不锈钢CO_2激光焊接等离子体行为特性实验研究  

Experimental Study on Plasma Characteristics in CO_2 Laser Welding of Stainless Steel

作　　者：李妍坤[1] 邹江林[1] 牛建强[1] 张心怡[1] 肖荣诗[1] 

机构地区：[1]北京工业大学激光工程研究院,北京100124

出　　处：《应用激光》2012年第3期180-183,共4页Applied Laser

摘　　要：采用3.5kW Slab CO_2激光焊接不锈钢,利用高速摄像观测焊接等离子体形态,采用光谱仪探测等离子体光谱,并利用相对强度法计算等离子体电子温度。结果表明:在氦气保护下,等离子体高度随时间周期性振荡,振荡频率约为530Hz;熔池表面附近等离子体的温度为8392K左右。进一步分析表明,等离子体对入射激光的吸收不足10%;等离子体周期性振荡对焊接过程稳定性影响不明显。In this paper, the laser-induced plasma was observed and detected separately by applying a high speed camera and a spectrometer in welding of stainless steel with a 3.SkW slab CO2 laser. Plasma temperature was obtained with the relative intensity method. The results show that, in the condition with helium as shielding gas, the laser-induced plasma fluctuates periodically with a frequency of about 530Hz, and the plasma temperature is about 8392K above the weld pool. Further analysis demonstrates that the plasma absorption to the incident laser beam is less than 10 %, and the periodic fluctuation of the laser induced plasma seldom affects the welding process stability.

关 键 词：CO2激光焊接 光致等离子体 谱线相对强度法 电子温度 过程稳定性 

分 类 号：TN456.7[电子电信—微电子学与固体电子学]