激光-MAG复合焊等离子体辐射分析  

Analysis of laser-MAG hybrid welding plasma radiation

作　　者：李志勇[1] 王威[2] 王旭友[2] 李桓[3] 

机构地区：[1]中北大学焊接研究中心,太原030051 [2]哈尔滨焊接研究所,哈尔滨150080 [3]天津大学材料学院,天津300072

出　　处：《焊接学报》2010年第3期21-24,28,共5页Transactions of The China Welding Institution

基　　金：国家科技部支撑项目(2006BAF04B10);国家自然基金资助项目(50505048);黑龙江省自然科学基金资助项目(ZJG0610)

摘　　要：对于MAG焊、激光-MAG复合焊的等离子体辐射,采用中空探针,使特定点的辐射通过探针对其等离子辐射进行空间分布采集,对比分析激光复合前后等离子体辐射光谱的分布规律,并结合高速摄像,为激光-MAG复合焊的耦合机理研究和工程应用提供理论基础.结果表明,激光复合后,在电弧中心形成一个辐射明显增大的区域,区域外侧存在一个辐射降低区域;在电弧前侧激光复合作用位置,会形成一个以铁辐射谱线为主的"电离通道".激光复合后,电离通道的存在为电弧的稳定提供了基础;在中心区形成了能量集中的辐射通道,改变了电弧中能量的分布,使能量更集中于中心区域,获得比传统MAG焊更大的熔深.Hollow probe is used to detect the plasma radiation of specific point passing the probe for spectrum collecting. The radiation of MAG and laser-MAG hybrid welding are collected with fiber spectrometer. The spatial distribution of the radiation is analyzed to compare the differences between welding process with and without laser hybrid. Furthermore, high speed video is also applied to study the coupling mechanics of laser-MAG hybrid. The result shows that a higher radiation intensity zone will be formed in the arc center. Beside the center zone, there is a somewhat lower radiation intensity zone. An ‘ionized duct zone’ will be formed near the laser focused point. The ionized duct is dominated by Fe fume. The ionized duct makes the welding arc more stable when the laser is applied. The higher radiation intensity zone changes the distribution of plasma energy, thus makes the energy focus on the arc center. The coupling effect of laser-MAG hybrid welding will form weld bead with deeper penetration than MAG welding.

关 键 词：激光 MAG焊 复合焊 等离子体 光谱 

分 类 号：TG422[金属学及工艺—焊接]