采用熔化极气体保护电弧焊的先进管道焊接技术

Advanced pipe welding with gas- shielded metal arc welding

在要求很高的石油化工行业管道焊接应用场合,熔化极气体保护电弧焊（GMAW）广泛应用于金属焊接.在这些场合中,除了在一种材料两面进行的焊接外,其他场合均采用留隙焊根焊接.通过采用先进的电源技术,可以在没有铜衬垫的情况下进行外部焊接.介绍了一种提高管道环焊质量和效率的新焊接工艺,简称“Wise Root＋”.焊接试验结果表明,这种新焊接工艺对改善电弧稳定性、控制飞溅、熔透成形和焊接速度均具有积极作用,获得了光滑、均匀的根部焊道以及完全焊透和侧面熔合效果.焊接速度是钨极惰性气体保护焊（GTAW）的3～4倍.

Gasshielded metal arc welding （（;MAW） is the most widely used are welding process for joining of metals in demanding pipe welding applications in the petrochemical industry. For such applications, open root welding is used in situations that preclude welding from both sides of the material. External welding without copper backing has become possible through the introduction of advanced power source technology. The paper describes a novel process called WiseRoot ＋ designed for further improving the quality and productivity of pipe girth wehting. Welding test results clearly show the beneficial effect of the new process on arc stability, spatter for- marion, weld penetration formation, and welding speed. Smooth, consistent root passes with complete penetration and sidewall fusion were obtained. The wehling speeds employed were three to four times higher than those used in gas tungsten arc welding （GTAW）.