Study On The Parameters Monitoring System For Resistance Spot Welding Based On USB

Resistance spot welding has the advantages of high mechanization and high automaticity, simplicity of operation and good working conditions, which is used widely in automobile, aviation industry etc. According to the data, the quantity used by the spot welding is about 33 percent of that used by overall welding method. Resistance welding has large welding current and short welding time and its many disturb factors affect each other. The welding procession is instantaneous and the formation of the spot is sightless. Those make resistance spot welding quality control and monitoring more difficult. Therefore, enhances the welding spot quality and the quality stability is the key of the resistance spot welding quality control research.Research shows that dynamic signal of resistance spot welding process contains a lot of information, which directly or indirectly reflect the welding spot quality. For resistance spot welding, the connection intensity of welding spot mainly decided by geometry dimension of the welding nugget, and which are controlled by many spot welding process parameters, such as welding current, welding period, electrode force and so on. In addition, some process features such as spot welding electrode voltage, dynamic resistance also reflect the welding spot quality information from one aspect. Therefore the monitor of technology parameters of spot welding plays as the important role in reality welding production.In order to meet these needs, the paper has researched resistance spot welding technology parameters monitor system based on USB bus, using which real-time monitoring spot welding parameters, such as welding current,welding time and electrode force and electrode force. It has the function of data acquisition, data disposal, data storage, data display and transmission. This system takes SOC as lower computer to collect and disposal the data of welding current, electrode voltage and electrode force, then processing and storage those data. Meanwhile the system takes...