我厂生产的压力容器,直径大于1600毫米的椭圆封头,均采用分瓣压制,然后焊接成形。过去是采用手工焊接,劳动强度大,生产率低,不能满足生产需要。1974年以来,采用了粗丝 CO_2 气体保护半自动焊工艺,提高效率2～3倍,改善了劳动条件,深受焊工欢迎。封头材质为 A_3、20G、16Mn、16MnR、15MnV 等,板厚16～40毫米。封头焊缝有纵缝和环缝(图1),焊纵缝是将封头放在转胎上,边转边焊,使焊缝处于水平位置。 I plant the pressure vessel, the diameter of more than 1600 mm oval head, are used to suppress the valve, and then welding forming. The past is the use of manual welding, labor-intensive, low productivity, can not meet the production needs. Since 1974, the use of coarse wire CO_2 gas protection semi-automatic welding process to improve efficiency of 2 to 3 times to improve the working conditions, welcomed by the welders. Head material for the A_3,20G, 16Mn, 16MnR, 15MnV, etc., thickness 16 ~ 40 mm. Seam weld longitudinal seam and ring seam (Figure 1), weld seam is the head on the tire, turn edge welding, the weld in a horizontal position.