高功率CO_2激光焊接等离子体控制实验研究  

Study of Plasma Control in High power CO 2 Laser Welding

作　　者：唐霞辉[1] 朱海红[1] 朱国富 李家熔 李再光 

机构地区：[1]华中理工大学激光加工国家工程研究中心

出　　处：《中国激光》1997年第2期174-178,共5页Chinese Journal of Lasers

摘　　要：采用精密的侧吹辅助气体调节和控制装置，实验研究了等离子体控制的各种工艺参数；采用光电晶体管检测熔池表面及小孔内等离子体光强变化；从理论上分析了等离子体控制的机理．结果表明：当辅助气体流量变化时，等离子体控制效果呈现三个区间．无论采用何种气体，只要辅助气体的操作压力稍大于金属蒸气压力。A series of technological parameters in controlling plasma in high power CO 2 laser welding were investigated by using a precise declined blow system for assist gas regulating and controlling. The plasma light intensity above molten pool and in key hole was also measured by phototransisters. The plasma control mechanism was theoretically analysed. The results show that plasma control effect was divided into three regions with the change of assist gas flow quantity. No matter what gas species were used, plasma can be best controlled only was the assist gas operation pressure slightly higher than the metallic vapour pressure.

关 键 词：激光焊接 等离子体控制 辅助气体 

分 类 号：TG456.7[金属学及工艺—焊接]