TPWJ, 2020, #5, 24-28 pages
Improvement of crack resistance of banded support rolls at high-speed surfacing with low energy input
S.V. Shchetynin, V.I. Shchetynina and S.P. Desyatskii
Priazovskyi State Technical University
7 Universitetskaya Str., 87555 Mariupol, Ukraine. E-mail: firstname.lastname@example.org
The objective of the work is improvement of deposited metal crack resistance and development of the process of highspeed
surfacing of banded support rolls with a low energy input. In order to achieve the set objective, we developed the
process of improving the crack resistance due to high-speed surfacing of banded support rolls with a low energy input.
In keeping with the equation of heat propagation at high-speed surfacing with a low energy input, increase of deposition
rate is accompanied by lowering of the heat input, narrowing of melting isotherm width and HAZ. Calculation and
experimental methods were used to establish that at increase of deposition rate, lower heat input results in decrease
of deformations and welding stresses, and reduction of the HAZ, where cold cracks form, that prevents delamination
of the deposited metal. Melting and solidification rates rise, time of the pool staying in the liquid state is reduced that
prevents liquid metal flowing out of the weld pool and improves deposited metal formation. Established regularities
were the base for development of the process of high-speed surfacing with low energy input, at which the heat input and
welding stresses decrease, HAZ is reduced and deposited metal delamination is prevented, melting and solidification
rates increase, time of the pool staying in the liquid state becomes shorter, and crack resistance of banded support rolls
becomes higher. Developed process of high-speed surfacing of banded support rolls with a low energy input provides a
lowering of the heat input and welding stresses, HAZ reduction, increase of melting and solidification rates and crack
resistance, and absence of deposited metal delamination or band failures. 11 Ref., 6 Figures.
high-speed surfacing with low energy input, melting isotherms, heat input, welding stresses, HAZ, crack
resistance, banded support rolls
1. Prokhorov, N.N. (1976) Physical processes in metal during
welding. Moscow, Metallurgiya [in Russian].
2. Shorshorov, M.Kh., Belov, V.V. (1972) Phase transformations
and changes of properties of steel in welding. Moscow,
Nauka [in Russian].
3. Makhnenko, V.I. (1976) Calculation methods of investigation
of kinetics of welding stresses and strains. Kiev, Naukova
Dumka [in Russian].
4. Makhnenko, V.I., Poznyakov, V.D., Velikoivanenko, E.A. et
al. (2009) Risk of cold cracking in welding of structural highstrength
steels. The Paton Welding J., 12, 2−6.
5. Yushchenko, K.A., Velikoivanenko, E.A., Chervyakov, N.O. et al. (2016) Effect of anisotropy of properties of nickel alloy on stresses and plastic deformations in weld zone. Ibid., 1 0, 2-7. https://doi.org/10.15407/tpwj2016.10.01
6. Finkel, V.M. (1970) Physics of fracture. Moscow, Metallurgiya
7. Nikolaev, G.A., Kutkin, S.A., Vinokurov, V.A. (1982)
Strength of welded joints and deformations of structures.
Moscow, Vysshaya Shkola [in Russian].
8. Vinokurov, V.A., Grigoryants, A.G. (1984) Theory of welding
stresses and strains. Moscow, Mashinostroenie [in Russian].
9. Rykalin, N.N. (1951) Calculation of thermal processes in
welding. Moscow, Mashgiz [in Russian].
10. Volobuev, Yu.V., Fedorov, V.G., Kuligin, G.B. (1983) Evaluation
of influence of parameters of welding thermal cycle
on austenitic grain size in heat-affected zone of steels of
12KhN4MA type. Svarochn. Proizvodstvo, 12, 6−8 [in Russian].
11. Shchetynin, S.V., Shchetynina,V.I. (2019) Method of electric
arc surfacing of low-carbon steels. Ukraine Pat. 119594, Int.
Cl. B23 K 9/04 [in Ukrainian].
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