摘要
采用AlCu焊丝对铝/钢异种金属进行激光-CMT复合熔钎焊试验,系统研究复合焊接工艺参数对焊缝成形的影响规律,分析接头的硬度分布、微观结构及拉伸性能。研究结果表明:提高激光功率、增大送丝速度或降低焊接速度均可以提高铝在钢侧的润湿铺展效果,获得了优化的复合焊接工艺参数:激光功率2100 W、送丝速度4.0 m/min和焊接速度1.0 m/min。铝/钢界面金属间化合物呈现双层结构,靠近钢侧为板条状,靠近铝侧为针尖状,在最佳复合焊接工艺参数下的金属间化合物层厚度约为2.1μm,相组成为Fe_(4)Al_(13)、Fe_(2)Al_(5)、FeAl_(3)和Al_(2)Cu。接头的平均抗拉强度约为164.9 MPa,可以达到铝合金母材的67.3%,断裂方式为穿晶断裂和沿晶断裂的混合断裂模式。
Laser-CMT hybrid welding-brazing experiments were carried out on Al/steel dissimilar metals using AlCu filler wire in this work.The effects of welding parameters on the weld formation were systematically studied,and the hardness distribution,microstructure and tensile properties of the joints were also researched.The results indicated that increasing laser power,increasing wire feeding speed or reducing welding speed could improve the wetting and spreading of aluminum on the steel side,and the optimized welding parameters were obtained:laser power 2100 W,wire feeding speed 4.0 m/min,and welding speed 1.0 m/min.The intermetallic compounds showed a double-layered structure,with lath-shaped near the steel side and needle-tip-shaped near the aluminum side.The thickness of the intermetallic compounds layer was about 2.1μm under the optimized welding parameters,and the phase compositions of the intermetallic compounds were Fe_(4)Al_(13),Fe_(2)Al_(5),FeAl_(3),and Al_(2)Cu.The average tensile strength of the joints was 164.9 MPa,which was 67.3%of the aluminum alloy,and the fracture mode was transgranular and intergranular mixed fracture.
作者
赵昕
吕萃萃
陈禹昕
辛志彬
杨志斌
Zhao Xin;Lü Cuicui;Chen Yuxin;Xin Zhibin;Yang Zhibin(School of Mechanical Engineering,Dalian University of Science and Technology,Dalian,Liaoning 116052,China;Art Design College,Dalian Art College,DalianLiaoning 116600,China;School of Materials Science and Engineering,Dalian Jiaotong University,Dalian f Liaoning 116028,China)
出处
《应用激光》
CSCD
北大核心
2022年第3期1-7,共7页
Applied Laser
基金
辽宁省教育厅青年科技人才“育苗”项目(L2019008)
辽宁省教育厅科学研究经费项目(JDL2020026)。
关键词
铝/钢异种金属
激光-CMT复合熔钎焊
金属间化合物
拉伸性能
aluminium/steel dissimilar metal
laser-CMT hybrid welding-brazing
intermetallic compound
tensile property
