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本文介绍和分析了用通常的单相交流点焊机焊接时电极间电压的波形特征及其影响因素;从理论上探讨了熔核形成,电极间电压极大值必须达到同材料本身的热物理性能、工件厚度以及焊接时间有关的临界值U_(mc);根据理论计算描绘了低碳钢点焊时的临界电压值U_(mc)与焊接时间t的关系曲线;焊点的抗剪强度同电极间电压极大值之间有一定的对应关系,但只是在U_(mc)附近强度值变化才大。电极间电压是一个综合参数,监测它即可监测焊接质量。
This paper introduces and analyzes the waveform characteristics of the voltage between electrodes and their influencing factors when welding with the usual single-phase AC spot welder; discusses the formation of nugget, the maximum voltage between the electrodes must reach the thermophysics of the same material itself Performance, workpiece thickness and the welding time of the critical value U_ (mc); according to the theoretical calculation of the low-carbon steel spot welding when the critical voltage value U_ (mc) and welding time t curve; solder joint shear strength with There is a certain correspondence between the maximum voltage between the electrodes, but only in the vicinity of U_ (mc) changes in intensity before they are large. The voltage across the electrodes is a composite parameter that can be monitored to monitor the quality of the weld.