摘要
采用4种冷金属过渡焊接工艺(CMT)分别在不同热输入水平下,使用ER2319焊丝进行AA2219-T851高强铝合金的平板堆焊成形,全面分析其焊缝成形和气孔分布特征。结果表明,常规CMT焊缝具有明显指状熔深特征,气孔缺陷严重并呈全焊缝分布状态;CMT-P焊缝母材熔化面积明显增大,气孔数量显著减少且在适当控制热输入时有助于消除气孔;CMT-ADV焊缝也具有指状熔深特征但熔深显著减小;CMT-PADV焊缝具有显著球形熔滴成形特征且熔深最小,两工艺低热输入和对焊丝表面氧化膜的清理作用有助于消除气孔。
The weld bead geometry and the porosity of AA2219-T851 high strength aluminum alloy welds with ER2319 wire produced by different cold metal transfer（CMT）processes and heat inputs were investigated.The results show that a narrow finger-shaped geometry is observed using the conventional CMT process and a large number of gas pores exist in the lower and upper parts of welds.Compared to results of above mentioned CMT process,the weld melting area is increased using CMT-pulse（CMT-P）process,and it is beneficial to reduce the porosity effectively with an appropriate heat input.The finger-shaped geometry with lower melting depth using CMT-advanced（CMT-ADV）process and the spherical-shaped bead geometry with lower dilution using CMT-pulse advanced（CMT-PADV）process are achieved.The gas pore is reduced predominantly and even eliminated due to the lower heat input and the effective oxide cleanliness of wire ends for the two processes.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第3期606-611,共6页
Rare Metal Materials and Engineering
基金
Fundamental Research Funds for the Central Universities(YWF-12-LGJC-001)
关键词
铝合金
冷金属过渡
热输入
焊缝成形
气孔
aluminum alloy
cold metal transfer
heat input
weld bead geometry
porosity
作者简介
从保强，男，1979年生，博士，副教授，北京航空航天大学机械工程及自动化学院，北京100191，电话：010-82339961，E-mail：congbq．buaa@gmail．com
