洛伦兹力计算及其对GMAW焊接模拟的影响
Lorentz force solution and its influence on GMAW welding simulation
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摘要: 运用两种方法给出洛伦兹力求解的完备公式，并通过数值仿真验证.详细推导了洛伦兹力的两种求解过程，采用ANSYS软件分别对熔滴过渡和电弧作了数值模拟，对洛伦兹力分布图、熔滴过渡和电弧形态作了详细比较，分析动量源项对焊接仿真结果的影响.结果表明，与直接进行积分求解的近似方法相比，引入磁矢量的间接计算法对焊接数值模拟效果较好，洛伦兹力分布更接近于理论分析；未添加洛伦兹力源项的计算电弧没有被有效的压缩，熔滴也没有缩颈；间接法有更广的适用范围.Abstract: Lorentz force formula was obtained using two methods, and verified by the welding simulation. Two kinds of methods to solve the Lorentz force were deduced in detail, and numerical simulation of droplet transition and arc characteristics were conducted by ANSYS software. Additionally, distribution of radial Lorentz force, images of droplet transformation and isotherm of welding arc were analyzed by comparing the simulation results. Results show that the indirect method has much better effects on results of the numerical simulation, and the distribution of Lorentz force is more close to the theoretical analysis owing to the magnetic vector analysis compared to the direct integral method. The calculated arc has not been compressed effectively, and the neck of droplet has not been also shrunk without Lorenz force source terms. Furthermore, the indirect method has a wider application prospect.
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Keywords:
- welding simulation /
- Lorentz force /
- tip effect /
- droplet /
- arc
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