Eddy Current Inspection (ET) Systems & Equipment by ATG

Table of Contents
ATG develops and manufactures a range of customizable and automated ET systems (lines, manipulators) for rotational or longitudinal products (including specialized parts for the railway, automotive, and aerospace industries). ET systems are based on Rohmann equipment. The mechanical, motion and control parts of lines or manipulators are designed, produced, and programmed in ATG Ltd.
ATG develops advanced MPI and FPI equipment and systems for high-precision inspection in production and maintenance and across multiple industries.
Explore automated testing of aircraft wheels and other ET solutions designed for reliable inspection in aerospace maintenance.
Advance your professional qualification through internationally recognized ASNT 9712 certification through ATG CERT.
Verify your NDT lab Proficiency by accredited Proficiency Testing Provider. Verification of NDT personnel proficiency is also available.

How does Eddy Current Testing work?

Eddy current testing works by inducing circulating electrical currents, called eddy currents, in a conductive material using an alternating magnetic field. Flaws, cracks, or changes in material properties disturb these currents. The resulting variations are measured to detect and characterize defects without damaging the component.

What is Eddy Current Testing (ET) and how is it used in NDT?

Eddy Current testing (ET) is a non-destructive testing (NDT) method that uses electric currents to detect and characterize discontinuities in industrial components. The technique works by inducing electric currents in the material and analyzing the resulting response to identify defects and gather information about the internal structure of the tested part.

 

Eddy Current testing uses one or more coils in various configurations to generate and detect eddy currents in conductive materials. It is ideal for identifying surface and even near-surface discontinuities,provided certain conditions are met, while providing immediate feedback about the presence of defects.

 

ET is highly versatile and can be applied through a range of techniques, making it suitable for use in a diverse array of industries and environments, from aerospace and automotive to energy and heavy machinery. Its ability to provide rapid, reliable inspection results without damaging the component makes ET a key tool in quality control and maintenance programs.

ET Systems and Equipment for Testing Various Parts

Aircraft wheels and rotating parts

Wheel Tester AWT 950 NG enables fully automatic testing of front and main aircraft wheels from major wheel manufacturers for both Boeing and Airbus.

Application: Aerospace

Rotary parts – ball stubs, axle flanges, bearing rings, and rollers

We provide ET systems for industries where there is demand for high-speed, in-line inspection, advanced data acquisition, and processing which together ensure reliable yet fully automated detection.

Application: Automotive

Metal bars

The BARSCAN ET/UT System is used for testing round metallic bars with diameters from 10 to 130 mm. It provides high-speed, in-line inspection.

Applications: Casting, forging, or machining companies

Eddy Current testing of aircraft wheels - Precision you can rely on

Our customer, Korean Air, relies on the AWT 950 NG for fully automated Eddy Current non-destructive testing, which provides reliable defect detection on aircraft wheel rim surfaces.

 

The system is designed for daily operation in wheel shops and production environments, automatically inspecting front and main landing gear (NLG and MLG) wheels from all major manufacturers; supporting diameters from 150 mm to 950 mm, heights up to 450 mm, and a maximum weight of 120 kg.

 

Fully automated operation saves time and costs. Comprehensive data archiving and processing ensure repeatable results and support modern aircraft maintenance programs.

Add Eddy Current examination to your Qualification

The deliveries of our ET systems are joined with the possibility to qualify NDT operators and provide on-the-job training in ATG Training Center where there are disposable training ET lines, or directly on equipment delivered to the customer ́s site.

Frequently Asked Question (FAQ)

What are the advantages of Eddy Current Testing (ET) in NDT?
Eddy Current testing in NDT offers fast inspection, making it ideal for high-speed production. The method is highly versatile, capable of detecting surface defects, near-surface defects, measuring material properties, as well as evaluating composition or heat treatment. Additionally, portable or automatable ET equipment enable a range of suitable applications for both on-site inspections and large-scale testing.
Electromagnetic testing is primarily limited to conductive materials and is sensitive to surface condition, coatings, and contaminants; all of which can affect accuracy. It is generally best suited for detecting surface and near-surface defects. Interpreting ET signals requires skilled operators or automation to ensure reliable testing results.
Eddy currents are circulating electrical currents induced in a conductive material that are strongest at the surface and weaken with depth. Surface defects or changes in material properties, such as thickness or conductivity, disrupt these currents. The resulting variations are measured to identify flaws and are done so without damaging the component.
Eddy Current Testing is used to inspect critical infrastructure in the oil, gas, power generation, and nuclear industries. It helps detect corrosion, cracks, and other defects in pipelines, turbines, generators, and reactor components. Regular, qualified, and calibrated inspection ensures the safety, reliability, and efficiency of energy systems.
Eddy current testing is primarily for detecting surface and near-surface defects, as the induced currents weaken with depth (depending on the material being tested). While small subsurface flaws may cause some signal, deeper defects are generally difficult to detect, making ECT ideal for applications where surface integrity is critical.
Eddy current testing is suitable for conductive materials such as aluminum, copper, and certain steels. Non-conductive materials like plastics, ceramics, or composites cannot be tested using ECT, as no eddy currents can be induced.

Eddy Current can detect surface and near-surface defects, including cracks, corrosion, wear, as well as variations in material thickness or conductivity. It is especially useful for identifying flaws that could compromise structural integrity in critical applications.

Yes, but the effectiveness depends on probe type, frequency, and access to the surface. Skilled operators can adapt probes and scanning techniques to inspect curved or intricate components. Very deep or highly irregular geometries may limit detection sensitivity.

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Check out our other systems and equipment for non-destructive testing.

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