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不锈钢CO2激光焊接等离子体行为特性实验研究
引用本文:李妍坤,邹江林,牛建强,张心怡,肖荣诗.不锈钢CO2激光焊接等离子体行为特性实验研究[J].应用激光,2012,32(3):180-183.
作者姓名:李妍坤  邹江林  牛建强  张心怡  肖荣诗
作者单位:李妍坤:北京工业大学激光工程研究院, 北京 100124
邹江林:北京工业大学激光工程研究院, 北京 100124
牛建强:北京工业大学激光工程研究院, 北京 100124
张心怡:北京工业大学激光工程研究院, 北京 100124
肖荣诗:北京工业大学激光工程研究院, 北京 100124
摘    要:采用3.5kW Slab CO2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。

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
收稿时间:2012/5/22

Experimental Study on Plasma Characteristics in CO2 Laser Welding of Stainless Steel
Li Yankun,Zou Jianglin,Niu Jianqiang,Zhang Xinyi,Xiao Rongshi.Experimental Study on Plasma Characteristics in CO2 Laser Welding of Stainless Steel[J].Applied Laser,2012,32(3):180-183.
Authors:Li Yankun  Zou Jianglin  Niu Jianqiang  Zhang Xinyi  Xiao Rongshi
Affiliation:(Institute of Laser Engineering,Beijing University of Technology,Beijing100124,China)
Abstract: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 3.5kW 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.
Keywords:CO2 laser welding  laser-induced plasma  relative intensity method  electron temperature  processing stability
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