核级管道异种钢焊接缺陷的性质、成因及解决对策  

Identification and Cause Analysis of Welding Defects in Dissimilar Steel Joints of Nuclear Pipeline and the Countermeasures

作　　者：吾之英[1] 胡建群[2] 李强[1] 樊少岩 

机构地区：[1]上海发电设备成套设计研究院,上海200240 [2]中核集团秦山第三核电有限公司,海盐314300 [3]上海宝冶建设有限公司,上海200941

出　　处：《动力工程》2010年第1期79-82,共4页Power Engineering

摘　　要：对核电站核级管道异种钢焊缝出现的缺陷进行分析,采用模拟焊接试验的方法进行了裂纹再现,进而通过微观分析揭示了裂纹的性质和形成原因.结果表明:异种钢焊缝中出现的缺陷是热裂纹;焊缝中的硫元素含量过高是形成焊接缺陷的主要原因;在异种钢焊接时控制熔合比和热输入,可有效防止此类缺陷的产生.Welding defects existing in dissimilar steel joints of nuclear pipeline were reproduced and studied with a series of simulated welds,during which the defects were identified while the causes analyzed.Results show that the wleding defects are of the hot crack type,of which the formation can be attributed to too high sulfur content in the weld joints.Further studies prove that this kind of defects can be effectively prevented by proper adjustment of fusion ratio and heat input during welding performance.

关 键 词：核电站 核级管道 异种钢 焊缝 热裂纹 影响因素 

分 类 号：TL353.11[核科学技术—核技术及应用]