Real Time Optimization of Arc Welding by a Numerical Model

焊接工程中的一个重要问题是发展确定最佳工艺参数的数学方法。为了解决这一问题，人们进行了许多基于统计分析的尝试来预测工艺参数对焊缝几何形状的影响，并提出了一些经验公式来计算最佳工艺参数。已经进行了可行性研究以确定通过数值模型的计算机化方法是否可以用于估计电弧焊接中的最佳工艺参数。该方法利用焊接过程中熔池的数学模型来搜索最佳的焊接工艺参数，如电弧电流和焊接速度，并利用红外传感器检测的温度来识别模型。该系统为薄板TIG焊工艺参数的真实的实时优化提供了可能，说明基于焊接数值模拟的方法对焊接工艺参数的优化具有指导意义。

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.