粗丝CO_2气体保护焊在螺旋焊管预焊中的应用

Application in Helical Submerged-arc Welded (SAWH) Pipe Tack-welding of Thick Wire CO_2 Gas Shielded Welding

介绍了螺旋埋弧焊管预精焊机组中的预焊设备与工艺,分析了进口DC 1500数字化焊接电源的优点。针对目前国内比较成熟的螺旋焊管预焊工艺大都采用Ar+CO2二元保护气体或者Ar+CO2+O2三元保护气体的情况,重点介绍了采用CO2气体保护的预焊工艺的优缺点,对电弧形态和焊接工艺参数进行了分析,提出了CO2气体保护预焊飞溅物和焊缝成形的控制措施。论述了预焊电弧形态和熔滴过渡特点,以及相关工艺参数对焊接过程的影响。

In this paper, it inlrnduced tile tack-welding process and equipment of SAWH pipe units,and analyzed the advantages of the imported DC 1500 digital welding power. At present, the Ar＋ CO2 t）inary shielded gas or Ar＋ CO2＋O2 ternaRy shielded gas was mostly adopted in SAWH pipe tack-welding process in China domestic, it emphasized on the advantages and disadvantages of CO2 gas shielded welding, analyzed the arc shape and the welding process parameters, and put forward control measures to splash and weht formalion of CO2 gas shielded welding tack-welding. In the end, it discussed The arc shape and The characterislics of droplet transfer, and the influence of related process parameters To welding procedure.