| 2021 №08 (01) |
DOI of Article 10.37434/tpwj2021.08.02 |
2021 №08 (03) |
The Paton Welding Journal, 2021, #8, 8-10 pages
Development of technology for surfacing working layer of variable composition on crimping rolls
L.K. Leshchynskyi, V.P. Ivanov, V.M. Matviienko, K.K. Stepnov and E.I. Vozyanov
State Higher Education Institute «Pryazovskyi State Technical University» 7 Universytetska Str., 87555, Mariupol, Ukraine.
Abstract
It is shown that development of the technology for surfacing crimping rolls with the working layer of variable composition and mechanical properties along the body 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 during surfacing of the crimping rolls with a layer of variable composition of the C‒Cr‒Mo‒V alloying system, it is advisable to limit the content of elements within the ranges of 15Kh3GSMF – 24Kh4MFBS. It was demonstrated that the technology of surfacing crimping rolls with the working layer of variable composition is realized by feeding two strip electrodes LN-15Kh3GSMF and LN-24KhMFBS into the common weld pool. It was found that to obtain the required law of the change of the layer composition along the body length, the ratio of feed rates of the strip electrodes is changed in accordance with the carbon equivalent value 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 body wear decreases, and the operating time of rolls per 1 mm of wear of the working layer also increases. 9 Ref., 3 Tables, 2 Figures.
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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