中文摘要：

针对双旁路耦合电弧熔化极惰性气体保护（Metal inert gas,MIG）焊过程,使用高速摄像采集不同旁路电流下的熔滴过渡图像,通过图像处理提取熔滴过渡数据信息,并对熔滴所受的主要作用力进行定量计算。根据计算结果对比分析不同参数下熔滴受力的动态变化情况,研究旁路电弧对熔滴过渡的促进机理。结果表明,在焊接总电流较大的情况下电磁力对双旁路耦合电弧MIG焊熔滴过渡的影响最显著,旁路电弧可以促进熔滴上弧根面积的扩展和熔滴缩颈的形成,通过增加向下的电磁力来促进熔滴过渡,且旁路电流越大旁路电弧对熔滴过渡的促进作用越明显;在焊接总电流不变的情况下,随着旁路电流的增加熔滴过渡频率随之增加,熔滴尺寸随之减小,熔滴过渡形式逐渐由大滴过渡转变为喷射过渡。

英文摘要：

Aiming at the dual bypass metal inert gas（MIG） welding process,pictures of the process of metal transfer under different bypass currents using the high speed camera is taken and the data of metal transfer by the image processing is obtained.The main forces affected the drop is calculated by the data.In addition,the situation of force under different welding parameters which act on the drop and researched the mechanism of metal transfer promoted are compared.The results indicated that electromagnetic force has the most important influence to the process of metal transfer of the dual bypass MIG welding.By the promoting of expand the area of arc root,the bypass arcs promote the metal transfer of the dual bypass MIG welding and this influence will be increased by bypass current.Moreover,with the increase of bypass current,the frequency of the metal transfer could be increased and the size of the drop is decreased when the total current is constant.The type of metal transfer is changed to spray transfer from globular transfer.