Microstructures of friction welded joint of 6061 aluminum alloy to 304 stainless steel.

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  • FUKUMOTO Shinji
    Department of Materials Science and Engineering, Faculty of Engineering, Himeji Institute of Technology
  • OHASHI Mikio
    Himeji Institute of Technology, graduate school
  • TSUBAKINO Harushige
    Department of Materials Science and Engineering, Faculty of Engineering, Himeji Institute of Technology
  • OKITA Kozo
    Hyogo Prefectural Institute of Industrial Research
  • ARITOSHI Masatoshi
    Hyogo Prefectural Institute of Industrial Research
  • TOMITA Tomoki
    Hyogo Prefectural Institute of Industrial Research
  • GOTO Koji
    Hyogo Prefectural Institute of Industrial Research

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Other Title
  • ６０６１アルミニウム合金とＳＵＳ３０４ステンレス鋼の摩擦圧接部組織
  • 6061 アルミニウム ゴウキン ト SUS304 ステンレス コウ ノ マサ

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Abstract

A 6061 aluminum alloy was joined to a 304 stainless steel by friction welding. The structure of aluminum alloy was refined in the vicinity of the weld interface. However, the Vickers hardness was decreased near the interface since the precipitates were dissolved in the aluminum alloy matrix by the friction heat. The width of heat affected zone (HAZ) was decreased as the increase in the friction and upset pressure (P1 and P2) increased. The sound joints were obtained welded by P1 =30 MPa, P2 =60 MPa and t1 (friction time) ≥2.0 s. The higher P1 made the joint strength decrease owing to the excess formation of brittle intermetallic compounds at the weld interface. The inter-diffusion of each element through the weld interface were revealed using TEM–EDS analysis. Fe2Al5 was mainly formed at the weld interface. The welding temperature was estimated to be under the eutectic temperature of Al/Fe system(925 K) by the thickness of intermetallic compound. Therefore, it is assumed that this friction welding was carried out in solid state in this system.

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