Swing sensor of scanning type electric arc is to apply a the widest kind to solder at present electric arc sensor, sensor of this kind of electric arc needs a pendulous device, the transverse direction in welding line swings back and forth and implementation welding line dogs. Use in arc welding machine implement on the person swing electric arc sensor does not need pendulous device, drive welding torch to make through robot arm transverse swing can. But the effect that suffers robot structure element, of the robot swing frequency is commonly under 10Hz, if pursue,1a place is shown. Solder to fall with the case with welding line big radian in high speed, its dog the effect can be affected.

MKODAMA invented high speed of a kind of electromagnetism to swing electric arc sensor, the two side of sensor of this kind of electric arc have permanent magnet and incentive coil respectively, when the direct current that carries certain frequency when incentive coil flows, electric lever meets those who produce certain frequency to swing, realize welding line thereby dog.