TPWJ, 2019, #3, 11-14 pages
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue #3, 2019 (March)
Effect of reheating in multipass submerged-arc welding on delayed fracture resistance of rotor steel welded joints
V.Yu. Skulsky1, S.I. Moravetsky1, M.A. Nimko1, Yu.G. Pashchenko2, A.G. Kantor2 and V.V. Dmytryk3
E.O. Paton Electric Welding Institute of the NAS of Ukraine
11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: email@example.com
199 Moscow Ave., 61037, Kharkov, Ukraine. E-mail: office @turboatom.con.ua
NTU «Kharkov Polytechnic Institute»
2 Kirpicheva Str., 61002, Kharkov, Ukraine
The change in relayed fracture resistance, depending on preheating temperature and thermal effect during deposition of new beads was experimentally studied, using the Implant method, in the case of 0.25C–2CrNiMoV rotor steel joints, produced by submerged-arc welding. The nature of the change in hardness in the cross-section of quenching steel with a deposited bead was investigated, which illustrates formation of quenching and tempering areas under the influence of reheating in welding. Using critical stresses as a quantitative index, causing delayed fracture, it was shown that after reheating in welding, the cracking resistance can increase by about 1.5–2.5 times or more. Under the conditions of welding without preheating, one-time and two-time cycles of heating in welding increase the cracking resistance up to the level obtained during welding with preheating up to 150–200 °C. 9 Ref., 4 Figures.
Keywords: heat-resistant rotor steel, submerged-arc welding, quenching, reheating in welding, Implant, delayed fracture resistance
1. Lobanov, L.M., Mikhoduj, L.I., Pivtorak, V.A. et al. (1995) Influence of peculiarities of submerged-arc welding technology on stress state of high-strength steel welded joints. Avtomatich. Svarka, 9, 21-23 [in Russian].
2. Burashenko, I.A., Zvezdin, Yu.I., Tsukanov, V.V. (1981) Substantiation of heating temperature in welding Cr-Ni-Mo-V steels of martensitic class. Ibid., 11, 16-20 [in Russian].
3. Novikov, I.I. (1971) Theory of heat treatment. Moscow, Metallurgiya [in Russian].
4. Skulsky, V.Yu. (2009) Weldability of heat-resistant steels for boiler units of high parameters: Syn. of Thesis for Dr. of Techn. Sci. Degree. Kyiv, PWI [in Ukrainian].
5. Tsaryuk, A.K., Skulsky, V.Yu., Moravetsky, S.I. (2016) Mechanized narrow-gap submerged-arc welding of thick-walled cylindrical products. In: Proc. of 2nd Medovar Memorium Symp. (June 7-10, 2016, Kyiv, Ukraine). Kyiv, Elmet-Roll.
6. Skulsky, V.Yu., Strizhius, G.N., Nimko, M.A. et al. (2019) Delayed fracture resistance of welded joints of rotor steel 25Kh2NMFA after welding reheating. The Paton Welding J., 2, 7-12. https://doi.org/10.15407/tpwj2019.02.01
7. Kozlov, R.A. (1986) Welding of heat-resistant steels. Leningrad, Mashinostroenie [in Russian].
8. Skulsky, V.Yu. (2009) Thermokinetic peculiarities of formation of cold cracks in welded joints on hardening heat-resistant steels. The Paton Welding J., 3, 8-11.
9. Oring, H., Shuetz, H., Klug, P. (1996) Vorwaermen aus Sicht des Schweissgutes bei hoch- und warmfesten Schweissverbindungen. Schweisstechnik, 1, 4-8 [in German].