Research on scanning laser micro-connection technology of 304 stainless steel for nuclear power

核电用304不锈钢扫描激光微连接工艺研究 Research on scanning laser micro-connection technology of 304 stainless steel for nuclear power 梁晓梅 LIANG xiaomei 1 first-author 黄瑞生 HUANG ruisheng 1 刘金湘 LIU jinxiang 2 杨义成 YANG yicheng 1 邹吉鹏 ZOU jipeng 1 王猛 WANG meng 3 哈尔滨焊接研究院有限公司 哈尔滨焊接研究院有限公司 Harbin Welding Institute Limited Company Harbin Welding Institute Limited Company 浙江富春江水电设备有限公司 浙江富春江水电设备有限公司 Zhejiang Fuchunjiang Hydropower Equipment Limited Company Zhejiang Fuchunjiang Hydropower Equipment Limited Company 哈尔滨威尔焊接有限责任公司 哈尔滨威尔焊接有限责任公司 Harbin Weir Welding Limited Company Harbin Weir Welding Limited Company 分别采用激光"○"扫描焊、激光"|"扫描焊及激光"8"扫描焊方法焊接核电用控制棒导向筒304不锈钢,并与常规激光焊进行对比,分析扫描幅度、扫描频率等主要工艺参数对焊缝成形、焊接气孔的影响规律,对导向筒模拟件焊接接头进行综合质量评估。结果表明,三种扫描焊方法在焊缝成形、焊接气孔控制等方面均优于常规焊,且不同光斑扫描路径对焊接气孔的抑制程度存在差异",○"扫描焊最优;若要发挥扫描焊抑制气孔的作用,扫描幅度、扫描频率均须达到阈值,且超出阈值后,适当增大扫描幅度或扫描频率均可增强抑制气孔的效果,当扫描幅度为2 mm、扫描频率为50 Hz时,未检测到焊接气孔;"○"扫描焊焊接接头具有良好的耐腐蚀性能,变形量可控制在0.3 mm以内。 For welding control rod guide tube 304 stainless steel for nuclear power,the " ○ "-shaped laser scanning welding,the " | "-shaped laser scanning welding and the "8"-shaped laser scanning welding methods were used to compare with the conventional laser welding. The influence of the main welding parameters such as scanning amplitude and scanning frequency on the appearance of weld and the welding pores were analyzed,in addition,a comprehensive quality evaluation was performed on the butt joints of the 7 mm thick guide cylinder simulation. The results show that the three laser scanning welding methods are superior to the conventional laser welding in the aspects of the appearance of weld and the welding pore,and there are differences in the inhibition degree of welding pores by different spot scanning paths,in general,the "○"-shaped laser scanning welding is the best. If want the laser scanning welding takes effect to inhibit the welding pores,the scanning amplitude and scanning frequency need to reach the threshold,and when exceeding the threshold,increasing the scanning amplitude or frequency properly can enhance the effect of inhibiting pores. When the scanning amplitude is 2 mm and the scanning frequency is 50 Hz,there is no welding pore in weld. The welded joint has a good corrosion resistance,and the deformation can be controlled within 0.3 mm. 导向筒 不锈钢 激光扫描焊 光斑扫描路径 焊接气孔 guide tube stainless steel laser scanning welding spot scanning path welding pores TM623;TG456.7 国家科科技重大专项课题(2018ZX04044001) 2022-03-08 7 50