Real Time Optimization of Arc Welding by a Numerical Model

建立确定最佳工艺参数的数学方法是焊接工程中的重要问题之一。为了解决这一问题，在统计分析的基础上进行了许多尝试，以预测工艺变量对焊缝几何形状的影响，并提出了一些计算最佳工艺参数的经验公式。作为上述统计方法的一种替代方法，本文进行了可行性研究，以确定数值模型的计算机化方法是否可以用于估计弧焊的最佳工艺参数。该方法利用焊接熔池的数学模型，搜索电弧电流和焊接速度等最优工艺参数，并利用红外传感器检测到的温度对模型进行识别。所开发的薄板TIG电弧焊系统使工艺参数的实时优化成为可能。因此，基于焊接数值模拟的方法对优化电弧焊工艺参数具有指导意义。

One of the important problems in the welding engineering is to develop the mathematical method for the determination of optimum process parameters. In order to solve this problem, many attempts based on the statistical analysis have been made to predict the effect of the process variables on the weld geometries and some empirical formulas have been proposed to calculate the optimum process parameters.As an alternative to the above statistical method, in this work, a feasibility study has been performed to determine if the computerized method by the numerical model can be used to estimate the optimum process parameters in arc welding. In the method proposed, a mathematical model for the molten pool under welding is applied to search the optimum process parameters such as arc current and welding speed, and the temperatures detected by infrared sensors are used to identify the model. The developed system for a thin plate TIG arc welding made it possible to optimize the process parameters in real time.So, it is concluded that the method based on the numerical simulation of welding is a useful guide to optimum process parameters in arc welding.