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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">zurniimtpe</journal-id><journal-title-group><journal-title xml:lang="ru">Медицина труда и промышленная экология</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Journal of Occupational Health and Industrial Ecology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1026-9428</issn><issn pub-type="epub">2618-8945</issn><publisher><publisher-name>FSBSI “Izmerov Research Institute of Occupational Health”</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.31089/1026-9428-2022-62-7-480-484</article-id><article-id custom-type="elpub" pub-id-type="custom">zurniimtpe-2998</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>КРАТКИЕ СООБЩЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>BRIEF REPORTS</subject></subj-group></article-categories><title-group><article-title>Магнитные поля на рабочих местах при эксплуатации установок контактной точечной сварки</article-title><trans-title-group xml:lang="en"><trans-title>Magnetic fields in the workplace during the operation of contact spot welding installations</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8314-2044</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Никитина</surname><given-names>Валентина Николаевна</given-names></name><name name-style="western" xml:lang="en"><surname>Nikitina</surname><given-names>Valentina N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Заведующая отделением изучения электромагнитных излучений ФБУН «Северо-Западный научный центр гигиены и общественного здоровья», доктор медицинских наук.</p><p>e-mail: v.nikitinа@s-znc.ru</p></bio><bio xml:lang="en"><p>The Head of the Department for the study of electromagnetic radiation, North-Western Scientific Center for Hygiene and Public Health, Dr. of Sci. (Med.).</p><p>e-mail: v.nikitinа@s-znc.ru</p></bio><email xlink:type="simple">v.nikitina@s-znc.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/0000-0001-9475-0176</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Калинина</surname><given-names>Н. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Kalinina</surname><given-names>Nina I.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.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/0000-0002-4832-769X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ляшко</surname><given-names>Г. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Lyashko</surname><given-names>Galina G.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.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/0000-0003-4235-378X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дубровская</surname><given-names>Е. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Dubrovskaya</surname><given-names>Ekaterina N.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.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/0000-0002-8141-7179</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Плеханов</surname><given-names>В. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Plekhanov</surname><given-names>Vladimir P.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФБУН «Северо-Западный научный центр гигиены и общественного здоровья» Роспотребнадзора</institution><country>Россия</country></aff><aff xml:lang="en"><institution>North-West Public Health Research Center</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>31</day><month>08</month><year>2022</year></pub-date><volume>62</volume><issue>7</issue><fpage>480</fpage><lpage>484</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Никитина В.Н., Калинина Н.И., Ляшко Г.Г., Дубровская Е.Н., Плеханов В.П., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Никитина В.Н., Калинина Н.И., Ляшко Г.Г., Дубровская Е.Н., Плеханов В.П.</copyright-holder><copyright-holder xml:lang="en">Nikitina V.N., Kalinina N.I., Lyashko G.G., Dubrovskaya E.N., Plekhanov V.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://www.journal-irioh.ru/jour/article/view/2998">https://www.journal-irioh.ru/jour/article/view/2998</self-uri><abstract><p>Контактная сварка является одним из самых распространённых видов сварки. По технологическому способу получения соединений контактная сварка может быть точечной, рельефной, стыковой, шовной. Точечная контактная сварка отличается высокой производительностью и применяется гораздо чаще, чем другие виды сварки. Образование неразъёмных соединений материалов происходит в результате нагрева электрическим током и деформирования при сжатии. Разогрев изделия производится импульсами переменного, постоянного или униполярного тока промышленной частоты 50 Гц. На рабочем месте сварщика регистрируются неблагоприятные факторы, оказывающие влияние на здоровье — высокая температура, брызги и пары металлов, импульсные магнитные поля (ИМП) промышленной частоты 50 Гц.</p><p>Цель исследования — изучение уровней импульсных магнитных полей промышленной частоты 50 Гц на рабочих местах при эксплуатации установок контактной точечной сварки.</p><p>Исследование включало изучение технологии контактной точечной сварки, проведение инструментальных измерений и гигиеническую оценку уровней ИМП промышленной частоты 50 Гц на рабочих местах сварщиков при эксплуатации оборудования в штатном режиме. Инструментальные измерения уровней ИМП выполнены миллитесламетром ТП2-2У при эксплуатации трех моделей сварочных полуавтоматов на базе установок точечной сварки. Измеренные уровни индукции магнитных полей пересчитывались на максимальный рабочий ток (Imax), возможный при технологическом процессе.</p><p>Инструментальные измерения показали, что напряжённость магнитного поля на рабочих местах сварщиков зависела от типа установки, расстояния от источника излучения, локализации воздействия, сварки конкретных изделий. Наибольшие уровни магнитных полей были зарегистрированы в области руки и составляли от 1096,0 до 5512,0 А/м. При максимальном рабочем токе напряжённость магнитного поля может достигать 13 678,0–11 024,0 А/м.</p><p>Исследование показало, что интенсивность импульсных магнитных полей промышленной частоты 50 Гц на рабочих местах может превышать предельно допустимые уровни. Для защиты работников требуется ограничение времени воздействия магнитных полей.</p><sec><title>Ограничения исследования</title><p>Ограничения исследования. Исследования носят предварительный характер и имеют ограничения по объёму исследования.</p></sec><sec><title>Участие авторов</title><p>Участие авторов:Никитина В.Н. — концепция и дизайн исследования, написание текста;Калинина Н.И. — сбор и обработка данных, редактирование;Ляшко Г.Г. — сбор и обработка данных, редактирование;Дубровская Е.Н. — сбор и обработка данных, редактирование;Плеханов В.П. — сбор и обработка данных.</p></sec><sec><title>Финансирование</title><p>Финансирование. Исследование не имело спонсорской поддержки.</p></sec><sec><title>Конфликт интересов</title><p>Конфликт интересов. Авторы заявляют об отсутствии конфликта интересов.</p></sec><sec><title>Дата поступления</title><p>Дата поступления: 07.07.2022 / Дата принятия к печати: 15.07.2022 / Дата публикации: 15.08.2022</p></sec></abstract><trans-abstract xml:lang="en"><p>Contact welding is one of the most common types of welding. According to the technological method of obtaining joints, contact welding can be spot, relief, butt, suture. Spot contact welding a high productivity. Specialists use spot welding more often than other types of welding. The formation of permanent joints of materials occurs as a result of electric heating and deformation during compression. Workers warm up the products with pulses of alternating, direct or unipolar current of industrial frequency 50 Hz. Researchers have registered adverse factors at the welder's workplace that have an impact on health. These are high temperature, splashes and metal vapors, pulsed magnetic fields (PMF) of industrial frequency 50 Hz.</p><p>The study aims to explore the levels of pulsed magnetic fields of industrial frequency of 50 Hz at workplaces during the operation of contact spot welding installations.</p><p>The study included the study of the technology of contact spot welding, instrumental measurements and hygienic assessment of the levels of PMF of the industrial frequency of 50 Hz at the welders' workplaces during the operation of equipment in normal mode. Specialists have performed instrumental measurements of PMF levels with a TP2-2U milliteslameter during operation of three models of semi-automatic welding machines based on spot welding installations. The researchers recalculated the measured levels of magnetic field induction to the maximum operating current (Imax) possible during the technological process.</p><p>Instrumental measurements showed that the magnetic field strength at the welders' workplaces depended on the type of installation, the distance from the radiation source, the localization of exposure, and welding of specific products. Experts registered the highest levels of magnetic fields in the arm area from 1096.0 to 5512.0 A/m. At the maximum operating current, the magnetic field strength can reach 13 678.0–11 024.0 A/m.</p><p>The study showed that the intensity of pulsed magnetic fields of industrial frequency 50 Hz in the workplace can exceed the maximum permissible levels. To protect workers, it is necessary to limit the time of exposure to magnetic fields.</p><sec><title>Limitations</title><p>Limitations. The studies are preliminary in nature and have limitations on the scope of the study.</p></sec><sec><title>Contribution</title><p>Contribution:Nikitina V.N. — concept and design of the study, writing the text;Kalinina N.I. — data collection and processing, editing;Lyashko G.G. — data collection and processing, editing;Dubrovskaya E.N. — data collection and processing, editing;Plekhanov V.P. — data collection and processing.</p></sec><sec><title>Funding</title><p>Funding. The study had no funding.</p></sec><sec><title>Conflict of interests</title><p>Conflict of interests. The authors declare no conflict of interests.</p></sec><sec><title>Received</title><p>Received: 07.07.2022 / Accepted: 15.07.2022 / Published: 15.08.2022</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>импульсные магнитные поля частотой 50 Гц</kwd><kwd>контактная точечная сварка</kwd><kwd>измерения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>pulsed magnetic fields with a frequency of 50 Hz</kwd><kwd>contact spot welding</kwd><kwd>measurements</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Брежнева А.Н., Яночкин В.А. Контактная сварка и её основные способы. Актуальные проблемы авиации и космонавтики. 2018; 1(14): 414-6.</mixed-citation><mixed-citation xml:lang="en">Brezhneva A.V., Yanochkin V.A. The contact welding and its main ways. 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