Avtomaticheskaya Svarka (Automatic Welding), № 7, 2019 г., с.46-52
Flux-cored wire for restoration surfacing of worn surfaces of railway wheels
V.D. Poznyakov, A.A. Gaivoronskiy, A.V. Klapatyuk, A.S. Shishkevich, V.A. Yashchuk
E.O. Paton Electric Welding Institute of the NAS of Ukraine.
11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: email@example.com
Research was performed and flux-cored wire of PP-AN180MN/98 grade was developed for restoration of wear by surfacing in advanced higher-strength railway wheels. A set of physico-mechanical properties of the deposited metal was determined. It is found that at application of PP-AN180MN/98 wire for surfacing higher-strength wheels, irrespective of preheating temperature and number of deposited layers, deposited metal hardness is optimum (0.94 – 1.0 of rail hardness). Here, in all the joint regions (in the deposited metal, fusion zone and overheated region of HAZ metal) a comparatively homogeneous bainite-martensite structure forms. The deposited metal features a high level of resistance to brittle fracture and wear at sliding friction in contact with rail steel. Obtained research results lead to the conclusion that at application of flux-cored wire PP-AN180MN/98 for surfacing, the restored wheels will have a high reliability, and traffic safety with be ensured under the conditions of increasing operating loads. 17 Ref., 5 Tabl., 4 Fig.
Keywords: electric-arc surfacing, railway wheel, flux-cored wire, structure, mechanical properties, brittle fracture, wear
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