| TIG电弧对高功率CO2激光光束特性的影响 |
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| 引用本文： | 张寰臻,吴世凯,肖荣诗.TIG电弧对高功率CO2激光光束特性的影响[J].焊接学报,2009,30(7):29-32. |
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| 作者姓名： | 张寰臻 吴世凯 肖荣诗 |
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| 作者单位： | 北京工业大学激光工程研究院,北京,100124 |
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| 基金项目： | 北京市教委科技发展计划重点项目，教育部新世纪优秀人才支持计划，北京工业大学111人才工程资助项目 |
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| 摘 要： | 采用功率计、光束光斑质量诊断仪及高速摄像仪等先进手段,研究了直流TIG电弧对垂直作用的CO_2激光光束特性的影响.结果表明,电弧将吸收部分激光能量,吸收率随电弧电流及激光功率的增加而增加,且作用位置越靠近阳极吸收率越高.与此同时,电弧等离子体的折射效应使激光光束散焦、变形并向阴极方向偏转.入射的激光功率越高、电弧电流越大、激光作用位置越靠近阳极,光束散焦和变形越明显.电弧对激光的吸收和散焦的共同作用,使穿过电弧的激光功率密度显著降低.Abstract：By instruments such as the laser power meter, the beam diagnosis and the fast CCD camera, the effects of the DC TIG arc on the characteristics of a vertically incident CO_2 laser beam were investigated. The experimental results demonstrate that part of the laser beam energy is absorbed by the arc plasma. This absorption increases with the increase of the arc current and the incident laser power, and becomes more evident as the laser beam incident position is closer to the anode. Meanwhile, the laser beam will be defo-cused, deformed and deviated to the cathode due to the arc refraction. The beam defocusing, deformation and deviation become more obvious with increasing the arc current and the incident laser power, and impinging the laser beam closer to the anode. The combined effect of the absorption and defocusing causes the power density decreases sharply as the beam passes through the arc.
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| 关 键 词： | CO_2激光 电弧 吸收 折射 负透镜 |
| 收稿时间： | 2008/6/25 0:00:00 |
Influence of TIG arc on characteristics of high power CO2 laser beam |
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| ZHANG Huanzhen,WU Shikai and XIAO Rongshi.Influence of TIG arc on characteristics of high power CO2 laser beam[J].Transactions of The China Welding Institution,2009,30(7):29-32. |
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| Authors: | ZHANG Huanzhen WU Shikai and XIAO Rongshi |
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| Affiliation: | Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China,Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China and Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | By instruments such as the laser power meter, the beam diagnosis and the fast CCD camera, the effects of the DC TIG arc on the characteristics of a vertically incident CO_2 laser beam were investigated. The experimental results demonstrate that part of the laser beam energy is absorbed by the arc plasma. This absorption increases with the increase of the arc current and the incident laser power, and becomes more evident as the laser beam incident position is closer to the anode. Meanwhile, the laser beam will be defo-cused, deformed and deviated to the cathode due to the arc refraction. The beam defocusing, deformation and deviation become more obvious with increasing the arc current and the incident laser power, and impinging the laser beam closer to the anode. The combined effect of the absorption and defocusing causes the power density decreases sharply as the beam passes through the arc. |
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| Keywords: | CO_2 laser arc absorption refraction negative lens |
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