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2021 №08 (02) DOI of Article
2021 №08 (04)

Automatic Welding 2021 #08
Avtomaticheskaya Svarka (Automatic Welding), #8, 2021, pp. 14-17

Development of surfacing technology for the working layer of variable composition on the blooming rolls

L.K. Leshchinskiy, V.P. Ivanov, V.M. Matviyenko, K.K. Stepnov, E.I. Vozyanov
State Higher Education Institute «Pryazovskyi State Technical University», 7 Universitetskaya Str., 87555, Mariupоl, Ukraine. E-mail: ivanov_v_p@pstu.edu

It is shown that development of the technology of surfacing of crimping rolls with a working layer of variable composition and mechanical properties along the barrel length makes it possible to minimize the unevenness of wear, especially in the area with its greatest depth. Application of this technology involves the use of a control system that provides separate control of the feed drive for each of the electrodes. It is shown that when surfacing the crimping rolls with a layer of variable composition of C-Cr-Mo-V alloying system, it is advisable to limit the content of elements within the range of 15Kh3GSMF – 24Kh4MFBS. It is demonstrated that the technology of surfacing of crimping rolls with a working layer of variable composition is realized by feeding two strip electrodes LN-15Kh3GSMF and LN-24Kh4MFBS into the common weld pool. It was found that to obtain the required law of the change of the layer composition along the barrel length, the ratio of feed rates of the strip electrodes is changed in accordance with the carbon equivalent index of the metal of strip electrodes. It is shown that during operation of horizontal rolls of the slabbing mill, surfaced with a layer of variable composition, the unevenness of barrel wear decreases, and the rolls operating time per 1 mm of wear of the working layer also increases. 9 Ref., 3 Tabl., 2 Fig.
Keywords: surfacing, working layer, variable chemical composition, carbon equivalent, strip electrodes, crimping roll, uneven wear, law of hardness change

Received: 01.07.2021


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