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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">blackmet</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Черная Металлургия</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya. Ferrous Metallurgy</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-0797</issn><issn pub-type="epub">2410-2091</issn><publisher><publisher-name>National University of Science and Technology "MISIS"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/0368-0797-2020-5-305-312</article-id><article-id custom-type="elpub" pub-id-type="custom">blackmet-1890</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МЕТАЛЛУРГИЧЕСКИЕ ТЕХНОЛОГИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>METALLURGICAL TECHNOLOGIES</subject></subj-group></article-categories><title-group><article-title>Разработка и моделирование технологического процесса сварки дифференцированно термоупрочненных железнодорожных рельсов. Промышленное опробование</article-title><trans-title-group xml:lang="en"><trans-title>Welding of differentially heat-strengthened rails. Industrial testing</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Козырев</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kozyrev</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д.т.н., профессор, заведующий кафедрой материаловедения, литейного и сварочного производства</p><p>654007, Кемеровская обл., Новокузнецк, ул. Кирова, 42</p></bio><bio xml:lang="en"><p>Dr. Sci. (Eng.), Professor, Head of the Chair “ rials, Foundry and Welding Production”</p><p>Novokuznetsk, Kemerovo Region</p></bio><email xlink:type="simple">kozyrev_na@mtsp.sibsiu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шевченко</surname><given-names>Р. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Shevchenko</surname><given-names>R. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ассистент кафедры материаловедения, литейного и сварочного производства</p><p>654007, Кемеровская обл., Новокузнецк, ул. Кирова, 42</p></bio><bio xml:lang="en"><p>Assistant of the Chair “Materials, Foundry and Welding Production”</p><p>Novokuznetsk, Kemerovo Region</p></bio><email xlink:type="simple">shefn1200@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Усольцев</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Usol’tsev</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.т.н., доцент кафедры материаловедения, литейного и сварочного производства</p><p>654007, Кемеровская обл., Новокузнецк, ул. Кирова, 42</p></bio><bio xml:lang="en"><p>Cand. Sci. (Eng.), Assist. Professor of the Chair “Materials, Foundry and Welding Production”</p><p>Novokuznetsk, Kemerovo Region</p></bio><email xlink:type="simple">a.us_@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Прудников</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Prudnikov</surname><given-names>A. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д.т.н., профессор кафедры материаловедения, литейного и сварочного производства</p><p>654007, Кемеровская обл., Новокузнецк, ул. Кирова, 42</p></bio><bio xml:lang="en"><p>Dr. Sci. (Eng.), Professor of the Chair “Materials, Foundry and Welding Production”</p><p>Novokuznetsk, Kemerovo Region</p></bio><email xlink:type="simple">a.prudnikov@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бащенко</surname><given-names>Л. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Bashchenko</surname><given-names>L. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.т.н., доцент кафедры теплоэнергетики и экологии</p><p>654007, Кемеровская обл., Новокузнецк, ул. Кирова, 42</p></bio><bio xml:lang="en"><p>Cand. Sci. (Eng.), Assist. Professor of the Chair “Thermal Power and Ecology”</p><p>Novokuznetsk, Kemerovo Region</p></bio><email xlink:type="simple">luda.baschenko@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Сибирский государственный индустриальный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Siberian State Industrial University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>01</day><month>07</month><year>2020</year></pub-date><volume>63</volume><issue>5</issue><fpage>305</fpage><lpage>312</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Козырев Н.А., Шевченко Р.А., Усольцев А.А., Прудников А.Н., Бащенко Л.П., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Козырев Н.А., Шевченко Р.А., Усольцев А.А., Прудников А.Н., Бащенко Л.П.</copyright-holder><copyright-holder xml:lang="en">Kozyrev N.A., Shevchenko R.A., Usol’tsev A.A., Prudnikov A.N., Bashchenko L.P.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://fermet.misis.ru/jour/article/view/1890">https://fermet.misis.ru/jour/article/view/1890</self-uri><abstract><p>Исследованы процессы сварки с последующим управляемым охлаждением полнопрофильных рельсовых стыков, проводимым путем пропускания импульсов переменного электрического тока после сварки. Изучено влияние режимов сварки на качественные показатели сварного стыка. Сварку проводили на машине для контактной стыковой сварки МСР-6301 в условиях рельсосварочного предприятия ООО «РСП-М» (РСП-29). Для исследования вырезали образцы полнопрофильных рельсов типа Р65 категории ДТ350 длиной 600 мм. Управление режимами изотермической выдержки после сварки осуществляли с помощью персонального компьютера с изменением программы промышленного контроллера SIMATIC S7–300 и программного обеспечения Simatic Step 7, позволяющего задавать режимы управляемого охлаждения. Управляющая программа написана на графическом языке LAD. Для поиска оптимальных режимов управляемого охлаждения проведен полный факторный эксперимент N = 2k. Испытаны нетермообработанные стыки на трехточечный статический изгиб согласно СТО РЖД 1.08.002 – 2009 «Рельсы железнодорожные, сваренные электроконтактным способом». Испытания на статический изгиб проводили на прессе типа ПМС-320. Определены значения усилия, возникающего при изгибе Pизг, и величина стрелы прогиба fпр, при которых происходит разрушение контрольного образца или максимальные значения этих показателей, если образец не разрушился во время испытаний. В ходе экспериментов получены регрессионные модели для выходных параметров усилия при изгибе и стрелы прогиба. Изучена макроструктура образцов и распределение твердости металла на поверхности катания сварного стыка рельсов. Разработан новый способ контактной стыковой сварки, который позволяет получать сварное соединение рельсов типа Р65 категории ДТ350 со свойствами, превосходящими технические требования СТО РЖД 1.08.002 – 2009.</p></abstract><trans-abstract xml:lang="en"><p>The article describes the study of welding processes with the subsequent control of cooling of full-profile rail joints, produced by passing alternating electric current pulses after welding. The influence of welding modes on the quality of welded joint was investigated. Welding was carried out on a resistance butt welding machine MCP-6301 in conditions of the rail welding company LLC “RSP-M” (RSP-29). For research, the samples of P65 type full-profile rails of DT350 category 600 mm long were cut out. The isothermal holding conditions after welding were controlled using a personal computer with a change in the program of the SIMATIC S7-300 industrial controller and the software SIMATIC STEP 7, which allows modes of controlled cooling to be set. The control program was written in the LAD graphic language. To search for optimal modes of controlled cooling, a complete factor experiment N = 2k was carried out. Non-heat-treated joints were tested for three-point static bending according to the state standard STO RZD 1.08.002 – 2009 “Railway rails, welded by electric contact method”. Static bending tests were carried out on the press of PMS-320 type. Values of the force arising during bending Pbend and the bend deflection fpr at which the control sample is destroyed, were determined, as well as maximum values of these indicators if the sample was not destroyed during the tests. During the experiments, regression models were obtained for output parameters of the bending force and bend deflection. Macrostructure of the samples and distribution of the metal hardness on rolling surface of the rails welded joint were studied. A new method of resistance butt welding was developed, which makes it possible to obtain a welded connection of P65 type rails of DT350 category with properties that exceed the technical requirements of the mentioned state standard.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>рельсы</kwd><kwd>контактная сварка</kwd><kwd>термическая обработка</kwd><kwd>ток</kwd><kwd>импульс</kwd><kwd>режим сварки</kwd><kwd>твердость</kwd><kwd>зона термического влияния</kwd></kwd-group><kwd-group xml:lang="en"><kwd>rails</kwd><kwd>resistance welding</kwd><kwd>heat treatment</kwd><kwd>current</kwd><kwd>impulse</kwd><kwd>w ing mode</kwd><kwd>hardness</kwd><kwd>heat affected zone</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке РФФИ и Кемеровской области в рамках научного проекта № 20-48-420003 р_а «Развитие физико-химических и технологических основ создания принципиально нового способа сварки дифференцированно термоупрочненных железнодорожных рельсов».</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Meade B. Railroad welding demands specialized processes // Welding Journal. 1997. Vol. 76. No. 9. P. 47 – 52.</mixed-citation><mixed-citation xml:lang="en">Meade B. Railroad welding demands specialized processes. Welding Journal. 1997, vol. 76, no. 9, pp. 47–52.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Kargin V.A., Tikhomirova L.B., Abramov A.D., Galai M.S. Effect of vibroimpact treatment on the physical and mechanical properties of the surface layer of welded joints in rails // Welding International. 2014. Vol. 28. No. 3. P. 245 – 247.</mixed-citation><mixed-citation xml:lang="en">Kargin V.A., Tikhomirova L.B., Abramov A.D., Galai M.S. Effect of vibroimpact treatment on the physical and mechanical properties of the surface layer of welded joints in rails. Welding International. 2014, vol. 28, no. 3, pp. 245–247.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Yamamoto R., Komizu Y., Fukada Y. Experimental examination for understanding of transition behaviour of oxide inclusions on gas pressure weld interface: joining phenomena of gas pressure welding // Welding International. 2014. Vol. 28. No. 7. P. 510 – 520.</mixed-citation><mixed-citation xml:lang="en">Yamamoto R., Komizu Y., Fukada Y. Experimental examination for understanding of transition behaviour of oxide inclusions on gas pressure weld interface: joining phenomena of gas pressure welding. Welding International. 2014, vol. 28, no. 7, pp. 510–520.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Karimine K., Uchino K., Okamura M. Susceptibility to and occurrence of HAZ liquation cracking in rail steels: Study of rail welding with high-C welding materials (4 th Report) // Welding International. 1997. Vol. 11. No. 6. P. 452 – 461.</mixed-citation><mixed-citation xml:lang="en">Karimine K., Uchino K., Okamura M. Susceptibility to and occurrence of HAZ liquation cracking in rail steels: Study of rail welding with high-C welding materials (4 th Report). Welding International. 1997, vol. 11, no. 6, pp. 452–461.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Kuchuk-Yatsenko S.I., Shvets Yu.V., Didkovskii A.V., Chvertko P.N., Shvets V.I., Mikitin Ya.I. Technology and equipment for resistance flash welding of railway crossings with rail ends through an austenitic insert // Welding International. 2008. Vol. 22. No. 5. P. 338 – 341.</mixed-citation><mixed-citation xml:lang="en">Kuchuk-Yatsenko S.I., Shvets Yu.V., Didkovskii A.V., Chvertko P.N., Shvets V.I., Mikitin Ya.I. Technology and equipment for resistance flash welding of railway crossings with rail ends through an austenitic insert. Welding International. 2008, vol. 22, no. 5, pp. 338–341.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Irving B. Long Island Rail Road orders an all-welded fleet // Welding Journal. 1997. Vol. 22. No. 9. P. 33 – 37.</mixed-citation><mixed-citation xml:lang="en">Irving B. Long Island Rail Road orders an all-welded fleet. Welding Journal. 1997, vol. 22, no. 9, pp. 33–37.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Клименко Л.B. Бесстыковой путь – прогрессивная конструкция железнодорожного пути // Приложение к журналу «Мир транспорта» МКЖТ МПС РФ. 2004. № 1. C. 88 – 93.</mixed-citation><mixed-citation xml:lang="en">Klimenko L.B. Continuous rail – a progressive rail construction. Prilozhenie k zhurnalu “Mir transporta” MKZhT MPS RF. 2004, no. 1, pp. 88–93. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Калашников Е.А., Королев Ю.А. Технологии сварки рельсов: тенденции в России и за рубежом // Путь и путевое хозяйство. 2015. № 8. C. 2 – 6.</mixed-citation><mixed-citation xml:lang="en">Kalashnikov E.A., Korolev Yu.A. Rail welding technology: trends in Russia and abroad. Put’ i putevoe khozyaistvo. 2015, no. 8, pp. 2–6. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Sergejevs D., Mikhaylovs S. Analysis of factors affecting fractures of rails welded by alumino-thermic welding // Transport Problems. 2008. Vol. 3. P. 33 – 37.</mixed-citation><mixed-citation xml:lang="en">Sergejevs D., Mikhaylovs S. Analysis of factors affecting fractures of rails welded by alumino-thermic welding. Transport Problems. 2008, vol. 3, pp. 33–37.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Mitsuru F., Hiroaki N., Kiyoshi N. Rail flash-butt welding technology // JFE Technical Report. 2015. No. 20. P. 159 – 163.</mixed-citation><mixed-citation xml:lang="en">Mitsuru F., Hiroaki N., Kiyoshi N. Rail flash-butt welding technology. JFE Technical Report. 2015, no. 20, pp. 159–163.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Saita K., Karimine K., Ueda M., Iwano K., Yamamoto T., Hiroguchi K. Trends in rail welding technologies and our future approach // Nippon Steel &amp; Sumitomo Metal Technical Report. 2013. No. 105. P. 84 – 92.</mixed-citation><mixed-citation xml:lang="en">Saita K., Karimine K., Ueda M., Iwano K., Yamamoto T., Hiroguchi K. Trends in rail welding technologies and our future approach. Nippon Steel &amp; Sumitomo Metal Technical Report. 2013, no. 105, pp. 84–92.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Dahl B., Mogard B., Gretoft B., Ulander B. Repair of rails on-site by welding // Svetsaren. 1995. Vol. 50. No. 2. P. 10 – 14.</mixed-citation><mixed-citation xml:lang="en">Dahl B., Mogard B., Gretoft B., Ulander B. Repair of rails on-site by welding. Svetsaren. 1995, vol. 50, no. 2, pp. 10–14.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Takimoto T. Latest welding technology for long rail and its reliability // Tetsu-to-Hagane. 1984. Vol. 70. No. 10. P. 40 – 45.</mixed-citation><mixed-citation xml:lang="en">Takimoto T. Latest welding technology for long rail and its reliability. Tetsu-to-Hagane. 1984, vol. 70, no. 10, pp. 40–45.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Tachikawa H., Uneta T., Nishimoto H. Steel welding technologies for civil construction applications // Nippon Steel Technical Report. 2000. Vol. 82. No. 7. P. 35 – 41.</mixed-citation><mixed-citation xml:lang="en">Tachikawa H., Uneta T., Nishimoto H. Steel welding technologies for civil construction applications. Nippon Steel Technical Report. 2000, vol. 82, no. 7, pp. 35–41.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Шур Е.А. Влияние структуры на эксплуатационную стойкость рельсов. – В кн.: Влияние свойств металлической матрицы на эксплуатационную стойкость рельсов. Материалы II Всерос. науч.-техн. семинара (Екатеринбург, 16-17 мая, 2006 г.). – Екатеринбург: изд. УИМ, 2006. С. 37 – 63.</mixed-citation><mixed-citation xml:lang="en">Shur E.A. Influence of the structure on operational stability of rails. In: Vliyanie svoistv metallicheskoi matritsy na ekspluatatsionnuyu stoikost’ rel’sov. Materialy II Vseros. Nauch.-tekhn. seminara (Ekaterinburg, 16-17 maya, 2006 g.) [Influence of the metal matrix properties on the operational stability of rails. Materials of the II All-Russian Sci. and Tech. Seminar (Ekaterinburg, May 16-17, 2006)]. Ekaterinburg: izd. UIM, 2006, pp. 37–63. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Weingrill L., Krutzler J., Enzinger N. Temperature field evolution during flash-butt welding of railway rails // Materials Science Forum. May 2016. Vol. 879. P. 2088 – 2093.</mixed-citation><mixed-citation xml:lang="en">Weingrill L., Krutzler J., Enzinger N. Temperature field evolution during flash-butt welding of railway rails. Materials Science Forum. May 2016, vol. 879, pp. 2088–2093.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Шур Е.А., Резанов В.А. Комплексный метод контактной сварки рельсов // Вестник ВНИИЖТ. 2012. № 3. С. 20 – 22. P. 338 – 341.</mixed-citation><mixed-citation xml:lang="en">Shur E.A., Rezanov V.A. Integrated method of resistance welding of rails. Vestnik VNIIZhT. 2012, no. 3, pp. 20–22. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Гудков А.В., Николин А.И., Турбина Л.А., Насонов Д.С., Аверкина В.А. Контактная сварка рельсов и термическая обработка сварных стыков рельсов современного производства на рельсосварочных предприятиях ОАО «РЖД». – В кн.: Сварочные и наплавочные технологии на железнодорожном транспорте. Сб. науч. тр. ОАО «ВНИИЖТ» / Под. ред. А.В. Гудкова. – М.: Интекст, 2008. С. 42 – 49.</mixed-citation><mixed-citation xml:lang="en">Gudkov A.V., Nikolin A.I., Turbina L.A., Nasonov D.S., Averkina V.A. Resistance welding of rails and heat treatment of welded joints of rails of modern production at rail welding enterprises of OJSC Russian Railways. In: Svarochnye i naplavochnye tekhnologii na zheleznodorozhnom transporte. Sb. nauch. tr. OAO “VNIIZhT” [Welding and surfacing technologies in railway transport. Coll. of sci. works of OJSC “VNIIZhT”]. Gudkov A.V. ed. Moscow: Intekst, 2008, pp. 42–49. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Shevchenko R.A., Kozyrev N.A., Kryukov R.E., Patrushev A.O., Usoltsev A.A. Multi-factor regression analysis of the process of rails contact welding on K1000 machine // Metallurgy 2017. IOP Publishing IOP Conf. Series: Materials Science and Engineering. 2018. Vol. 411. Article 012088.</mixed-citation><mixed-citation xml:lang="en">Shevchenko R.A., Kozyrev N.A., Kryukov R.E., Patrushev A.O., Usoltsev A.A. Multi-factor regression analysis of the process of rails contact welding on K1000 machine. Metallurgy 2017. IOP Publishing IOP Conf. Series: Materials Science and Engineering. 2018, vol. 411, article 012088.</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Пат. 2641586 РФ. МПК В 23 К 11/04. Способ контактной стыковой сварки рельсов / Е.В. Протопопов, Н.А. Козырев, Р.А. Шевченко, Р.Е. Крюков, С.В. Фейлер, А.А. Усольцев; заявл. 07.12.2016; опубл. 18.01.18. Бюл. № 2.</mixed-citation><mixed-citation xml:lang="en">Protopopov E.V., Kozyrev N.A., Shevchenko R.A., Kryukov R.E., Feiler S.V., Usol’tsev A.A. Sposob kontaktnoi stykovoi svarki rel’sov [Method for resistance butt welding of rails]. Patent RF no. 2641586. MPK V 23 K 11/04. Byulleten’ izobretenii. 2018, no. 2. (In Russ.).</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
