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Journal of Mechanical Science and Technology

, Volume 31, Issue 3, pp 1135–1142 | Cite as

Microstructures and mechanical properties of friction stir welded dissimilar steel-copper joints

  • M. Jafari
  • M. Abbasi
  • D. Poursina
  • A. Gheysarian
  • B. BagheriEmail author
Article

Abstract

Welding dissimilar metals by fusion welding is challenging. It results in welding defects. Friction stir welding (FSW) as a solid-state joining method can overcome these problems. In this study, 304L stainless steel was joined to copper by FSW. The optimal values of the welding parameters traverse speed, rotational speed, and tilt angle were obtained through Response surface methodology (RSM). Under optimal welding conditions, the effects of welding pass number on the microstructures and mechanical properties of the welded joints were investigated. Results indicated that appropriate values of FSW parameters could be obtained by RSM and grain size refinement during FSW mainly affected the hardness in the weld regions. Furthermore, the heat from the FSW tool increased the grain size in the Heat-affected zones (HAZs), especially on the copper side. Therefore, the strength and ductility decreased as the welding pass number increased because of grain size enhancement in the HAZs as the welding pass number increased.

Keywords

Dissimilar metals Friction stir welding Mechanical properties Response surface methodology 

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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • M. Jafari
    • 1
  • M. Abbasi
    • 1
  • D. Poursina
    • 2
  • A. Gheysarian
    • 1
  • B. Bagheri
    • 3
    Email author
  1. 1.Faculty of EngineeringUniversity of KashanKashanIran
  2. 2.Department of Statistics and ApplicationsFaculty of Mathematical Science, University of KashanKashanIran
  3. 3.Department of Mining and MetallurgyAmirkabir University of TechnologyTehranIran

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