Eddy current testing is a method of non-destructive testing (NDT) that is an essential test solution for measuring surface and subsurface conditions. The process of the test measures changing impedance, commonly used for weld inspection, tube inspection, and more.
Eddy Current Testing
Eddy current testing, also referred to as ECT, is the process of running electronic probes through the length of various types of tubes or along the surfaces of materials to detect flaws. An eddy current is a current that runs opposite to the current introduced by a probe into a conductive material.
What Is an Eddy Current Flaw Detector?
Eddy current flaw detectors use the concept of electromagnetic induction to test changes in the conductivity of target materials. For example, the device can identify near-surface defects and thickness inconsistencies. The eddy current flaw detector can be used to measure distance or to detect flaws in conducting materials, including corrosion, erosion, wear, pitting, baffle cuts, wall loss, and cracks.
Eddy Current Flaw Detector Function
- Used to determine material characteristics/purity of the material
- Tube and wire testing
- Weld testing
- Heat treatment verification
- Bolt hole inspection
- CNC machining post-process inspections
- Metal fastener inspection
- Accurate coating thickness measurement
Eddy Current Flaw Detector Test Standards
The Eddy Current (ECT) Flaw Detectors are designed to comply with the requirements of ISO17643 (formally EN1711): "Eddy Current examination of welds by complex plane analysis.”
Eddy Current Flaw Detector Applications
Eddy Current non-destructive testing equipment and probes to a broad range of industries including:
- Petrochemical industry
- Oil and gas
- Power generation
- Metals processing
- Transportation industry (rail and automotive)
Benefits of Using an Eddy Current Flaw Detector
- Faster scanning speed compared to ultrasonic testing
- Minimal preparation for surfaces prior to testing
- Automated testing available
- Can test through several millimeters of coating and several layers without interference
- Ability to detect small cracks
- Large scan area