CAP1400核电站接管和安全端焊接变形与残余应力研究  

Investigation on Welding Deformation and Residual Stress for Nozzle Safe-End Welded Joints of CAP1400 Nuclear Power Plant

作　　者：谷雨[1] 张俊宝[1] 余燕[1] 

机构地区：[1]上海核工程研究设计院,上海200233

出　　处：《压力容器》2016年第6期8-11,32,共5页Pressure Vessel Technology

基　　金：国家重大专项资助项目(2010ZX06002)

摘　　要：系统研究了CAP1400核电站接管和安全端模拟件焊接变形与残余应力分布特点。接管和安全端在焊接过程中焊接变形主要集中于焊接的初始阶段,焊接1/4厚度时,变形量为3 mm左右,焊接完成后,焊缝收缩量高达4.5 mm。盲孔法测试结果表明,在整个接管和安全端焊接接头内,环向与轴向焊接残余应力均为拉应力。焊接残余应力的最大值位于安全端镍基堆焊层与对接焊缝熔合线附近,测试结果达到500 MPa。Welding deformation and residual stress was studied for the mockup of the nozzle safe-end weht joint of CAP1400 nuclear power plant. It is showed that welding deformation occurs mainly in the welding initial stage. When the thickness of the deposited metal was a quarter of the joint,the amount of deformation was about 3 mm, while 4.5 mm when the nozzle safe-end joint welding was completed. Both the circumferential and axial welding residual stress are tensile stress through the whole welding joint. Max weld- ing residual stress is located in the heat affected zone. It is showed the max residual stress is mainly oc- curred near the fusion line between butt welds and buttering, as high as 500 MPa.

关 键 词：CAP1400核电站 接管和安全端 焊接变形 残余应力 

分 类 号：TH49[机械工程—机械制造及自动化] TG404[金属学及工艺—焊接]