Eddy Current Testing (ET) Services
Eddy Current Testing uses electromagnetic induction to detect surface and near-surface flaws in conductive materials.
What is Eddy Current Testing?
Eddy Current Testing (ET/ECT) is an electromagnetic NDT method used to detect surface and near-surface flaws in electrically conductive materials. An alternating current-carrying coil is placed near the test surface, inducing eddy currents in the material. Defects or material property changes alter the eddy current flow, which is detected as changes in the coil impedance.
How ET Works
AC coil generates alternating magnetic field
Eddy currents are induced in conductive material
Defects alter eddy current flow patterns
Impedance changes detected and analyzed
Applications of Eddy Current Testing
Advantages
- No couplant required
- Fast scanning speed
- Can inspect through coatings
- High sensitivity to surface cracks
- Automated inspection capability
- No surface preparation needed
Limitations
- Only works on conductive materials
- Limited penetration depth
- Sensitive to lift-off variations
- Reference standards required
- Geometry can affect results
Applicable Standards & Codes
Industries Using ET
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Other NDT Methods
Ultrasonic Testing uses high-frequency sound waves to detect internal flaws, measure material thickness, and characterize material properties.
Learn moreRadiographic Testing uses X-rays or gamma rays to create images of a component's internal structure, revealing hidden defects.
Learn moreMagnetic Particle Testing detects surface and near-surface defects in ferromagnetic materials using magnetic fields and iron particles.
Learn moreLiquid Penetrant Testing reveals surface-breaking defects by applying a colored or fluorescent dye that seeps into cracks and discontinuities.
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