CO_2保护焊十多年来已经发展成为一种重要的熔化焊接方法。在一些主要的工业国家中它已占有了足以与埋弧焊和手工焊相抗衡的地位。我国自从1959年以来也有了较大的发展。细丝(φ0.8～1.6毫米)半自动焊在有些单位已成功地用于生产,并已取得丰富的经验。无产阶级文化大革命以来,在毛主席的革命路线指引下,进一步试验研究了粗丝CO_2保护焊。如用φ2.5毫米的焊丝焊接了 Over the last decade, CO 2 shielded welding has developed into an important fusion welding method. In some major industrialized countries, it has occupied enough to compete with submerged arc welding and hand welding. Since 1959, our country has also made great progress. Semi-automatic welding of filaments (φ0.8 ~ 1.6mm) has been successfully used in some units and has gained a wealth of experience. Since the Great Proletarian Cultural Revolution, under the guidance of Chairman Mao’s revolutionary line, further research has been conducted on the thick wire CO 2 shielded welding. As with φ2.5 mm welding wire