At low temperatures the operating capability of welded joints in pipe steels deteriorates: hardness and ultimate tensile strength increase; ductility and impact toughness decrease. The implementation of welding technologies at low temperatures requires additional measures. This article presents the results of research into solutions to the problem of reliability enhancement in welded joints, operating at low temperatures, in the JSC Transneft pipeline system in the Far North of the Russian Federation.
As a result of this work, revised temperatures and their rates of change have been established and substantiated, in the form of optimized thermal welding cycles. It has been found that the properties required of welded joints are ensured by achieving a specific structure, eliminating the martensite component. Numerical values for the cooling rate are substantiated within the martensite-decomposition temperature range.
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welding, welded joint, low temperatures, mechanical properties, thermal welding cycle, strain capacity, heat-affected zone, martensite.
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