Coupled Computational Fluid Dynamic and Finite Element Multiphase Modeling of Laser Weld Bead Geometry Formation and Joint Strengths
Coupled Computational Fluid Dynamic and Finite Element Multiphase Modeling of Laser Weld Bead Geometry Formation and Joint Strengths
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DOI：
10.1115/1.4023240
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发表时间：
2013-02
影响因子：
4
通讯作者：
S. Marimuthu;R. M. Eghlio;A. Pinkerton;Lin Li
中科院分区：
文献类型：
--
作者：
S. Marimuthu;R. M. Eghlio;A. Pinkerton;Lin Li
激光焊接在工业中广泛用于在组件和结构的组装中接合各种材料。局部熔化后快速冷却导致焊缝的形成和残余应力的产生。选择适当的输入参数组合并了解其效果对于实现所需的焊接质量和光滑的焊接表面非常重要。在目前的工作中，顺序耦合的热结构多相分析进行了预测的激光参数的焊缝的表面拓扑结构的变化和随后的结构性能的影响的目标。研究表明，激光焊接工艺参数对焊缝形状有很大影响，最终影响焊缝质量。网状焊道在应力分布和变形方面比其他焊道形状表现出更好的性能。数值模拟结果进行了比较与低碳钢板上使用光纤激光器进行的实验观察，结果是在焊缝横截面轮廓和强度方面的良好协议。
Laser welding is used extensively in industry for joining various materials in the assembly of components and structures. Localized melting followed by rapid cooling results in the formation of a weld bead and generation of residual stress. Selection of the appropriate combination of input parameters and understanding their effects is important to achieve the required weld quality with a smooth welding surface. In the present work, a sequentially coupled thermo-structural multiphase analysis was carried out with the objectives of predicting the effect of laser parameters on the change in surface topology of the weld bead and its subsequent effect on structural properties. The work shows that the laser welding parameters strongly affect the weld bead shape, which eventually affects the weld quality. A net shaped weld bead demonstrates better performance in terms of stress distribution and distortion than other weld bead shapes. The numerical simulation results were compared with the experimental observations performed on a mild steel sheet using a fibre laser and the results are in good agreement in terms of weld bead cross-sectional profile and strength.