双丝串列电弧焊焊缝成形的试验分析

将旋转电弧传感器和双丝串列电弧焊结合起来，开发了旋转电弧引导的、两个电弧在同一个熔池上燃烧的双丝串列电弧焊方法，对其焊缝成形工艺进行了研究.分析了焊接电流、焊接电压、双丝间距、电弧旋转等参数对焊缝成形的影响.结果表明，随着焊接电流的增大，熔敷速度增加，焊缝成形系数呈现先增大后减少的变化规律.而焊接电压的增大则会使焊缝成形系数略有减小.对双丝间距的研究发现，当间距为15 mm时，焊接质量较好.与普通双丝串列焊相比，前置电弧旋转时熔池底部变得平坦，最大熔深有所减小，平均熔深有所增加，这将有助于减少焊缝的应力集中.与单丝旋转电弧焊相比，焊接熔敷速度显著增大，有效避免了高速焊接时的咬边现象.

Experimental analysis of weld formation in tandem twin-wire co-pool welding process

A new rotating arc leading tandem twin-wire co-pool welding method was developed in this paper. The developed method has the seam tracking capability of rotating arc weld. The influence of weld parameters such as welding current, arc voltage, two wire distance and arc rotating on welding formation quality were studied. The results show that with the increase of welding current, the deposition rates increases linearly, while the aspect ratio of weld increases firstly and then decreases in the later. With the increase of arc voltage, the aspect ratio of weld decreases slightly. Based on the study of the distance between two wires, it is found that the weld seam quality is better when the distance is 15mm. Compared with the traditional tandem twin-wire welding, in the rotating arc leading tandem twin-wire welding process, the molten pool bottom becomes flat, and the maximum weld depth decreases, but the average weld depth increases, which is helpful for decreasing the stress concentration on the weld seam. Compared with the single wire rotating arc welding, the deposition rate increases apparently, and the welding undercut phenomenon can be avoided during rotating arc leading tandem twin-wire welding process.