堆焊修复焊缝对异种钢焊接接头残余应力的影响规律研究  

Study on the influence of residual stress of dissimilar steel welded joints by cladding repair

作　　者：林继德 鲁立[2] 张斌 杨志鹏 吴义党 LIN Jide;LU Li;ZHANG Bin;YANG Zhipeng;WU Yidang(China Nuclear Power Engineering Co.,Ltd.,Shenzhen 518124,China;Suzhou Thermal Research Institute Co.,Ltd.,Suzhou 215004,China)

机构地区：[1]中广核工程有限公司,广东深圳518124 [2]苏州热工研究院有限公司,江苏苏州215004

出　　处：《电焊机》2019年第11期92-95,共4页Electric Welding Machine

摘　　要：核电站核岛主设备安全端在服役过程中内壁常产生应力腐蚀裂纹,目前减轻或修复该缺陷的方法是在管道外壁堆焊不锈钢、镍基合金等高韧性、耐腐蚀的合金材料以提高存在缺陷管道的强度,同时在管道内壁产生压缩残余应力。建立了预测常规焊接管道修复和堆焊修复后残余应力分布的轴对称有限元模型,对比分析焊后两者的残余应力分布情况。在此基础上计算得到不同堆焊层厚度对管道壁厚范围内残余应力的影响规律。结果表明:对于堆焊修复工艺,当堆焊宽度固定时,堆焊层厚度由4层增加至7层,层数的增加对残余应力曲线形态的影响不大,但随着堆焊层的增加,压应力峰值不断增大。Stress corrosion cracks often occur on the inner wall of the main equipment of nuclear island in nuclear power plant during its service.At present,the technology to alleviate or repair this defect is to surfacing stainless steel,nickel-based alloy and other high toughness,corrosion-resistant alloy materials on the outer wall of the pipeline to improve the strength of the pipeline with defects,while producing compression residual stress on the inner wall of the pipeline.In this paper,an axisymmetric finite element model is established to predict the residual stress distribution after conventional welded pipe repairing and surfacing repair,and the residual stress distribution between them is compared and analyzed.On this basis,the influence of different thickness of surfacing layer on residual stress in the range of pipe wall thickness is calculated.The results show that when the width of surfacing is fixed,the thickness of surfacing layer increases from 4 to 7 layers,and the number of layers has little effect on the curve shape,but with the increase of surfacing layer,the peak value of compressive stress increases continuously.

关 键 词：残余应力 堆焊修复 管道修复 

分 类 号：TG404[金属学及工艺—焊接]