Eddy Current Testing (ECT) is a non-destructive testing method used to detect surface and near-surface defects in conductive materials. It operates on the principle of electromagnetic induction, where an alternating current passing through a coil generates a magnetic field. This magnetic field induces circulating currents, known as eddy currents, in the conductive material being tested.

A defect in the conductive material disturbs the path of eddy currents, creating a local magnetic field that changes the balance of the system. This can be detected by measuring the changes in impedance in the coil, which is an informative sign of the presence of defects.

Characteristics of Eddy Current Testing:

  1. Suitable for nonferrous tubing such as SS304/316, brass, titanium, Inconel, copper, copper-nickel, etc.
  2. Can detect pits, corrosion, erosion, and axial cracking.
  3. Uses multiple frequencies for better analysis and flaw sizing.
  4. The probe needs a good fill factor to remain sensitive (about 0.85 to 0.9).
  5. Probe cantering is important for uniform sensitivity and a reduced lift-off signal.
  6. Very fast technique, up to 2 m/s pulling speed.

     

 

 

 

 

 

 

Advantages:

  1. Inspection speeds up to approximately 60 feet per minute.
  2. Distinguishes between ID and OD flaws.
  3. Can detect gradual wall thinning and localized flaws.
  4. U-bend tubes can be inspected with some radius limitation.
  5. By using multi-frequency techniques, flaws under the support plates (baffles) can be found and evaluated accurately.
  6. Permanent records can be obtained on test results.
  7. High sensitivity to small defects (diam. holes/pits > 0.5 mm)

Limitations:

  1. Limited to only non-magnetic tube material.
  2. Application is limited to 3-inch tube sizes and 0.125 wall thickness.
  3. Requires high inspection skills for data analysis and evaluation.
  4. Discontinuities adjacent to end sheets are difficult to detect.

Why Choose TCR Advanced for ECT?

TCR has an in-house team of Eddy Current Testing professionals (Level II and III) with deep expertise in inspecting a number of tubing including multi frequency, eight channel eddy current system capable of inspecting any heat exchanger tubes.

TCR Advanced has the best testing devices that are portable, contact-less and provide immediate feedback including equipment for performing ECT – Olympus MS5800, Eddyfi and SG NDT.

At TCR Advanced, we pride ourselves on our comprehensive in-house facility dedicated to tube manufacturing. With a robust inventory and state-of-the-art equipment, we are equipped to meet your needs for high-quality calibration tubes and probes.

We boast an inventory of over 200 calibration tubes and probes, offering you a variety of options to suit your specific requirements. This extensive selection allows us to cater to diverse industries and applications, ensuring you find exactly what you need without unnecessary delays.

Conclusion :

At TCR Advanced Engineering Pvt. Ltd., the implementation of eddy current testing has proven to be a highly effective method for ensuring the integrity and reliability of our materials and components. This non-destructive testing technique allows us to detect surface and near-surface defects with precision, ensuring that any potential issues are identified before they can lead to failure.