Development of a cobalt-based alloy FSW tool for high-softening-temperature materials

Yutaka S. Sato, Masahiro Miyake, Hiroyuki Kokawa, Toshihiro Omori, Kiyohito Ishida, Shinya Imano, Seung Hwan C. Park, Satoshi Hirano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

17 Citations (Scopus)


The authors have developed a new friction stir welding (FSW) tool that enables welding of high-softening-temperature materials, such as steels, and titanium alloys. The new tool is made of a Co-based alloy strengthened by precipitating intermetallics, Co3(Al,W), with an Ll2 structure at high temperatures. The Co-based alloy tool can be manufactured at a low cost through a simple production method consisting of casting, heat-treatment, and then machining. It exhibits yield strengths higher than 500 MPa at 1000°C, so that it might have great potential as a FSW tool for high-softening- temperature materials. In this study, the feasibility to use the Co-based alloy tool to friction stir weld various high-softening-temperature materials was examined. Changes in tool shape during FSW and the weld appearances produced with the Co-based alloy tool will be briefly shown.

Original languageEnglish
Title of host publicationFriction Stir Welding and Processing VI - Held During the TMS 2011 Annual Meeting and Exhibition
PublisherMinerals, Metals and Materials Society
Number of pages7
ISBN (Print)9781118002018
Publication statusPublished - 2011

Publication series

NameTMS Annual Meeting


  • Co-based alloy
  • Friction stir welding
  • Steels
  • Ti alloys
  • Tool

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


Dive into the research topics of 'Development of a cobalt-based alloy FSW tool for high-softening-temperature materials'. Together they form a unique fingerprint.

Cite this