基于计算机模拟分析的钛合金激光焊接过程中金属流动性  

Metal liquidity of titanium alloy in the process of laser welding based on computer simulation analysis

作　　者：田润芙[1] 杨旭 

机构地区：[1]张家口职业技术学院,河北张家口075051 [2]宣化县交通运输局,河北宣化075000

出　　处：《电焊机》2015年第7期92-96,共5页Electric Welding Machine

摘　　要：利用计算机建立用于模拟钛合金全焊透激光焊接中金属流动的数学模型。本模型中,考虑到等离子体效应和小孔吸收效应,热源包括在上表面的平面热源和沿z轴方向的圆柱形热源。通过求解能量、动量和质量守恒方程可以获得温度场和流场。使用带松弛参数的动量插值方案能够简化计算算法,同时减小计算机的存储空间。引入模糊区域,提供了一种简单的方法来处理压力和速度边界条件。利用建立的模型对焊缝几何尺寸的计算结果与实验结果吻合较好。研究结果表明,金属的流动是形成典型"沙漏"状横截面轮廓的主要原因。Set up a mathematical model to simulate metal flow of full penetration laser welding of titanium alloy.ln this model, considering the effect of the plasma and the keyhole absorption, and the heat source is included in the surface plane heat source and cylindrical heat source along the z axis direction. By solving the energy,momentum and mass conservation equation can obtain the temperature field and flow field. In order to simplify the calculation algorithm, can use the momentum interpolation scheme with under-relaxation parameters,and it also can reduce the storage space of computer. Introducing mushy region,it can provide a simple method to deal with the pressure and velocity boundary conditions. The calculated results indicate the metal flow is the main reason for forming the typical ＂hourglass＂ cross-section profile.

关 键 词：激光焊接 钛合金 流场 动量插值 模拟 

分 类 号：TG456.7[金属学及工艺—焊接]