摘要
研究旋压封头坯料双面多道次拼焊过程残余应力分布规律。对封头材料Q345R进行焊接工艺和材料性能分析,然后使用SYSWELD软件对封头坯料多道次拼焊焊接工艺过程进行数值模拟。根据焊接模拟结果对封头坯料拼焊过程中的温度场、焊接变形和焊接残余应力分布进行分析,并给出上下表面横向残余应力和纵向残余应力以及厚度方向残余应力的分布曲线。研究表明,Q345R封头坯料焊接之后,焊接残余应力分布较复杂,残余应力偏高,尤其焊缝区内部存在高残余应力区。高残余应力易使坯料在后续旋压过程中产生开裂缺陷。根据模拟结果制定合理的消除残余应力热处理工艺,并通过试验验证仿真结果的有效性和可靠性。该研究方法为实现大型封头焊接质量预测和控制,以及类似产品的加工工艺制定提供有效手段。
Residual stress distribution of double-sided multi-pass welding in the course of spinning heads welding is studied. The welding process and material property of Q345R material for heads blank is analyzed. And then the multi-pass welding process of the blank is simulated with SYSWELD software. According to the welding simulation, the temperature field, welding deformation and welding residual stress are analyzed. Then, distribution curves of transverse residual stress and longitudinal residual stress on the top and the bottom surface, and along the thick direction are given. It indicates that the distributions of the welding residual stress are complicated, while the residual stress values especially in the weld zone are too large after the Q345R blank welding. The high residual stress in the weld zone can cause cracks in followed spinning process. According to the simulation results, a reasonable heat-treatment process is considered and implemented to relief the residual stress. The experiments of blank welding and spinning verified that the simulation results are valid and reliable. The research method provides an effective measure for the forecast and control of the large heads multi-pass welding and the determination of the manufacturing process of similar products.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第10期127-133,共7页
Journal of Mechanical Engineering
关键词
封头坯料
多道焊
残余应力
数值模拟
Blank of heads Multi-pass welding Residual stress Numerical simulation
