局部干法水下激光焊接装置研制及工艺试验

Development and Process Test of a Local Dry Underwater Laser Welding Device

针对核电站乏池边角位置的水下修复需求,研制了一套局部干法水下激光焊接装置,可在实现常规水下平焊位置焊接的同时,重点兼顾角焊缝的局部干法水下焊接作业需求。同时,该装置还具备水下焊接位置的照明、焊接环境和焊接过程的实时监控、焊接区域的温湿度监测等功能。采用研制的局部干法水下焊接装置,对核电站乏池常用的304不锈钢材料进行了水下焊接工艺试验,结果表明:水下焊接焊缝的成形良好,水下焊缝的宏观形貌、截面形貌和金相组织与空气环境成形焊缝无显著差异。

A set of local dry underwater laser welding equipment has been developed to meet the underwater repair requirements of the corner positions of the spent fuel pool in nuclear power plants.It can achieve conventional underwater flat welding while focusing on the local dry underwater welding operation requirements of the fillet weld.At the same time,the device also has functions such as lighting for underwater welding positions,real-time monitoring of welding environment and welding process,and temperature and humidity monitoring of welding areas.The developed local dry underwater welding device was used to conduct underwater welding process tests on 304 stainless steel materials commonly used in the spent fuel pool of nuclear power plants.The results showed that the formation of underwater welding seams was good,and the macroscopic morphology,cross-sectional morphology,and metallographic structure of underwater welding seams were not significantly different from those formed in the air environment.The research results of this article lay a technical foundation for the underwater online repair of future spent fuel pools,as well as the underwater maintenance of key equipment in high-level environments such as nuclear power plant internals.