Eddy Current Inspection (ECI)

ECI is a technique utilised on conductive materials (ie ferromagnetic steels, stainless steels, nimonic 80a, etc). An alternating current is applied to an inspection coil, which creates a magnetic field, when placed next to a conductor it induces an ‘eddy current’ field in the material. When this induced field is disrupted by a flaw it causes an imbalance which is magnified and shown on an oscilloscope. This can be done through non-conductive coatings to test the weld/material underneath the coating.

It can be used for crack detection, material sorting and coating measurements.

Typical site applications include inspection of crane jibs/pedestals/A-frames, deck node joints, padeyes pre/post load testing, drilling derrick substructures, bridge support members (primary and transverse beams) /  bearings etc..

Crane Inspection unloaderECI sets are not intrinsically safe (i.e. control measures and a ‘hot work spark potential permit’ may be required in explosive atmospheres), but the technique itself is non-hazardous to the operator, passers-by or machinery.

Visit our Resource Area to find out about or buy British Standards applicable to Eddy Current Inspection

 

Advantages are:

  • A high degree of sensitivity.
  • Defect depth indication also.
  • No removal of surface coating required (time saving and avoids damage to item)
  • Can be used on galvanised components and on complex shapes
  • Non-ferrous materials can be inspected
  • Immediate results/Real time testing.
  • Highly portable equipment (suitable for difficult access)

Disadvantages

Depth of penetration into the material is very limited and that the flaws detected will require further examination using other techniques, such as Magnetic Particle Inspection or Ultrasonic Testing. A high degree of training is required for use of ECI and we invest heavily in the continuing professional development of our Eddy Current inspectors.

Ask the Expert

Axiom NDT have developed an approved procedure for Eddy Current Inspection of galvanised weldments & TSA (i.e. through conductive coatings) and this is strongly recommended for in-service items such as padeye welds, racking board welds, powder coated steel on stadiums etc.. Ask the Expert

Enquire about - Eddy Current Inspection (ECI)

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