CO_2气体保护焊是一种比较先进的焊接方法,已经广泛地应用于机车车辆制造与修理中。尽管如此,人们对于这种工艺方法的某些规律尚缺乏全面、系统的认识。例如:熔滴过渡的方式对熔深的影响,在立焊中焊接方向与焊接质量的关系,角焊缝的焊脚尺寸与其他弧焊方法相比在一定熔滴过渡范围内应取的等效值,以及焊 CO_2 gas shielded welding is a relatively advanced welding method and has been widely used in the manufacture and repair of rolling stock. In spite of this, there is a lack of a comprehensive and systematic understanding of certain laws governing this process. For example, the effect of droplet transfer on weld penetration, the relationship between weld orientation and weld quality in vertical welding, and the weld leg size of fillet weld should be equivalent to that of other arc welding methods in the range of droplet transfer Value, and welding