采用数值模拟和残余应力实测方法,研究水冷法改善1Cr18Ni9Ti奥氏体不锈钢管和20钢圆管的多层对焊残余应力分布的有效性。结果表明水冷法可有效调整圆管的焊接残余应力分布,使圆管内表面的焊接缝附近区域获得双向压缩残余应力。应力腐蚀敏感性实验结果表明,水冷法可显著提高焊接圆管的抗应力腐蚀性能。
Thermo-elastic-plastic finite element method was employed to investigate the welding stress distribution in the multipass-girth-butt welded pipes of austenitic stainless steel (1Cr18Ni9Ti) and mild steel(0.2%C). The computed results showed that significant biaxial tensile residual stresses existed in the weld vicinity region of the inner surface of the pipes under the normal process condition. Water cooling could effectively adjust the residual stress distribution and obtain the biaxial compression residual stresses on the whole HAZ of the pipe inner surface. The residual stress measurements verified the conclusion. The compression residual stresses of the multipass-girth-butt welded 1Cr18Ni9Ti pipe could remarkably improve its resistance to stress corrosion cracking.
参考文献
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