YAG激光焊接脉冲能量作用效应的声发射特征参数表征

发布时间：2018-04-10 21:41

本文选题：声发射 + 激光焊接　；参考：《焊接学报》2017年02期

【摘要】：对304不锈钢进行脉冲激光焊接试验,基于激光热源与工件相互作用所释放的声发射信号,研究利用声发射事件的平均峰值—振铃计数特征分布图评估焊接稳定性的方法.结果表明,脉冲激光对材料的作用越稳定,平均峰值—振铃计数特征分布图的散点分布聚集性越好;脉冲激光对材料的作用稳定性越差,平均峰值—振铃计数特征分布图的散点分布越发散.激光脉冲峰值功率增加时,对应声发射事件平均峰值和振铃计数均随之增加,反映出振铃计数对峰值功率变化而引发的焊接稳定性变化更为敏感.因此平均峰值—振铃计数特征分布图能够较为准确地表征激光焊接过程稳定性.
[Abstract]:Based on the acoustic emission signal released by the interaction between laser heat source and workpiece, the method of evaluating welding stability by using the characteristic distribution of the average peak value of acoustic emission event and the counting characteristic of ringing bell is studied in the experiment of 304 stainless steel by pulsed laser welding.The results show that the more stable the effect of pulsed laser on the material, the better the distribution and aggregation of the characteristic distribution of the average peak-ring counting, the worse the stability of the pulsed laser on the material.The distribution of divergence points in the characteristic distribution of average peak-ring counting is more dispersed.When the peak power of laser pulse increases, both the average peak value of acoustic emission event and the ringing count increase, which indicates that the ring count is more sensitive to the change of welding stability caused by the change of peak power.Therefore, the characteristic distribution of average peak-ring counting can accurately characterize the stability of laser welding process.
【作者单位】：重庆理工大学材料科学与工程学院;重庆市特种焊接材料与技术高校工程研究中心;
【基金】：重庆市教委科学技术研究项目(KJ1400930) 重庆市高等学校青年骨干教师资助计划特种焊接材料与技术重庆市高校工程研究中心开放课题基金资助项目(SWMT201501)
【分类号】：TG456.7

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