CO_2激光焊接的同轴检测与熔透控制 (Ⅱ)熔透状态同轴光信号的频域分析  

Coaxial monitoring and penetration control in CO_2 laser welding ( lI )-Frequency-field characteristics of coaxial optical signals

作　　者：张旭东[1] 陈武柱[1] 刘春[1] 国静[1] 

机构地区：[1]清华大学机械工程系,北京100084

出　　处：《焊接学报》2004年第5期25-28,32,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目 ( 5 0 175 0 61) ;国家重大基础研究规划项目"973"( 19980 615 0 0 )

摘　　要：利用CO2 激光深熔焊等离子体光信号的同轴检测系统 ,提出了频谱重心的概念并以此来分析等离子体光信号的频谱特性 ,研究了平板焊接时对应适度熔透状态时同轴光信号的频域特征。结果表明 ,随激光功率增加或焊接速度减小 ,当焊接熔透状态从”适度熔透 (小孔透 )”变化到”仅熔池透”时对应 2～ 6kHz段频谱重心位置向上 (高频 )跳变。By using a coaxial monitoring system for detecting the optical emission in CO_2 laser beam welding, the frequency -filed characteristics of the coaxial optical signals under different penetration statues are studied. In frequency field analyzing, the FBC ( barycenter of frequency spectrum) is presented to describe the characteristic of the frequency spectrum of the plasma optical signal. The experimental results show that as the laser power increase or welding speed decreases, the FBC of 2 - 6 kHz range jumps up to higher frequency when the penetration status transits from “moderate full penetration” to “weld pool penetration”.

关 键 词：澈光焊接 熔透 同轴检测 频谱重心 

分 类 号：TG456.7[金属学及工艺—焊接]