Journal
MATERIALS & DESIGN
Volume 106, Issue -, Pages 235-246Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.05.117
Keywords
Resistance spot welding; Thermo-compensated method; Aluminum alloys; Copper; Dissimilar metal joining; Tensile shear properties
Categories
Funding
- National Nature Science Foundation of China [51275342, 51405334]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130032110004]
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A parametric study was used to investigate the feasibility of dissimilar Al/Cu joining by a thermo-compensated resistance spot welding process. The tensile shear properties of the joints were found to be affected by both the weld's physical properties and metallurgical factors: (1) With increasing heat input, the nugget size and indentation increased, which led to the failure mode of the joint to change from interfacial failure to pull-out mode. (2) There was a critical heat input at which the microstructure changed in the fusion zone. At normal heat input, the fusion zone consisted of a significant amount of alpha-Al solid solution and a thin transition layer (alpha-Al/theta-CuAl2 eutectic to theta-CuAl2) at the Al/Cu interface, producing a high nugget's shear strength. At high heat input, the fusion zone mainly consisted of Al-Cu intermetallic compounds (IMCs), producing a low nugget's shear strength. The fractograph revealed cleavage features in the interfacial failure mode and dimples in the pull-out mode, which implied that the crack propagated respectively in the IMC zone and the periphery of the nugget. The Al/Cu thereto-compensated resistance spot weld joints presented a tensile shear peak load comparable to that of Al/Al joints, though their ductility was deteriorated by the IMCs. (C) 2016 Elsevier Ltd. All rights reserved.
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