Modeling and estimating for external characteristic of welding power source

A mathematical modeling method, theory and process based on measured data from the dropping external characteristic of a thyristor rectifier for arc welding power source have been introduced in this paper. The instance shows the model structure obtained with this method is simple and it can accurately denote the U–I characteristic for welding power. This model can also predict the self-adjusting performance of electric current and short circuit current parameters on different given conditions. This method can not only handle the post-process problem in measuring data, but it can make the limited measuring message be a more effective application.