Atamashkin A.S., Priymak E.Y., Isaeva A.V., Tulibaev E.S., Semka Y.S. Fatigue Strength of Welded Joints of High-Strength Drill Pipes

DOI: 10.18503/1995-2732-2025-23-3-129-140

Abstract

The fatigue behavior of welded joints of drill pipes obtained by rotary friction welding from 32G2, 32KhGМА (pipe body) and 40KhN2MA (tool joint part) steels in the state after welding and after tempering at a temperature of 550°C. Fatigue tests were carried out on cylindrical samples with a welded joint with a two-support mounting of a rotating sample with alternating bending with rotation, which made it possible to identify the weakest zone in the sample. The obtained values of the endurance limit of welded joints were compared with the values of the endurance limit of solid samples from the 32G2 and 32KhGМА base steels of the drill pipe body. It was found that the welded joint of 32G2-40KhN2MA steels is inferior in endurance to the base steel 32G2 by 15% in the initial state and by 28% after tempering, while the welded joint of 32KhGМА-40KhN2MA steels has fatigue strength both in the initial state and after tempering, commensurate with the 32KhGМА base steel. The research results are supplemented by metallographic analysis of welded joints microstructure. Based on the research results using the EBSD analysis, microstructural features of vulnerable peripheral areas of the welding impact zone that control fatigue load resistance have been established.

Keywords

rotary friction welding, medium carbon steels, welded joint, thermo-mechanicaly affected zone, fatigue strength, endurance limit.

For citation

Atamashkin A.S., Priymak E.Y., Isaeva A.V., Tulibaev E.S., Semka Y.S. Fatigue Strength of Welded Joints of High-Strength Drill Pipes. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2025, vol. 23, no. 3, pp. 129-140. https://doi.org/10.18503/1995-2732-2025-23-3-129-140

Artem S. Atamashkin – PhD (Eng.), Senior Researcher at the Research and Educational Center for New Materials and Advanced Technologies, Orenburg State University, Orenburg, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0003-3727-8738

Elena Y. Priymak – PhD (Eng.), Senior Researcher at the Research and Educational Center for New Materials and Advanced Technologies, Orenburg State University, Orenburg, Russia; Head of the Laboratory of Metal Science and Heat Treatment, ZBO Drill Industries, Orenburg, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0002-4571-2410

Anna V. Isaeva – PhD (Eng.), Associate Professor of the Department of Industrial Technologies for Materials Processing, Orenburg State University, Orenburg, Russia; Leading Metallurgical Engineer, ZBO Drill Industries, Orenburg, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0002-1050-3504

Egor S. Tulibaev – Chief Designer, ZBO Drill Industries, Orenburg, Russia; Senior Lecturer of Department of Mechanics of Materials, Structures and Machines, Orenburg State University, Orenburg, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

Yaroslav S. Semka – Postgraduate Student of the Department of Industrial Technologies for Materials Processing, Orenburg State University, Orenburg, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

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Details: Published: 29 September 2025; Last Updated: 29 September 2025; Hits: 170