Study on the process mechanism of highspeed 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.