AUTHORS: Dmitriy A. Neganov, Evgeniy P. Studenov, Oleg I. Kolesnikov, Nikolay G. Goncharov, Aleksey A. Yushin

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ABSTRACT: The article deals with the current welding issues of pipeline construction in the Far North of Russia in order to provide solutions to ensure their operational reliability and environmental safety, as well as to reduce any risks associated with the destruction of welded joints. Based on the analysis of the results of experimental studies of the pipe joint welding thermal cycles, metal-physical studies, and calculation methods, the article provides the materials on the development of additional requirements for welding technology at low temperatures in the Far North, when metals lose their viscosity and plastic properties and become prone to hot and cold cracking. It was found that the choice of the optimal weld thermal cycle allows achieving high mechanical performance of metal near any welded joints and also provides for the high metallurgical quality of the weld metal. The presented results of scientific research aimed at the reliability improvement of the welded joints of the PJSC Transneft’s pipeline system at low temperatures in the Far North were used in the development of regulatory documentation for welding technology.

KEYWORDS: welding, welded joint, crack resistance, low temperatures, heat-affected zone, weld thermal cycle, strain capacity, cold cracks.

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