Banding in copper friction stir weld

Formation and microstructure of banding in a copper friction stir weld was studied using scanning electron microscopy, electron backscatter diffraction, and nanoindentation. Unlike in aluminium, banding only appears in 'cold' friction stir welding (FSW) welds of copper. Banding is formed b...

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Bibliographic Details
Published in:Science and technology of welding and joining 2012-02, Vol.17 (2), p.111-115
Main Authors: Savolainen, K, Saukkonen, T, Hänninen, H
Format: Article
Language:English
Subjects:
Aluminium
Aluminum
Banding
Copper
Friction stir welding
FRICTION WELDING
HARDNESS
JOINTS
Surface layer
Texture
TEXTURES
Welded joints
WELDING
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Summary:Formation and microstructure of banding in a copper friction stir weld was studied using scanning electron microscopy, electron backscatter diffraction, and nanoindentation. Unlike in aluminium, banding only appears in 'cold' friction stir welding (FSW) welds of copper. Banding is formed by layers of small and large grains. It was noticed that higher local misorientations and small grain size correlate in the welds. Owing to differences in the restoration processes of copper and aluminium, texture changes are not visible in copper even though they are in aluminium. Texture of copper FSW welds is weak and independent of the grain structure of the base material, because in the steady state dynamic recrystallisation, the restoration process of copper, the grain structure is mainly dependent of the processing parameters. The hardness differences between the small and large grains are small.
ISSN:1362-1718
1743-2936
DOI:10.1179/1362171811Y.0000000089