基于红外测温技术的焊接温度场数值仿真研究

Study on Numerical Simulation of Temperature Fields in Welding Process Based on Infrared Measuring Temperature Technique

焊接温度场数值模拟技术的出现,为焊接技术的深入发展创造了有力的条件,而这又有赖于温度测量技术作为试验验证手段。作为非接触测温的红外测温技术,能够真实地反映出焊件在焊接工艺中的温度随时间变化的热循环过程。本文针对低碳钢钨极氩弧焊接工艺,利用红外测温仪得到了多个测点的热循环曲线,以此来修正双椭圆分布热源模型参数,建立了该工艺的温度场有限元数值仿真模型,将有限元解同实验结果进行了比较,两者基本吻合,表明了该分析模型的有效性。

Appearance of numerical simulation technique of welding temperature fields creates favorable conditions for the development of welding technology, however, which is depended on the temperature measurement tool. The infrared measuring temperature technique as non-contact measuring temperature method can reflect the heat cycle process of the temperature change along with time of the weldment. In this paper, the heat cycle curves of various measuring points were obtained by using infrared measuring temperature instrument in accordance with low carbon steel in TIG welding. The double elliptic distribution model parameters of moving heat source were determined , and a three-dimensional non-linear FEM analysis model was established .It shows better fitness between the numerical solution and experiment results and effectiveness of the analysis model.