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CO_2 气体保护焊具有成本低、效率高、焊接质量好等优点,近年来在国内外受到很大重视,应用日趋广泛。但就目前应用情况来看,85%以上为细丝。然而,细丝电弧功率小,还远远满足不了厚板高效率高质量焊接的要求。随着工业生产的发展,大厚板的焊接问题迫切需要解决。国内外对此甚为关注,开展了诸如多丝自动电弧焊、窄间隙气电焊以及粗丝(φ3～5毫米)CO_2 气体保护焊(以下简称“粗丝焊”)等新工艺的研究。对大厚度的普低钢焊接来说,采用“粗丝焊”是
CO_2 gas shielded welding has the advantages of low cost, high efficiency, good welding quality, etc., which have received great attention at home and abroad in recent years and are widely used. However, the current application of view, more than 85% of filaments. However, the filament arc power is small, but also far can not meet the requirements of high efficiency and high quality welding thick plate. With the development of industrial production, the welding problem of big thick plate needs to be solved urgently. At home and abroad are very concerned about this, carried out such as multi-wire automatic arc welding, narrow gap gas welding and thick wire (φ3 ~ 5 mm) CO_2 gas shielded welding (hereinafter referred to as “thick wire welding”) and other new technology research. For the large thickness of the ordinary steel welding, the use of “thick wire welding” is