摘要
文中提出了一种激光-TIG复合热源熔钎焊新方法，实现了铝合金与碳钢的对接熔钎焊，并研究了焊接工艺对接头特性的影响.采用扫描电镜（SEM）、能谱分析（EDS）和电子材料试验机对接头显微结构与力学性能进行研究.结果表明，接头最大抗拉强度为83.6 MPa，断裂发生在钢/焊缝界面，断裂形式为脆性断裂.钢/焊缝界面不同位置处界面层厚度不同，在3-12 μm之间.界面层由两部分组成，即靠近钢一侧为η-Fe2Al5，靠近焊缝一侧为τ5-Al7.2Fe2Si；远离界面层的焊缝区主要由α-Al基体和Al-Si共晶相组成.
A new method of laser-TIG hybrid welding-brazing of aluminum alloy/carbon steel was developed.The butt welding-brazing of aluminum alloy/carbon steel was realized,and the effects of welding parameters on joint characteristics were studied.Microstructures and mechanical properties of the joints were analyzed and tested by using scanning electron microscopy(SEM),energy dispersion spectrum(EDS) and electronic material testing machine.The results indicated that the maximum tensile strength of the joint reaches up to 83.6 MPa,the fracture occurred at the interface of steel/weld seam,the fracture model belongs to brittle fracture.The reaction layer hasheterogeneous thickness along steel/weld interface,its thickness is from 3 to 12 μm.The structures of the reaction layerare composed of η-Fe_2Al_5 close to steel side and τ5-Al_(7.2)Fe_2Si close to weld seam.The weld seam which is away from the interface layer consists ofα-Al matrix and Al-Si eutectic phases.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2016年第12期21-24,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51575040)
中央高校基本科研业务费专项资金资助项目(FRF-TP-15-004A3)
作者简介
李猛，男，1990年出生，硕士研究生．主要研究方向为钢／铝异种金属激光熔钎焊工艺与固／液界面反应机理．Email：menglee206@126．com
通讯作者：陈树海，男，副教授Email：shchenhit@gmail．com
