材料期刊网

根据当前制造业对高效、优质、低耗焊接技术的迫切要求，研发出低成本的高速电弧焊接新工艺DE-GMAW。该工艺在常规GMAW焊接设备的基础上，通过附加GTAW焊枪构成旁路电弧，分流了一部分通过焊丝的焊接电流，在施加于焊丝的电流较大的情况下（保证了熔敷率），减小了作用于母材的热输入，解决了高速焊接面临的矛盾，实现了高速电弧焊接。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和应力变形进行了数值模拟。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。

With considering the urgent requirement of high efficiency, high quality, and low consumables welding technologies, a novel high-speed arc welding process of low cost, i.e., DE-GMAW (double electrode-gas metal arc welding), is developed. It attaches a GTAW torch on conventional GMAW equipment to makes part of current flowing through the wire pass the bypass arc between the GTAW torch and the main arc. Thus, under the condition of larger current flowing through the wire to ensure high deposition rate, the heat input exerted on the base metal is decreased to avoid the contradictory which high-speed welding faces with, and high-speed arc welding is realized. A Finite-element analysis model suitable to DE-GMAW process is developed to conduct numerical simulation of temperature and stress-strain fields. The results show that the predicted and measured weld dimensions at cross section match 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 conditions. It provides the basic data for optimize the process parameters in DE-GMAW.