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水下激光焊接是一种用于核电站堆芯构件和压力容器的关键维修技术,本文对水下激光焊接产生的红外光辐射信号与焊接质量的关系进行了研究。实验结果表明,当工件表面的水深超过3mm时,一种蓝色的非金属等离子体将形成并对激光产生强烈的衰减,焊缝的熔深不到正常焊接条件下的1/20。利用气体喷嘴在工件表面形成局部于燥空间,研究了不同喷嘴直径、气体流量条件下光信号和焊缝质量的关系,得到了光信号的波动幅值与局部干燥空间的合适保护条件的关系。
Underwater laser welding is a key maintenance technology used in nuclear reactor core components and pressure vessels. In this paper, the relationship between the infrared radiation signal generated by underwater laser welding and welding quality was studied. The experimental results show that a blue non-metallic plasma will form and strongly attenuate the laser when the surface water depth exceeds 3mm. The weld penetration is less than 1/20 of the normal welding condition. The relationship between the optical signal and the quality of the weld under different nozzle diameters and gas flows was studied. The relationship between the amplitude of the optical signal and the suitable protection conditions of the local dry space was obtained.