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Eddy Current Testing

Eddy Current Validastes Product Integrty

Eddy current evaluation was historically used for the testing of Bar, Tube and Wire materials, Given those successes, it was also used to inspect the inside of Tubing for Corrosion and voids in critical applications such as Pipe lines and Heat exchangers. The benefits of eddycurrent testing methods Fast, Reliable Easy to Use, Save time, Reduce Scrap, Ship consistently Good products.

Eddy Current Testing Applications are as Follws :
  • Crack testing on Automobile, Aerospace, Refinery, Power plant Equipments, Etc.
  • Tube inspection (Non Ferrous and Ferrous materials)
  • Material thickness measurements.
  • Coating thickness measurements.
  • Conductivity measurement for:
  • Material identification (Chemical composition)
  • Heat damage detection
  • Case depth determination.
  • Heat treatment monitoring.

Eddy Current Validastes Product Integrty

  • Sensitive to small cracks and other defects
  • Detects surface and near surface defects.
  • Inspection gives immediate results.
  • Equpment is very portable.
  • Method can be used for much more than flaw detection.
  • Minimum part preperation is required.
  • Test probe does not need to contact the part.
  • Inspects complex shapes and sizes of conductive materials.

Eddy Current Tube Inspection

Heat exchangers is the No. 1 application of ECT in power plants and petrochemical plant,s Heat exchangers include condensers, General petrochemical plant exchangers, Feed water heaters, Air coolers and Lube oil Coolers.

Both the conventional ECT and Remote field ECT are used for inspection. Convetional ECT is used for inspection of Non Ferromagnetic tubing such as 300 series stainless steel, admirally brass, copper nickel Alloys, Hatelloy, Titanium, Monel etc

Remote field ECT is applicable for inspection of Ferromagneticf tubing such as carbon steel etc.

Advantages of Eddy Current over Tube Inspection :
  • Very fast and immediate results.
  • In service inspection can be done to avoid failures.
  • Wall thinning of tubes can be found.
  • Both outside defects and inside defects can be observed.
  • Through holes can be found.
  • Very accurate and reliable.
Eddy Current Crack and flaw component Testing :

While an encircling or rotating eddy cureent probe works well for finding cracks and flaws in bar, tubing, and wire more sophisticated designs are needed for testing complex components. As an example, Girth gear teeth and turbine blades can be inspected with profiled eddy current probes as shown in the figure.

We Manufacture and supply the follwing Eddy Current Probes and coils :
  • standard pencil, point and encircling coils.
  • Modular multi coil probe heads for parts with complex geometry.
  • Thread inspection probes.
  • Custom designed probes for specific components.
  • Differential, driver pick up, pancake coil designs
  • Adapter cables.
  • Probe mounting fixtures.
  • EDM standards.
  • Detachable, multi probe/ coil modules " save money" on damaged probes
Eddy Current Heat Treat Process Verification

While not an obsolute hardness test like a rockwell test, eddy current testing can achieve sorting results on par with rockwell testing. The advantages of eddy current testing are the speed of the test and the integration with manufacturing process.

Eddy Current Feature Verification

Because eddy currents are sensitive to the structure of a component, they can easily be used to detect anomalies like missing or misplaced threads, or incorrectly installed components. As an example, a major automative bearing supplier wanted an automated way to tell whether all the ball bearings were installed in a bearing race. If a ball bearing was missing, the eddy current system would set off an alarm.

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