摘要
采用经积分镜整形为矩形的光纤激光光斑,对AA6061/镀锌钢异种金属接头进行了激光填充粉末熔钎焊连接,并分析了接头连接界面的显微组织及其对接头力学性能的影响.结果表明,选择优化的焊接参数,获得了成形饱满、无裂纹气孔等缺陷的焊缝;熔钎焊接头的金属间化合物组织由层状和枝晶状两部分组成.层状金属间化合物组织由Fe2Al5组成,枝晶状金属间化合物组织由τ1(Al2Fe3Si3)和Fe4Al13组成;拉伸试样均断裂在钎料/镀锌钢界面,断口呈脆性断裂特征.接头机械抗力水平由连接界面宽度与金属间化合物层最大厚度的比值决定.
Fluxless fiber laser fusion welding-brazing with rectangular spot was used to produce joints between 6061-T6 aluminum alloy and galvanized steel with filler powder.The joints were evaluated by metallurgical analysis and mechanical properties testing.The results indicated that favorable joint with good figuration,no crack and pore were present with optimized welding parameters.Furthermore,the joint was characterized by layered and dendritic microstructure.The layered structure is composed of Fe2 Al5.The dendritic part is identified as τ1 and Fe4 Al13 phases.In addition,failures were observed in the weld / steel interface with brittle characteristics from the tensile test.The mechanical resistance of the joint is determined by the ratio of width of weld interface and the maximum thickness of intermetallic compounds layer.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2013年第5期41-44,115,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(50875005)
北京市自然科学基金资助项目(3102005)
关键词
异种金属
熔钎焊接
填充粉末
显微组织
力学性能
dissimilar alloys
fusion welding-brazing
filler powder
microstructure
mechanical properties
