Eddy current test

Eddy current testing refers to a non-destructive testing method that uses the principle of electromagnetic induction to non-destructively evaluate certain properties of conductive materials and their workpieces or discover defects by measuring changes in induced eddy currents in the inspected workpiece. In industrial production, eddy current testing is one of the main means to control the quality of various metal materials and a few non-metallic conductive materials such as graphite and carbon fiber composite materials and their products. It occupies an important position in the field of non-destructive testing technology.

Eddy current testing is to bring a conductor close to a coil with alternating current, and the coil establishes an alternating magnetic field. The alternating magnetic field passes through the conductor and generates electromagnetic induction with it, creating eddy currents in the conductor. The eddy currents in the conductor will also produce their own magnetic field. The effect of the eddy current magnetic field changes the strength of the original magnetic field, which in turn leads to changes in the coil voltage and impedance. When defects appear on the surface or near the surface of a conductor, the intensity and distribution of eddy currents will be affected. The changes in eddy currents will in turn cause changes in the voltage and impedance of the detection coil. Based on this change, the existence of defects in the conductor can be indirectly known. Eddy current testing methods include: pulse eddy current testing, multi-frequency eddy current testing

●Domestic standards: NB/T 47013, GB/T 18851, GB/T 26953, GB/T 9443, JB/T 9218, etc.
●International/EU standards: ISO 3452, ISO 4987, EN 10228-2, EN 1371, ISO 23277, etc.
●American standards: ASTM E1417, ASTM E165, ASTM E433, ASTM A903, etc.

Zhongke Testing is the pioneer and leader in third-party non-destructive testing and verification services in China. It provides comprehensive non-destructive testing system solutions for steel structure engineering (buildings, power plants, etc.), boilers, pressure vessels, pipelines, bridges, wind power, thermal power engineering ships and offshore facilities, motor vehicles, hoisting machinery, iron towers, amusement facilities and many other industries. It has successfully tested various parts, structural parts and equipment, and has effectively promoted the harmonious and rapid development of customers and industries. All influencing factors related to electromagnetic induction can be used as detection objects of eddy current detection method.