DE-GMAW高速电弧焊工艺机理的研究

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.

STUDY ON THE PROCESS MECHANISOM OF HIGH-SPEED ARC WELDING DE-GMAW

Through large amount of experiments,the geometrically matched parameters in torch- set 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.