5A02铝合金与镀锌钢CO2激光熔-钎焊接工艺  

Fusion-brazing Welding for Dissimilar Metals Between 5A02 Aluminum Alloy and Zinc-coated Steel by CO_2 Laser

作　　者：樊丁[1,2] 张诗正[1] 余淑荣[1,2] 蒋锴[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,甘肃兰州730050

出　　处：《热加工工艺》2012年第11期140-142,共3页Hot Working Technology

摘　　要：利用激光熔-钎焊实现了5A02铝合金板和镀锌钢板的优质连接。对焊缝的金相分析表明,接头钢母材未发生熔化,钢一侧为钎焊,铝一侧为熔焊;对接头的组织和结构分析表明,在焊缝金属和镀锌板的界面区形成的金属间化合物,主要成分为Fe6AlSi、FeAl和FeAl3;拉伸试验表明,焊接接头的抗拉强度可达155.720 MPa,约为5A02铝合金母材抗拉强度的76.97%,试样断裂在铝合金母材热影响区,接头的断裂主要是塑性断裂,但有脆性断裂的痕迹。The aluminum and steel welding has become the hot and difficult problem in the field of welding.Aim at the technology characteristic,high quality fusion-brazing joining between 5A02 aluminum alloy and zinc-coated steel sheet,based on CO2 laser welding,is successfully done.From the metallic phases,the steel sheet under the seam is not melted,and brazing is located on the steel side and fusion welding on the aluminum side.The analysis on the microstructure of joint shows that a thin intermetallic compound layer is generated on the brazing interface.The main components in the layer are Fe6AlSi、FeAl and FeAl3.Tensile strength tests prove that the top tensile strength of the joint is 155.720 MPa,about 76.97% of that of the aluminum alloy base metal.The specimen fracture is in the heat-affected zone of aluminum aside.It can be sure that the main fracture form of the joint is ductile fracture,but has the trace of brittle fracture.

关 键 词：激光 铝钢焊接 熔-钎焊 

分 类 号：TG456.7[金属学及工艺—焊接]