焊剂带约束电弧特性的试验分析

通过向电弧两侧连续送入焊剂带以约束电弧的方法,对焊剂带约束电弧的特性进行了研究.结果表明,焊剂带靠弧柱区的热量被加热熔化,在稳定的焊接条件下,形成一个确定的焊剂带与电弧作用长度,其大小随电弧电压的减小,送带速度的增加而增大,这一参数直接影响着焊剂带约束电弧的形态,增加它可使电弧长度增长而宽度减小,进而可使焊缝的熔深增加而熔宽减小;焊剂带与电弧中心距离的减小可明显减小电弧的宽度,使焊缝熔宽减小而熔深增加;利用焊剂带约束电弧的特性可以实现超窄间隙焊接.

Constricting arc characteristic with flux strips

Because constricted arc has many merits, such as high energy density and high velocity of plasma, it is applied in many welding fields.The characteristics of constricting arc with flux strips was studied by sending two pieces of flux strips into arc along both sides of the arc.The results show that flux strips are melted by heating of arc column under a stable welding condition, and certain action length of flux strips that act on the arc are formed on both sides of the arc, and the length will increase with the decrease of voltage and the increase of velocity of feeding flux strips.Action length can directly influence on the morphology of constricting arc with flux strips, and with action length increase, arc width will shorten and arc length will elongate, as a result the welds become deep and narrow;when the distance from the center of the arc to the flux strip is reduced, arc width will distinctly become narrow, and weld depth will become deep and weld width will become narrow; ultra-narrow gap welding can be achieved by use of the characteristics of constricting arc with flux strips.