Effect of weld faying part groove shape on reduction of inner flash in steel pipe joints fabricated by friction welding

  • M. KimuraEmail author
  • S. Iwamoto
  • M. Kusaka
  • K. Kaizu
  • Y. Nakatani
  • M. Takahashi


The groove shape of the weld faying part was investigated to obtain an ideal pipe friction-welded joint that had a fracture in the base metal and no inner flash of it. The steel pipe had inner and outer diameters of 8.0 mm and 13.5 mm, respectively, and the weld faying surface was of a basic flat shape (butt) type. Moreover, stepped and tapered groove shapes were prepared. Pipe groove shapes were welded with a friction speed of 27.5 s−1 and a friction load of 2.79 kN. Joining phenomena during the welding process were observed, and the tensile strength of joints was evaluated. The joints, that fabricated with flat or step groove shapes, made with a friction time at which the friction torque reached the initial peak did not have the tensile strength of the base metal nor a fracture in the base metal. However, the joints fabricated with a friction time that reached past the initial peak had a large flash, and they contained a fracture in the base metal. In contrast, when joints were made with a gently tapered groove shape with a friction time reaching the time of the initial peak, they achieved a fracture in the base metal, despite having an extremely small inner flash. Therefore, the shape at the weld faying part was capable of reducing the flash exhausted from the weld interface.


Friction welding Steel pipe Inner flash Groove shape Taper Joint strength Fracture 



The authors wish to thank the staff members of the Machine and Workshop Engineering at the Graduate School of Engineering, University of Hyogo. We also wish to thank the alumnus Mr. Naoya Hashimoto at the University of Hyogo for his devoted contributions to this research project. Additionally, we wish to thank Mr. Shigekazu Miyashita from the Toshiba Energy Systems & Solutions Corporation for his kind and persisting assistance provided to this study.


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Copyright information

© Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • M. Kimura
    • 1
    Email author
  • S. Iwamoto
    • 1
  • M. Kusaka
    • 1
  • K. Kaizu
    • 1
  • Y. Nakatani
    • 2
  • M. Takahashi
    • 3
  1. 1.Department of Mechanical Engineering, Graduate School of EngineeringUniversity of HyogoHimejiJapan
  2. 2.Toshiba Energy Systems & Solutions CorporationYokohamaJapan
  3. 3.Department of Mechanical Engineering, Faculty of EngineeringNishinippon Institute of TechnologyMiyako-gunJapan

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