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Friction stir welding (FSW) is a relatively new technique for welding that uses a cylindrical pin or nib inserted along the weld seam. The nib (usually threaded) and the shoulder in which it is mounted are rapidly rotated and advanced along the seam. Extreme deformation takes place, leaving a fine equiaxed structure in the weld region. The flow of metal during FSW is investigated using a faying surface...
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