空间曲线焊接温度及应力应变场数值模拟及应用研究

发布时间：2018-06-09 17:38

  本文选题：SYSWELD + 双椭球热源　； 参考：《新疆大学》2015年硕士论文

【摘要】：在现代工业生产中焊接技术被广泛应用,焊接过程中伴随着局部高温及不均匀受热,使焊接件在熔化和固态区域中产生残余应力及变形,严重影响其焊接质量和使用性能,因此掌握焊接中焊缝区域温度场的变化、焊接过程中残余应力的分布及应力引起的变形规律,在实际焊接质量尤为重要。本文采用有限元分析方法,基于SYSWELD软件平台,选取双椭球体热源模型,对焊接中温度场及应力应变场分布进行模拟仿真。首先对暖气管道运输中T形管焊接过程进行数值模拟,并结合现有实验设备,利用红外热成像仪对焊接过程中温度场分布进行实时检测,对检测结果进行数据处理,与分析结果进行对比验证;结合验证数据,对焊接过程进行优化处理,达到与实验相匹配的分析结果,使模拟分析过程在实际焊接中具有指导意义。在以上分析基础之上,对管道运输中弯管法兰焊接模拟仿真,得出焊接过程中最高温度在1630℃左右,与实验验证温度场分布相符;在300s时刻最大应力max??369.46MPa,在其抗拉强度490~675MPa范围之内;最大应变为max??0.32mm,但在弯管处出现整体偏移,偏移量为0.29mm,对其后续安装过程及焊接后工件的垂直度产生影响;因此,对装卡条件进行优化,在弯管处施加装卡条件阻止刚性体运动。重新对整体进行分析,得到整体最大应变max??0.29mm,在弯管端面处应变降到0.1mm左右,保证了弯管处尺寸要求,保障了后续安装的尺寸精度。此分析方法,有效地反应焊接过程中温度及应力应变场分布情况,可通过改变焊接路径和优化工艺参数等保证焊接质量,大大缩短了焊接实验周期、节约了实验成本,对管道安装中焊接过程起到指导意义。
[Abstract]:Welding technology is widely used in modern industrial production, and the welding process is accompanied by local high temperature and uneven heating, which results in residual stress and deformation in melting and solid region, which seriously affects the welding quality and performance. Therefore, it is very important to master the variation of temperature field in weld zone, the distribution of residual stress in welding process and the deformation law caused by stress, which is especially important in actual welding quality. In this paper, based on SYSWELD software platform and finite element analysis method, double ellipsoid heat source model is selected to simulate the distribution of temperature field and stress-strain field in welding. First of all, the welding process of T-tube in the transportation of heating pipe is numerically simulated, and the infrared thermal imager is used to detect the distribution of temperature field in the welding process, and the data of the test result is processed. The results are compared with the analysis results, and combined with the verification data, the welding process is optimized to achieve the analysis result matching with the experiment, which makes the simulation analysis process have the guiding significance in the actual welding. On the basis of the above analysis, the welding simulation of the elbow flange in pipeline transportation shows that the maximum temperature in the welding process is about 1630 鈩，

本文编号：2000564