摘要
为明确铝/钢电磁脉冲焊接过程金属粒子运动对界面连接性能的影响,基于金属粒子流形成机理,对界面形貌及抗剪强度进行分析.结果表明,金属粒子滞留界面造成铝局部熔化,钢粒子原位生成FeAl,形成未结合区;沿着焊接方向,分射流对铝板压入作用逐渐增大,形成冶金结合的界面,并伴有富铝金属间相,直缝区为FeAl+Fe_(2)Al_(5),小波区为Fe_(2)Al_(5)+FeAl_(3),大波区为FeAl+FeAl_(3);铝钢焊接界面过渡区由塑变铝压入钢形成,铝侧焊缝的外边缘存在钢粒子,而钢侧焊缝存在熔融铝携带钢粒子,主要为FeAl+Fe_(2)Al_(5)+FeAl_(3),且在焊缝内侧滞留了大量金属粒子,并以椭圆环的形式分布,在焊缝外侧,金属粒子滞落铝板表面造成凹坑,但在钢板表面为嵌入的片状铝;因此,在金属粒子滞留,并产生较多金属间化合物的位置成为剪切试验断裂源;通过波长公式调整搭接间隙,减少粒子滞留界面,椭圆焊缝断裂于铝材,提高了接头强度.创新点:基于金属粒子流形成机理,控制IMCs组织,微调铝钢界面波形以减少滞留粒子,提高接头强度.
In order to investigate the effect of metal particle movement on interface connection performance in electromagnetic pulse welding of aluminum to steel,based on the formation mechanism of metal particles,the interfacial structure and tensile shear strength were analyzed.The results showed that metal particle entrapment at the interface caused local melting of aluminum.Steel particles generated in situ FeAl,forming an unbonded zone.Along the welding direction,the impact effect of the separate jet on the aluminum plate gradually increased,forming a metallurgical bond,accompanied by aluminum-rich intermetallic phases.FeAl+Fe_(2)Al_(5) existed in the straight seam.Fe_(2)Al_(5)+FeAl_(3) existed in the corrugated zone.FeAl+FeAl_(3) existed in the large corrugated zone.The transition zone of the welding interface was formed by plastic deformation of aluminum pressed into the steel.There were steel particles on the outer side of the aluminum plate weld,while there were molten aluminum carrying steel particles at the steel plate weld,mainly composed of FeAl+Fe_(2)Al_(5)+FeAl_(3).A large number of metal particles gathered on the inner side of the weld and were distributed in the form of elliptical rings.Metal particles remained on the surface of the aluminum plate,causing pits,but there were embedded sheets of aluminum on the surface of the steel plate.Therefore,locations where metal particles were trapped and more intermetallic compounds were produced became shear fracture sources.The wavelength formula was used to adjust the lap gap to reduce particle entrapment,breaking the elliptic weld at the aluminum,and improving joint strength.Highlights:Based on the formation mechanism of metal particle flow,the waveform of interface of aluminum/steel was fine-tuned to reduce the detention metal particles,and control the IMCs structure,thus improving the welded joint strength.
作者
迟露鑫
黄岩
许惠斌
顾凌翔
张玉虎
冉洋
吴江川
CHI Luxin;HUANG Yan;XU Huibin;GU Lingxiang;ZHANG Yuhu;RAN Yang;WU Jiangchuan(Chongqing University of Technology,Chongqing,400054,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,150001,China;Chongqing Pulsa Technology Co.,Ltd.,Chongqing,400054,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2023年第5期36-43,I0005,共9页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51805065)
重庆市科委自然科学基金项目(cstc2020jcyj-msxmX0574)
先进焊接与连接国家重点实验室开放课题研究资助(AWJ-19M02)
重庆理工大学国家自然科学基金项目培育计划(2022PYZ013)
重庆理工大学研究生科研创新项目资助(clgycx20203015)
重庆理工大学大学生创新创业训练计划(2022CX175).
关键词
铝/钢
电磁脉冲焊接
金属粒子
金属间化合物
连接机理
aluminum/steel
electromagnetic pulse welding
metal particles
intermetallic compounds
bounding mechanism
