EDDY Current Testing

EDDY Current Testing

Eddy Current Testing Level II Course Outline

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

Advantages of Eddy Current Testing

• Eddy current Test probe does not need to contact the part
• Eddy currents Inspects complex shapes and sizes of conductive materials
• Eddy currents are Sensitive to small cracks and other defects
• Eddy current testing detects surface and near surface defects
• This Method can be used for much more than flaw detection
• Minimum part preparation is required
• Eddy current Inspection gives immediate results
• ET Equipment is very portable

Limitations of Eddy Current testing

• Eddy current inspection is suitable for only conductive materials
• Surface must be accessible to the Eddy current probe/s
• Skill and training required to carry out eddy current inspection is more extensive than other techniques
• Surface finish and roughness may interfere with test results
• Reference standards needed for setup for every application
• Depth of penetration is limited
• Flaws such as de-laminations that lie parallel to the probe coil winding and probe scan direction are undetectable and may get detected only using specially designed Eddy current probes for such applications.