CO_2激光焊接的同轴检测与熔透控制 Ⅲ.板厚变化时熔透状态同轴光信号分析  

Coaxial monitoring and penetration control in CO_2 laser welding (3) Relationship between optical signal and penetration statuses for oblique-plate welding

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》2006年第1期13-16,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50175061)

摘　　要：利用CO2激光深熔焊等离子体光信号的同轴检测系统，对工件板厚变化时激光焊接熔透状态的同轴光信号进行了时域和频域分析。结果表明，“适度熔透”状态时对应的等离子体同轴光信号强度最大，“未熔透”与“过熔透”状态对应的信号强度均小于“适度熔透”；频域分析表明，“适度熔透”状态对应的2～6kHz段频谱重心最小。Using a coaxial monitoring system for detecting the optical emission in CO_2 laser beam welding,the time-field and frequency-field characteristics of the coaxial optical signals under different penetration statuses for welding of oblique plates were studied in this paper.The experimental results showed that under constant laser power and welding speed,the signal intensity varied with varying thickness and the signal intensity was maximum at the 'moderate full penetration'.In frequency field,the barycenter of frequency spectrum(FBC) of 2-6kHz range was minimum at the 'moderate full penetration'.

关 键 词：激光焊接 同轴检测 熔透 斜板 

分 类 号：TG456.7[金属学及工艺—焊接]