The structure of metal can be inspected using eddy current testing, and the structure test of metal can be carried out at a high speed by establishing an automated system for applications such as poor heat treatment, poor shape test due to mixing of dissimilar materials and missing processing (molding) processes.
Eddyworks’s MFECT(Multi-Frequency Eddy Current Test) Technology allows you to inspect from the surface level to a certain depth level of materials. With the different penetration depths of multi-frequency, it optimizes the structural eddy current test for the various and challenging cases.
It can be used for the heat treatment quality test and detect the material properties after heat treatment such as hardness, case depth, case depth pattern and also structure, tensile strength and etc.
The principle of test is that when the magnetic field generated by the eddy current sensor (coil) is transmitted to the metal close to it, an induced current is generated, which is called an eddy current.
Depending on the physical properties (chemical components) and the degree of structural change of the metal, the size and shape of the eddy current generated in the metal is detected differently, and the equipment detects it and can perform an automated mass production test.
Most metals such as steel, aluminum, SUS, tungsten, copper and alloys can be tested with ECT.
Depending on the material and test frequency, the eddy current penetrating depths are differ as shown in the picture below. The higher frequency has the higher sensitivity to the surface, and the lower frequency can penetrates deeper through the surface to a certain depth.
For this technical reason, Multi Frequency Eddycurrent Testing (MFT/MFETs) can test more different types of defects and challenging ones.
EddyWorks’ equipment can be designed to mix up channels in one equipment with crack detection channels, structure test channels, tap detection channels and their any combinations. And it can simplify the system and lower investment costs.