一、前言 CO_2电弧焊接,由于其具有生产效率高、经济性好和可以得到良好的焊接质量等优点而被广泛地用于焊接构件之中。这种焊接,尽管有半自动和全自动之分,但是都是在一定的保护气氛中使电流集中在直径很小的焊丝上,所以焊接电流和电弧电压经常要进行上下变化。与手工电弧焊等方法相比,电弧容易出现不稳定现象,而且产生较多的飞溅。这种飞溅粘附在焊嘴上,不仅降低了保护气体的效果,而且使焊缝外观变差。由于部分飞溅粘附在工件上, I. INTRODUCTION CO_2 arc welding is widely used in welding components due to its advantages of high production efficiency, good economy and good welding quality. This type of welding, although semi-automatic and fully automatic, always focuses the current on a very small diameter wire under a protective atmosphere, so the welding current and arc voltage often change up and down. Compared with manual arc welding and other methods, the arc prone to instability, and produce more splashing. This spatter adheres to the tip, which not only reduces the protective gas but also deteriorates the weld appearance. As part of the splash adhesion to the workpiece,