Conventional and cooling assisted friction stir welding of AA6061 and AZ31B alloys

Kush P. Mehta, Pierpaolo Carlone, Antonello Astarita*, Fabio Scherillo, Felice Rubino, Poojan Vora

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

Conventional and cooling assisted friction stir welded Al–Mg joints were investigated by visual inspection, optical macro plus microscopy, scanning electron micrographs, energy dispersive X-ray spectroscopy, X-ray diffractions, tensile testing and micro hardness indentation. The nugget zone is characterized by onion rings composed of different phases such as Mg in an Al matrix, Al in an Mg matrix as well as intermetallic compounds, Al3Mg2 and Al12Mg17. A diffusion layer was detected on the Al side of the joint between the nugget and thermo-mechanically affected zones identifying a solid solution of Mg in Al. No diffusion layer was observed on the Mg side. The tensile strength of the dissimilar joints is enhanced by cooling assisted welding process due to the reduction in the amount of intermetallic compounds inside the weld bead. Congruently, higher hardness peaks are reported in the nugget zone of conventional FSW joint with respect to the CFSW joint.

Original languageEnglish
Pages (from-to)252-261
Number of pages10
JournalMaterials Science and Engineering A
Volume759
DOIs
Publication statusPublished - 24 Jun 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • Cooling assisted friction stir welding
  • Dissimilar joint
  • Intermetallic compounds
  • Mechanical properties
  • Microstructure

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