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Appl. Sci. 2017, 7(5), 503;

On the Visualization of Gas Metal Arc Welding Plasma and the Relationship Between Arc Length and Voltage

Centre for Advanced Materials Joining (CAMJ), Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
Liburdi Engineering Limited, 400 Highway 6 North, Dundas, ON L9H 7K4, Canada
Current address: Department of Materials Engineering, Federal University of Sao Carlos (UFSCar), Rodovia Washington Luís /km 235, São Carlos, CEP 13565-905, São Paulo, Brazil.
Current address: Department of Mechanical Engineering, Polytechnic Institute, Pontifical Catholic University of Minas Gerais (PUC Minas), Avenida Dom José Gaspar 500 , Belo Horizonte, CEP 30535-901, Minas Gerais, Brazil.
Author to whom correspondence should be addressed.
Academic Editors: Hai-Lung Tsai and Junling Hu
Received: 18 March 2017 / Revised: 25 April 2017 / Accepted: 9 May 2017 / Published: 15 May 2017
(This article belongs to the Special Issue Gas Metal Arc Welding)
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In this article, the camera settings for high-speed imaging of the arc, metal transfer, and weld pool in gas metal arc welding (GMAW) are investigated. The results show that by only changing camera exposure times and the selection of narrow bandpass filters, images that reveal features of the arc such as the iron vapor-dominated region, metal transfer and weld pool behavior can be produced without the need for external light sources. Using the images acquired, the arc length was measured and the relationship between arc length and arc voltage is discussed. The results show that for low values of current, the measured welding voltage increases with increasing arc length; however, for high current values, the arc voltage increases even though the measured arc length becomes shorter. It is suggested that the increase in arc voltage for high values of welding current is due to the increased evaporation of the wire electrode which decreases the plasma temperature and consequently the arc plasma electrical conductivity. View Full-Text
Keywords: welding; GMAW; high speed imaging; arc length; arc voltage; arc plasma; iron vapor welding; GMAW; high speed imaging; arc length; arc voltage; arc plasma; iron vapor

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Dos Santos, E.B.F.; Kuroiwa, L.H.; Ferreira, A.F.C.; Pistor, R.; Gerlich, A.P. On the Visualization of Gas Metal Arc Welding Plasma and the Relationship Between Arc Length and Voltage. Appl. Sci. 2017, 7, 503.

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