一、前言 CO_2气体保护焊是五十年代发展起来的一项先进焊接技术。十几年来,这项技术在我国有较大的发展,已为越来越多的地区和单位在生产中加以推广使用,并创造了不少可贵的经验。实践证明,CO_2气体保护焊较之其他电弧焊有更大的优越性——如适应性强、效率高、质量好、成本低、变形小、操作简单、易于实现机械化和自动化等。 I. Introduction CO_2 gas shielded welding is developed in the fifties advanced welding technology. In more than a decade, this technology has been greatly developed in our country. It has been promoted and used by more and more regions and units in production and has created a lot of valuable experiences. Practice has proved that CO_2 gas shielded welding has more advantages than other arc welding - such as adaptability, high efficiency, good quality, low cost, small deformation, simple operation, easy mechanization and automation.