激光-气体金属电弧复合焊接高强钢板的焊缝形成和电信号分析  

Analysis of Weld Formation and Electrical Signal in CO_2 Laser-Gas Metal Arc Hybrid Welding of High Strength Steel

作　　者：刘双宇[1] 张宏[1] 刘凤德[1] 石岩[1] 徐春鹰[1] 王宇琪 

机构地区：[1]长春理工大学机电工程学院,吉林长春130022 [2]内蒙古第一机械制造集团有限公司工艺研究所,内蒙古包头014032

出　　处：《激光与光电子学进展》2011年第10期111-117,共7页Laser & Optoelectronics Progress

基　　金：新世纪优秀人才支持计划(XSJ2008-1);国家科技部基础研究(2009DFB70360)资助课题

摘　　要：以7．0mm厚高强钢板为试验材料，采用CO2激光-气体金属电弧（GMA）复合焊接方法，研究了全熔透状态下光丝间距对复合焊接焊缝形成、熔滴过渡特征、电压和电流概率密度分布的影响。结果表明：当光丝间距小于电弧弧柱半径时，焊缝形貌为“鸡尾酒杯”形状；当光丝间距接近或稍大于电弧弧柱半径时，焊缝形貌为“圆锥”形状，并且此时的有效连接面积最大。随着光丝间距的增加，熔滴由颗粒过渡转变为射滴过渡，使焊接过程更加稳定。汉诺威分析仪定量分析结果表明，当光丝间距在2～6mm范围内时，焊接电压和电流概率密度分布曲线向中间收敛且大电流和大电压区概率较小，此时有利于焊接过程的稳定。A CO2 laser-gas metal arc （GMA） hybrid welding technology is used to weld the 7.0-mm-thick high strength steel. The effects of the distance between laser and arc on the weld shape, droplet transfer characteristics, probability density distribution of arc voltages and current are investigated. When the distance between the two heat sources is less than the arc plasma radius, the cross-sections are the ＂cocktail glass＂ figurate morphology. When the distance between the laser and arc is significantly greater than or approximately the same as the arc plasma radius, the cross-section of weld indicates the ＂cone-shaped＂ figurate morphology. When the laser passes through the edge of the arc plasma, the maximum effective joint area is achieved. When the distance of the two heat sources （DLA） is 2 -6 mm, probability density distribution of arc current converges toward center and the range of high current and voltage is smaller, which favors the stability of the droplet transfer and hybrid welding processes.

关 键 词：激光技术 复合焊接 焊缝形貌 信号处理 

分 类 号：TG456.7[金属学及工艺—焊接]