中文摘要：

为明晰焊管内高压成形焊缝的合理有限元建模方式，针对激光焊接接头的材料性能分布特点提出三种焊缝建模方式，分别为完整焊缝模型、粗略焊缝模型和无焊缝模型。通过与试验结果对比，从壁厚分布和几何形状两方面，分析不同焊缝简化方式对送料区、过渡区和胀形区模拟精度的影响情况。指出焊缝对模拟精度有影响，受影响区域不超过3倍焊缝宽度。只有建立焊缝模型才能模拟出靠近焊缝部位壁厚过渡减薄的变形特征，但建立完整焊缝模型和建立粗略焊缝模型的模拟精度相差不大，最大误差均小于6．5％。在综合考虑误差大小和典型变形特征模拟准确性后，给出适合激光焊管内高压成形的焊缝有限元建模方式。

英文摘要：

To evaluate a suitable modeling method for tailor welded tube hydroforming, three styles of weld-seam model, i.e., comprehensive model, rough model and no weldseam model, are put forward and studied according to laser welding joint material properties. By comparing with experimental results, effects of modeling styles on simulation precision, such as thickness distribution and geometry shape, are analyzed. It indicates that weldseam is a key factor to affect simulation precision. But affected zone is limited to three times of weldseam width. Over thinning deformation character can be simulated successfully only when weldseam model is built. It is worthwhile to note that little deference happens between comprehensive and rough models in simulation precision. The maximal error of simulation results are both less than 6.5%. At last, the suitable weld-seam modeling is given by comparing thickness and shape simulation accuracy, which is useful for further analysis of laser tailor-welded tube hydroforming.