Based On Fuzzy Comprehensive Evaluation Of The Resistance Welding Group Control System Development,

Resistance welding group control (RWGC) refers to the coordination and management control of a group of resistance welders. By using the CAN bus technology , RWGC system collects and analyzes the data from the welders and the welding process, and then performs control, compensation, parameters modification, alarming, monitoring and optimization through synthetic analysis and reasoning. To ensure normal welding and improve the welding quality, this paper proposes a electricity switching control strategy to control the welders of the system. In this paper, the research and design of the resistance welding group control system are given in detail. The main contents of this paper are as follows.Firstly, the influence of welding current to the molding of welding joint melt kernel and the supply voltage is analyzed qualitatively. The welding quality depends on the stability of the welding current. During the welding process with a group of welders, to ensure that each welder works with adequate welding current is critical to welding quality. The RWGC system adopts fuzzy electricity switching control strategy to ensure each welder works with adequate welding current.Secondly, this paper discusses the influence of the welding process to the power supply system. Welding process has characteristics of high current and short working period. When a number of welder works simultaneously, the total welding current may exceed the capacity of the transformers, which will lead to the shortage of welding current supply, and affect the welding quality. Usually the welders have single phase power supply. In the welding process with a group of welders, the welders work randomly, this will lead to an imbalance of three phase power supply and may make power transformers work improperly.Thirdly, this paper presents the function design and its implementation of the RWGC system in detail. It also designs the interface circuit between SJA1000 CAN chip and PC, and develops the packet data communication protocol.Fourthly, a working request queue control algorithm and an optimized power-on priority fuzzy decision making algorithm are proposed, which optimizes the welding process and the workshop resources, ensures the welding quality and ensures that the power supply system works in a balanced way.Finally, the RWGC software is developed with Visual C++ based on Windows XP. The system has a good man-machine interface and the functions of dynamic display, fault alarming, comprehensive and reliable data exchange, processing and storage, etc.