2020 №04 (03) DOI of Article
2020 №04 (05)

Electrometallurgy Today 2020 #04
SEM, 2020, #4, 23-27 pages

Metallurgical arc plasmatrons

V.O. Shapovalov
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

The problem of the service life of metallurgical plasmatrons is considered. It is shown that the area of the arc spot does not increase in proportion to the increase in the arc current. Increasing the current density in the arc spot leads to melting of the surface of the electrode on which the arc rests. To reduce the local current load on the electrode, it is proposed to make the electrode on which the arc rests split with controlled current load on each elementary electrode. The design of the split copper electrode assembly was implemented in the laboratory and has shown its efficiency. At some distance from the electrode, the elementary arcs are contracted into a single arc column. Ref. 13, Fig. 3.
Keywords: electric arc; near-electrode voltage drop; arc spots; plasmatron electrode

Received 30.11.2020


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