磁场对双丝间接电弧形态的影响

对双丝间接电弧在自身磁场及外加磁场变化的情况下,电弧形态随磁感应强度值的变化规律进行了研究.自身磁场变化通过改变两焊丝夹角角度实现,外加磁场由励磁线圈产生,对间接电弧施加横向及纵向磁场,磁场强度利用特斯拉计测出,并借助高速摄像系统对磁场变化时的电弧形态进行拍摄.研究表明,通过改变两焊丝夹角及施加横向磁场的方式,可使两焊丝所夹区域内外磁场强度之差变大,使得电磁力的外扩作用增大,电弧变细长;施加纵向磁场时,电弧在与两焊丝垂直的平面内发生偏转,其偏转程度随纵向磁场强度增加而增加.

Effect of magnetic field on twin-wire indirect arc shape

The effect of internal magnetic field and external magnetic field on twin-wire indirect arc shape was studied in this paper.The variation of internal magnetic field was obtained by changing the angle of wires.The external magnetic field was applied by excitation coil.The magnetic induction intensity was measured by Tesla meter,and the indirect arc shapes were captured by high-speed camera system.The experimental results showed that the magnetic intensity difference between the internal and external region of arc increased by decreasing of the included angle and increasing of applied transverse external magnetic intensity.As a result,which increased the extrapolation effect of electromagnetic force and the arc became long and concentrated.Applied longitudinal external magnetic field would deflect the indirect arc in the vertical plane of the twin wires,and the deflection degree increased with increasing of applied longitudinal external magnetic intensity.