Microstructure and mechanical properties of friction stir welded thick pure copper plates

In this study, 10-mm-thick pure copper plates were friction stir welded at a constant rotational speed of 700 rpm and different traverse speeds of 50, 100, 150, and 200 mm/min using a square pin profile tool. The thermal cycles and peak temperatures were recorded using accurate thermocouples. In add...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2016-09, Vol.86 (5-8), p.1985-1995
Main Authors: Azizi, A., Barenji, R. Vatankhah, Barenji, A. Vatankhah, Hashemipour, M.
Format: Article
Language:English
Subjects:
CAE) and Design
Computer-Aided Engineering (CAD
Copper
Ductile fracture
Elongation
Engineering
Friction stir welding
Hardness
Heat treating
Industrial and Production Engineering
Mechanical Engineering
Mechanical properties
Media Management
Metal plates
Microstructure
Optical microscopy
Original Article
Tensile tests
Thermocouples
Ultimate tensile strength
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Summary:In this study, 10-mm-thick pure copper plates were friction stir welded at a constant rotational speed of 700 rpm and different traverse speeds of 50, 100, 150, and 200 mm/min using a square pin profile tool. The thermal cycles and peak temperatures were recorded using accurate thermocouples. In addition, the microstructural features of the joints were examined by optical microscopy. Furthermore, for analyzing the mechanical performance of the joints, hardness and tensile tests were conducted. In addition, the fractography of the joints was done using a scanning electron microscope. The results showed that higher traverse speeds caused lower heat input and peak temperature and hence finer grains. Furthermore, higher traverse speeds lead to formation of the defects in the joints. With increasing the traverse speed, the ultimate tensile strength of the joints increased to a maximum value and then decreased. Likewise, with increasing the traverse speed, the hardness and elongation of the joints increased and decreased, respectively. Additionally, the joints welded at lower traverse speeds revealed more ductile fracture mode.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-015-8330-5