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Keywords
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Friction stir welding, Underwater, Microstructure, Hardness, Tensile properties
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Abstract
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Defect free friction stir welding of pure copper plates was conducted in air condition at a rotation
speed of 1600 rev min21 and traverse speeds of 50 and 100 mm min21. The microstructural and
mechanical properties of defect free joints produced in air and underwater conditions were
compared. The results revealed that a finer microstructure can be achieved by underwater friction
stir welding. The hardness of joints welded in both conditions was higher compared to the base
metal. Moreover, in comparison with the base metal, the joints welded in air and underwater
conditions exhibited lower and higher tensile properties respectively.
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