中文摘要：

通过大量的工艺实验,找出了DE-GMAW双焊枪组合的匹配参数,测试了焊接电流波形,拍摄了熔滴过渡图像,并获得了无成型缺陷的焊缝照片.基于实验结果解释了高速焊接工艺的机理.建立了适用于DE-GMAW焊接工艺的有限元模型,并对该工艺条件下的温度场、应力-应变场进行了数值模拟.结果表明：计算出的DE-GMAW焊缝横断面形状尺寸与实验结果吻合良好;在通过焊丝的总电流相同时,DE-GMAW焊接时焊缝尺寸、热影响区宽度、应力、应变及变形均小于常规GMAW焊时的结果.这为DE-GMAW焊接工艺参数优化提供了基础数据.

英文摘要：

Through large amount of experiments, the geometrically matched parameters in torchset up of DE-GMAW （double electrode-gas metal arc welding） were found, and the welding current waveforms, images of metal transfer, and photographs of weld without defects were obtained. Based on these test results, the reasons that DE-GMAW can realize high-speed welding were explained. A finite-element analysis model suitable to DE-GMAW process is developed to simulate the temperature field and stress-strain field. The predicted and measured weld dimensions at cross section matched well, and the weld dimension, heat-affected zone width, stress, strain and deformation in DE-GMAW are much lower than those in conventional GMAW under same welding condition. It provides the basic data for optimizing the process parameters in DE-GMAW.