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This study aims to explore the effect of active cooling with compressed air on microstructure and the mechanical properties of pure copper joint fabricated via friction stir welding (FSW) process. Three-mm-thick copper plates were FSWed at tool rotation speed of 2000 rpm and weld speed of 30 mm/min. Compressed air of 10 psi (68.9 kPa) pressure and 20 psi (137.8 kPa) pressure were aimed at the weld line. Compared to Normal FSW the tensile strength and ductility of joints was increased by 19 MPa (10.79%) and 4 % (30.76%) respectively using 10 psi compressed air pressure. On further cooling using 20 psi compressed air, these values decreased by 32 MPa (18.18%) and 4.65% (35.76%). Active cooling resulted in fine grain structure in the joint nugget zone.

Assisted cooling approach for FSW of pure copper