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为研究钢轨闪光对焊闪光阶段的温度场分布,建立了三维实体有限元模型.计算过程中考虑了温度对材料相变和热物理特性的影响,运用“生死”单元技术解决闪光时液体过梁爆破引起物质烧损的模拟问题,同时采用红外电视图像测温法实时测量闪光阶段温度场分布.结果表明,有限元分析结果与实验结果十分吻合,为选择和优化闪光焊焊接参数提供了重要的手段,为后续闪光焊过程顶锻阶段热力耦合过程的模拟奠定了基础.
In order to study the distribution of temperature field during the flash flash butt welding process, a three-dimensional solid finite element model was established, in which the influence of temperature on phase transformation and thermophysical properties was taken into account. The simulation of burnout caused by over-beam blasting is carried out, and the temperature field distribution of flash stage is measured in real time by the infrared image-based thermometry.The results show that the FEA results are in good agreement with the experimental results, which provide a good choice for the selection and optimization of flash welding parameters Important means for the follow-up during the flashover welding process of heat transfer coupled with the top of the simulation process laid the foundation.