在恶劣的天气下,在露天安装场地进行CO_2焊接是很困难的,因为在焊接坡口表面会生锈,在电弧中会吸入潮湿的空气和水分。为了得到致密的焊缝,在这种情况下要求对被焊工件严格清理,坡口要精确准备,保护气体流要避风。但这样做是非常麻烦的,有时甚至是无法做到的。正因为在露天场地或野外作业大量的焊接工作时金属易生锈和吸收水分,考虑创造在 In harsh weather, CO_2 welding is difficult in open-air installations because of the rust on the weld bevel surface and the damp air and moisture in the arc. In order to obtain a dense weld, in this case requires rigorous cleaning of the workpiece to be welded, bevel accurately prepared to protect the gas flow to avoid the wind. But doing so is cumbersome and sometimes impossible. Precisely because metal is rusty and absorbs moisture during extensive welding work in open fields or in the field,