窄间隙热丝TIG焊在反应堆压力容器上的应用及质量控制研究

概述窄间隙热丝TIG焊在CPR1000压力容器进、出口接管与接管安全端焊缝上的具体应用。针对CPR1000反应堆压力容器进、出口接管与接管安全端焊缝射线检测不合格问题,从变位器装配精度控制、焊接操作、气体保护控制等方面找出不合格的主要原因,并通过制定多项整改措施并逐项落实,大幅提升了反应堆压力容器进、出口接管与安全端焊缝焊接质量和焊后射线检测一次合格率,为国内核岛主设备窄间隙TIG焊接技术的实际应用提供了经验。

Application and quality control of narrow gap hot wire TIG welding technology for reactor pressure vessel

The application of narrow gap hot wire TIG welding for welds in CPR1000 reactor pressure vessel import and export nozzle and the nozzle safe-end is summarized. Aiming at the unqualified problem of radiographic inspection of welds,the main causes of failure are found from the precision control of the positioner assembly,welding operation,atmosphere protection and control and other aspects. The welding process is improved from the close welding operation,weld clearance,environmental and other aspects. Through above measures,the welding quality and the primary qualification rate of radiographic inspection of weld are sharply improved,which provides valuable experience for the practical application of narrow gap TIG welding technology in domestic nuclear island main equipment.