Weldability of non-rotating pipe joints of a main gas pipeline in conditions of the north

Abstract

The paper focuses on the destruction specifics of main gas pipelines (MG) on welded joints and their relation to the technology of construction welding of non-rotating joints of pipes at temperatures of down to −35 … −50 °C in field environment. It is demonstrated that the metal of the heat-affected zone (HAZ) significantly softens under welding with specified values of qh (heat input), kJ/m, of the pipe joints of a gas pipeline in the conditions of the North. Herewith, in-service defects and cracks tend to appear in welded joints of pipes.