Test Lab, NDT Weld Training Course Institute India Bangalore | Trinity NDT

Eddy Current Testing Services in Bangalore. NABL Lab.

Crack Detection, Material Sorting & Heat Exchanger Tubes using Eddy Current Inspection

Advanced NDT Equipment & Probes. Serving 1500+ Customers. Get the Quote now.

Eddy Current testing Service Lab in Bangalore. Experts in Crack detection, Sorting & Heat Exchanger Tube Inspection.

Eddy Current testing services lab

Welcome to Trinity NDT’s Eddy Current Testing Services. As a leading provider of non-destructive testing solutions, we specialize in utilizing the technology to ensure the integrity and quality of your materials and components.

Eddy current testing (ECT) is a surface and subsurface flaws, such as cracks, corrosion, and defects, without causing any damage to the tested material.  It is helpful for detecting cracks in ferrous & nonferrous metals. It can be applied on Aluminium, Magnesium, Stainless Steel, titanium and almost all conducting materials. 

ECT is used in Aerospace, automotive and heat exchanger tube testing and more, making it an indispensable tool for quality control. Also, a reliable method for material mix-up sorting, measuring wall thickness in manufacturing and in-service inspection of thin wall tubes and pipes.

Our services help you assess the structural integrity and material composition of various metals and alloys, ensuring safety and compliance with industry standards.


Our Eddy Current Testing Services in Bangalore, Karnataka

Eddy Current testing Services NDT Lab

Eddy current is an NDT method that can detect surface and subsurface flaws in any conductive material. Many applications are existing that use Eddy current principles. This method has applications in Aerospace Component Inspections, Heat exchanger tube inspections in Oil Gas companies. Real time non-contact wall thickness testing, Material sorting, mixing and paint thickness inspection.

We offer measurement of coating thickness to ensure coatings meet required specifications, preventing issues like corrosion under insulation. Our ECT services enable efficient inspection of heat exchanger tubes, helping you identify defects and ensuring optimal heat exchange

The method plays a crucial role in assessing the quality of welds, detecting weld defects, and ensuring weld integrity. Our testing methods can distinguish between different materials, aiding in material sorting and ensuring correct material usage.

Magnetic particle method is not suitable for Aluminium aircraft structures, thus tested using ECT principles. In fact, eddy currents can generate strong signals from fatigue cracks during in-service inspections.


Crack Detection using Eddy Current Equipment

Efficient crack detection on ferrous materials like iron, nickel, and cobalt-based alloys becomes simple. This is due to the applicability of the magnetic particle inspection method, which effectively detects cracks in all ferromagnetic materials.

Curious about non-ferromagnetic materials like Aluminum or other non-magnetic materials? Wondering if there’s a way to identify cracks in these materials? Absolutely! Eddy current testing emerges as a valuable non-destructive testing (NDT) technique for crack detection.

This method excels at identifying surface and subsurface cracks without the need for direct contact. As a result, eddy current crack detectors have taken precedence in various fields. Supplanting magnetic particle testing in scenarios where precision and rapidity are of utmost importance.

Consider railway track inspection at steel plants: eddy current machines adeptly uncover cracks. The non-contact nature swift inspections, surpassing the capabilities of ultrasonic testing without requiring couplant. At our labs, we use Olympus make equipment.

Contact us and experience our Eddy current labs in Bangalore, offering comprehensive crack testing services. Available both on-site across India and at our advanced facility in Peenya. 

Unveiling Unmatched Flaw Detection Depths with Eddy Current Inspection

Similar to Ultrasonic Testing (UT), our method offers accurate crack depth detection. The depth of crack identification in Eddy Current relies on material conductivity and current frequency. Notably, higher material conductivity leads to shallower penetration, mainly limited to surfaces. However, less conductive materials allow the detection of deeper cracks. Typically, the depth of detection reaches three times the skin depth.

Ultimately, enhancing penetration in highly conductive materials involves utilizing lower frequencies. 

Resolving Material Mix-Up Challenges: Sorting by Hardness, Composition, and Heat Treatment

Efficient Solutions for Material Sorting Challenges: Introducing Eddy Current Sorting

In workshops, material sorting or mix-up is a frequent concern arising from the diverse range of machined and heat-treated materials. When mix-ups involve variations in chemical composition, traditional methods like wet analysis or PMI are time-consuming and cost-intensive. So, what’s the optimal NDT method for precise material sorting? Enter Eddy Current sorting.

In the realm of automobile component manufacturing, a plethora of components with varying designs, chemistries, heat treatments, and properties are processed. One of the most prevalent issues on the shop floor is the inadvertent mix-up of different material grades.

Mix-ups might encompass disparities in chemistry, mechanical properties, or metallurgical structures. Here, Eddy Current sorting emerges as the cost-effective and time-efficient solution to arrive at accurate conclusions. This method is progressively gaining traction for material sorting, owing to its effectiveness.

Both portable and stationary Eddy Current machines are available, tailored to the sorting volume and speed requirements. Sorting can be executed based on chemistry, hardness discrepancies, or heat treatment conditions. Eddy Current sorting machines excel in delivering precise results, whether it’s manual sorting or automated machines for shop floor efficiency. Trinity NDT provide comprehensive material sorting solutions, catering to your specific needs.

Fast and Accurate Metal Conductivity Measurement with Eddy Current Probes


In the realm of materials, conductivity is intricately linked to metal purity. The measurement of conductivity provides a means to reasonably assess the purity level of metals. Facilitating this process are Eddy current machines furnished with specialized conductivity test probes. The unit of measure, %IACS (International Annealed Copper Standard), quantifies metal conductivity. The precision of these tests hinges on meticulous calibration prior to conducting assessments.

Our approach involves the use of NPL-calibrated conductivity samples, serving as the foundation for our standardized procedures. Are you seeking precise conductivity values or aiming for sorting based on conductivity criteria? 

At our ET labs, we are equipped with cutting-edge eddy current probes to effectively measure %IACS and cater to your needs. Text us your query on Whats app or Fill your requirement to contact us.

Accurate Coating Thickness Measurement of Conductive & Non-Conductive Coatings

Measuring coating thickness is a critical aspect of maintaining coating quality, whether during manufacturing or in-service inspections. This applies to scenarios involving conductive coatings on conductive metals or non-conductive coatings on conductive metals. Examples include paint or insulation on pipelines, or nickel and chromium plating on various metals. Eddy current machines offer a highly effective means of estimating the thickness of such coatings.

However, there’s a limitation: for optimal results, there should be a notable conductivity variation between the coating and the base material. Despite this limitation, eddy current testing remains an excellent method for assessing coating thickness.

At our NDT Labs in Bangalore, we possess coating thickness samples that are traceable to national standards, ensuring the utmost accuracy in our measurements.


Heat Exchanger Tube Inspection for Corrosion

Corrosion-induced thinning of heat exchanger tubes poses a significant risk, especially in petroleum refineries, where sudden tube failure can occur. Leveraging the power of dual-frequency eddy current bobbin probes, the detection of corrosion damage becomes feasible. These probes allow for signal suppression in the presence of noise or support plates through frequency intermixing. 

Prior to testing, tube inner surfaces need to be clean to ensure accurate results.In the realm of in-service inspections for heat exchanger tubes, modern eddy current machines have proven to be highly reliable in detecting corrosion-related issues. Our array of eddy current machines and specialized bobbin probes are perfectly suited for monitoring corrosion in heat exchanger tubes, bolstering the overall integrity and safety of operations

Why Trinity NDT - Eddy Current Testing Services?

  • Expertise: With years of experience in the field, we possess the technical know-how and practical expertise to deliver reliable ECT services.
  • Advanced Technology: We invest in the latest ECT equipment and techniques, staying at the forefront of the industry to provide you with the best solutions.
  • Tailored Solutions: We understand that each project is unique. Our team works closely with you to tailor our ECT services to your specific needs.
  • Fast Turnaround: We understand the importance of timely results. Our streamlined processes allow us to provide quick turnaround times without compromising quality.


What is the cost of Eddy current testing?

When considering the cost of eddy current testing, several factors come into play. The complexity of the inspection, the size and geometry of the component being tested, and the equipment required for the specific task are all factors that influence the overall cost.

Our charges for Eddy Current Testing in Bangalore starts from Rs.1000/-* based on component size, inspection objective, quantity and specification. We work out the optimum cost for our customers on case to case basis.

To accurately determine the cost for your specific project, it’s recommended to consult with experienced NDT professionals who can assess your requirements and provide a tailored cost estimate. Keep in mind that while the initial cost may be a consideration, the benefits of ensuring the structural integrity and safety of critical components can far outweigh the investment.

At Trinity NDT, we specialize in providing reliable and cost-effective eddy current testing services. Our team of experts can guide you through the process and offer transparent pricing based on your unique needs. Contact us today to learn more about how eddy current testing can benefit your industry while fitting within your budget.

ET Test Procedure for Heat Exchanger tubes

Eddy Current Inspection Heat Exchanger Tubes
Eddy Current Inspection Heat Exchanger Tubes in India

ET of Heat Exchanger tubes involves the following procedure (usually followed by our ET Level II technicians):

  1. Preparation: The first step is to prepare the equipment and materials needed to perform inspection. This includes setting up the eddy current testing equipment, probe, power supply, and display or recording equipment. It is also important to ensure that the surfaces of heat exchanger tubes are clean and free of debris such as corrosion deposit, as this can affect the accuracy of the test results.
  2. Calibration: The eddy current testing equipment must be calibrated to ensure that it is functioning correctly and providing accurate results. This typically involves using a corrosion reference standard or sample with known properties, and adjusting the ET equipment settings as needed.
  3. Testing: Once the equipment is set up and calibrated, the eddy current testing can start. The technician will move the probe over the surface of the heat exchanger tubes in a systematic manner, making sure to cover the entire surface. As the probe passes over the surface, it generates eddy currents in the material, which create their own magnetic fields that interact with the probe’s magnetic field. The change in impedance of the probe’s coil due to this interaction is measured and used to determine the properties of the material being tested.
  4. Information/Data analysis: The data collected during the eddy current testing process is typically displayed or recorded on a computer or other device. The Level II technician will review the data to identify any abnormalities or defects that may be present in the heat exchanger tubes. This may include comparing the data to known flaws, reference standards or using specialized software to analyze the data.
  5. Reporting: Once the eddy current testing is complete, the Level II technician will prepare a report detailing the results of the inspection. This report will include any defects or abnormalities that were detected, as well as recommendations for repair or further testing as needed.

Important Note: It is important to note that eddy current testing is typically performed by only qualified, trained and certified Level II technicians who have a thorough understanding of the principles of eddy current testing and the characteristics of the material being tested. It is also important to follow established and ASNT Level III approved testing procedures and guidelines to ensure the accuracy and reliability of the results. Check for more NDT procedures and report formats free download.

Trinity NDT – Testing Labs have the equipment, experienced technicians and ASNT Level III experts to ensure accurate and reliable test results. Contact us today to schedule inspection right at your plant across India. In addition, our NDT services are NABL accredited as per ISO17025:2017 International standard.


Online and Offline Tube Wall Thickness Measurement using Eddy Current Principle

Eddy current wall thickness measurement has emerged as a cutting-edge non-destructive testing (NDT) method, particularly effective for gauging low thicknesses, even in the range of a few millimeters on conductive materials. 

In cases where Ultrasonic machines reach their limits, Eddy Current (ET) proves to be the accurate alternative. Offers versatility, available in both contact and non-contact forms. 

Non-contact methods are particularly advantageous for online automation, especially in real-time scenarios like controlling the wall thickness of pipes, tubes, and plates during their production. It’s important to note that achieving precise test results requires a well-configured equipment setup.

In-Service Inspection for Aircraft, Helicopter Structures, and Bolt Holes

Conducting magnetic particle testing (MPI) on non-magnetic materials like Aluminium and Titanium is simply unfeasible. In the aerospace industry, Eddy Current Testing (ECT) has become a common practice for identifying fatigue cracks in aircraft skins, fastener holes, and turbine components during crucial in-service inspections. Renowned for its reliability, this method possesses the unique ability to penetrate certain surface coatings, thereby minimizing the need for coating removal and restoration. 

This efficiency translates to time and cost savings.In the aerospace realm, the need for swift testing is paramount. To address this, high-speed rotating scanners integrated into eddy current machines can rapidly detect cracks in bolt holes, ensuring minimal downtime. Our state-of-the-art labs located in Bengaluru, India, are equipped with advanced machines and probes designed to facilitate comprehensive inspections of aircraft structures.

NABL Accredited Eddy Current Testing in Bangalore

NABL, based in Delhi, is the authority that accredits testing laboratories in the realm of Nondestructive Testing services. Our Eddy Current Testing (ECT) labs proudly hold accreditation for eddy current testing in accordance with ISO 17025:2017. Feel free to download our NABL Certificate or explore the scope of our NABL accreditation.

Our impedance plane display machines come equipped with built-in defect recording, simplifying the testing process and report generation. Whether it’s crack detection, material sorting, or heat exchanger tube inspections, we’re poised to serve you with excellence from our cutting-edge NDT labs in Bangalore, India.

At ‘Trinity NDT,’ we specialize in providing dependable inspection services tailored to your specific Eddy current testing requirements. Our skilled ET NDT Level II Inspectors are well-prepared to conduct testing both in-house and on-site, operating under the guidance of ASNT Level III experts to ensure the highest quality inspections. This amalgamation of expertise enables our NDT inspectors to deliver optimal solutions for your eddy current testing needs.

Moreover, we extend ASNT NDT Eddy current testing ET Level III services, assisting with procedure preparation and approval. If you’re seeking NDT procedure development for your projects or laboratory setup, reach out to us today. Discover more about our comprehensive NDT testing services and let us cater to your inspection needs.

Ready to ensure the integrity of your materials with our Eddy Current Testing services? Contact us today to discuss your testing needs, get a
quote, or schedule a consultation. Our team is here to provide you with accurate and efficient ECT testing solutions.


Training and Certification on Eddy Current testing. Learn from Top Class Experts.

Unlock the best training opportunities for Eddy Current (ET) Level I and II certification with us. Our courses adhere to the ASNT SNT TC 1A standards, ensuring quality education. Training takes place at our state-of-the-art center in Bangalore, India, where we provide comprehensive training. We are flexible, offering the same valuable training at your location upon request. For detailed information, get in touch with our dedicated training department today.
Explore eligibility criteria, NDT Level II training schedules, and effortlessly register for courses online. Elevate your skills and expertise with our specialized Eddy current training programs. Find more about Eligibility Criteria, NDT Level II training schedule and Register for course online.

Free Eddy Current Test Procedures and Report Formats: Download PDFs Now

Seeking complimentary eddy current test procedures or report formats? Look no further. We provide valuable NDT procedures and test report formats, available for free in downloadable PDFs. 

Access and download our assortment of Eddy current testing pdf procedures and test report formats with ease.

Know more about Eddy Current Testing


When a test conducting object is brought close to the AC field of test coil, flux causes electrons to circulate in a swirling eddy-like pattern in the object; thus the term ‘eddy currents’. In other words, eddy current behavior depends on the properties of both the flux and the object itself. Therefore, eddy currents are circular AC currents caused by a varying magnetic field. It works on the principle of ‘EM induction’. If there is a change in current flow path, that will provide an indication on screen.

How Eddy Current Testing works?

In Eddy current testing, the test component is placed in a varying magnetic field of a coil carrying Alternating Current(AC). The AC magnetic field (primary) induces eddy currents in the test component. The eddy currents, in turn, produce an secondary magnetic field. As per Lenz’s law, this secondary magnetic field opposes the primary magnetic field which caused it to produce. Finally, by scanning and measuring the changes in impedance in an area of test object, cracks and material properties can be evaluated.

Major Limitation

Eddy Current testing is only suitable for electrically conducting materials such as Aluminium, Steel, Brass, Bronze, Gold etc., Testing is not possible on wood, plastics, glass and other non conducting materials. It is one of the major limitation in this NDT method.

Also, Alternating currents (AC) can only be used to generate and perform inspection. Because, to generate eddy currents, changing magnetic field is needed.

Maximum Depth of Penetration

Eddy current has skin effect, there the maximum depth of penetration is limited to three skin depths only. Beyond that current density deminishes rapidly thus reducing crack detectability exponentially. Therefore, it can detect cracks up to maximum 3-4mm based on conductivity and permeability of the material.

Difference between Ultrasonic and Eddy Current Testing

Distinguishing Ultrasonic Testing (UT) and Eddy Current (ET) Inspection

  • When it comes to non-destructive testing, Ultrasonic Testing (UT) and Eddy Current (ET) are two prevalent methods, each utilizing distinct physical principles. UT relies on sound waves, while ET employs electromagnetic waves.
  • In terms of frequencies, UT operates within the range of 20kHz to 25MHz, while ET utilizes a frequency spectrum spanning from 50Hz up to 15MHz.
  • A significant divergence lies in the use of couplant. UT mandates the use of a coupling medium, whereas ET does not require any couplant.
  • Moreover, contact is essential in UT inspections, whereas ET operates effectively without the need for physical contact.
  • Comparing inspection speeds, ET takes the lead with significantly faster inspection rates compared to UT.
  • Functionally, UT specializes in identifying internal flaws, while ET excels in detecting surface and subsurface flaws.
  • Furthermore, the material being tested is a crucial consideration. UT can be applied to any object that conducts sound, whereas ET necessitates the material to be an electrical conductor.
  • By understanding these distinctions, one can make informed decisions when choosing between UT and ET for specific non-destructive testing needs.

ECT Over PMI for Material Sorting

Though Positive Material Identification (PMI) testing is widely used, eddy current testing (ET) is increasingly becoming popular NDT technique for materials sorting. Because, PMI is comparatively expensive and also, time consuming. However, the former method gives actual chemistry of material, whereas in later method, it is comparison of known with unknown, similar to go and no-go type gauge inspection. ET testing is preferred for sorting due to 3 major reasons;
  • Speed of inspection
  • Portability of ET equipment
  • less initial equipment cost


Want to learn more about Eddy Current testing & Join our ET Level 1, 2 training Course today? Contact us for information on courses eligibility, fee structure and training schedules.