摘要
以AZ31镁合金和5A06铝合金为研究对象,采用填充式摩擦点焊技术实现了镁/铝异种金属的有效连接,测试了不同旋转频率下摩擦点焊接头的剪切力,并观察和分析了旋转频率对焊点形貌、界面组织以及元素分布的影响规律.结果表明,随着焊接工具旋转频率的增加,焊点的剪切力先增加后减小,且在2 400 r/min附近有最高的剪切力,约为1.9 kN.当旋转频率较低时,镁/铝之间界面反应不充分,无明显的界面层组织,甚至存在"未焊合"区.当旋转频率较高时,镁/铝间形成的界面层较厚(约5μm),界面组织明显,界面结合良好.
AZ31 Mg alloy and 5A06 Al alloy were welded successfully with refill friction spot welding process. The shear stress of the spot joint with different tool rotation frequencies was tested. The effect of rotation frequency on the cross-section,interface layer and element distribution was analyzed. With the increase of the tool rotation speed,the shear stress of the joints increases firstly and then decreases. In particular,when the rotation speed is 2 400 r / min,the average shear stress can reach a maximum of 1. 9 kN. When the rotation frequency is lower,the interface layer of Mg / Al is thiner. Due to the insufficient interface reaction,the phenomenon of incomplete fusion appears. If the rotation frequency is higher,the interface layer of Mg / Al is thicker( about 5 μm). The interface bonding is very good.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2013年第11期9-12,113,共4页
Transactions of The China Welding Institution
基金
国防基础科研资助项目(A0320110014)
关键词
填充式摩擦点焊
异种金属
旋转频率
界面层
力学性能
refill friction spot welding
dissimilar metals
rotation frequency
interface layer
mechanical properties
