基于能量平衡短路过渡动态过程的仿真

通过焊接电源系统回路模型,考虑了焊丝端部的热焓变化,以及熔滴的能量平衡,提出并建立了较为精确的CO₂焊短路过渡动态过程仿真模型. 通过该模型探究了焊接参数匹配和不匹配时,电流信号波形变化趋势以及多个特征参数(均值电流、峰值电流、谷值电流、短路频率、短路时间和燃弧时间)与实际的对比情况,并进行了相关的特征参数误差分析. 结果表明,该模型基本能全面与实际相符合. 从而为短路过渡仿真建模在工程中的进一步应用奠定了理论基础.

A dynamic simulation model of short circuit transfer based on energy balance

By means of welding power system circuit model, thinking of the enthalpy changes on the wire tip, and energy balance on the droplet, the more precise CO₂ short circuit transfer dynamic simulation model is put forward. Through this model, it explores changing trend of current waveform, and makes a comparison of characteristic parameters (average current, peak current, valley current, short circuit frequency, short circuit time and arcing time) between the practical measurement and the simulation under matching and mismatching welding parameters. And the related deviations of the characteristic parameters are analyzed. The results indicate that the model is basically consistented with practice. At last, this research will contribute to further development of simulation in short circuit transfer process.