Eddy Current of Eddy Current Testing Machine Must Be Tested from Multiple Directions

Eddy Current of Eddy Current Testing Machine Must Be Tested from Multiple Directions

Eddy current testing machine is an instrument and equipment developed based on the principle of eddy current detection. It is used to detect the quality of conductive materials, whether there are defects and various information about defects. The intelligent flaw detector can evaluate the performance and remaining life of the test piece according to the information of the defect, so as to reduce the occurrence of harm.


Ⅰ. The operation and function of eddy current testing machine


In practical applications, when testing the conductor under test, the probe of the eddy current testing machine moves at a certain speed and the position information of the defect can be obtained according to the waveform of the eddy current change. It is worth noting that the crack perpendicular to the flow direction of the eddy current blocks its flow, so that the reflected magnetic field on the workpiece changes accordingly, which in turn leads to changes in the impedance and voltage of the detection coil to be detected. If the direction of the crack is parallel to the direction of the eddy current, the defect is difficult to find. Therefore, in general eddy current testing, testing must be performed from multiple directions.


The application of the eddy current testing machine: detection of surface cracks in different parts; steel separation-distinguishing installation mixtures of different materials; weld crack defect detection; defect detection of heat exchanger tubes and condenser tubes using internal probes; find pores and cracks in multilayer structures with the help of a rotating scanner; identify near-surface defects in non-magnetic conductive materials; measure electrical conductivity; measure coating thickness.


Ⅱ. Factors affecting the use effect of eddy current testing machine


The remarkable feature of the eddy current testing machine is that it can work on conductive materials, not necessarily on ferromagnetic materials. The effect on ferromagnetic materials is poor. Secondly, the surface finish, flatness, and boundary of the workpiece to be tested have a great influence on eddy current flaw detection. Therefore, eddy current inspection is often used for the inspection of non-ferromagnetic workpieces such as copper pipes with regular shapes and smooth surfaces.


The flaw detector is an instrument that uses the principle of an eddy current to detect defects on the metal surface. Eddy current flaw detection uses an AC electromagnetic coil to induce eddy currents on the surface of metal components.


It is suitable for defect detection of conductive materials, including ferromagnetic and non-ferromagnetic metal components. Due to the eddy current flaw detection, the coil and the component are not required to be in close contact during the detection and there is no need to fill the coupling agent between the coil and the component, which is easy to realize the automation of the inspection. Eddy current testing machines are widely used in the field of bars and pipes due to their excellent performance.


Ⅲ. Wide applications of eddy current testing machine


Eddy current testing machine is one of eddy current NDT equipment. Because of its compactness, simplicity, and detection accuracy, it is widely welcomed by various industries. It is often used in aviation, railway, industrial and mining enterprises in the field or on-site.


It can be widely used in online and offline flaw detection of various non-ferrous metals, ferrous metal pipes, rods, wires, wires, and profiles. It has high detection sensitivity for the defects of metal pipes, rods, wires, wires, and profiles, such as surface cracks, dark seams, slag inclusions, and open cracks.

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