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<p>The paper presents the study of the fatigue strength of smooth specimens of welded joints made of G105 and AISI 4340 steels used for high-strength drill pipes. Fatigue test specimens with a diameter of 5&#xa0;mm were produced by electrical discharge cutting from tubular blanks with a diameter of 73&#xa0;mm and a wall thickness of 9&#xa0;mm, joined by rotary friction welding (RFW). Fatigue tests of specimens with a welded joint were carried out in comparison with specimens of the base steel G105. The effect of the RFW parameter (the friction force) and post-weld tempering at 550&#xa0;°C on the fatigue limit and the mechanism of fracture of specimens in comparison with the distribution of residual stresses was studied. Taking into account statistical processing, it is shown that regardless of the friction force and the effect of post-weld tempering, the fatigue limit of all series of samples has values close to the fatigue limit of the base steel G 105. At the same time, 33 of 36 tested samples of welded joints in the initial state and 16 of 18 tested samples after tempering have failure in the zone of the base steel G105. Fractographic and microstructural features of the fatigue failure zone in different sections are shown. It is established that the resistance to the initiation and growth of a fatigue crack in different sections of the sample is the same, which depends on the ratio of the proportion of deformed grains observed on EBSD-recrystallization maps, volume and morphology of carbide precipitates. This indicates a predominantly equal strength of the sample with a welded joint with the base steel G105 under fatigue loading. The obtained results suggest the possibility of designing a drill pipe without an upset part in the weld zone, which is characterized by lower metal consumption and manufacturing cost.</p>

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Fatigue Behavior of Welded Joints of High-Strength Drill Pipes Obtained by Rotary Friction Welding

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Artem Atamashkin,
  • Elena Priymak,
  • Yaroslav Syomka,
  • Egor Tulibaev,
  • Vladimir Trushov,
  • Valeria Veselova,
  • Evgeniia Putilova

摘要

The paper presents the study of the fatigue strength of smooth specimens of welded joints made of G105 and AISI 4340 steels used for high-strength drill pipes. Fatigue test specimens with a diameter of 5 mm were produced by electrical discharge cutting from tubular blanks with a diameter of 73 mm and a wall thickness of 9 mm, joined by rotary friction welding (RFW). Fatigue tests of specimens with a welded joint were carried out in comparison with specimens of the base steel G105. The effect of the RFW parameter (the friction force) and post-weld tempering at 550 °C on the fatigue limit and the mechanism of fracture of specimens in comparison with the distribution of residual stresses was studied. Taking into account statistical processing, it is shown that regardless of the friction force and the effect of post-weld tempering, the fatigue limit of all series of samples has values close to the fatigue limit of the base steel G 105. At the same time, 33 of 36 tested samples of welded joints in the initial state and 16 of 18 tested samples after tempering have failure in the zone of the base steel G105. Fractographic and microstructural features of the fatigue failure zone in different sections are shown. It is established that the resistance to the initiation and growth of a fatigue crack in different sections of the sample is the same, which depends on the ratio of the proportion of deformed grains observed on EBSD-recrystallization maps, volume and morphology of carbide precipitates. This indicates a predominantly equal strength of the sample with a welded joint with the base steel G105 under fatigue loading. The obtained results suggest the possibility of designing a drill pipe without an upset part in the weld zone, which is characterized by lower metal consumption and manufacturing cost.