S18  Processos Mecânico-Metalúrgicos    Titulo: EFFECT OF THE WELDING PARAMETERS ON THE ECONOMIC CHARACTERISTICS OF SMAW PROCESS   Resumo : ABSTRACT. THE AIM OF THIS PRESENT WORK WAS TO EVALUATE THE INFLUENCE OF THE SHORT-CIRCUITING CURRENT AND THE REFERENCE VOLTAGE (SHORT-CIRCUIT CONTROL) ON THE ECONOMIC CHARACTERISTICS OF THE ELECTRODES. TO DO SO, A SERIES OF SINGLE-V GROOVE JOINT WELDS WAS CARRIED-OUT WITH A WELDER SIMULATOR, ON FLAT AND OVERHEAD POSITIONS, USING THE STATISTICAL TECHNIQUE TAGUCHI S METHOD FOR THE EXPERIMENTAL DESIGN. A SECONDARY-CHOPPED POWER SUPPLY WITH THE CAPABILITY TO SET THE SHORT-CIRCUIT CONTROL PARAMETERS WAS USED ALONG WITH A COMPUTER BASED ELECTRICAL SIGNAL DATA LOGGER AND ANALYSER. THE CONTROL FACTORS WERE THE REFERENCE VOLTAGE, THE SHORT-CIRCUITING CURRENT, THE MEAN CURRENT, THE WELDING POSITION AND THE TYPE OF ELECTRODE (COMMERCIAL RUTILIC, BASIC AND CELULOSIC OF 3,25 MM OF DIAMETER). IN EACH EXPERIMENT, THE ADDED AREA OF THE WELD BEAD WAS KEPT CONSTANT, BY THE VARIATION OF TRAVEL SPEED. THE RESULTS INDICATED THAT, FOR THE CONDITIONS USED IN THIS WORK, THERE IS NO DETRIMENTAL EFFECT IN THE USE OF THE SHORT-CIRCUIT CONTROL ON THE ECONOMICS CHARACTERISTICS OF THE ELECTRODES. STILL, IT WAS CONCLUDED THAT THE ECONOMICS CHARACTERISTICS OF THE ELECTRODES WERE AFFECTED MOSTLY BY THE WELDING POSITION, THE MEAN CURRENT AND THE TYPE OF ELECTRODE. KEYWORDS: MMA, ECONOMICS CHARACTERISTICS, POWER SUPPLY, SHORT-CIRCUIT CONTROL.     Autores : Correia, Davi Sampaio Farias, Jesualdo Pereira Scotti, Américo 0     Trabalho Completo :   COBEM99 | Comissão  Organizadora | Palestras | Sessões Técnicas | Autor | Simpósios e Sessões Especiais | Revisores |  Título  dos  Trabalhos | Local