高速旋转电弧窄间隙MAG焊焊缝成形的分析

采用平特性电源，研究了高速旋转电弧窄间隙MAG焊接工艺对焊缝成形的影响规律。结果表明，旋转电弧是通过热量的合理分配来改善焊缝成形，旋转频率对熔化速度的影响很小。提高旋转频率和降低保护气中CO2的含量有利于增加侧壁熔深，改善焊缝成形；但同时也容易造成电弧与侧壁短路，恶化焊缝成形，严重的将出现未熔合。所以在间隙小于10min时旋转频率应小于50Hz。焊接速度的变化不会影响过渡形式，但较低的焊接速度可以得到更大的表面下凹。

Influence of welding parameters on bead formation in high-spinarc narrow gap MAG

Infuence of welding parameters on weld bead formation in high-spin-arc narrow gap MAG is investigated by utility of flat characteristic power.Experiment results show that spin arc can improve bead formation by distributing arc heat properly, while influence of spin frequency on melting rate is limited.Increasing spin frequency and reducing CO₂ content in the shielding gas can improve sidewall penetrationg and bead formation, but it may also lead to short circuit of the arc with sidewall and deterioration of bead formation, even lack of fusion.The spin frequency should be below 50 Hz when gap is less than 10 mm.Droplet transter manner will not be affected by welding speed, but a lower welding speed can get a bigger surface concavity.