Magnetic-memory test (MMT) instrument of leaking magnetic field bases on leaking magnetic test consists of the source filter formed with RC network and calculating enlarger, magnetic sensitive sensor, probe, signal handles electric circuit, display and key-control device, CPU etc. The MMT is used in testing the distribution of surface stress of tired component, welding line, equipment and work-piece. Taking test of abutment welding line of reheating pipes for a power plant, at first, tested object was n...
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