交流热丝GMAW工艺是一种高效焊接工艺，其主弧为传统GMAW电弧. 填充焊丝和熔池及母材构成闭合回路，交流脉冲预热电流流经该回路，产生电阻热并预热填充焊丝. 当被预热到高温的填充焊丝进入熔池后，在液态金属作用下迅速熔化. 进行了高效热丝GMAW工艺的试验研究，找到填充焊丝预热电流、填充焊丝伸出长度、焊丝间距、主弧焊接规范等参数之间的匹配规律，实现了20 kg/h以上的熔敷速率. 分析了前述影响因子对熔敷效率的影响规律. 结果表明，热丝GMAW在提高熔敷速率和熔敷系数方面相对传统焊接工艺有明显优势，可以实现高熔敷率低热输入的工艺效果. 该工艺在高强钢大厚板焊接等领域具有广阔的应用前景.
Alternating current and hot wire GMAW process is a kind of efficient welding process, the main arc of which is the traditional GMAW arc. Under the action of AC pulse preheating current, the filler wire can flow form a closed loop with the welding pool structure in the base metal. The current flows through the loop to generate resistance heat to preheat the filler wire. The filled wire preheated to high temperature will melt rapidly under the thermal influence of the liquid metal after entering the molten pool. In this experiment, the high efficiency hot wire GMAW process was studied. The study found the matching rules among the parameters such as the preheating current of the filler wire, the extension length of the filler wire, the distance between the filler wire, the main arc welding specification, etc. Finally, it was realized the deposition rate above 20 kg/h. Through the analysis of the influence rules of the above factors on the deposition efficiency, the results show that: compared with the traditional welding process, hot wire GMAW has obvious advantages in improving the deposition rate and deposition coefficient. This process has a broad application prospect in the field of high strength steel thick plate welding.
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