A review of cathode-arc coupling modeling in GTAW
2016 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 60, no 4, 821-835 p.Article in journal (Refereed) PublishedText
Material properties of welds are strongly influenced by the thermal history, including the thermo-fluid and electromagnetic phenomena in the weld pool and the arc heat source. A necessary condition for arc heat source models to be predictive is to include the plasma column, the cathode, and the cathode layer providing their thermal and electric coupling. Different cathode layer models based on significantly different physical assumptions are being used. This paper summarizes today’s state of the art of cathode layer modeling of refractory cathodes used in GTAW at atmospheric pressure. The fundamentals of the cathode layer and its physics are addressed. The main modeling approaches, namely (i) the diffusion approach, (ii) the partial LTE approach, and (iii) the hydrodynamic approach are discussed and compared. The most relevant publications are systematically categorized with regard to the respective physical phenomena addressed. Results and process understanding gained with these models are summarized. Finally, some open questions are underlined.
Place, publisher, year, edition, pages
2016. Vol. 60, no 4, 821-835 p.
GTA Welding, Cathodes, Mathematical models, Tungsten electrodes, Reviews, Simulating, Plasma, Heat flow
Applied Mechanics Manufacturing, Surface and Joining Technology
Research subject ENGINEERING, Manufacturing and materials engineering
IdentifiersURN: urn:nbn:se:hv:diva-9268DOI: 10.1007/s40194-016-0319-7ISI: 000385025900020ScopusID: 2-s2.0-84975709499OAI: oai:DiVA.org:hv-9268DiVA: diva2:919108
First online: 21 March 20162016-04-132016-03-302016-12-19Bibliographically approved