双光束激光填丝焊工艺对铝合金焊接气孔率的影响  

Effect of process parameters on porosity formation ratio in dual-beam laser welding of aluminum alloys with filler wire

作　　者：雷正龙 李颖[1] 陈彦宾[1] 孙忠绍 张益坤[2] 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001 [2]首都航天机械公司,北京100076

出　　处：《焊接学报》2013年第2期40-44,115,共5页Transactions of The China Welding Institution

基　　金：中国博士后科学基金资助项目(20090460885)

摘　　要：以LF6铝合金为材料,CO2激光为热源,开展了双光束激光填丝焊气孔特性分析.与单光束激光填丝焊及双光束自熔焊相比,双光束激光填丝焊能够抑制气孔的产生,尤其是并行双光束激光焊抑制气孔效果更明显.在此基础上进一步分析了保护气体成分和激光能量对焊接气孔率的影响.结果表明,采用氦气保护时,等离子体对激光的屏蔽作用小,能够稳定焊接过程;激光功率过大或者过小都会导致匙孔的不稳定,造成焊缝气孔率增加.The characterizations of porosity in dual-beam laser welding with filler wire of LF6 aluminum alloys were studied.Compared with the single beam laser welding with filler wire and the dual-beam laser self-fusible welding,the dual-beam laser welding with filler wire can restrain the porosity formation.Especially,the dual-beam laser welding with parallel arrangement has a better effect on inhibition of porosity.Furthermore,the effects of shielding gas component and laser energy on porosity formation ratio were analyzed.The results show that,when the helium is used as the shielding gas,the area of plasma decreases as well as the shielding effect of the plasma on laser deceases,and the welding process become more stable.At the same time,the laser power must be proper,and both too high and too low laser power make the porosity formation ratio enlarged.

关 键 词：双光束激光填丝 气孔 工艺参数 铝合金 

分 类 号：TG456.7[金属学及工艺—焊接]