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Pinless friction stir spot welding of aluminium alloy with copper interlayer

Authors
  • Abed, Balsam H.1
  • Salih, Omar S.2
  • Sowoud, Khalid M.1
  • 1 Department of Mechanical Power Engineering, Engineering Technical College-Baghdad, Middle Technical University, Iraq , (Iraq)
  • 2 Department of Mechanical Engineering, Engineering Technical College-Baghdad, Middle Technical University, Iraq , (Iraq)
Type
Published Article
Journal
Open Engineering
Publisher
De Gruyter Open
Publication Date
Sep 11, 2020
Volume
10
Issue
1
Pages
804–813
Identifiers
DOI: 10.1515/eng-2020-0090
Source
De Gruyter
Keywords
License
Green

Abstract

Spot welding joints of Al-Mg-Si alloy (AA6061-T6) were produced with and without the addition of copper interlayer using pinless friction stir spot welding (P-FSSW). To investigate the effects of welding parameters on the metallurgical and mechanical properties of the weldment, various tool plunge depth and dwell time were used. Optical microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy (EDS) have been used for microstructural characterisation.Meanwhile, the mechanical characterisation of the welded joints was evaluated by tensile-shear test. The experimental results showed that a larger bonding area and sound joint were achieved with the addition of Cu interlayer due to the improvement in thermal distribution. Also, an alloying reaction took place between the aluminium substrate and Cu interlayer during P-FSSW, forming intermetallic compounds layer in the interface through the diffusion process. The increasing of dwell time and plunge depth to some extent were beneficial to the formation of the joint and diffusion process, and thus increasing the tensile-shear load of the joints. The observed fracture mode of the joint was either completely shear off in the interface or complete nugget pullout.

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