基于有限元的室外PE管道热熔焊接工艺优化

Optimization of hot melt welding process of PE pipeline based on finite element method

为解决聚乙烯管道热熔焊接因室内环境与现场施工环境不一致所带来的焊接质量问题,采用Ansys有限元方法,分析不同环境对温度均匀性、熔融层厚度的影响规律并进行焊接工艺评定,建立基于熔融层厚度的焊接工艺优化模型,最后辅以拉伸实验对优化后的焊接工艺参数进行验证。结果表明,在一定的环境条件下,随着轴向距离增加,管材温度逐渐趋于环境温度;随着冷却时间增加,焊接端面温度均匀性先下降后逐渐上升,且在200 s左右达到最低;熔融层厚度随着环境温度的降低和风速的增大而逐渐减小,且最多减小25%。优化后的试样拉伸强度与室内标准焊接工艺的拉伸强度相差在5%以内,符合标准焊接质量要求。

In order to address the welding quality issues caused by inconsistent indoor and on-site construction environment during the hot melt welding of polyethylene pipes,the finite element method in Ansys software was employed to analyze the influence of different environment on temperature uniformity and melt layer thickness,and to evaluate the welding process.Based on the melt layer thickness,an optimization model for the welding process was established and the optimized welding process parameters were validated through tensile experiments.The results showed that under certain environmental conditions,the pipe temperature gradually approached the ambient temperature as the axial distance increased.The uniformity of temperature at the welding end decreased first and then gradually increased with an increase in cooling time,reaching a minimum at around 200 seconds.The melt layer thickness gradually decreased with a decrease in environmental temperature and an increase in wind speed,with a maximum reduction of 25%.The difference between the tensile strength of the optimized sample and that of the indoor standard welding process was within 5%and met the standard welding quality requirements.