Eddy-Current Testing Services
Detect the Smallest Flaws with Eddy-Current Testing
If you need to detect flaws in conductive material, eddy-current testing is one of the most reliable ways, giving you the capability to detect very small cracks in or near the material’s surface.
TÜV Rheinland technicians have numerous years of experience with this type of conductive material inspection and are able to set up individual testing parameters to best meet your needs.
Benefits at a Glance
With eddy-current testing services from TÜV Rheinland, you can be sure of:
- Fast results with a portable device
- A lead against the competition with a neutral audit seal
- Reduced risk of company liability with documented safety standards
- Fast audit times and our long-standing experience
- Showing how high your high-quality standards are
- TÜV Rheinland’s exclusive, one-stop service
- Compliance with local government and legal requirements
Approach
A circular coil carrying current is placed in proximity to the test specimen (electrically conductive). The alternating current in the coil generates a changing magnetic field, which interacts with the test specimen and generates eddy current.
Variations in the phase and magnitude of these eddy currents can be monitored using a second “search” coil or by measuring changes to the current flowing in the primary “excitation” coil.
The machine can be set up to accept parts within a certain range of signal interpretation. This is done by utilizing a series of known good samples that are run through the coils to calibrate the machine. Then the different pieces are tested. Parts that fall outside this range are rejected, usually with a red indicator light.
More Information
Eddy-current testing uses electromagnetic induction to detect flaws in conductive materials. It can detect very small cracks in or near the surface of the material.
Parts capable of inducing current are put in contact or near a probe that emits electromagnetic currents through the part. The probe also looks for changes in how the current travels through the part. It picks up the changes and shows the irregular flow. This process can detect slight changes in the piece being inspected. The changes may be due to a hardness difference, change in material, or a void or crack in the part.
The material surface needs minimal preparation, and physically complex geometries can be investigated. It is also useful for making electrical conductivity and coating thickness measurements.
Eddy-current testing equipment is relatively expensive and complex in nature, so having experienced personnel and quality equipment is a must.
Related Services from TÜV Rheinland
If you’re interested in TÜV Rheinland’s eddy-current testing services, you may also be interested in our tube inspection services.