乏燃料水池S32101双相不锈钢覆面水下激光焊接维修系统与焊接工艺研究  

Research on Underwater Laser Welding System and Welding Process of S32101 Duplex Stainless Steel Cladding in Spent Fuel Pool

作　　者：张晓春[1] 沈光耀[1] 梅乐[1] 朱加雷[2] 李丛伟 Zhang Xiaochun;Shen Guangyao;Mei Le;Zhu Jialei;Li Congwei(Shanghai Nuclear Engineering Research&Design Institute Co.,Ltd.,Shanghai,200233,China;School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing,102617,China)

机构地区：[1]上海核工程研究设计院股份有限公司,上海200233 [2]北京石油化工学院机械工程学院,北京102617

出　　处：《核动力工程》2024年第5期225-231,共7页Nuclear Power Engineering

基　　金：国家科技重大专项(2018ZX06002006);国家电力投资集团有限公司B类科研课题(KY-B1-2020-HN-10)。

摘　　要：为了实现核电站乏燃料水池覆面缺陷水下高质量修复,基于水下局部干法激光焊接技术,研制了集移动定位系统、水下激光焊接-视觉-送丝一体化设备以及移动气罩的水下激光焊接维修系统,并利用该系统对三代核电乏燃料水池覆面(S32101双相不锈钢)进行了水下焊接工艺优化试验研究。结果表明:①均流管结合坡口同步吹扫的排水工艺可有效降低水分子对于焊缝成形的影响;②氮气作为双相不锈钢水下焊接的保护气体,可以提升熔覆层和热影响区的奥氏体含量;③较高的激光功率可以减少焊接缺陷的产生,提高水下局部干法激光焊接的稳定性。焊接试件的无损检测结果和理化性能满足乏燃料水池建造焊接标准要求,证明了该水下激光焊接维修系统与焊接工艺的可行性及可靠性。In order to achieve high-quality underwater repair of spent fuel pool cladding defects in nuclear power plants,an underwater laser welding system with mobile positioning system,underwater laser-vision-wire feeding integrated equipment and mobile gas hood was developed based on underwater local dry laser welding technology.The underwater laser welding system was used to optimize the underwater welding process of the third generation nuclear spent fuel pool steel cladding(S32101 duplex stainless steel).The results show that the influence of water molecules on weld formation can be effectively reduced by using the drainage technology of equalizing flow pipe and simultaneous purging of groove.Using nitrogen as the protective gas for underwater welding of duplex stainless steel can increase the austenite content in the cladding layer and heat affected zone.The welding defects can be reduced by use of higher laser power,thus improving the stability of underwater local dry laser welding.The results of non-destructive testing and physical and chemical properties of welded specimens meet the requirements of welding standards for spent fuel pool construction,which proves the feasibility and reliability of the underwater laser welding system and welding process.

关 键 词：水下局部干法焊接 水下激光焊接维修系统 双相不锈钢 焊接工艺 

分 类 号：TM623[电气工程—电力系统及自动化] TG456[金属学及工艺—焊接] TL387[核科学技术—核技术及应用]