| 光学传感器对水下Nd:YAG深熔激光焊接过程检测的研究 |
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| 引用本文： | 张旭东,陈武柱,芦田荣次,松田福久.光学传感器对水下Nd:YAG深熔激光焊接过程检测的研究[J].应用激光,2002,22(2):177-180. |
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| 作者姓名： | 张旭东 陈武柱 芦田荣次 松田福久 |
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| 作者单位： | 1. 清华大学机械工程系,北京,100084
2. 日本发电设备技术检查协会 |
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| 摘 要： | 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。
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| 关 键 词： | 水下激光焊接 过程检测 光辐射 焊缝质量 局部干燥区 |
Process sensing of underwater Nd:YAG laser keyhole welding with optical sensor |
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| Xudong ZHANG,Wuzhu CHEN.Process sensing of underwater Nd:YAG laser keyhole welding with optical sensor[J].Applied Laser,2002,22(2):177-180. |
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| Authors: | Xudong ZHANG Wuzhu CHEN |
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| Institution: | Xudong ZHANG,Wuzhu CHEN Department of Mechanical Engineering,Tsinghua University,Beijing 100084,P.R.China
Eiji AHIDA,Fukuhisa MATSUDA Tarasaki R&D Center,JAPEIC,Hitachinaka,Ibaraki,312-0003,Japan |
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| Abstract: | In this paper, the monitoring of process stability in underwater laser keyhole welding with infrared optical sensor was investigated. The experiment of wet underwater welding showed that a kind of plasma with strong shielding effect to laser beam formed when the water depth was larger than several millimeters, which considerably reduces the penetration depth. Correspondently, the average value of the detected signal intensity abruptly dropped, indicating complete extinguishment of metal plume. Several gas - shielding nozzles with different diameters were used to form local dry cavity for underwater LBW. The relationship between the detected optical signals and the weld quality under various shielding conditions was investigated. |
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| Keywords: | Underwater Nd: YAG laser welding monitoring optical sensor local dry cavity |
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