No permanent record (unless automated). The probe was made to fit precisely over the Christmas-tree-shaped joint where each turbine blade meets the hub. Zetec is a global leader in nondestructive testing (NDT) solutions for the critical inspection needs of industries the world counts on every day. It was a reminder that kids who grew up with the Xbox and touch screens are undaunted by technology and the pace at which it’s developing. The variable speed magnetic rotor (shown in red in Figure 1) is mounted concentrically within the drum. The material to be heated is placed inside the coil. Eddy current drives can be expected to remain in reliable service for several decades, matching the service life of the motor and the pump for which they are used. They didn’t have to scan every channel—software would choose the optimal view for them, regardless of orientation. However, coil configurations, instruments, and software continue to improve, and today there are countless probe designs with coils configured for specific applications from bobbin probes for heat exchanger tubing to handheld probes for rivets, bolt holes, and welds. (v) Sensitivity for small displacement is high. 1. advantages: - can be leveraged in a macroscopic study of the Einstein de Haas effect (perform this experiment using four coils on a toroid and energize them in quadrature) and place/hang a ferromagnetic ring over it. The entire scan would typically take less than three minutes, with a higher probability of detection. Thus, it can be applicable in monitoring or sensing the precise location of an object such as a machine tool. Portability. Among these advantages are energy reduction, reduced wear on mechanical components, improved process control, controlled acceleration and deceleration, and avoidance of water hammer or hydraulic surges. ECT is one of the most versatile forms of NDT testing in terms of portability and flaw detection. Looking for cutting-edge ECT probing options?

Power loss due to eddy currents is eddy current loss and appears in the form of heat. (i) Position measurement Since the output of an eddy current transducer represents the size of the distance between transducer and conductor, the device can be calibrated to measure the position or displacement of the target. Heat exchanger probes come in bobbin and array form, as well as probes with mixed bobbin/array features. Foucault in the year 1895 observed that when a mass of metal moves in a magnetic field or when the magnetic field through a stationary mass of metal is altered, induced current is produced in the metal.

Required fields are marked *. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos.

Additionally, he has interested in Product Design, Animation, and Project design. The second example takes me back to that water intake pipe at Seabrook. Contact us today for more information about our innovative nondestructive testing solutions. As a result, the inspection changed from a manual process that lasts several minutes per joint to a more automated one that takes seconds—a significant improvement considering that a turbine has dozens of blades. You also have the option to opt-out of these cookies. This will allow analysts to further streamline inspection processes, conduct more thorough and accurate tests, and detect flaws early enough to successfully prevent them from developing into critical failures that can cost precious time, money, and—in the worst cases—lives. This probe is used to inspect tubing at nuclear steam generators, where speed and detection accuracy are critical for reducing costs as well as radiation dose. Gary Patterson is the pump, fan and compressor technical specialist for Dynamatic, focusing on pumping and similar applications in the industrial and municipal markets.

The material to be heated is placed inside the coil.

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While the cost of materials is low, the technician has to work through a time-consuming multi-step inspection process including surface preparation and disposal of chemicals and other waste. (2) There is little wastage of heat as heat is produced in the body to be heated up directly. It is sensed by a reference coil to create an output signal. Zetec’s designers are industry-leading experts in ultrasonic and eddy current technologies, and we can help you navigate any of our NDT testing solutions or devices. Large area scanning can be accomplished, but needs the aid of some type of area scanning device, usually supported by a computer, both of which are not inexpensive. Using array coils on a traditional probe design like this bobbin probe for heat exchangers improves the speed and probability of finding circumferential cracks and other flaws. By closing this message or continuing to use our site, you agree to the use of cookies. It has some of the strongest signal qualities that detect more flaws during the testing phase, including minor material losses. At the site, it took nearly four hours to properly prepare and dry the weld area, apply liquid penetrant, let it dwell, and perform the inspection, plus another hour or so to clean up. Testing Outdoor Medium Voltage Motor Drives, Offline Motor Testing Finds Insulation Weaknesses Earlier, 5 Changes Impacting Variable Speed Fire Pump Motors, Understanding and Adopting IIoT Condition Monitoring, Leveraging IoT for Condition-Based Maintenance, Seal-Free Pump Designs Minimize Leaks and Pump Failure, In-depth articles on pump industry issues, Expert insights into important topics in the field. FAQ: What are the advantages and disadvantages of eddy current testing. Initially, development of multi-coil arrays was driven by specific applications. Terms of Service 7.

This surface array probe is designed to cover a two-inch wide inspection area in a single pass, including on non-flat surfaces. However, in spite of these disadvantages, there are also situations in which ECT has a clear advantage over other NDT options. By visiting this website, certain cookies have already been set, which you may delete and block.

Advantages of Eddy Current Heating 3. (3) Temperature control is easy i.e.

Will not detect defects parallel to surface. The current swirls through the material in loops, like eddies in a river.

ECT particularly shines in the area of heat exchanger inspections, where eddy current instruments can detect irregularities within tubing materials such as carbon steel and magnetic alloys. Disclaimer 8. Since a contact device is impracticable for this application, a non-contact device such as eddy current transducer is highly recommended.

(vi) It is insensitive to material in the gap between transducer and conductor.

When the distance changes between target and probe, the impedance of the coil will correspondingly change. National Structural Integrity Research Centre, Granta Park, Great Abington, Cambridge, CB21 6AL, UK. They didn’t have to be as focused on scanning technique—the multiplexed coils would provide ample coverage in a fraction of the time. (i) The result will be precise only if the gap between transducer and conductor is small. The raised crown of the weld and the irregular surface of most welds would require multiple passes with a UT probe to encompass the crown, the surface, and the heat-affected zone on both sides. The machine operates... LearnMech.Com is a Mechanical Project-oriented platform run by Sachin Thorat who is a B-Tech Graduate in Mechanical Engineering.

Compared to ultrasonic testing (UT), for instance, eddy current instruments are capable of subsurface inspections but cannot probe as deeply as UT instruments. It was new construction at the time but seeping inside, and about a third of the inspection involved overhead work. With an array probe users can capture more information in a single pass, and dramatically increase the speed, accuracy, and repeatability of nondestructive tests, especially on large inspection areas. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Meaning of Eddy Current Heating 2. Introduction to Slotting Machine : One element that can be controlled is test frequency: raising the frequency will increase the test’s sensitivity to surface or subsurface flaws; lowering the frequency will increase the depth of penetration into the material. If a planar defect does not cross or interfere with the current then the defect will not be detected.

Visit our updated, This website requires certain cookies to work and uses other cookies to help you have the best experience. Moreover, ECT is not always equipped to handle large areas, especially those with complicated geometries. Advantages of Eddy Current Heating 3. Oil under pressure is moving in every hydraulic circuit. The target material must be at least three times thicker than the effective depth of the eddy currents to make the transducer successful because the transducer assumes that the eddy currents are localized near the surface of a semi-infinite solid and the actual eddy current amplitude decreases quadratically with distance.

Since the output of an eddy current transducer represents the size of the distance between transducer and conductor, the device can be calibrated to measure the position or displacement of the target. Disadvantages. All Sponsored Content is supplied by the advertising company. Advantages of Eddy Current sensors over Capacitive or Laser Displacement sensors. Content Filtration 6. Thus, it can be applicable in monitoring or sensing the precise location of an object such as a machine tool. Eddy Current Testing Eddy current testing is a nondestructive technique that’s capable of detecting both surface and sub-surface defects.

Able to detect defects of 0.5mm in length under favourable conditions. (vi) It is insensitive to material in the gap between transducer and conductor. So for minimising the such current cores are laminated and slotted. Electrical Engineering, Heating, Eddy Current Heating. In such situations, a more thorough inspection technique (such as phased array ultrasonic testing, or PAUT) is needed to pinpoint flaws at various angles and wave beam shapes. Prohibited Content 3.

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