【摘要】 对管道MIG焊双通道信号采集和特征分析做了初步研究.因管道其内部是一个相对狭小密闭的空间,回声的干扰相对较大,经过对采集的双通道电弧声信号进行ICA信号分离,对分离后的信号做小波降噪处理,信噪比得到明显提高.对降噪后的信号从时域、频域和时频域角度,综合分析管内和管外电弧声信号与焊缝熔透状态之间的内在相关性,发现电弧声信号能量及其频谱特性与熔透状态高度相关,焊接过程中信号能量幅值随熔透增大而增大,为后续利用电弧声信号来控制焊接质量提供了基础.更多还原

【Abstract】 Dual-channel signal acquisition and characteristic analysis was investigated in pipe MIG welding.Since the echo interference is relatively large in the closed space within pipe,the two-channel arc sound signals were studied with the independent component analysis(ICA).The ICA signals were de-noised with wavelet.The signal-to-noise ratio was obviously improved.The relationship between the arc sound signals inside and outside the pipe and weld penetration status was analyzed from time,frequency and time-frequency domain,respectively.The experimental results showed that the amplitude of signal energy was related to the weld penetration status.The signal energy increased with the increasing of weld penetration.The research in this paper provides technical basis for monitoring welding quality with arc signal.更多还原