针对工程实际,采用直径为1.2mm的焊丝,进行了工艺性能和力学性能等多次试验,找出了一种适合于钢结构箱形梁的CO2气体保护双丝双弧自动、高效焊接方法。这种焊接方法提高了焊接生产效率、避免了焊接缺陷、降低了工人的劳动强度,从而达到降本增效的目的。 According to engineering practice, the welding wire with diameter of 1.2mm was used to carry out several experiments, such as technological performance and mechanical properties, to find out a kind of automatic and efficient welding method of CO2 double gas double wire arc protection for steel box beam. This welding method to improve the welding production efficiency, to avoid welding defects, reducing the labor intensity of workers, so as to achieve the purpose of reducing costs and increasing efficiency.