| 激光深熔焊声源发声机理 |
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| 引用本文： | 山河,罗震,张成大,敖三三,孟繁亮.激光深熔焊声源发声机理[J].焊接学报,2016,37(8):26-30. |
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| 作者姓名： | 山河 罗震 张成大 敖三三 孟繁亮 |
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| 作者单位： | 1.天津大学 焊接与先进制造技术研究所, 天津 300350 |
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| 基金项目： | 国家自然科学基金资助项目(51405335、51275342)；广东省省级科技计划项目(2013B090600149)；中国博士后特别资助项目(2014T70212) |
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| 摘 要： | 声信号是激光焊接过程中重要的质量检测参量，目前对于激光声信号的发声机理认识还不够深刻.文中对激光深熔焊过程中声源发声机理和熔池小孔形貌进行了深入研究.首先参考声学中亥姆霍兹效应，通过声电类比，得到小孔形貌与声音信号强度和共振频率的关系.采用CCD图像采集系统获得小孔实际形貌，验证理论研究所得结果的合理性.通过声信号采集系统获取给定焊接工艺参数下的激光焊接声场数据，进行快速傅里叶变换处理，获得声场幅值谱图.结果表明，试验数值与理论值相吻合，证明所提出的小孔发声机理具有较好的适用性.
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| 关 键 词： | 激光焊接 声信号 小孔发声机理 小孔形貌 声信号处理 |
| 收稿时间： | 2015/11/20 0:00:00 |
Mechanism of sound source in laser deep penetration welding process |
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| SHAN He,LUO Zhen,ZHANG Chengd,AO Sansan and MENG Fanliang.Mechanism of sound source in laser deep penetration welding process[J].Transactions of The China Welding Institution,2016,37(8):26-30. |
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| Authors: | SHAN He LUO Zhen ZHANG Chengd AO Sansan and MENG Fanliang |
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| Affiliation: | 1.Institute of Welding and Advanced Manufacturing Technology, Tianjin University, Tianjin 300350, China2.The second Oil Production Plant, Daqing Oil Field Co., Daqing 163459, China3.Institute of Welding and Advanced Manufacturing Technology, Tianjin University, Tianjin 300350, China;Tianjin Institute of Metrological Supervision and Testing, Tianjin 300192, China |
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| Abstract: | Acoustic signal is an important parameter in laser welding process, and the understanding of mechanism of the laser acoustic signal is not deep enough. A thorough research on the mechanism of sound source and keyhole profile during laser deep penetration welding process were carried out. By considering the Helmholtz effect in acoustics, the relationship between the morphology of the keyhole and the intensity of the sound signal and the resonance frequency was obtained through the acoustic-electric analogy. CCD image acquisition system was used to obtain the actual shape of the hole, and the rationality of the results obtained from the theoretical study was verified. Through the acoustic signal acquisition system, the acoustic data in laser welding process were acquired, and the amplitude spectrum of sound field was obtained by the fast FFT transform. The results show that the experimental results are in good agreement with the theoretical values, and the proposed acoustic mechanism of keyhole is suitable for application. |
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| Keywords: | laser welding acoustic signal mechanism of keyhole keyhole profile acoustic signal processing |
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