CO2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 CO2 laser welding(3) Relationship between optical signal and penetration statuses for oblique-plate welding

关键词:  激光焊接  同轴检测  熔透  斜板

Key words:  laser welding  coaxial monitoring  penetration  oblique plate

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2~6 kHz段频谱重心最小。

Abstract:

Using a coaxial monitoring system for detecting the optical emission in CO₂ 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".