| 摘要: |
| 利用CO2激光深熔焊等离子体光信号的同轴检测系统,提出了频谱重心的概念并以此来分析等离子体光信号的频谱特性,研究了平板焊接时对应适度熔透状态时同轴光信号的频域特征。结果表明,随激光功率增加或焊接速度减小,当焊接熔透状态从"适度熔透(小孔透)"变化到"仅熔池透"时对应2~6 kHz段频谱重心位置向上(高频)跳变。 |
| 关键词: 激光焊接 熔透 同轴检测 频谱重心 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(50175061);国家重大基础研究规划项目"973"(1998061500) |
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| Coaxial monitoring and penetration control in CO2 laser welding (Ⅱ)-Frequency-field characteristics of coaxial optical signals |
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ZHANG Xu-dong, CHEN Wu-zhu, LIU Chun, GUO Jing
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Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
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| Abstract: |
| By using a coaxial monitoring system for detecting the optical emission in CO2 laser beam welding, the frequency-filed characteristics of the coaxial optical signals under different penetration statues are studied. In frequency field analyzing, the FBC (barycenter of frequency spectrum) is presented to describe the characteristic of the frequency spectrum of the plasma optical signal. The experimental results show that as the laser power increase or welding speed decreases, the FBC of 2-6 kHz range jumps up to higher frequency when the penetration status transits from "moderate full penetration" to "weld pool penetration". |
| Key words: laser welding penetration coaxial monitoring barycenter of frequency spectrum |
