Residual stress, microstructure and microhardness measurements in AA7075-T6 FSW welded sheets

Friction stir welding (FSW) is a relatively new joining technique particularly for aluminium alloy which is difficult to weld by fusion. In this work, the experimental results on FSW AA7075-T6 sheets were studied. The residual stresses were measured across the weld by ultrasonic method. This techniq...

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Bibliographic Details
Published in:Nondestructive testing and evaluation 2011-03, Vol.26 (1), p.1-11
Main Authors: Gachi, Saliha, Boubenider, Fouad, Belahcene, Farid
Format: Article
Language:English
Subjects:
Aluminum alloys
Base metal
calibration
Compressive properties
Friction stir welding
Hardness testing
Heat affected zone
Joining
Microstructure
Nondestructive testing
radiography
Residual stress
Studies
ultrasonic residual stresses
Welded joints
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Summary:Friction stir welding (FSW) is a relatively new joining technique particularly for aluminium alloy which is difficult to weld by fusion. In this work, the experimental results on FSW AA7075-T6 sheets were studied. The residual stresses were measured across the weld by ultrasonic method. This technique has various advantages: nondestructive, reproducible, fast and not expensive. Thereafter, the microstructure phenomenon and microhardeness measurements were investigated both in parent metal and in the joint. The results show a higher residual stresses in the heat-affected zone. Small compressive residual stresses were detected in the parent metal adjacent to the heat-affected zone and the nugget zone. The microstructure reveals very fine grains in the weld zone compared to parent metal.
ISSN:1058-9759
1477-2671
DOI:10.1080/10589751003658040