铜/镀锌钢异种金属Nd:YAG激光脉冲MIG复合热源钎接焊  

Braze-welding for dissimilar metals between copper and steel by Nd:YAG laser-plused MIG hybrid welding

作　　者：雷振[1] 秦国梁[1] 王旭友[1] 林尚扬[1] 

机构地区：[1]机械科学研究总院哈尔滨焊接研究所,哈尔滨150080

出　　处：《焊接学报》2007年第12期18-20,25,共4页Transactions of The China Welding Institution

基　　金：国家科技支撑计划项目(2006BAF04B10)

摘　　要：将激光—电弧复合热源焊接应用于铜与钢的熔—钎连接,用该焊接方法实现了T2紫铜合金板与镀锌钢板的优质连接。结果表明,焊接接头钢母材未发生熔化而铜合金母材熔化,其焊缝与钢母材为钎焊连接,拉伸试验中试样的断裂位置发生在焊缝铜母材热影响区,焊接热影响区略有软化。断口分析发现,接头的断裂属于塑性断裂。高倍电镜分析表明,焊缝钎焊连接界面处未见钢溶蚀及Cu沿铁素体晶界侵入现象;能谱分析结果表明,焊接接头中Cu,Fe原子分别向对方基体进行了良好的扩散,二者在钎焊连接界面处形成了Cu-Fe固溶体,并且在接头的钎焊连接界面处有Si元素的富集现象。Braze-welded joint between copper and steel could be achieved by laser-arc hybrid welding.With this method,high quality joining between T2 copper alloy sheet and galvanized steel sheet was successfully done.The results indicated that a brazed joint between copper and steel was formed,while the steel sheet in the joint was not melted.The tensile test shows that the crack initiated in the heat-affected zone of copper side,and the heat-affected zone is intenerated appreciably.Analysis of fracture appearance shows that the fracture characteristic of the joint is ductile fracture.The erodent structure of the steel and the penetration of copper atom through the crystal boundary of ferrite were not found by hish resolution electron micnoscope.Copper-iron solid solution formed around the brazing interfaces and both atoms diffused with each other.In addition,the brazing interface abounded with silicon.

关 键 词：激光 脉冲熔化极惰性气体保护电弧 复合热源 紫铜 钎接焊 

分 类 号：TG457[金属学及工艺—焊接]