Digital Control Of Submerged Arc Welding Machine

The characteristic, history, actuality and foreground of submerged arc welding are introduced in the introduction part of this paper. It analyses the advantages and disadvantages of analog circuit control system and digital control system, point out that digital is the direction. It has an analysis on the process of submerged arc welding and control system, discusses the theory and reason of change-speed wire-feed system, analysis characteristic of the electrical arc, offer the theory for the design of digital control system of the submerged arc welding.According to the problems of too big body, complex control circuit and bad reliability, it design control system of microprocessor and FPGA, based on analog control system. Because the uniformity of wire-feed speed affects welding process to be stable and weld joint quality directly. Good control system of the wire-feed speed is precondition of realize high grade weld. This article design a fuzzy controller based on the VHDL language, according to the characteristic of electric arc specially. It is used to adjust the wire-feed speed, in order to make the electrical arc stable. The speed of the car adjusts by the closed-loop control. The PWM pulse drives the motor produced by digital PL To designed the welding program with the VHDL language, according to the characteristic of the flow with the submerged arc welding, to realize the entire control of welding process and all kinds of protection functions.Electromagnetism disturbances are inevitable in digital control system. Reliability and noise resistance designs are also covered in control circuit and software. The reasons of disturbance are analyzed, and some hardware and software measures are adopted in chart design, PCB making and program.Do an experiment on the control system of this paper, the experiment results indicates: It can meet the request of power source and process...