Features of Eddy Current Testing

1, The metal tube, rod, wire rod detection, contact is not required and no need for a coupling medium. So high detection speed, easy to implement automated testing, especially for online P seized.
2, High sensitivity for the detection of surface defects, and in a certain range with good linearity indication of the size of the different defects can be evaluated, it can be used as a quality management and control.
3, Eddy currents are many factors, such as cracks, material, size, shape and electrical conductivity and permeability and the like. Spleen using specific circuits for processing, can filter out certain factors inhibit other factors, thereby making it possible for an individual above factors for effective testing.
4, Since the inspection and do not have contact with the workpiece without coupling medium, it can be detected at high temperatures. As the probe can be inserted into the distant job, so the workpiece can be narrow and deep wall area (including walls) and other testing.
5, The use of electrical display, it is possible to store and reproduce the data comparison and processing.
6, Eddy current testing of the object must be a conductive material, and due to electromagnetic induction, and applies only to the metal surface defect detection, NA detect internal defects of metallic materials deep.
7, The penetration depth of the metal surface induced eddy currents varies with frequency, high excitation frequency eddy current density at the surface of the metal, with the decrease of the excitation frequency eddy current penetration depth is increased, but the surface eddy current density is reduced, the depth and surface flaw detection hurt sensitivity is conflicting, difficult to strike. When a material eddy current flaw detection, the need for comprehensive consideration according to the material, surface condition, testing standards, and then determine the NDT programs and technical parameters.
8. When using encircling coil eddy current testing, coil cover is a tube, rod or wire on the circumference of a length, to obtain information on the factors that influence the entire circle cumulative result, the specific location of the defect in which the circumference It can not be determined.
9, rotating probe type eddy current testing method can accurately stuck defect location, sensitivity and resolution are high, but the detection area is small, in the test material when the need for comprehensive scanning, inspection slower.
10, Or in equivalent eddy current testing has been comparing the detected phase defects make accurate qualitative and quantitative judgment yet to be developed.