Eddy current testing
DTL Materials Tech GmbH has comprehensive quality testing methods that can meet the general requirements of any country, region, or enterprise standard. General standards for centrifugal casting: HG/T 2601-2011, ASTM A608, DIN 10295, JIS G5122... The figure shows the use of eddy current testing equipment to detect the internal smoothness of centrifugal cast pipes.
Eddy current testing is suitable for surface and subsurface testing of conductive materials.
Eddy current testing is a non-contact detection method mainly suitable for detecting surface and near surface defects of conductive metal materials. This detection method does not require the use of coupling agents, is fast and easy to automate, and is particularly suitable for surface and subsurface detection of conductive materials. The advantages of eddy current testing include:
1. Applicable to conductive materials: Eddy current testing is only applicable to conductive materials, as eddy currents can only be generated in conductive materials for testing.
2. Surface and subsurface testing: Eddy current testing has high sensitivity for detecting defects on the surface and near surface of conductive materials, and can detect cracks, defects, etc. on the material surface.
3. No need for coupling agent: No coupling agent is required in the eddy current testing process, simplifying the testing process.
4. Fast speed and easy automation: Eddy current testing is extremely fast and easy to automate, suitable for large-scale industrial testing.
5. Suitable for the detection of irregular materials and small parts: Eddy current testing is also suitable for the detection of irregular materials and small parts, and can adapt to workpieces of different shapes and sizes.
6. Can be tested at high temperatures: Eddy current testing can be performed at high temperatures, unaffected by material temperature, and is suitable for testing workpieces after heat treatment.
However, eddy current testing also has its limitations, for example, due to the influence of eddy current penetration effect, it is mainly suitable for inspecting surface and near surface defects of metals, and it is more difficult to detect internal defects in deep layers of metal materials. In addition, there are many influencing factors of eddy current effect, and it is still difficult to qualitatively and quantitatively determine defects. When using different detection coils to inspect different workpieces, each has its own shortcomings.
