Eddy Current

Circular electric currents induced in a conductive material by an alternating magnetic field. These eddy currents generate their own magnetic field, which is detected by eddy current testing equipment. Defects, cracks, conductivity changes, and permeability variations alter eddy current flow patterns. Eddy current testing is one of the fastest NDT methods and requires no couplant, making it ideal for rapid inspection of tubes, fasteners, and thin-walled components.

Physical Foundation

Understanding eddy current is fundamental to effectively applying NDT methods. Many NDT techniques rely directly on these physical principles.

Practical Impact on Inspections

This principle affects equipment selection, test parameters, inspection procedures, and data interpretation. Proper application requires understanding these physics fundamentals.

Best Practices

• Always follow applicable NDT standards and procedures
• Use properly calibrated and maintained equipment
• Ensure personnel are properly trained and certified
• Document inspection procedures and results completely
• Keep current with industry standards and best practices