Modelagem e Controle Fuzzy do processo soldagem ao arco elétrico com arame tubular

Abstract

This paper presents the results obtained in a study for modeling and intelligent control of process of welding with fl ux cored wire. The objective was to improve the quality of the welding process by employing the technique of fuzzy automatic control, in order to reduce the undesirable effects of variations in the process, these variations can be caused a manual operation of the welding torch as well as by limitations in the non-regulated energy sources. First a phenomenological modeling of the dynamics of the tubular wire, was transform aiming to obtain a representation in terms of a state space modes suitable for studies of automatic control, with the subsequent implementation of the model in Matlab / Simulink. Then a fuzzy controller, the at Mandani type, was designed to perform the dynamic control of the switching frequency of IGBT converter, regulating thereby the energy supplied by the source to the welding process. The performance of fuzzy controller was then assessed by simulation studies, with the dynamic model developed, as well as experimentally in a laboratory test bench. For the experimental tests, the fuzzy control law was embedded in a microcontroller DSPIC hardware system. The results obtained in the tests show the good performance of the technique investigated