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Microstructures and Failure Mechanisms of Spot Friction Welds in Lap-Shear Specimens of Aluminum 6061-T6 Sheets

[+] Author Affiliations
Dung-An Wang

National Chung Hsing University

Sheng-Chiang Lee, Kang-Yuan Hsieh

Da Yeh University

Paper No. IMECE2005-82397, pp. 1057-1061; 5 pages
doi:10.1115/IMECE2005-82397
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Manufacturing Engineering and Materials Handling, Parts A and B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Manufacturing Engineering Division and Materials Handling Division
  • ISBN: 0-7918-4223-1 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

Microstructures and failure mechanisms of spot friction welds in aluminum 6061-T6 lap-shear specimens are investigated based on experimental observations. Different processing parameters were used to join the aluminum sheets. Optical micrographs of the cross sections of spot friction welds in lap-shear specimens before and after failure are examined. These spot friction welds show the failure mode of nugget pullout under lap-shear loading conditions. The experimental observations suggest that under lap-shear loading conditions, the failure is initiated near the stir zone in the middle part of the nugget and the failure propagates along the circumference of the nugget to final fracture.

Copyright © 2005 by ASME

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