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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">resar</journal-id><journal-title-group><journal-title xml:lang="ru">Природные ресурсы Арктики и Субарктики</journal-title><trans-title-group xml:lang="en"><trans-title>Arctic and Subarctic Natural Resources</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2618-9712</issn><issn pub-type="epub">2686-9683</issn><publisher><publisher-name>Академия наук Республики Саха (Якутия)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.31242/2618-9712-2019-24-4-13</article-id><article-id custom-type="elpub" pub-id-type="custom">resar-505</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>Металлургия и материаловедение. Материаловедение</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Metallurgy and materials science. Materials science</subject></subj-group></article-categories><title-group><article-title>Регулирование теплового процесса при электромуфтовой сварке полиэтиленовых труб при низких температурах</article-title><trans-title-group xml:lang="en"><trans-title>Thermal process control during electrofusion welding of polyethylene pipes at low temperatures</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5686-1817</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Старостин</surname><given-names>Николай Павлович</given-names></name><name name-style="western" xml:lang="en"><surname>Starostin</surname><given-names>Nikolai Pavlovich</given-names></name></name-alternatives><bio xml:lang="ru"><p>Старостин Николай Павлович, доктор технических наук, профессор, заведующий лабораторией, Институт проблем нефти и газа СО РАН, 677980, Якутск, ул. Автодорожная, д. 20, Россия, https://orcid.org/0000-0002-5686-1817, nikstar56@mail.ru;</p></bio><bio xml:lang="en"><p>Starostin Nikolai Pavlovich, doctor of technical sciences, professor, head of laboratory, Institute of Oil and Gas Problems SB RAS, 20 Avtodorozhnaya st., Yakutsk, 677980, Russia, https://orcid.org/0000-0002-5686-1817, nikstar56@mail.ru</p></bio><email xlink:type="simple">nikstar56@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3551-0417</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Аммосова</surname><given-names>Ольга Александровна</given-names></name><name name-style="western" xml:lang="en"><surname>Ammosova</surname><given-names>Olga Aleksandrovna</given-names></name></name-alternatives><bio xml:lang="ru"><p>Аммосова Ольга Александровна, кандидат технических наук, старший научный сотрудник, Институт проблем нефти и газа СО РАН, 677980, Якутск, ул. Автодорожная, д. 20, Россия https://orcid.org/0000-0003-3551-0417, ammosova_o@mail.ru</p></bio><bio xml:lang="en"><p>Ammosova Olga Aleksandrovna, Candidate of Technical Sciences, Senior Researcher, Institute of Oil and Gas Problems SB RAS, 20 Avtodorozhnaya st., Yakutsk, 677980, Russia, https://orcid.org/0000-0003-3551-0417, ammosova_o@mail.ru</p></bio><email xlink:type="simple">ammosova_o@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт проблем нефти и газа СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Oil and Gas Problems SB RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>05</day><month>11</month><year>2024</year></pub-date><volume>24</volume><issue>4</issue><fpage>143</fpage><lpage>151</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Старостин Н.П., Аммосова О.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Старостин Н.П., Аммосова О.А.</copyright-holder><copyright-holder xml:lang="en">Starostin N.P., Ammosova O.A.</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://resar.elpub.ru/jour/article/view/505">https://resar.elpub.ru/jour/article/view/505</self-uri><abstract><p>На основе математического моделирования теоретически исследуется тепловой процесс при электромуфтовой сварке полиэтиленовых труб для газопроводов соединительными муфтами с закладными нагревательными элементами. Исследуется влияние температуры окружающего воздуха на динамику температурного поля при электромуфтовой сварке полиэтиленовых труб. Математическая модель теплового процесса сварки учитывает геометрические размеры, теплофизические свойства материала свариваемых труб и муфты, температуру окружающего воздуха, скрытую теплоту фазового превращения полиэтилена, напряжение, подаваемое на закладной нагреватель. Приводятся результаты численного расчета теплового процесса сварки при различных температурах окружающего воздуха. Разработана методика определения параметров электромуфтовой сварки полиэтиленовых труб, обеспечивающих протекание теплового процесса при низких температурах окружающего воздуха по закономерностям, свойственным при сварке при допустимых температурах. Показано, что для обеспечения допустимой динамики температурного поля при температурах воздуха ниже нормативных, необходимо предварительно перед сваркой подогреть муфту и свариваемые участки труб. Предварительный подогрев осуществляется вмонтированным штатным нагревателем. Для снижения скорости охлаждения сварного муфтового соединения предлагается использование слоя теплоизоляции. Приведены рекомендуемые технологические параметры электромуфтовой сварки для труб ПЭ 80 ГАЗ SDR 11 63×5,8 при температурах воздуха ниже нормативных.</p></abstract><trans-abstract xml:lang="en"><p>The thermal process during electrofusion welding of polyethylene pipes for gas pipelines by connecting couplings with embedded heater is theoretically investigated on the basis of mathematical modeling. The influence of ambient temperature on the dynamics of the temperature field in the electrofusion welding of polyethylene pipes is investigated. The mathematical model of the thermal welding process considers geometric dimensions, thermophysical properties of welded pipes and coupling material, ambient temperature, latent heat of polyethylene phase transition, voltage applied to embedded heater. Results of numerical calculation of thermal welding process at various ambient temperatures are presented. Methodology has been developed for determining the parameters of electrofusion welding of polyethylene pipes, ensuring the flow of thermal process at low ambient temperatures according to the laws inherent in welding at permissible temperatures. It is shown that in order to ensure acceptable dynamics of the temperature field at air temperatures below standard, it is necessary to preheat the coupling and sections of pipes before welding. Preheating is carried out by standard embedded heater. The use of thermal insulation layer is proposed in order to reduce cooling rate of the welded coupling. Recommended technological parameters of electrofusion welding are given for pipes PE 80 GAZ SDR 11 63×5.8 at air temperatures below standard.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>математическая модель</kwd><kwd>температура</kwd><kwd>расчет</kwd><kwd>метод конечных разностей</kwd><kwd>управление</kwd><kwd>тепловой процесс</kwd><kwd>электромуфтовая сварка</kwd><kwd>предварительный подогрев</kwd><kwd>охлаждение</kwd><kwd>фазовый переход</kwd><kwd>оплавление</kwd><kwd>кристаллизация</kwd><kwd>теплоизоляция</kwd></kwd-group><kwd-group xml:lang="en"><kwd>mathematical model</kwd><kwd>temperature</kwd><kwd>calculation</kwd><kwd>finite difference method</kwd><kwd>control</kwd><kwd>heat process</kwd><kwd>electrofusion welding</kwd><kwd>preheating</kwd><kwd>cooling</kwd><kwd>phase transition</kwd><kwd>reflow</kwd><kwd>crystallization</kwd><kwd>thermal insulation</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках Госзаказа ФАНО РФ (проект № АААА-А17117040710038-8 от 07.04.2017 г.</funding-statement><funding-statement xml:lang="en">The research was carried out within the state assignment of FASO of Russia (pro- ject No. AAAA-A17-117040710038-8 of 04/07/2017.</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">Боровский Б.И., Кунский М.О. 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