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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v14.i3.20
pages 223-232

ANODE CARBON ENRICHMENT IN GMAW

F. Valensi
GREMI,Université d'Orléans/CNRS, Rue Gaston Berger, BP 4043, 18028 Bourges Cedex, France; Université d'Orléans, Avenue du Parc Floral, BP6749 Orléans Cedex2, France
N. Pellerin
CEMHTI, 1D avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France; Université d'Orléans, Avenue du Parc Floral, BP6749 Orléans Cedex2, France
Stephane Pellerin
GREMI, CNRS-Universite d'Orleans, BP 6759, 45067 Orleans Cedex 2, France LASEP, Universite d'Orleans - Antenne de Bourges, BP4043, 18028 Bourges, France
M. Collumeau
GREMI,Université d'Orléans/CNRS, Rue Gaston Berger, BP 4043, 18028 Bourges Cedex, France; Université d'Orléans, Avenue du Parc Floral, BP6749 Orléans Cedex2, France
A. Boutaghane
Centre de recherche scientifique et technique en soudage, et contrôle, CSC, Alger, Algérie, Route de Dely Ibrahim, BP, 64, Cheraga, Alger, Algérie
F. Briand
CTAS, Air LiquideWelding, Saint Ouen l'Aumone, 95315 Cergy-Pontoise Cedex, France

ABSTRACT

The shielding gas used in the welding process has a strong influence on the metal transfer characteristics. When the gas is chemically active the physicochemical properties of the electrodes can be strongly altered which can increase or decrease arc stability. In order to get a better control over the process it is essential to understand how the electrodes are affected. As the electrode extremities are molten they can easily adsorb gases from the shielding gas, which can affect their microstructure. CO2 is one of the most commonly used active shielding gases. It is then interesting to know if the liquid metal at the extremity of the electrode can adsorbed the carbon it supplies, as it has strong influence on steel mechanical properties. Besides, various phases can form during metal cooling, depending on its concentration. It is then possible to get information on the carbon content by studying the ratio between phases. In order to show a possible enrichment, only the relative spatial evolution can be studied and no accurate phase identification is needed. Cross sections of the samples have been studied, using mainly optic microscopy. The two main phase ratio have been calculated after processing the obtained images. The results show a higher ratio of the phase associated to the highest carbon content close to the sample periphery, which support the hypothesis of carbon adsorption by the molten metal.


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