双电极焊条熔滴过渡的特点及形式

用激光背光高速摄像系统研究了双电极焊条的熔滴过渡，阐述了双电极焊条熔滴过渡的特点，基于试验结果，总结了双电极焊条熔滴过渡的各种形式。双电极焊条单弧焊，工件不接电源，熔滴的过渡方向与电流方向不同，电弧对药皮的加热易于使焊芯两边药皮产生滞熔，形成两边尖中间凹的套筒形状，从而有利于熔滴以渣壁过渡形式过渡。钛钙型双电极碳钢焊条和不锈钢焊条具有渣壁过渡、喷射过渡和爆炸过渡等多种过渡形式，以细熔滴渣壁过渡为主，而石墨型堆焊焊条主要以粗熔滴渣壁过渡为主。

Characteristics and Mode of Metal Transfer on Twin Electrode Single Arc Welding

The metal transfer of twin electrode single arc welding was investigated with a digital high-speed video analyzer and an arc shadow-graphing system based on a laser source and related optical system. Based on test results, the characteristics and mode of metal transfer of twin electrode single arc welding has been analyzed and summarized. In the twin electrode single arc welding, work-piece does not receive power source, the drop transitional direction and current direction are not the same. Because of the particularity of electric arc heating coating, it is easy to produce the sleeve shape of both sides pointed and midst concave and help to transform with flux wall guided transfer. Lime titania type carbon steel and stainless steel twin electrode transform with the mode of flux wall guided transfer, explosive transfer and spray transfer et al, but transform mainly with thin globular flux wall guided transfer. Graphite type surfacing twin electrode transforms mainly with coarse drop flux wall guided transfer.