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Influence of the CO2 Content on Operational Performance of Short-Circuit GMAW
Center for Research and Development of Welding Processes of Federal University of Uberlandia (Laprosolda), Brazil.
University West, Department of Engineering Science, Division of Production Engineering. (PTW)ORCID iD: 0000-0002-1005-5895
2015 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 59, no 2, p. 217-224Article in journal (Refereed) Published
Abstract [en]

CO2 blended with Ar is the most common shielding gas used for short-circuit GMAW. There has been some technical knowledge devised from the process application over the years (personal opinion and results from practice) on the selection of the gas blend composition. However, there is still lack of more scientific data to explain the performance of the mixtures. This paper presents a systematic study of the influence that CO2 content in mixture with Argon has on the operational performance of the short-circuit GMAW. The objective of this study was to describe, to quantify and to explain the alterations in the metal transfer behavior, spatter generation, weld bead geometry and bead finish due to the different CO2 contents in the shielding gas. Carbon steel plates were welded in adequate parametric conditions for each CO2+Ar shielding gas composition (CO2 ranging from 2% to 100%). These parametric conditions were found by applying a metal transfer regularity index over welds carried out at different voltage settings for each gas blend. A target of 130 A was applied as base for comparison. Laser shadowgraphy with high speed filming and current and voltage oscillograms were used as analysis tools. The results showed (and confirmed) that the increase of the CO2 content deteriorates metal transfer regularity, leading to excessive spatter generation and uneven bead appearance, but increases the penetration and the fusion area of the weld beads and improves bead convexity. In general, the CO2 content should neither be lower than 10% (unless for thin plates) nor higher than 30%.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2015. Vol. 59, no 2, p. 217-224
Keywords [en]
GMAW, shielding gas, CO2 content, short-circuit metal transfer
National Category
Materials Engineering
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-6945DOI: 10.1007/s40194-014-0196-xOAI: oai:DiVA.org:hv-6945DiVA, id: diva2:759558
Available from: 2014-10-30 Created: 2014-10-30 Last updated: 2018-04-10Bibliographically approved

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Scotti, Americo

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