Application of short time energy analysis in monitoring the stability of arc sound signal

This paper employed the short time energy of arc sound signals to online quantitatively describe the stability of arc sound signal. At first, the signal can be preprocessed by wavelet packet filtering, and then detailed information of the short time energy of the signal was obtained using hamming window. After statistical analyzed the short time energy, the energy distribution possibility and cumulative distribution function of the signal can be collected. Then a proposed stability evaluation criterion was employed to quantitatively describe the stability of arc sound signal. Relative experimental data showed that more stable signal corresponded lager value of the criterion. The proposed method which combined the short time energy and statistical analysis was supported by many actual experiments. This contribution can benefit the quantitative evaluation of the arc welding process, and instructed the future parameters optimization to obtain welding products with high quality.