NDT 105 - Electromagnetic Testing (ET) Level I

1. Demonstrate proficient knowledge of electromagnetic testing.
2. Demonstrate proficient knowledge of the use of eddy current equipment.
3. Demonstrate proficient knowledge of how to set up and calibrate NDT equipment.
4. Demonstrate proficient knowledge and basic understanding of Flux leakage.

1. Introduction to Electromagnetic Testing
   1. Early observation of magnetic attraction
   2. Basic principles of induced currents
   3. Basic principles of flux leakage testing
   4. Personnel qualifications
   5. Personnel certifications 
2. Eddy Current Theory
   1. Generation of eddy currents
   2. Resistance
   3. Inductive reactance
   4. Impedance
   5. Phase angle
3. Eddy Current Instrumentation
   1. Eddy current instrument circuits
   2. Internal functions of eddy current instruments
4. Readout Mechanism
   1. Analog meters
   2. Digital display
5. Eddy Current Inspection Coils
   1. Surface coil
   2. Encircling coil
   3. Internal coil
   4. Test coil arrangements
   5. Factors affecting choice of sensing elements
6. Flux Leakage Theory
   1. B and H curve
   2. Lines of force
   3. Law of magnetism
   4. Flux density
   5. Right hand rule
   6. Magnetic properties of materials
7. Flux Leakage Sensing Elements
   1. Inductive coil sensors
   2. Magnetodiode
   3. Other methods of leakage field detection
8. Coil Impedance
   1. Test objects
   2. Conductivity
   3. Alloy composition
   4. Hardness
   5. Temperature and residual stress
   6. Conductive coatings
   7. Edge effect
   8. Skin effect
   9. End effect
   10. Permeability
   11. Dimensional factors
   12. Discontinuities
9. Eddy Current Test Systems and Analysis
   1. Impedance testing systems
   2. Phase analysis
   3. Cathode ray tube method
   4. Modulation analysis