摘要
铝合金电子束堆焊焊缝根部缩孔是一种特种焊接缺陷,它会导致应力集中诱发裂纹产生,显著降低焊件承载能力,必须给予足够重视.文中主要借助于ANSYS有限元软件的APDL二次开发编程语言,将匙孔模式焊接热源模型与枝晶间渗流理论和Niyama判据相结合,提出了一套基于温度场的凝固收缩判据程序,并应用它成功模拟预测了非熔透2219铝合金电子束堆焊件的根部缩孔缺陷.结果表明,通过模拟手段得到的缩孔缺陷沿焊缝熔深方向误差为8.76%,沿焊缝熔宽方向误差为13.28%,与试验对比件基本吻合,验证了缺陷判据程序的正确性和实用性.
Root shrinkage cavity in Al alloy electron beam welds is one special kind of welding defect,which results in stress concentration,induces the occurrence of crack and remarkablely decreases the carrying capacity,so it must be paid great attention. With the help of ANSYS APDL,by combining keyhole mode welding heat source model and interdendriticflowing theory as well as Niyama criterion,a set of defect criterion program based on temperature field was proposed to predict the root shrinkage cavity in 2219 Al alloy non-penetration electron beam overlaying weld. The results indicated that the simulated welding penetration has an error of 8. 76%,the erros of simulated welding width is 13. 28%,which werebasically in accordance with experimental samples. These results validated the exactness and feasibility of the defect criterion program developed in this paper.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2016年第3期75-78,132,共4页
Transactions of The China Welding Institution
关键词
电子束堆焊
热源模型
根部缩孔
判据程序
electron beam overlaying weld
heat source model
root shrinkage cavity
criterion program
作者简介
刘成财，男，1983年出生．博士研究生．主要从事电子束焊焊缝成形相关研究工作．发表论文4篇．Email：liuchengcai1983@163．com
