Eddy current testing (also commonly seen as eddy current testing and ECT) is a nondestructive testing technology making use of electromagnetic induction to detect and characterize surface and sub-surface flaws in conductive materials. Eddy current defect testing is a dynamic test and is accomplished by running energized coils over an area to be tested. Eddy currents are fields of alternating magnetic current that are created when an alternating electric current is passed through one or more coils in a probe assembly. When the probe is linked with the part under inspection, the alternating magnetic field induces eddy currents in the test part. As the coils pass over a crack or flaw, discontinuities or property variations in the test part change the flow of the eddy current the eddy currents are forced to deviate, and this deviation is detected by the eddy current instrument. Testing is fast, accurate, and repeatable, and the technology is much better suited for in-line and offline production inspection versus magnetic particle and dye penetrant testing.
As top 3 eddy current testing equipment manufacturers in China, DSS's portable eddy current testing instrument which detects cracks and other surface defects in magnetic and non-magnetic metals. It is compact, lightweight, and simple to set up and operate. It provides an excellent signal and noise ratio on virtually all metals. A portable eddy current flaw detector provides on-device workflow applications efficiently guiding the inspector while capturing electromagnetic inspection data. Real-time collaboration with remote experts allows fast and accurate indication confirmation. No more stacks of paperwork or questionable inspection calls, just easy and efficient nondestructive testing for weld, aerospace (including rotary), and general-purpose inspections.
DSS's vertical eddy current inspection equipment has a sturdy aluminum housing, a crisp and clear daylight viewable screen, menu systems, and user-friendly interface. Our eddy current tester for sale presently appeals to users within a broad range of industries including offshore, rope access non-destructive testing (NDT) applications, and other weld inspection applications replacing magnetic particle and liquid penetrant inspection, particularly on coated welds. DSS is the top 3 eddy current testing equipment manufacturers in China, providing high-quality portable eddy current flaw detector and vertical automatic or combined ultrasonic flaw detector with eddy current inspection equipment.
The drawings below represent schematically how does eddy current machine works. The coil (red) causes a magnetic field, which initiates eddy current. If a defect appears in the effective area, the eddy current has to take a different way, this changes the impedance of the coil and the operator sees the changes on his screen (Z1-Z2).
Non-destructive--means that when the test results are obtained, except for rejecting non-conforming products, no parts are lost. Therefore, the scale of inspection is not limited by the number of parts. It can be used for sampling inspection and general inspection when necessary. Therefore, it has more flexibility (both general inspection and random inspection) and reliability.
Mutual compatibility-refers to the mutual compatibility of inspection methods, that is, the same part can use different inspection methods simultaneously or sequentially, and the same inspection can be repeated. This is also a non-destructive benefit.
Dynamic-this means that the eddy current testing method can inspect the parts in use, and can timely investigate the cumulative impact of the product during operation. Thus, the failure mechanism of the structure can be ascertained.
Strictness-refers to the strictness of eddy current testing technology. First, eddy current testing requires special instruments and equipment to help ET machines with testing smoothly and accurately. second, it needs the inspector to adjust a suitable parameter to test by using sample piece.