| 不同熔透状态下高功率CO2激光堆焊光致等离子体特征分析 |
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| 引用本文： | 蔡艳,戎磊,孙大为,李国华,吴毅雄. 不同熔透状态下高功率CO2激光堆焊光致等离子体特征分析[J]. 上海交通大学学报, 2011, 45(1): 56-0060 |
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| 作者姓名： | 蔡艳 戎磊 孙大为 李国华 吴毅雄 |
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| 作者单位： | （上海交通大学 上海市激光制造与材料改性重点实验室， 上海 200240）
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| 基金项目： | 上海市科学技术委员会资助项目(09QA14027000) |
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| 摘 要： | 提出了一种适用于高功率CO2激光焊缝熔透状态的在线监测方法，设计了不同熔透状态的高功率CO2激光堆焊焊接试验，采用高速摄影技术获取焊接过程中连续变化的光致等离子体图像，编程实现基于最大类间方差的图像分割，计算了光致等离子的高度、底部宽度和面积，得到了特征参数的概率密度分布图和变异系数，并分析了光致等离子体面积的频谱特征.结果表明：在焊缝未熔透时，光致等离子体的高度和面积均显著大于熔透状态时；焊缝未熔透状态的光致等离子体的面积波动频率约为400 Hz.
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| 关 键 词： | 高功率CO2激光焊 光致等离子体 熔透性 特征参数 频谱分析 |
| 收稿时间： | 2010-06-22 |
Characteristic Analysis on Laser Induced Plasma of Different Penetration Condition in High Power CO_2 Laser Welding |
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| CAI Yan,RONG Lei,SUNDa-wei,LI Guo-hua,WU Yi-xiong. Characteristic Analysis on Laser Induced Plasma of Different Penetration Condition in High Power CO_2 Laser Welding[J]. Journal of Shanghai Jiaotong University, 2011, 45(1): 56-0060 |
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| Authors: | CAI Yan RONG Lei SUNDa-wei LI Guo-hua WU Yi-xiong |
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| Affiliation: | CAI Yan,RONG Lei,SUNDa-wei,LI Guo-hua,WU Yi-xiong(Shanghai Key Laboratory of Laser Processing and Materials Modification,Shanghai Jiaotong University,Shanghai 200240,China) |
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| Abstract: | Anovel on-line monitoring method was proposed for high power CO2laser welding.Agroup of comparison tests were designed to get continuous high-speed photography of laser induced plasma.The height,bottom width and area of laserinduced plasma were calculated withi mage segment based on OTSU algorithm.The experi mental results showthat the difference of plasma height and area is great between full penetration condition and partial penetration condition accordingtotheir probability density graphs and coefficient... |
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| Keywords: | high power CO2laser welding laser induced plasma penetration characteristic parameters frequency analysis |
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