采用单电源双丝旁路耦合电弧高效GMAW方法的“碳钢-不锈钢”堆焊接头微观组织测试与分析

Study on Overlay Welding of Dissimilar Steel by Consumable Double Electrode Gas Metal Arc Welding Method with One Power Supply

双丝旁路耦合电弧高效GMAW采用特定的接法,通过旁路电弧的分流作用可以实现高效、低热输入、低稀释率的焊接过程。采用该方法在Q235碳钢表面堆焊了耐磨、耐蚀的316L不锈钢材料,同时检测分析了不同焊接参数下的异种钢堆焊接头微观组织形貌,分析了旁路电流的变化对接头界面区碳元素迁移与焊缝合金元素稀释的影响。结果表明:随着旁路电流的增加,对接头焊接质量影响较大的界面处碳迁移层厚度明显减小,焊缝中合金元素稀释的过渡区域宽度也显著降低。

Consumable double electrode gas metal arc welding with one power supply is a novel and high effective welding process, which has low heat input and low dilution rate characteristics. In order to study how to improve the quality of dissimilar steel welded joints, the overlay welding experiments of Q235 low carbon steel and 316L stainless steel were carried out by using Consumable DE-GMAW overlay welding method. In addition, influences of different welding parameters on heat input and dilution rate of base metal were analyzed and the microstructure of dissimilar steel welded joints was also studied. The results show that the heat input and dilution rate of base metal is reduced when the bypass current is increased, and the diffuse-on behavior of carbon and the dilution rate of base metal are also reduced.