工艺参数对铝合金CO_2激光焊接光致等离子体温度的影响  

Influence of welding parameters on laser-induced plasma temperature in CO_2 laser welding of aluminum alloys

作　　者：祁俊峰[1] 丁鹏[1] 张冬云[1] 左铁钏[1] 

机构地区：[1]北京工业大学激光工程研究院,北京100124

出　　处：《焊接学报》2008年第6期97-100,118,共5页Transactions of The China Welding Institution

摘　　要：利用Spectra Pro2500i瞬态光谱仪对6061铝合金CO2激光焊接光致等离子体的发光谱进行了测量,分析得到的200~600 nm范围内的Mg I特征谱线,利用玻尔兹曼图法计算得到光致等离子体的平均温度。分别研究了激光功率、焊接速度、焦点位置、辅助气体等工艺参数对光致等离子体平均温度的影响,并对其原因进行了分析。在试验条件下,当激光功率超过材料深熔焊接阈值功率后,激光功率对光致等离子体温度的影响不大,约为6 000 K;焊接速度对光致等离子体温度的影响表现为'倒U形'曲线规律;对于一定内径的辅助气体喷嘴,等离子体温度随辅助气体流量呈现先增加后减小的趋势;在氦气中加入氩气会导致光致等离子体温度升高500~1 000 K左右。The spectrums of laser-induced plasma in CO2 laser welding of 6061 aluminum alloy are measured through PI Pro2500i transient spectrometer.Boltzmann diagrams can be used to calculate the average temperature of laser-induced plasma,which are deduced from MgⅠspectrums between 200-600 nm.The influence of welding parameters,such as laser power,welding speed,focus position and shielding gas,on laser-induced plasma temperature are investigated separately and the reasons are also discussed.Under the experimental co...

关 键 词：激光焊接 铝合金 光致等离子体 光谱 

分 类 号：TG456.7[金属学及工艺—焊接]