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| TiO2活性剂对不锈钢激光焊接等离子体声发射效应的影响 |
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罗怡1,2, 谢小健1,2, 韩静韬1, 朱亮1, 万瑞2, 王子琪2
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1.重庆理工大学 材料科学与工程学院, 重庆 400054;2.重庆市特种焊接材料与技术高校工程研究中心, 重庆 400054
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| 摘要: |
| 针对不锈钢采用添加TiO2活性剂进行活性脉冲激光焊接研究，通过实时检测焊接过程的结构负载声发射信号，研究了激光焊接过程等离子体信息的表征方法及其活性焊接机理.结果表明，添加TiO2活性剂增强了材料对激光能量的吸收，增强了等离子体的能量及其对材料的传热，从而影响焊接过程传热效应，这是添加TiO2活性剂的脉冲激光焊接熔深增加的主要机理.利用实时检测焊接过程中的等离子体声发射信号可以对活性脉冲激光焊接过程的等离子体变化行为进行检测和评估.由焊接过程中采集得到的等离子体声发射信号统计而来的振铃计数特征值，以及计算而来的RMS波形和相应信号的功率谱分布，均反映了活性剂的添加增强了激光焊接过程等离子在时频域上的活动. |
| 关键词: 活性剂 脉冲激光焊 等离子体 声发射 |
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| 基金项目:重庆市教委科学技术研究资助项目（KJ1400930）；重庆市基础与前沿研究计划资助项目（cstc2015jcyjA60009）；重庆市高等学校青年骨干教师资助计划 |
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| Influence of TiO2 activating flux on acoustic emission effect in pulsed laser beam welding of stainless steel |
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LUO Yi1,2, XIE Xiaojian1,2, HAN Jingtao1, ZHU Liang1, WAN Rui2, ZHU Yang2
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1.School of Materials and Engineering, Chongqing University of Technology, Chongqing 400054, China;2.Chongqing Municipal Engineering Research Center of Institutions of Higher Education for Special Welding Materials and Technology, Chongqing 400054, China
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| Abstract: |
| The structure-borne acoustic emission (AE) signals during activating flux pulsed laser beam welding of stainless steel were detected in real-time. According to the AE signals, the characterization method of plasma flume information and the mechanism of activating flux welding were studied. The results showed that the TiO2 activating flux improves the absorption to laser energy, which reinforces the energy intensity of plasma in welding process and increases the heat transfer to materials. The behavior of plasma was tested and evaluated by AE signals of plasma detected in activating flux welding process. The calculation about AE count of plasma AE signals, root mean square (RMS) waveforms and power spectrum distribution reflect the improvement of plasma energy intensity in activating flux pulsed laser beam welding. |
| Key words: activating flux pulsed laser beam welding plasma acoustic emission |
