Parameter optimization of AC rectangular wave outputs for aluminum cold wire GTAW



Título del documento: Parameter optimization of AC rectangular wave outputs for aluminum cold wire GTAW
Revista: Journal of the Brazilian Society of Mechanical Sciences
Base de datos: PERIÓDICA
Número de sistema: 000311995
ISSN: 0100-7386
Autores: 1
Instituciones: 1Universidade Federal de Uberlandia, Uberlandia, Minas Gerais. Brasil
Año:
Periodo: Dic
Volumen: 21
Número: 4
Paginación: 664-674
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Experimental
Resumen en inglés The objective of this work was to optimize the parameter setup for GTAW of aluminum using an AC rectangular wave output and continuous feeding. A series of welds was carried-out in an industrial joint, with variation of the negative and positive current amplitude, the negative and positive duration time, the travel speed and the feeding speed. Another series was carried out to investigate the isolate effect of the negative duration time and travel speed. Bead geometry aspects were assessed, such as reinforcement, penetration, incomplete fusion and joint wall bridging. The results showed that currents at both polarities are remarkably more significant than the respective duration times. It was also shown that there is a straight relationship between welding speed and feeding speed and this relationship must be followed for obtaining sound beads. A very short positive duration time is enough for arc stability achievement and when the negative duration time is longer than 5 ms its effect on geometry appears. The possibility of optimizing the parameter selection, despite the high inter-correlation amongst them, was demonstrate through a computer program. An approach to reduce the number of variables in this process is also presented
Disciplinas: Ingeniería
Palabras clave: Ingeniería industrial,
Soldadura,
Aluminio,
Optimización estructural,
Parámetros
Keyword: Engineering,
Industrial engineering,
Welding,
Aluminum,
Structural optimization,
Parameters
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