YAG激光焊接脉冲能量作用效应的声发射特征参数表征  

Characterization of impact effect of pulse energy based on feature parameters of acoustic emission signals detected in YAG laser welding

作　　者：朱洋[1,2] 罗怡[1,2] 谢小健[1,2] 万瑞[1,2] 

机构地区：[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

出　　处：《焊接学报》2017年第2期115-119,共5页Transactions of The China Welding Institution

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)

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.Pulse YAG laser welding was used for the welding of stainless steel. The stability of welding process was studied based on the structure-borne acoustic emission( AE)signals released by the interaction effect of laser heat source and materials researched,which was characterized by scatters feature distribution of average peak-AE count. The result showed that the scatters distribution aggregation of average peak-AE count feature distribution was better as the process of pulse laser welding was stable. Conversely,the scatters distribution aggregation was more divergent. With the increase of laser pulse peak power,the average peak and AE counts of laser pulse AE event increased,which indicated that the AE count was more sensitive to the stability fluctuation of welding process induced by the laser pulse peak power. Consequently,it was possible to characterize the stability of laser welding process by the methodology of scatters feature distribution of average peak-AE count.

关 键 词：声发射 激光焊接 特征参数 稳定性 

分 类 号：TG456.7[金属学及工艺—焊接]