ASNT Level 3 Eddy Current Testing Course
ASNT Level 3 Eddy Current Testing Course Fees 450 $ | ASNT Level 3 Eddy Current Testing Course Exam Fees To be informed | ASNT Level 3 Eddy Current Testing Course Duration 20 Days | ASNT Level 3 Eddy Current Testing Course Location Muscat
Selection of Electromagnetic Testing
Electromagnetic tests are an important and widely used method within the broad field of nondestructive materials testing.
The electromagnetic test method includes several subsidiary methods, sometimes called submethods or techniques: eddy current testing, remote field testing, flux leakage testing, alternating current field measurement testing and microwave testing. Of these several submethods, conventional eddy current testing is the most widely used. Magnetic particle testing is an electromagnetic test that industry administers as a separate method.
Advantages of Electromagnetic Testing
Modern eddy current and electromagnetic test techniques offer low cost means for high speed, large scale testing of metallic materials such as those used in nuclear, aerospace, marine, high pressure, high temperature and high speed engineering systems where premature failures could represent economic disasters or the endangering of human life.
ASNT Level 3 Eddy Current Testing Course covers the method’s special suitability for testing of automobiles, engines, machine parts and consumer products has long been recognized.
Like other nondestructive methods, eddy current tests permit measurements of material properties and dimensions and detection of discontinuities. In general, electromagnetic tests provide nearly instantaneous measurements. The test speed and modern signal analysis permit such analysis to be performed in real time.
Consequently, the method can be used in production lines to test swiftly moving bars, tubes, sheets, plates, welds and other symmetric parts. These parts either pass through test coils or are scanned by moving test probes.
The automation of eddy current testing and test data evaluation permits mass testing of similar parts at high rates, with economies not attainable by other commonly used nondestructive tests. The results can be optimized for automation of test systems, for sorting of test parts, for control of manufacturing processes and for automatic documentation for process control and statistical quality control.
Limitations of Eddy Current Tests
Limitations of eddy current tests are a direct consequence of the specific nature of the test and of the response of electrically conductive test materials to the externally applied, time varying magnetic fields used to excite eddy current flow. In general, eddy current tests are applicable only to test materials with
significant electrical conductivity, such as metals and alloys and composites with conducting layers or reinforcing fibers.
They can be used, however, to measure thicknesses of nonconducting layers on the surface of conducting metallic materials by the liftoff effect in which the coating separates the test probe from the conducting material by the thickness of the nonconductive coating or sheet material. Eddy current tests provide maximum test sensitivity for the surface and near surface layers of the test material adjacent to the source of excitation.
In some cases it may be difficult or impossible to penetrate to the center of thick specimens because of skin effect and attenuation of the electromagnetic field at certain depths below the surface. Eddy current tests tend to be insensitive to laminar discontinuities, which lie parallel to the induced eddy currents. They do tend to respond, however, to discontinuities that lie transverse to the flow of eddy currents within test materials, where these discontinuities interrupt, lengthen or distort the current flow paths.
Test Procedures for Electromagnetic Testing
The conduct of facility operations (in-house or contracted) should be performed in accordance with specific instructions from an expert. This is typically accomplished using written instructions in the form of a technical procedure. In many cases, codes and specifications will require a technical procedure to perform required tests.
ASNT Level 3 Eddy Current Testing Course covers the procedure process can take many forms, including general instructions that address only major aspects of test techniques. Or a procedure may be written as a step-by-step process requiring a supervisor’s initial or signature after each step.
Contact Us
ASNT Link