NDT 205 - Electromagnetic Testing (ET) Level II

3 Credits, 3 Contact Hours
3 lecture periods 0 lab periods

Provides a thorough grounding in the principles of eddy current testing and the fundamentals of engineering, materials, and components. Introduces and prepares the student for flaw detection with the use of surface scan and rotary scan procedures. Also includes a basic understanding of all the eddy current methods.

Prerequisite(s): NDT 105
  

1. Demonstrate proficient knowledge of how to select the proper equipment for certain procedures.
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 of alternating current field measurement, flux leakage, and remote field eddy current methods.

1. Selection of Test Frequency
   1. Test frequency
   2. Depth of penetration
   3. Single frequency
   4. Dual frequency 
   5. Coupling
   6. Lift-off and fill factor
   7. Lift-off
   8. Fill factor
2. Electromagnetic Testing Applications
   1. Eddy current applications
   2. Aerospace applications
   3. Measurement of metal and thickness coating
   4. Reference standards
   5. Test of metal conductivity
   6. Testing of bolt holes
   7. Testing of aircraft structures
   8. Chemical and petroleum applications
   9. Primary metal industries 
3. Factors Affecting Flux Leakage Fields
   1. Defect geometry, location and orientation
   2. Subsurface discontinuities
   3. Degree of initial magnetization
4. Selection of Magnetizing Method
   1. Permanent magnets
   2. Electromagnets
   3. Right hand rule
   4. Testing in the residual field
   5. Magnetizing by direct current
   6. Magnitudes of magnetic flux leakage fields
5. Flux Leakage Applications
   1. Heat exchanger and boiler tubes
   2. Wire rope inspection
   3. Round bars and tube testing
   4. Petroleum and gas pipeline testing
   5. Above ground storage tank testing
6. Remote Field Testing
   1. Probe configuration
   2. Probe fill factor
   3. Probe speed
   4. Frequency selection
   5. Remote field testing application
   6. Sensitivity
   7. Reference and calibration standards
7. Alternating Current Field Measurement
   1. Principle of operation
   2. Signal analysis
   3. ACFM
   4. Advantages
   5. Disadvantages
   6. Alternating current field measurement indications
8. Standards and Procedures
   1. Calibration standards
   2. Reference standards
   3. Standards and specifications
   4. Standards and industry specifications