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本文采用特殊的恒压焊接电源,建立了一套微计算机控制的实验装置。在TIG 固定点弧焊情况下,通过在正常焊接电流的基础上,每隔一定时间施加一瞬闻激振脉冲电流来激励焊接熔池产生振荡,然后检测电弧电压,以获得激振脉冲过后的焊接熔池振荡信号的方法,对实时测定焊接熔深作了初步探索。在对信号分析的基础上,研究了焊接熔池振荡频率与焊接熔深之间的关系,并建立了相应的数学模型——焊接熔池波动方程。利用有限差分法求解了焊接熔池波动系统的特征值问题,得到了焊接熔池振荡频率与焊接熔深之间关系的数值解.1Cr18Ni9Ti、20~3、16Mn 三种不同材料的实验结果与理论计算结果的吻合程度良好。
In this paper, a special constant voltage welding power supply, set up a set of micro-computer control experimental device. In the case of TIG fixed-point arc welding, an instantaneous excitation pulse current is applied at regular intervals based on the normal welding current to excite the welding pool to oscillate, and then the arc voltage is detected to obtain the welding after the excitation pulse The method of oscillating signal in molten pool is a preliminary exploration of the real-time measurement of weld penetration. Based on the signal analysis, the relationship between the welding pool oscillation frequency and the weld penetration is studied, and the corresponding mathematical model - the wave equation of weld pool is established. The finite difference method is used to solve the eigenvalue problem of the welding pool fluctuation system, and the numerical solution of the relationship between the welding pool oscillation frequency and the welding penetration depth is obtained. The experimental results and the theory of three different materials, Cr18Ni9Ti, 20 ~ 3 and 16Mn The calculated results are in good agreement.