低功率激光诱导/增强电弧等离子体的行为与机制研究  

Behavior and mechanism of low power YAG laser induced and strengthened arc plasma

作　　者：宋刚[1] 刘黎明[1] 

机构地区：[1]大连理工大学材料科学与工程学院先进连接技术辽宁省重点实验室,116024

出　　处：《焊接》2010年第10期21-25,共5页Welding & Joining

基　　金：国家自然科学基金资助项目(50675028);高等学校博士学科点专项科研基金(20070141031)

摘　　要：激光与电弧复合焊接工艺研究日趋完善,而关于激光与电弧相互作用行为和物理机制的研究则明显滞后,限制了激光-电弧复合焊接自动控制系统及焊接装备的开发。文中采用光谱分析和带通滤波电弧图像采集相结合的方法,研究了AZ31镁合金复合焊接过程中低功率激光(500 W)的加入对电弧等离子体形状、粒子组成的影响规律。基于电弧导电通道的角度讨论了激光对电弧放电行为的影响机制。研究发现,与单独电弧焊相比,激光的加入使电弧等离子体的高温区发生明显聚集,电弧导电通道变窄;电弧等离子体区氩元素谱线的强度显著降低,而镁元素谱线的强度显著升高,表明电弧的放电形式由惰性气体电离放电为主转换为以金属粒子电离放电为主;复合焊接电弧谱线强度的变化以及电弧高温区域收缩为实现激光一电弧复合焊接过程质量控制系统的开发提供可靠途径。The research on laser + arc hybrid welding process focus on the influence of welding parameters to welding quality, not for the mechanism of the interaction between laser and arc plasma, which is an obstacle to the development of quality control systems and equipments of laser + arc hybrid welding. The effect of laser pulse on arc plasma was analyzed by studying the plasma spectrum and plasma shapes. On one hand, the intensities of emission spectral lines of Mg Ⅰ and Mg Ⅱ in hybrid welding are much stronger than that in TIG welding, while the intensities of the emission spectral lines of Ar Ⅰ and Ar Ⅱ in hybrid welding are a little weaker than that in TIG welding; On the other hand, laser pulse expands the arc plasma and concentrates the electric conducting route of arc plasma. All these increase the output power and energy density of arc plasma.

关 键 词：激光 电弧等离子体 光谱 导电通道 复合焊接 

分 类 号：TG403[金属学及工艺—焊接]