输电线路塔脚不同焊接工艺方案分析与研究
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摘要
运用ANSYS建立了输电线路塔脚的有限元模型,提出了2种不同焊接工艺方案并模拟了其多层施焊焊接传热过程,提取塔脚主板中心底部到顶端的一条路径上的不同时刻温度梯度的分布并进行了对比分析。结果表明,采用相对焊缝多层焊道来回交替施焊的方式可以有效降低焊接过程中上述路径上的温度与温度梯度,从而有利于减小结构焊接变形和应力。研究结果可以作为后续热-力耦合分析的基础以及焊接工艺优化的指导。
The finite element model of tower foot of transmission line was established by ANSYS,two different welding processes were proposed and the heat transfer process of the multi-layer welding was simulated.A path at center of main ribs starting from the bottom to the top was chosen to analyze the temperature gradient distribution at different times and do comparative analysis.The results showed that relative welding bead,multiple welding,and symmetric and staggered welding can reduce the temperature and temperature gradient in the process of welding on the above path,which was able to reduce deformation and stress of tower foot structure.The simulation results can be used as a basis for subsequent thermalmechanical coupling analysis and as the guidance for welding process optimization.
The finite element model of tower foot of transmission line was established by ANSYS,two different welding processes were proposed and the heat transfer process of the multi-layer welding was simulated.A path at center of main ribs starting from the bottom to the top was chosen to analyze the temperature gradient distribution at different times and do comparative analysis.The results showed that relative welding bead,multiple welding,and symmetric and staggered welding can reduce the temperature and temperature gradient in the process of welding on the above path,which was able to reduce deformation and stress of tower foot structure.The simulation results can be used as a basis for subsequent thermalmechanical coupling analysis and as the guidance for welding process optimization.
引文
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[3]孟庆国,方洪渊,徐文立,等.考虑金属逐步填充的多道焊温度场数值模拟[J].焊接学报,2004,25(5):53-55.
[4]黎超文,王勇,韩涛.焊接顺序对T形接头残余应力和变形的影响[J].焊接学报2011,32(10):37-40,115.
[5]吴文烈,郑惠锦,刘鹏,等.输电线路铁塔塔脚机器人焊接工艺方法及性能[J].焊接,2015(9):41-44.
[6]冯悦峤.中厚钢板的深熔TIG焊工艺研究及温度场数值模拟[D].天津:天津大学,2016.
[7]贺鸿臻.热源模型对焊接数值模拟影响的研究[D].包头:内蒙古科技大学,2015.
[8]陈跃.地铁构架多道焊应力调控与焊接顺序优化方法研究[D].北京:北京交通大学,2014.