铝/镀锌钢复合热源熔—钎接头的局部“未钎合”缺陷分析  

Analysis for local incomplete brazing in fusion-brazed joints between aluminium and zinc-coated steel by 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10期37-40,44,共5页Transactions of The China Welding Institution

基　　金：国家"十一"五科技支撑计划资助项目(2006BAF04B10)

摘　　要：对铝/镀锌钢复合热源熔—钎连接过程中出现的局部"未钎合"缺陷的原因进行了研究,并制定了相应的抑制和消除缺陷的措施。结果表明,焊接热输入不足是导致铝母材熔合线根部位置产生局部"未钎合"缺陷的根本原因,而铝母材熔合线根部位置的熔池金属和钢板达不到Al-Si钎料与钢所需要的钎焊温度是产生局部"未钎合"缺陷的直接原因。局部"未钎合"缺陷的产生还与熔池的流动及母材金属的散热等因素有间接的关系。铝/钢熔—钎焊缝熔合线根部局部"未钎合"缺陷可以通过适当地增大焊接热输入及改变激光与电弧的空间位置以提高激光对钢母材的加热效果来抑制和消除。The cause of the local incomplete brazing at the root of the bond line of the fushion-brazed joint between aluminium and steel was studied,and the relevant measures were developed to restrain or avoid the defect. Analysis results showed that insufficient heat input is the essential cause to form the cocal incomplete brazing defect, and the temperature of the molten pool and the steel sheet at the the root of the bond line can not reach the critical brazing temperature to achieve a brazing joint using Al-Si brazing filler metal which is the direct reason of cocal incomplete srazing. Moreover the local incomplete brazing is indirectly influenced by the fluid flow of the molten pool and the heat dissipation of base metals. The local incomplete brazing defect can be restrained or avoided by increasing the heat input or adjusting the location of the laser spot and arc.

关 键 词：激光 脉冲MIG电弧 复合热源 熔—钎连接 局部“未钎合” 

分 类 号：TG457.14[金属学及工艺—焊接]