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介绍子波变换及离散二进子波变换，分析快速子波变换——Ｍａｌａｔ算法，并阐述了利用子波变换模极大值检测信号奇异性方法的原理，给出了应用该方法提取ＣＯ２气体保护薄壁（板）焊工件焊穿信息特征的成功应用实例，说明这种方法能够有效地应用于焊接过程质量监控的信号处理。
This paper introduces the wavelet transform and discrete binary wavelet transform, analyzes the fast wavelet transform - Maalat algorithm, and expounds the principle of using the wavelet transform modulus maxima to detect the signal singularity. The method to extract CO2 gas The successful application examples of the protection of welding information of thin-walled (plate) welding workpieces show that this method can be effectively applied to the signal processing of welding process quality monitoring.