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JY-A of electromagnetic yoke weld flaw detector is equipped with d-type probe, electromagnetic yoke to the magnetic flaw detector artifacts of AC magnetization of magnetic particle flaw detector which magnetization testing of the various components, including the local magnetization testing of large parts, can be used as external magnetic testing by magnetic particle test and remanence method. Instruments composed by SCR switch, low noise, long service life. Instruments and small volume, light weight, improve strength and adjustable joints, especially for flat welds, fillet welds, pressure vessels, piping and testing of complex shape parts. Instrument outputs for low voltage, high voltages are not allowed into the equipment testing occasion more appropriate.