| 摘要: |
| 建立了复合热源作用下的激光穿透焊接熔池流动三维计算模型,热源由作用在激光表面的高斯热源以及沿激光入射方向的柱状热源组成,分别考虑了等离子体和小孔吸收机制。通过添加源项的办法解决了过渡区相变问题,从而将固态区和液态区组合一起求解,简化了固液边界条件的处理难度。通过TC1钛合金激光焊接试验验证了模型的正确性,计算所得的熔池截面与试验结果吻合良好。结果表明,Marangoni对流是形成激光穿透焊"沙漏"状熔池形貌的主要原因。 |
| 关键词: 激光焊接 温度场 流动场 数值模拟 |
| DOI： |
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| Simulation of the temperature field and flow field in full penetration laser welding |
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DU Han-bin,HU Lun-ji,WANG Dong-cuan,SUN Cheng-zhi
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School of Materials Sci. & Eng, Huazhong University of Science and Technology, Wuhan 430074, China
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| Abstract: |
| A three-dimensional mathematical model for the temperature field and flow field in full penetration laser welding of titanium alloy was presented. In this model, the heat source comprises a plane heat source on the top surface and a cylindrical heat source along the z-direction, which takes into account the plasma effect and the keyhole absorption. The mushy region is introduced to provide a simple method to dispose of the pressure and velocity boundary conditions. Calculated results from the models are found to agree with the experimental results for the geometry profile of weld. The metal flow is the main cause for forming the typical "hourglass" cross-section profile. |
| Key words: laser welding temperature field flow field mathematical simulation |
