双电极钛钙型碳钢焊条焊芯间距对焊接工艺及电弧形态的影响

采用平板堆焊的方法及高速摄像系统,研究了双电极钛钙型碳钢焊条的焊芯间距对焊接工艺和电弧形态的影响。结果表明,双电极钛钙型碳钢焊条的焊芯间距是影响电弧电压的最重要因素。在焊接过程中,调节双电极焊条与工件间距对电弧电压的影响很小;随着焊芯间距的增大,电弧电压升高,焊条套筒形状由两边尖、中间凹逐渐变为两边凹、中间凸的形状,焊接电弧由小而集中变为大而分散。对于药皮质量系数为45.6%、直径为4mm的双电极钛钙型碳钢焊条(双焊芯),在电流为200A的条件下,当焊芯间距为1.2～1.7mm时焊缝成形较好。

Effect of span between two cores of lime-titania type carbon-steel electrode on welding technology and shape of arc

The effect of span between two cores of lime-titania type carbon-steel electrode was investigated using the method of overlay welding on the plate work-piece and high speed camera system. The results show that the span between two cores of twin electrode is the important factor for affecting arc voltage. Adjustment of the space between twin electrode and work-piece has a little influence on arc voltage. Increasing the span of two cores makes arc voltage get up. The shape of mantle scope of welding rod changes from both side pointed and midst concave to both side concave and midst convex, and the welding arc changes from small and centralized type into large and decentralized shape. For the twin electrode with a coating weight coefficient of 45.6 per cent and a diameter of 4 mm, good weld appearance can be gained, when the welding current is 200 A and the span of two cores ranges from 1.2 mm to 1.7 mm.