of Discontinuities: Inherent, Processing and Service
  2. Casting Discontinuities: Hot Tear, Cold Shut, Porosity, Shrinkage
  3. Primary Processing Discontinuities including discontinuities in Rolling, Forging, Drawing, Extruding
  4. Secondary Processing Discontinuities including discontinuities in Grinding, Heat Treating, Machining, Welding, Plating
  5. Service Discontinuities:- Erosion, Wear, Fatigue, Corrosion, Creep


  1. Electrical Parameters
  2. Resistance
  3. Inductance
  4. Impedance


  1. Faradays Law
  2. Lenzs Law

Eddy Current Theory

  1. Generation of Eddy Currents
  2. Impedance changes by Eddy Currents
  3. Effect of change of impedance on instrumentation

Impedance Curves

  1. Conductivity Curve
  2. Lift Off Curve
  3. Permeability

Types of Eddy Current Sensing Elements

  1. Probes
    • Absolute
    • Differential
  2. Lift-off
  3. Theory of operation


  1. Inspection of Non-Ferromagnetic Materials
  2. Inspection of Ferromagnetic Materials

Special Probes

  1. Lift Off Insensitive
  2. Fastener Probes- Ring Probe

Calibration Standards

  1. Conductivity Standards
  2. EDM notch Surface Standards


  1. Surface Inspection
  2. Inspection of Airframes
  3. Airframe Fastener Inspection
  4. Turbine Blade Inspection
  5. Inspection of Petrochemical Piping

ET Level I Practical training

Setting up the ET instruments, selection of frequency, calibration of equipments, testing various test samples, recoding results, preparing test reports


Eddy Current Testing - Level II


Training course objectives

  1. Describe the basic principles of the eddy current test method
  2. List several applications of the eddy current test method
  3. List the types of discontinuities detected with the eddy current test method
  4. Describe the cause and effect of various types of discontinuities
  5. Describe the operational steps in the eddy current test and understand the importance of each step following a written procedure
  6. Interpret and evaluate the test results with respect to the applicable standards
  7. Complete the required test reports, and prepare a clear and concise written instruction (Procedure)
  8. Locate defects in various materials, components and structures with a high probability of detection

Level II Course Outline

Electromagnetic Testing

  1. Fundamentals
  2. Electromagnetic field generation
  3. Properties of eddy current
  4. Effects of varying frequency
  5. Phase discrimination
  6. Sensors Electromagnetic testing
  7. Basic types of equipment; types of read out
  8. Reference standards
  9. Applications and test result interpretation
  10. Flaw detection
  11. Conductivity and permeability sorting
  12. Thickness gauging
  13. Process control

ET Level II Practical Training

Setting up the Instrument, Selection of Frequencies for Tube Inspection, Selection of Probe Size, Calibrations, Depth Curve, Data Acquisition, Test on Various Samples, Prepare test report

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