The effect of low temperature on the supermolecular structure of the material of welded joint in polymer pipes
https://doi.org/10.31242/2618-9712-2019-24-4-14
Abstract
The supramolecular structure of a welded joint of polypropylene pipes, made into a bell at positive and negative ambient temperatures, is investigated. The hypothesis put forward by the authors is confirmed that, regardless of the ambient temperature when welding polypropylene, the structure of the seam under the surface layer of the welded joint becomes spherical like that of the main polymer material. When welding polymeric materials at low ambient temperatures, the effect of conductive heat removal on the formation of the supramolecular structure of the heat-affected zone of the welded joint is especially pronounced due to the low coefficient of thermal conductivity. The structure of welded joints of polypropylene pipes was studied using a scanning electron microscope. It was shown that the nature and size of supermolecular formations in the structure of welded joints made in the open air at a temperature of –30 °C according to the welding technology developed and patented in the Institute of oil and gas problems SB RAS are identical with the structure obtained at positive ambient temperatures. It is shown that in the heat affected zone of the welded joint of polypropylene pipes, welded even at about 0 °C, regions with a destructured supermolecular structure found. The directions of further research are given.
Keywords
welding with heated tool into the socket,
polypropylene pipe,
conductive heat removal,
supermolecular structure,
adjoining zone,
heat affected zone,
low ambient temperature
Supporting agencies: The work has been accomplished within the framework of the State Order of the Ministry of Science and Higher Education of the Russian Federation (No. 0377-2018-0001)
About the Authors
Aleksandr Innokentevich Gerasimov
Institute of Oil and Gas Problems SB RAS
Russian Federation
Russian Federation
Gerasimov Aleksandr Innokentevich, candidate of technical sciences, leading researcher, Institute of Oil and Gas Problems SB RAS, 20 Avtodorozhnaya st., Yakutsk, 677007, Russia, https://orcid.org/0000-0003-4114-9955, gerasimov2509@rambler.ru;
Gleb Vladimirovich Botvin
Institute of Oil and Gas Problems SB RAS
Russian Federation
Russian Federation
Botvin Gleb Vladimirovich, leading engineer, Institute of Oil and Gas Problems SB RAS, 20 Avtodorozhnaya st., Yakutsk, 677007, Russia, https://orcid.org/0000-0001-7834-8144, gleb-0379@mail.ru
Elena Viktorovna Danzanova
Institute of Oil and Gas Problems SB RAS
Russian Federation
Russian Federation
Danzanova Elena Viktorovna, candidate of technical sciences, senior researcher, Institute of Oil and Gas Problems SB RAS, 20 Avtodorozhnaya st., Yakutsk, 677007, Russia, https://orcid.org/0000-0002-3445-0961, dhv4071@mail.ru.
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Review
For citations:
Gerasimov A.I., Botvin G.V., Danzanova E.V. The effect of low temperature on the supermolecular structure of the material of welded joint in polymer pipes. Arctic and Subarctic Natural Resources. 2019;24(4):152-160. (In Russ.) https://doi.org/10.31242/2618-9712-2019-24-4-14
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