Effect of the O^sub 2^/CO^sub 2^ ratio and welding current on the geometry of square groove weld joints in low carbon steels obtained with GMAW

• Published in: Welding international Vol. 24; no. 7; p. 499
• Main Authors: Cruz-Crespo, Amado, Morales, Félix Ramos, Gonzáles, Joel Chaparro, Pérez, Manuel Rodríguez, Morejón, Juan A Pozo, Puchol, Rafael Quintana
• Format: Journal Article
• Language: English
• Published: Cambridge Taylor & Francis Ltd 01.07.2010
• Subjects: Carbon dioxide; Electrodes; Low carbon steel; Oxygen; Steel alloys; Welding
• ISSN: 0950-7116; 1754-2138

Welding with fusible electrode and shielding gas (GMAW) using a shielding mixture based on CO... + O... is a procedure with high potential for joining low-carbon and low-alloy steels compared with traditional mixtures based on argon. One of the reasons for this is related to the possibility of achieving a high penetration level without the need to increase the heat supply of the electric arc, by employing the shielding mixture of CO... + O..., and the consequent decrease in the consumption of energy carriers. For that reason, the present paper presents a study on the influence of the shielding atmosphere characteristics (O.../CO... ratio) and the welding current in the geometry of square groove weld joints on plates. For this purpose, a factorial experimental design was applied to obtaining regression equations, which would map such a behaviour. The equations were obtained using the O.../CO... ratio and the welding current as independent variables. Nomograms were also plotted in order to make it easier to apply the results of this paper. (ProQuest: ... denotes formulae/symbols omitted.)