Mathematical Modeling And Simulation In Digital Control Of CO₂ Gas Shielded Welding Short-circuit Transition

The CO₂ gas shielded welding of high efficiency and low cost properties to become the preferred welding technique in many applications field. However, because of spatter and bad weld forming, CO2 gas shielded welding will be greatly hindered. Some intelligent control methods, especially the STT-wave control method, solved the problems in a large extent. In order to design suitable intelligent welding power for STT and improve the STT-wave control technology, it is necessary to in-depth study the whole process of droplet short-circuit-transition. It will cost too money and time through the actual experiment method, and some parameters not easily to be directly observed. And the problem will be sloved by adopting computer simulation technology.On the basis of the system's structure and STT-wave control principle, this paper determined the simulation program and set up suitable mathematical models. And it simulates using advanced programming language (MATLAB) to study the feasibility and select the parameters of the system. Finally using common simulation environment, it sets up a system simulation platform of the droplet short-circuit transition behavior. Use of the Simulation Platform for a number of simulation experiments, it study this simulation system stability and adaptability of experiment and the STT-wave control method's law.This paper makes an improved mathematical modeling method of non-linear load based on stress analysis, which will be significant of theoretical research. And it sets up innovate simulation system based on STT Waveform-control using general simulation environment.With the system,different experimental conditions can be simulated, to some extent, substitute for the actual experiment to support intelligent welding power design and research with practical applications value.