An excitation coil carrying current is placed in proximity to the component to be inspected. An alternating current is passed through a coil in order to create an alternating magnetic field which is used to induce a localised current (eddy current) into the material . According to Lenz's law, a conducting loop when subjected to varying magnetic field gets an emf induced into it causing flow of current in a direction opposing the change causing it. Eddy Current testing is a means of checking the condition of tubes in the condenser and evaporator sections of a chiller. This type of testing relies on a coiled piece of conductive wire on a probe. Eddy current testing, or ECT, is commonly used in manufacturing and service industries that use sheet metal, tubing, and other thin metal products for critical operations. A specially designed coil energised with an alternating-current is placed in proximity to the test surface, generating a changing magnetic field that interacts with the test-part and . A rotating current is gone through a loop with a specific end goal to make a substituting attractive field which is utilized to actuate a limited . Eddy Current Testing (ECT) is a valuable tool for preventative maintenance in any chiller. The information fed back from the probe reveals abnormal tube wear or tube defects. Probes sense the change and find out the distance between the probe and the test material. Eddy testing devices range from complex high-performance systems to budget-friendly basic systems. This coil is energized with an alternating current to generate a magnetic field. Eddy current testing is a popular NDT-Non destructive testing purpose with a simple technique. Also referred to as 'Inductive testing'. Eddy current testing is also used in the nuclear industry to check reactor internals before installation and after maintenance operations and check welds, pipes, valves, etc., before they are installed into a reactor . An eddy current, will generate on the surface of the test material in counter-clockwise to the . Eddy currents (also called Foucault currents) are electric currents induced within conductors by a changing magnetic field in the conductor. In its most basic form the single-element eddy current testing probe a copper wire is excited with an alternating electrical current. Eddy current testing is used to measure properties as magnetic permeability, electrical conductivity, condition after heat treatment, dimensions, grain size, and hardness. Crack detection, material thickness measurements, coating thickness measurements, conductivity . Eddy Current Testing Advantages. Essentially, the technique uses a coil (ECT probe) carrying an alternating current as transducer. Regular eddy current inspection helps to minimize downtime and allows component replacement/repair to be done on a non-emergent schedule. That is why eddy current testing is categorized as surface technique, which principally can be used for all electrically conductive materials. They can be induced within nearby . Eddy Current testing is the use of electromagnetic induction to detect and characterize surface and sub-surface flaws in conductive materials. Eddy current testing of tubes is an effective way of assessing the condition and lifespan of tubes, particularly in the power generation, petrochemical, chemical, fertilizer . The term eddy current comes from analogous currents seen in water in fluid dynamics, causing localized areas . Such testing can detect corrosion or any other damage that causes metal thinning. This type of testing will identify problems which cause tube leaks that result in major repair costs and extended downtime. Eddy Current Principle. Weakened points and potential failures, if left untreated, could cause bigger . What is Eddy Current. It is caused when a conductor is expos. Eddy current test information can be displayed in many different ways. This produces an alternating magnetic field parallel to the axis of the coil which in turn . Since the nature of the eddy currents is affected by numerous properties of the test object there are diverse fields of application for eddy current testing (e.g. Eddy current testing uses the principle of electromagnetic induction to detect flaws in conductive materials. Eddy current testing is one of most common electromegnetic testing NDT methods. various flaws like corrosion, cracks, pitting and so on, can be easily detectable through this technique. Eddy current testing is a non-destructive testing method widely used to examine tubing in heat exchangers, steam generators, condensers, air coolers and feedwater heaters. Eddy current testing by inductive sensors is an important NDE technique, especially for layered structures. Eddy currents are swirls of electric currents induced within conductors by a changing magnetic field within the conductor (self-inductance). Eddy current is usually the best technique when inspecting tubing materials, thinner welds, and surface flaws, whereas ultrasonic technology is a good choice when assessing corrosion, wall sizing and thicker forms of welding that may harbor deviations on a volumetric level. Score: 4.1/5 (28 votes) . Eddy currents (also called Foucault's currents) are loops of electrical current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction or by the relative motion of a conductor in a magnetic field. Eddy Current Level I training is a basic course in eddy current theory, test instrumentation, coils and basic impedance plane principles. Eddy current testing is a non-destructive material examination technique frequently used to detect near-surface defects of conductive materials. Eddy-current testing (also commonly seen as eddy current testing and ECT) is one of many electromagnetic testing methods used in nondestructive testing (NDT) making use of electromagnetic induction to detect and characterize surface and sub-surface flaws in conductive materials. Identify differences in their structure and composition. Eddy Current testing is a type of NDT (nondestructive testing) which will evaluate the condition of specific materials without harming them. This test is commonly used to detect surface or sub-surface flaws in conducting materials. Eddy current testing is fairly used in various industries as well as testing of various tubes like condenser tubes, which is discussed in this article. Eddy current testing uses an electromagnetic field that is set up by passing an alternating current through a coil of wire. Eddy current array (ECA) is a nondestructive testing technology that provides the ability to electronically drive multiple eddy current coils, which are placed side by side in the same probe assembly. The advantages of eddy current testing are: Sensitivity to surface defects. Eddy current testing, or ECT, is used primarily in the detection of surface and sub-surface flaws such as cracks in conductive materials . For a plane wave excitation with frequency f of a medium with conductivity s and permeability , d . The Eddy Current Principle works as the Self-inductance. Surface probes coils typically mounted close to one end of a plastic housing. Each individual eddy current coil in the probe produces a signal relative to the phase and amplitude of the structure below it. A rotating current is gone through a loop with a specific end goal to make a substituting attractive field which is utilized to actuate a limited current (whirlpool current) into the material under test. With ECT, a test probe with an alternating current produces a magnetic field. In short, eddy current testing uses electromagnetic fields to identify cracks, metal thickness and hardness, heat damage, conductivity, and other characteristics of metal . Eddy current testing is a non-destructive testing (NDT) inspection method used for a variety of purposes, including for flaw detection, material and coating thickness measurements, material identification and establishing the heat treatment condition of certain materials. Electromagnetic damping is a force that is generated when the eddy current is in close contact with a magnetic object or a conductor. Eddy Current Non Destructive Testing (also called ECT) is an NDT method that works on the electromagnetism principle as shown in the below figure 1. Eddy currents are fields of alternating magnetic current that are created when an alternating electric current is passed through one or more coils in a probe assembly. Maintaining equipment properly and regularly helps to . Contents. Eddy current testing can be used on all electrically conducting materials with a reasonably smooth surface. Eddy current testing is just one of the methods used by technicians to find defects . The probe's electromagnetic coils emit eddy currents. The alternating magnetic field creates eddy currents - or eddies - in conductive . Specially designed surface probes are bei ng used for this inspection. A technician inserts a probe into the tube and pushes it slowly through the entire length of the tube. Eddy-current Testing. The size and geometry of the part dictate how testing is to be accomplished, as they influence eddy-current probe design and in what manner the probe and part . More complex testing usually requires more channels and more test positions. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. Another application is in the nuclear and petrochemical industry for inspection of heat exchanger tubing. Conveniently, the eddy current testing procedure, which involves passing a long part through a round, hollow coil, is ideal for detecting these types of defects. What ECT struggles with is radial cracks, which are highly transient appearing and disappearing quickly. The cross . Pulsed Eddy Current (PEC) is an electromagnetic inspection technique used to detect wall loss on ferromagnetic structures such as carbon steel and cast iron. Eddy current testing is extremely important in making this determination and also helping to provide an overall assessment of component and system health. It is also used to measure coating thickness. It can be done quickly with minimal downtime. electromagnetic induction. It provides a relative volumetric measurement converted into an averaged thickness measurement based on the calibration area. Discontinuities . Eddy current testing is a non-contact electromagnetic testing technique used for the inspection of conductive materials without the need to remove non-conductive coatings. This is especially useful for metal tubing. Eddy current testing is a non-destructive testing (NDT) inspection method used for a variety of purposes, including for flaw detection, material and coating thickness measurements, material identification and establishing the heat treatment condition of certain materials. During the ECT, an alternating current (AC) is passed through a coil placed in the . In Service plant and equipment such as cranes, monorails, and hoists along with Excavators and Booms, for example, are coated or painted with protective coating for corrosion resistance . The case goes similar to when instead of a conducting closed loop, the change in magnetic field through a conducting body, say a filament or a slab of magnetic material or non-magnetic . Description of Eddy Current Testing. Details. Able to detect defects of 0.5mm in length under favourable conditions. History. Eddy current testing is one of several non-destructive testing methods that uses the electromagnetism principle for flaw detection in conductive materials. Eddy current sensors sense displacement and are formed when a changing magnetic field intersects a conductor. Eddy current testing is used in the medical equipment industry for checking the quality of surgical instruments and implants. Can detect through surface coatings. Eddy current testing is a non-destructive test method that can be performed on conductive materials. Besides being used to detect defects or flaws, ECT can also measure metal thickness. Eddy Current Testing Swirl current testing is a non-contact electromagnetic testing system utilized for the assessment of conductive materials without the need to evacuate non-conductive coatings. As steel f of a medium with conductivity s and permeability, d field develops in and around the. 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