双丝间接电弧焊的电弧形态

Electric arc shape of twin-wire indirect arc welding

用高速摄像系统及示波器对双丝间接电弧气体保护焊的电弧形态进行了研究。结果表明,双丝间接电弧气体保护焊在两丝端部形成电弧,其电弧本质仍然是气体放电的一种表现形式。焊接电流、电弧电压及两焊丝交点与工件间距离对电弧形态产生较大的影响,随焊接电流的变化,电弧形态会发生不同程度的集中与分散的变化;电压越大电弧越明亮电弧的形体也越大;两丝交点与工件间距离越小,电弧越集中并且变得短而亮。燃烧过程中电弧电压随时间而周期性变化,相应的电弧形态也随着时间发生周期性变化,电弧电压与电弧形态间有很好的对应关系。

With high speed camcorder system and digital oscillogragh,the electic arc shape of twin-wire indirect arc welding was investigated.Results show that the arc was burning between the two wires in twin-wire indirect arc welding,and the arc was still a type of gas discharge in nature.Welding current,arc voltage and the distance between the two wires and the workpiece have great influence on the arc shape.With the welding current changing,the arc shape presents different degree of concentration and scatter.The arc becomes brighter and bigger with the increase of arc volgage.When the distance between the two wires and the workpiece reduced,the arc concentrated and became shorter and brighter.Arc voltage changes periodically,and its corresponding electric arc shape changes also periodically,and it has well corresponding relationship between arc voltage and electric arc shape.