| Welding technology is known as the "steel tailor" of the manufacturing industry,as high-power inverter plays a vital role in it.High-power inverter due to its good welding performance,light weight,high power factor,has been widely used in the field of welding.However,the welding device working environment is relatively poor,especially when more than one welder work,because the voltage and current fluctuations,welding quality is difficult to guarantee,furthermore,the improper adjustment of the welding process parameters for the welder,and the improper welding operation,lead to welding defects.At the same time many welding equipment are difficult to management,which caused a management blind spot.If the welding process can be tradable managed and real-time online analysis of welding quality,the quality of welding will greatly improved by the closed-loop weld control.In view of above problems,this paper studies the high power inverter group control system.Multi-welder can be remote centralized managed by the system,and realize the integration of information technology and traditional welding industry.The welding process parameters are remotely set according to the welding process database,and the key parameters such as welding current and arc voltage during the welding process are recorded in the database in real time.The traceability management of the welding process is realized and the data are processed in real time and analyzed,all of this will avoid the occurrence of welding quality defects,and reduce production costs effectively.First of all.this paper analyzes the requirements of high power inverter system,and designs the overall structure of the system and the internal structure of the wireless collection terminal.Group control system uses a three-tier network structure,including management,control layer and the scene layer.The system regards the group control server as the core,and the using of B/S software model greatly reduce the system upgrade and maintenance costs.Secondly,a multi-channel Wi-Fi network based on multi-channel Wi-Fi is proposed.The multi-channel multi-path Wi-Fi network is constructed by ad hoc network algorithm,and the data frame and heartbeat packet mechanism are designed.The terminal node communicates with the server through the TCP/IP protocol.The simulation results show that the proposed method can improve the communication reliability index of the system.Then,the signal processing and quality evaluation method of welding process are studied.The arc voltage and welding current are selected as the research object.Wavelet denoising algorithm is used to perform wavelet denoising.Then,the signal is analyzed from different angles,including the analysis of the time domain waveform of the droplet transition,the probability analysis of the welding voltage and current,and the method of judging the stability of the arc welding based on the U-I binary image.Finally,the group control system was designed,including the ESP8266 wireless Wi-Fi module and STM32-based communication terminal hardware and software design,the use of SQL SERVER set up the group control system database,the B/S architecture Group control server software was designed based on VS2012.The results show that the high power inverter group control system realizes real-time monitoring welding process data,and achieves the expected design goal. |
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