作　　者： ; ; ;

机构地区： 天津科技大学机械工程学院

出　　处： 《焊接学报》 2007年第7期33-36,共4页

摘　　要： 采用分布式多传感器同步采集系统实现了铝合金点焊质量实时监测。通过位移信号时频域分析发现,喷溅焊点位移信号在40～80Hz范围内,Butterworth带通滤波极差达0.5mm左右;未熔合或未完全熔合焊点的位移信号极差比另外两类焊点低1.0mm左右。利用上述明显特征信息可以实现点焊质量人工判定。由于位移信号信噪比高,特征提取算法简洁,进一步可实现机器在线判读。同时,利用统计分析,样本197个,在合格区内焊点正确判断率达97.6%。 Resistance spot welding quality real-time monitoring of aluminum alloy was realized by distributed multiple-sensor synchronous collection system. Displacement signal time-frequency domain analysis shows that Butterworth band-pass filter range of the expulsion welding spot electrode displacement signal can reach about 0.5 mm between 40-80 Hz. The electrode displacement signal range of the undersize welding spots is lower about 1.0 mm than other two kinds of welding spots, so that using the explicit characteristic information can implement at resistance spot welding quality judgment by man and further can finish quality judgment by machine using the high signal-to-noise displacement signal and the brevity characteristic extracting method. At the same time, statistic analysis of 197 samples indicates that the percentage of accuracy can reach 97.6% at the acceptable welding spots zone.

关 键 词： 电阻点焊 铝合金 位移信号 时频域分析 质量判定

领　　域： [金属学及工艺]