Computer Simulation Of CO₂ Short-Circuit Transfer Welding Based On Arc-Inverter System

CO2 gas shield arc welding has been widely applied because of its many advantages. In this paper, the computer simulation of CO2 arc welding process is studied. This dissertation consists of such parts as follows:Firstly, the application of CO2 gas shield arc welding is introduced, and the usual defects and cause of defects are analyzed. The signification of the study of CO2 gas shield arc welding with computer simulation is pointed out.Secondly, the basic theory of system simulation and general process of simulation experiment are described. The role of math model , the method to make it and the character of simulation are discussed, which are the base of making model.Thirdly, on the base of waveform control method and MATLAB, modularization method is used in the establishment of simulation model of both general CO2 welding short-circuit transfer process and CO2 welding short-circuit transfer process with waveform control. The influenceof inverting harmonious wave has been taken into account in the above models, and the control process of high power switch component is simulated .Fourthly, the influence of some parameters to welding process is analyzed using above two models. The result is reasonable, and the simulation waveform corresponds basically to the control scheme , which proves primarily that simulation method of this dissertation is viable.Fifthly, a lot of experiments have been carried out. The results of computer simulation not only are verified by experiment results, but also accord with correlative theory analysis.At the end of this dissertation, the conclusion is put forward that the simulation model is reasonable and the computer simulation of CO2 welding short-circuit transfer process is viable.