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Metallography, Microstructure, and Analysis

, Volume 8, Issue 5, pp 713–725 | Cite as

Friction Stir Spot Vibration Welding: Improving the Microstructure and Mechanical Properties of Al5083 Joint

  • Behrouz BagheriEmail author
  • Ali Akbar Mahdian Rizi
  • Mahmoud Abbasi
  • Mohammad Givi
Technical Article

Abstract

In this study, a modified version of friction stir spot welding (FSSW) is applied to join Al5083 specimens. In respect to conventional FSSW, this new method leads to better characteristics, finer grain sizes in the stir zone and higher mechanical properties. In this method, the workpiece is vibrated normal to tool axis direction during FSSW. This process is entitled friction stir spot vibration welding (FSSVW). The finite element method (FEM) was used to validate the experimental results. The FEM and experimental results had a good agreement. The microstructure of the welded zone was analyzed by scanning electron microscopy and optical microscopy. The results showed that the presence of vibration during FSSW led to more grain refinement. This was related to more straining of material in the welded zone which enhanced the dynamic recovery and recrystallization and increased the grain refinement. The results showed that grain size of welded region for friction stir spot-welded specimen was about 35% lower than that for friction stir spot-welded specimen. Mechanical properties such as tensile shear load and hardness increased as the vibration was applied. Also, mechanical properties increased as vibration frequency increased from 28 to 38 Hz during FSSVW.

Keywords

Friction stir spot vibration welding Finite element method Microstructure Mechanical analysis 

Abbreviations

FSSW

Friction stir spot welding

FSSVW

Friction stir spot vibration welding

S-FSSVW

Simulation of friction stir spot welding

HAZ

Heat-affected zone

TMAZ

Thermo-mechanical-affected zone

WNZ

Weld nugget zone

UAFSW

Ultrasonic-assisted friction stir welding

SEM

Scanning electron microscopy

CEL

Coupled Eulerian–Lagrangian

JCP

Johnson–Cook plasticity

EDS

Energy-dispersive spectrometry

List of Symbols

Z

Zener–Hollomon parameter

R

Gas constant

\( \sigma \)

Static yield stress

\( \varepsilon \)

Equivalent plastic strain

Notes

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Behrouz Bagheri
    • 1
    Email author
  • Ali Akbar Mahdian Rizi
    • 2
  • Mahmoud Abbasi
    • 2
  • Mohammad Givi
    • 2
  1. 1.Department of Mining and MetallurgyAmirkabir University of TechnologyTehranIran
  2. 2.Faculty of EngineeringUniversity of KashanKashanIran

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