Keyword: «delayed failure.»

INFLUENCE OF THE STRUCTURAL STATE OF THE METAL OF RING WELDING SEAMS OF PIPELINE STEEL ON DEFORMATION PROCESSES AND FRACTURED DEGRADATION DURING OPERATION OF UNDERGROUND GAS PIPELINES

In this work, the influence of the structural state of the ZTV metal of 09G2S pipe steel after welding and heat treatment on the deformation processes during the delayed destruction of an above-ground pipeline under the influence of seasonal soil deformations in the permafrost zone was studied. The influence of the restructuring of the ZTV metal structure from post-welding heat treatment on the strength and ductility characteristics was examined. The deformation and fracture processes during three-point bending were recorded using acoustic emission.

Keywords: strength, welding, plasticity, acoustic emission, heat treatment, delayed failure.