Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 19, Issue 7, Pages 617-622Publisher
MANEY PUBLISHING
DOI: 10.1179/1362171814Y.0000000235
Keywords
Aluminium alloy; Friction spot welding; Microstructure; Mechanical property
Funding
- National Natural Science Foundation of China [51175117]
- National Basic Research Program of China [2010CB731704]
- National Science and Technology Major Project of China [2010ZX04007-011]
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Two millimetre thick Alclad 7B04-T74 aluminium alloy was friction spot welded at different tool rotation speeds. The weld formation, Alclad redistribution, microstructures and mechanical properties of the joints were investigated. The results indicate that inappropriate tool rotation speeds can give rise to weld defects, such as annular groove, void and surface concavity. After welding, the original surface Alclad is redistributed as a U shaped Alclad layer in the weld. When the tool rotation speed is relatively high, eutectic films can be observed in the stir zone, and the Alclad layer in the weld is a preferred crack propagation path during tensile shear testing. The optimised joint with a tensile shear failure load of 11 921 N can be obtained at a tool rotation speed of 1500 rev min(-1).
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