Friction spot joining of high strength steel sheets for automotives

Ryoji Ohashi, Mitsuo Fujimoto, Sergey Mironov, Yutaka S. Sato, Hiroyuki Kokawa

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In this study, friction spot joining (FSJ) was applied to dual-phase steel DP980 using a newly-developed silicon nitride (Si3N4) tool with a threaded pin, after which microstructure and strength of the joint were examined. The cross-sectional microstructure was distinctly classified into four zones which experienced the different heat cycles and deformation histories during FSJ. Electron probe micro analyzer revealed that silicon, oxygen and nitrogen were involved in the alternate band patterns observed in the stir zone, which could be attributed to contamination from the tool. The contamination was prevented by coating of the tool surface and the use of Ar shielding. The mechanical tests showed that the contamination reduced the joint strength, especially the cross tensile strength.

Original languageEnglish
Pages (from-to)23-27
Number of pages5
JournalWelding in the World
Volume53
Issue number5-6
DOIs
Publication statusPublished - 2009 Jan 1

Keywords

  • Automobile engineering
  • Friction welding
  • Hardness
  • Lap joints
  • Mechanical properties
  • Microstructure
  • Strength

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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