Cr5Mo与20钢焊接残余应力有限元分析  

Finite Element Analysis of Residual Stress for Cr5Mo and 20 Steel Welded Joint

作　　者：何天平[1] 程凌[1] 陈正南 

机构地区：[1]江苏省安全生产科学研究院,江苏南京210042

出　　处：《石油化工设备》2008年第6期45-49,共5页Petro-Chemical Equipment

摘　　要：应用大型有限元分析软件ABAQUS对Cr5Mo与20钢焊接接头的残余应力进行有限元分析,获得了异种钢焊接接头残余应力的分布规律,并与同种钢焊接接头残余应力进行了比较。结果表明,异种钢焊接接头的残余应力明显大于同种钢焊接接头的焊接残余应力。在异种钢焊接接头中,由于母材热膨胀系数和焊缝熔合金属组织的差异,热膨胀系数大的材料侧焊接残余应力大,最大环向应力出现在内壁焊缝根部,最大轴向应力出现在外壁焊缝处。研究结果为焊接工艺优化和提高异种钢接头的可靠性提供了理论基础。By using finite element analysis code ABAQUS,the welding residual stress of CrSMo and 20 steel joint was analyzed. The distribution of dissimilar steel welding was obtained. The comparison of welding residual stress between the same and dissimilar steel was carried out. The results indicated that the welding residual stress of same steel was lower than that of dissimilar steel welding joint obviously. Because of the difference of parental material thermal expansion coefficient and welding microstructure,the higher residual stress was produced by the bigger thermal expansion coefficient of parental material. The highest hoop residual stress was in welding line root of internal wall, and the highest axial residual stress was in welding line surface of outer wall. The research results provided theory basis for optimizing the welding procedure and improving the reliability of dissimilar steel welding joint.

关 键 词：异种钢 焊接 残余应力 有限元方法 分析 

分 类 号：TE963.03[石油与天然气工程—石油机械设备]