激光-电弧复合焊等离子体特性与焊缝熔深相关性研究

发布时间：2018-03-25 23:11

本文选题：机械制造工艺与设备　切入点：高氮钢　出处：《兵工学报》2017年05期

【摘要】：利用光谱仪、高速相机对激光-电弧两脉冲复合焊接过程的等离子体辐射光谱及电弧形态进行了采集。基于Boltzmann作图法和Stark展宽法计算了等离子体电子温度和电子密度,研究了不同激光脉冲作用时间和不同频率脉冲电弧对电子温度和电子密度的影响。结合等离子体发射光谱图和高速图像信息,分析了激光-电弧两脉冲复合焊等离子体物理特性。结果表明:随着激光脉冲作用时间的增加,电弧收缩,亮度提高,电子温度降低,电子密度升高,熔深值增大,光谱强度增加,焊缝中氮含量降低;随着电弧脉冲频率的增加,电弧体积变大,亮度提高,电子温度和电子密度均下降,熔深值呈现逐渐降低的趋势,焊缝区上部的电弧焊特征明显增强。
[Abstract]:The plasma radiation spectrum and arc shape of laser arc combined welding process were collected by using spectrometer and high speed camera. The plasma electron temperature and electron density were calculated based on Boltzmann drawing method and Stark broadening method. The effects of different laser pulse time and frequency on electron temperature and electron density are studied. The physical characteristics of plasma in laser-arc two-pulse composite welding are analyzed. The results show that with the increase of laser pulse action time, the arc shrinks, the brightness increases, the electron temperature decreases, the electron density increases, and the penetration value increases. With the increase of the frequency of arc pulse, the volume of arc becomes larger, the brightness increases, the electron temperature and electron density decrease, and the value of penetration decreases gradually. The arc welding characteristics of the upper part of the weld area are obviously enhanced.
【作者单位】：长春理工大学机电工程学院;
【基金】：国家自然科学基金项目(51305044)
【分类号】：TG456

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