SEM, 2019, #4, 26-31 pages
Publisher International Association «Welding»
ISSN 2415-8445 (print)
Issue № 4, 2019 (November)
Forming consumable electrodes from briquetted sponge titanium in electron beam unit
S.V. Akhonin1, A.N. Pikulin1, V.O. Berezos1, A.Yu. Severin1, O.G. Erokhin2
E.O. Paton Electric Welding Institute of the NAS of Ukraine.
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: email@example.com
SC «SPC «Titan» of the E.O. Paton Electric Welding Institute of the NAS of Ukraine».
26 Raketna Str., 03028, Kyiv, Ukraine. Е-mail: firstname.lastname@example.org
A set of research works on electron beam melting of the surface layer of consumable electrodes from briquetted sponge titanium of TG110 grade was performed in a specialized electron beam unit. Electron beam melting of both its entire surface layer and of just the longitudinal sections was conducted, in order to assess the increase of consumable electrode strength properties. The results of the performed work showed that the surface layer is melted-through completely to the depth of up to 13 mm for electrodes with the surface partially treated by a focused electron beam and up to 9 mm for electrodes with the surface completely treated by scanning electron beam, and the melted layer metal is characterized by a cast structure with absence of cavities or discontinuities, with gas impurity content on the level of standard requirements. Experimental data were used to calculate the safety factors of consumable electrodes from compacted briquettes of sponge titanium, treated by the electron beam. It is shown that partially treated by focused electron beam surface of the consumable electrode formed from briquetted sponge titanium with minimum penetration depth of 6 mm, ensures sufficient strength properties of the electrode that will allow preventing its failure during melting in the furnace working space. The completely melted by a scanning electron beam surface layer of a consumable electrode formed from briquetted sponge titanium of minimum thickness of 4 mm, will provide sufficient characteristics of electrode strength and will prevent saturation of inner layers of sponge titanium electrode with moisture, when exposed to open air. Ref. 10, Tabl. 1, Fig. 8.
Key words: electron beam surface melting; consumable electrode; electron beam gun; surface layer; penetration depth; safety factor
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