Automatic Welding, 2016, №06



2016 №06 (25)

DOI of Article 10.15407/as2016.06.26

2016 №06 (27)

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Avtomaticheskaya Svarka (Automatic Welding), #6, 2016, pp. 162-165

Application of welding technologies for suppression of liquation in large ingots

V.A. Shapovalov

E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua


Abstract
The problem of liquation continuously attracts an attention of metallurgists and it is especially acute in producing of large ingots. Dendritic liquation can deteriorate the ingot so that it can occurr to be unsuitable for manufacture of large critical-purpose parts. It is shown that the main cause of liquation is a low rate of solidification. Its increase is impossible in melting of large ingots by using the traditional technologies. Therefore, one of the ways of suppression of the dendritic liquation is a stage-by-stage surfacing (formation) of ingots by using the welding technologies. The article gives the experimental data confirming the feasibility of the ingot structure control independently of its sizes. The fields of application of the suggested approach for manufacture of critical products are predicted. 10 Ref., 5 Figures.

Keywords: dendritic liquation, coefficient of distribution, rate of solidification, ESR, VAR, EBR, PAR, macro- and microstructure


Received:                28.04.16
Published:               19.07.16


References

1. (1961) Technology of semiconductor materials. Ed. by G. Bridgers et al. Moscow: Oborongiz.
2. Flemings, M. (1977) Solidification processing. Ed. by A.A. Zhukov. Moscow: Mir.
3. Nekhenzi, Yu.A. (1948) Steel casting. Moscow: GINTL ChTsM.
4. Mitchell, A., Belestain, A.S. (1985) Factors influencing temperature and solidification of ingots in ESR. Pereplav, Issue 6, 192–198.
5. Datta, R., Million, K., Zimmermann, H. (2003) Shape welding with MnMoNi alloys for heavy components. Welding and Cutting, 55(4), 216–224.
6. Diltey, U., Stein, I., Berger, C. et al. (2006) Future prospects of shape welding. , 5(3), 164–172.
7. Shapovalov, V.A., Latash, Yu.V., Zholud, V.V. et al. (2001) Large flat tungsten and molybdenum single crystals and methods of its production. In: of 7^th Int. Symp. on Pure Metals (Kharkov, 2001), 39–42.
8. Shapovalov, V.A., Latash, Yu.V., Borimskaya, S.T. et al. (2001) Oriented tungsten single crystals: producing, examination and application. Metally, 1, 6–64.
9. Shapovalov, V.A., Grigorenko, G.M. (2015) Suppression of liquation processes in large ingots. Sovrem. Elektrometall., 1, 26–30. https://doi.org/10.15407/sem2015.01.05
10. Shapovalov, V.A., Tsykulenko, K.A., Shapovalov, E.V. et al. (2015) Formation of large ingot by method of moving of local metal pool. Elektrometallurgiya, 2, 36–43.