5A06铝合金/镀锌钢预置涂粉对接激光熔钎焊组织与性能  

5A06aluminum alloy and galvanized steel butt welding-brazing by laser with preset filler powder

作　　者：李春玲[1] 樊丁[1] 王斌[1] 余淑荣[1] 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050

出　　处：《吉林大学学报（工学版）》2016年第2期516-521,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51465031);兰州市科技局项目(2014-2-12)

摘　　要：通过预置金属粉末的方法实现了5A06铝合金/镀锌钢异种金属涂粉的对接熔钎焊连接,获得了具有熔焊和钎焊双重特征的对接接头。运用扫描电镜（SEM）、能谱仪（EDS）及X射线衍射仪（XRD）分析了接头微观结构和成分,并测试了接头力学性能。结果表明：界面处形成了厚度不均的锯齿状金属间化合物层,化合物层由Fe2Al5和FeAl3组成,厚度约2.5-7μm。在镀锌钢的上表面钎焊界面处,金属间化合物层最厚,其厚度随激光功率的增加而增大。采用预置金属粉末,在合适的焊接参数下,可以控制金属间化合物层厚度最大不超过10μm,得到具有一定抗拉强度的铝/镀锌钢对接接头。Laser welding-brazing of 5A06 aluminum alloy and galvanized steel sheet with filler powder was carried out.The obtained butt joint exhibited dual characteristics.The interfacial properties and microstructure of the joints examined using Scanning Electron Microscopy（SEM）,Energy Dispersive Spectrometer（EDS）and X-ray Diffraction（XRD）,and the tensile strength was measured.Results show that a non-uniform intermetallic compound（IMC）with serrated shape is formed at the interfacial layer,which is composed of Fe2Al5 and FeAl3.The thickness of the IMC layer varies from2.5 - 7μm,and it increases with the laser power.At the top surface of the galvanized steel the IMC layer reaches the thickest.Using this laser welding-brazing method with special filler powder,the IMC thickness can be controlled to less than 10μm,and butt joints with certain tensile strength can be obtained under appropriate welding parameters.

关 键 词：金属材料 铝/钢 激光熔钎焊 金属间化合物 力学性能 

分 类 号：TG456[金属学及工艺—焊接]