Microstructure and mechanical properties of friction stir welded copper

The main objective of this investigation was to apply friction stir welding technique (FSW) for joining of 2 mm thick copper sheet. The defect free weld was obtained at a tool rotational and travel speed of 1,000 rpm and 30 mm/min, respectively. Mechanical and microstructural analysis has been perfo...

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Bibliographic Details
Published in:Journal of materials science 2007-10, Vol.42 (19), p.8126-8129
Main Authors: SAKTHIVEL, T, MUKHOPADHYAY, J
Format: Article
Language:English
Subjects:
Applied sciences
Base metal
Copper
Cross-disciplinary physics: materials science
rheology
Elongation
Exact sciences and technology
Friction stir welding
FRICTION WELDING
GRAIN SIZE AND SHAPE
Grains
HARDNESS
HEAT AFFECTED ZONE
Joining, thermal cutting: metallurgical aspects
JOINTS
Materials science
MECHANICAL PROPERTIES
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructural analysis
Microstructure
MICROSTRUCTURES
Other topics in materials science
Physics
Welded joints
WELDING
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Summary:The main objective of this investigation was to apply friction stir welding technique (FSW) for joining of 2 mm thick copper sheet. The defect free weld was obtained at a tool rotational and travel speed of 1,000 rpm and 30 mm/min, respectively. Mechanical and microstructural analysis has been performed to evaluate the characteristics of friction stir welded copper. The microstructure of the weld nugget (WN) consists of fine equiaxed grains. Similarly, the elongated grains in the thermomechanically affected zone (TMAZ) and coarse grains in the heat-affected zone (HAZ) were observed. The hardness values in the WN were higher than the base material. Eventually HAZ shows lowest hardness values because of few coarse grains presence. Friction stir welded copper joints passes 85% weld efficiency as compared to the parent metal.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-007-1666-y