摘要
采用热补偿工艺垫片电阻点焊法对铝合金A5052与不锈钢SUS304异种材料进行了焊接.通过电子显微镜对接合界面区进行了观察,并分析了所生成反应物的微观结构及分布等组织特性.结果表明,一锯齿状反应层在接合界面生成,其主要由Fe2Al5和FeAl3组成;反应层厚度随焊接电流以及界面上位置的变化而变化.另外,在界面附近的铝合金内也观察到块状反应物生成,根据衍射斑点解析及成分分析结果得知这些块状反应物是晶格常数a=2.451 nm和c=0.758 nm六方结构的Al-Fe-Cr间非平衡相.
Aluminum alloy A5052 and stainless steel SUS304 were welded by resistance spot welding with a cover plate.The welding interface region of the joint was observed with electron microscopy,and the microstructure and distribution of the reaction products were analyzed as well.The results reveal that a serration reaction layer consisting of Fe2Al5 and FeAl3 forms in the welding interface and the reaction layer thickness varies with the welding current and the position at the welding interface.Moreover,the reaction blocks in aluminum alloy near the welding interface were observed,which were estimated as a hexagonal AlFeCr having a=2.451 nm and c=0.758 nm based on analysis of selected area electron diffraction patterns.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2011年第12期37-40,115,共4页
Transactions of The China Welding Institution
基金
河南省科技攻关项目(112102210176)
关键词
铝合金
不锈钢
电阻点焊
界面反应层
aluminum alloy
stainless steel
resistance spot welding
interface reaction layer
