大型复杂结构件高效焊接热源

发布时间：2018-01-17 03:17

本文关键词：大型复杂结构件高效焊接热源　出处：《焊接学报》2015年10期 　论文类型：期刊论文

【摘要】：文中基于分段化思想,建立了以焊缝等效温度为控制参数的分段移动温控型体热源模型,并利用Q345B平板对接焊模型对其进行模拟验证.同时以计算时间、计算精度为基准,基于不同网格尺寸,对分段移动温控型热源、逐点移动双椭球体热源、分段移动双椭球体热源三种热源模型的计算效率进行对比分析.结果表明,文中提出的分段移动温控型体热源模型所获得的残余应力和变形与逐点移动双椭球体热源模拟结果趋势一致,其计算精度与分段移动双椭球体热源相当,但计算效率更高,在复杂结构件上的使用效果更突出.
[Abstract]:Based on the idea of segmenting, a piecewise moving thermal-controlled body heat source model with weld equivalent temperature as the control parameter is established in this paper. The Q345B plate butt welding model is used to simulate and verify it. Meanwhile, based on the calculation time and accuracy, and based on the different mesh size, the temperature controlled heat source is moved. The computational efficiency of the three heat source models of moving the double ellipsoid heat source point by point and moving the double ellipsoid heat source is compared and analyzed. The residual stress and deformation obtained by the proposed piecewise moving thermal-controlled body heat source model are consistent with the simulation results of point-by-point moving double ellipsoid heat source, and the calculation accuracy is equivalent to that of piecewise moving double ellipsoid heat source. But the efficiency of calculation is higher, and the effect of using on complex structure is more prominent.
【作者单位】：西安建筑科技大学机电工程学院;中联重科股份有限公司渭南分公司;
【基金】：中联重科产学研重点资助项目
【分类号】：TG402
【正文快照】： 0序言通过数值模拟准确推断焊接过程的动力学行为,特别是焊后残余应力和变形是焊接力学中的一个关键课题.对大型复杂结构件而言,由于其几何尺寸较大,以及焊接温度场的严重不均匀性,导致模拟过程中计算量庞大、计算效率低[1].因此如何提高大型复杂结构件焊接数值计算效率在实际

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