Research Of The Digital Control System Of Inverter MAG Welding Machine

In a number of important production department, to ensure the highly efficient and reasonable automated production and to achieve "zero defects", "zero defect" quality control objectives, the real-time monitoring of the production process and online feedback of the production quality information are demanded urgently. But the traditional MAG welding machines are all the analog control system which used the integrated operational amplifier as the core, which could not communicate with the PC, it is difficult to achieve real-time monitoring of welding parameters and welding parameters on-line feedback. The traditional split-type MAG welding machines are composed by welding power source and wire feeder, the power source and wire feeder usually used the control cable to achieve the exchange of information. When welding, the distance between the welding position and the welding power source are often tens of meters away, the size and weight of the six control lines are very large. In the regulation of welding parameters, when the obstacles encountered, it is difficult to see the parameters displayed on the machine.In this paper, MAG welding inverter digital control system was designed based on PIC microcontroller. In this article, network distributed monitoring system is designed based on RS485 bus, which can achieve the real-time monitoring of welding parameters and welding parameters on-line feedback. PIC MCU are built In the wire feeder and welding power source, they use the model of two full-duplex asynchronous serial to communicate and exchange information. At the same time, man-machine interface systems, digital program-controlled system, the digital wire feed system are also designed. In software development, use C language and assembly language jointly to program, it is easy to achieve modular and portable. Because of Poor working conditions, high-frequency interference may affect the normal operation. This article designed anti-interference from two major aspects of hardware and software, which greatly improved the system stability and anti-jamming capability.Finally, welding process test, the results show that PIC is normal, data communications proper, wire feed speed, and welding process are stable.