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

Application of welding technologies for suppression of liquation in large ingots