摘要
借助有限元分析手段对不同点固焊形式的对接焊焊接过程进行模拟,经分析得到焊接变形和应力分布情况,采用实验手段验证试验结果。结果表明,点固焊位置相同,长度越长,获得的变形量越小;起、收弧的两端面点固焊变形在起、收弧两侧翘起,焊缝位置点固焊翘起的位置发生在与焊缝位置平行的两侧自由端;点固焊长度越长,仿真和实测结果的残余应力分布波动性越大;在起、收弧两端面点固焊获得的残余应力峰值最小;起、收弧两端面点固焊、点固焊2处残余应力值均降低,点固焊3处残余应力值增大。证明了有限元模型的正确性和有效性。
By means of finite element analysis, the deformation and stress distribution of butt-welding in different tack welding forms are obtained. The experimental results are verified. The results show that the length of tack welding in the same position is longer, deformation is correspondingly smaller. Welding deformation that tack welding is defined in arc building and extinction is upturned on both sides of arc building and extinction. Both sides of free edges that tack welding is defined in weld seam are upturned parallel with weld seam. Tack welding length is longer, while volatility of residual stress distribution is bigger. Residual stress peak that tack welding is defined in arc building and extinction is minimum. Residual stresses in the position of tack welding and that of arc building and extinction are decreased. Residual stress value of three tack welding positions increases. It proves the validity and effectiveness of the finite element model.
出处
《电焊机》
2016年第9期92-96,共5页
Electric Welding Machine
基金
江苏省自然科学基金项目(BK20140229)
关键词
点固焊形式
焊接变形
残余应力
实验手段
tack welding
welding deformation
residual stress distribution
experimental method
