【摘要】 构建了基于RS-485分布式单片机同步数据采集系统,所设计的电阻点焊电流、电压、电极位移和电极压力传感器满足点焊过程质量实时监测要求。研究发现:利用电极位移的极差和电极压力的极差可以判断铝合金脉冲点焊焊点未熔合或未完全熔合缺陷。当焊点出现内喷溅时,电极位移出现向下尖脉冲信号,电压信号出现"下榻"现象,电极压力产生高频脉冲信号,该脉冲幅值和持续时间与内喷溅严重程度相对应。利用以上特征信息可以实时监测焊点质量。更多还原

【Abstract】 Multiple-sensor synchronous data collection system was developed on the base of RS-485 distributed single-chip,and the sensors of resistance spot welding current,voltage,electrode displacement and electrode pressure applied to real-time monitor the spot welding process.The results show that the incomplete fusion defects of aluminum alloy pulse spot weld can be judged by the electrode displacement range and electrode pressure range.When the expulsion appeared in spot weld,the pulse of electrode displacement turned sharp down,and the voltage signal exhibited notching curve,and the electrode pressure signal exhibited high-frequency impulse.The impulse amplitude and duration were corresponding to the expulsion extent.Therefore,the quality of resistance spot welding can be judged by this characteristic information during the process of real-time monitor.更多还原