中国激光, 2007, 34 (s1): 269, 网络出版: 2009-05-25  

船用钢板大功率CO2激光深熔焊等离子体研究

Research on Plasma in High Power CO2Laser Welding of Ship Plate
作者单位
上海交通大学焊接研究所激光制造实验室, 上海 200031
摘要
焊接过程中产生的等离子体是激光深熔焊的固有现象,它通过对激光能量的吸收、折射、反射等降低到达小孔的激光能量密度,影响激光与工件相互作用。使用微距高速摄影系统,研究了大功率CO2激光焊接不同功率和不同侧吹气体流量下等离子体的形态和尺寸的变化规律。在相同条件下,激光功率越大,等离子体的尺寸越大,而且越不稳定,容易出现激光维持的燃烧(LSC)波,严重影响焊接过程的稳定性。而通过增加侧吹气体的流量,可以有效抑制LSC波的产生,并且减小等离子体的尺寸,增加焊缝熔深。
Abstract
Plasma is produced in deep penetration laser welding. It influencs the interaction between laser source and workpiece plate according to laser beam absorption, reflection as well as refraction etc. Based on micro-focus high speed photograph, dynamic behavior and size of plasma were studied in different laser power and different flow rate of side assist gas. It is discovered that the plasma is larger and more unstable with the increase of laser power density. And the whole process is more susceptible to LSC(Laser Supported Combustion), even resulting in welding discontinuity. By increasing the flow rate of side-assist gas, LSC is supressed and the size of the plasma becomes smaller. Correspondingly, the penetration is slightly deeper with smaller plasma.

李国华, 王广伟, 蔡艳, 高志国, 吴毅雄. 船用钢板大功率CO2激光深熔焊等离子体研究[J]. 中国激光, 2007, 34(s1): 269. 李国华, 王广伟, 蔡艳, 高志国, 吴毅雄. Research on Plasma in High Power CO2Laser Welding of Ship Plate[J]. Chinese Journal of Lasers, 2007, 34(s1): 269.

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