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Gas tungsten arc models including the physics of the cathode layer: remaining issues
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0003-2535-8132
2018 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 62, no 1, p. 177-196Article in journal (Refereed) Published
Abstract [en]

A recent review pointed out that the existing models for gas tungsten arc coupling the electrode (a cathode) and the plasma are not yet complete enough. Their strength is to predict with good accuracy either the electric potential or the temperature field in the region delimited by the electrode and the workpiece. Their weakness is their poor ability to predict with good accuracy these two fields at once. However, both of these fields are important since they govern the heat flux to the workpiece through current density and temperature gradient. New developments have been made since then. They mainly concern the approaches addressing the electrode sheath (or space charge layer) that suffered from an underestimation of the arc temperature. These new developments are summarized and discussed, the modelling assumptions are examined, and important modelling issues that remain unexplored are underlined.

Place, publisher, year, edition, pages
2018. Vol. 62, no 1, p. 177-196
Keywords [en]
Refractory cathode, cathode surface state, cathode boundary layer, plasma column, modelling assumptions
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-11809DOI: 10.1007/s40194-017-0513-2ISI: 000428751000018Scopus ID: 2-s2.0-85040806998OAI: oai:DiVA.org:hv-11809DiVA, id: diva2:1158571
Available from: 2017-11-20 Created: 2017-11-20 Last updated: 2018-04-19Bibliographically approved

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Choquet, Isabelle

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