| This paper developed a visual instrument system about arc welding parameters monitoring and analysis based on USB type MCU —C8051F320. The system is composed of hardware circuit and software system. The signal source comes from welding current and arc voltage. USB2.0 communication protocol, wavelet analysis theory and artificial nerve network theory involved are illustrated and the development of the system is clearly analyzed. Data acquisition system hardware core is based on C8051F320 which integrates USB controller of USB2.0 protocol and A/D unit. This hardware design is more convenient and the cost is lower than the design by general data acquisition card. It has the characteristic of Plug&Play of USB bus. The performance is excellent and easy to realize integration of embedded-system. Firmware, USB driver and advanced application program constitute software system. The firmware is developed by C language and the USB driver is automatically created by VISA (Virtual Instrument Software Architecture) which realized the controlling of USB fixture. Advanced application program is developed by LabVIEW language. The system possess the function of signal real time acquisition, wave curve redisplay, data save and curve print. The system have the analysis function of wavelet eliminate noise to 8 level, distilling characteristic information in welding by wavelet, instantaneous U-I curve, probability density distribution curve about welding current and arc voltage, frequence distribution curve about short-circuit cycle and arc cycle, parameters statistic analysis and based on which estimating welding quality by artificial nerve network. The system of arc welding parameters monitoring and analysis realized the data communication between USB type MCU and LabVIEW develop flat and provided a high efficiency and portable system about welding quality analysis and forecast for welding manufacture and experiment.
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