高强度焊丝和管线焊接金属的吸氢能力

Hydrogen Absorption Capability of High Strength Weld Wire and Weld Metal for Line Pipe

研究了压力为1 000 MPa的管道上使用的高强度焊丝和焊接金属的吸氢能力,通过将氢气阱应用于高强度焊接金属来防止管道高强度焊接金属出现冷裂纹。回火温度600℃为的焊丝在阴极充电后立即进行氢化反应,在45℃保持72 h后达到最大值。特别的,回火温度600℃为的焊丝在45℃保持72 h后,溶液浓度为2ppm。通过透射电子显微镜(TEM)观察和电子分散光谱(EDS)分析,通过钼和碳化铬识别了氢阱位置,因为焊丝在600℃的回火温度下,硬度最大。确认了管道高强度焊接金属中氢气阱是由于氢化反应产生的。

The hydrogen absorption capability of high-strength weld wire and weld metal with 1000 MPa for line pipes was investigated in order to prevent the cold-cracking of high-strength weld metal for line pipes by applying hydrogen traps to high-strength weld metal. Hydrogen concentration immediately after cathodic-charging and that after holding for 72 hours at 45℃ indicated the maximum value at the tempering temperature of weld wire at 600℃. Especially,the hydrogen concentration after holding for 72 hours at 45℃ indicated 2 ppm at the tempering temperature of the weld wire at 600℃. A hydrogen trap site was identified with molybdenum and chromium carbide from Transmission Electron Microscope( TEM) observation and Electron Dispersive Spectroscopy( EDS) analysis because the maximum hardness indicated the maximum value at the tempering temperature of the weld wire at 600℃. The hydrogen concentration due to hydrogen traps was confirmed in the high-strength weld metal for line pipes.