A study of the impact of low ambient temperatures on weld technology and the properties of welded joints in trunk pipelines

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Published Jun 30, 2017
N. G. Goncharov O. I. Kolesnikov A. A. Yushin O. I. Filippov

Abstract

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.

How to Cite

1.
Goncharov NG, Kolesnikov OI, Yushin AA, Filippov OI. A study of the impact of low ambient temperatures on weld technology and the properties of welded joints in trunk pipelines. PST [Internet]. 2017Jun.30 [cited 2020Aug.8];1(1):57-3. Available from: https://pipeline-science.com/index.php/PST/article/view/52

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Keywords

welding, welded joint, low temperatures, mechanical properties, thermal welding cycle, strain capacity, heat-affected zone, martensite.

Section
Original Work