Time-Domain Characteristics Analysis of Penetration Arc Sound Signal in MIG Welding
Many important time-domain characteristic parameters are extracted through the short-time analysis of arc sound signal in MIG butt welding with spray transfer, which can be used for the diagnosis on the weld penetration status. And the short-time autocorrelation function and short-time average amplitude difference function are adopted to pitch estimation. The analysis results show that the penetration status can be accurately recognized via the short-time energy, average magnitude, average zero-crossing and zero-to-energy and so on. Meanwhile, the pitch estimation of arc sound signal in experiments is at 220 points, that is 5 ms or 200 Hz in cycle. The methods and results provide a foundation for the diagnosis on penetration based on analysis of arc sound signal and have great theoretical meaning and practical value.
Zhengyi Jiang, Xianghua Liu and Jinglong Bu
L. J. Liu et al., "Time-Domain Characteristics Analysis of Penetration Arc Sound Signal in MIG Welding", Advanced Materials Research, Vols. 154-155, pp. 453-456, 2011