不同直流弧焊电源输出电缆周围低频磁场的研究

Investigation on the low-frequency magnetic field around the output cables from the different D.C.arc welding power source

焊接过程低频磁场主要分布在焊接电源和焊接电缆周围,一般焊接电缆周围的磁场强度比焊接电源周围强,对作业人员的辐射影响更大。在此分析了两类典型直流焊接电源的输出电缆周围磁场的产生机理,通过试验分析了电缆周围磁场的特性。研究发现,焊接电缆周围的磁场频率决定于焊接电源的电路拓扑,不同焊接电源在电缆周围的磁场差异较大;在输出电流值相同时,不同焊机的输出电缆周围磁场对人体影响程度不同。

The low-frequency magnetic field generated by the process of welding is mainly distributed around the power source and the cables.Generally speaking, the magnetic field strength around the cables is stronger, so the effect of radiation to workers is more severe.In this paper,the mechanisms and properties of magnetic field around the output cables from two typical D.C. welding power sources are analyzed by experiment.It is found that the frequency of magnetic field around cables is determined by the topologies of welding power source.Moreover,there exists an obvious difference among the magnetic fields around the cables generated by different welding power source.The effect to human body is also varying when the value of current is equal.