通用線圈退磁：Universalcoildemagnetization：工件在磁粉探傷時將工件磁化；當工件的長軸與地磁方向一致并受到沖擊或振動載荷時被地磁場磁化；工件磨削、電弧焊接、低頻加熱及強磁體接觸被磁化等
通用線圈退磁：
Universal coil demagnetization：
工件在磁粉探傷時將工件磁化；當工件的長軸與地磁方向一致并受到沖擊或振動載荷時被地磁場磁化；工件磨削、電弧焊接、低頻加熱及強磁體接觸被磁化等。只有在個別情況下工件上的剩磁有用處，但在絕大多數情況下，其上的剩磁都是有害的，故進行退磁，退磁就是將工件內的剩磁減小到不妨礙使用的程度。
Magnetizing the workpiece during magnetic particle inspection; When the long axis of the workpiece coincides with the geomagnetic direction and is subjected to impact or vibration load, the workpiece is magnetized by the geomagnetic field; Workpiece grinding, arc welding, low frequency heating and magnetizing of strong magnet contact etc. The remanence on the workpiece is useful only in a few cases, but in most cases, the remanence on the workpiece is harmful, so demagnetization is to reduce the remanence in the workpiece to a level that does not hinder the use.
技術參數（Technical parameter）
移動行程：1200mm;
Movement stroke: 1200mm;
輸入電壓：380V 50Hz；
Input voltage: 380V 50Hz
輸入電流：200A；
Input current: 200A
線圈截面：150-1100mm
Coil section: 150-1100mm
整機絕緣電阻大于2兆歐；
The insulation resistance of the whole machine is greater than 2 megohms.
退磁效果：工件退磁后剩磁不大于0.2mT；
Demagnetization effect: the remanence of the workpiece after demagnetization is not more than 0.2mT
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