Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 213, Issue 4, Pages 515-521Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2012.11.002
Keywords
Friction spot welding; AZ31 magnesium alloy; Weld strength; Failure behavior; Crack propagation
Funding
- FAPESP (Sao Paulo Research Foundation)
- CNPq (National Council for Scientific and Technological Development), Brazil
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Microstructural features were studied along the cross-section of AZ31 magnesium alloy friction spot welded joints made using different combinations of welding parameters. Static lap shear testing was performed to evaluate the mechanical properties of the welded joints, and the resulting fracture mechanisms and crack propagation paths were fully examined. Failure load is optimized when the welding procedure is performed with the combination of parameters that maximizes the material mixing, the size of fully metallurgical bonding and simultaneously minimizes the vertical displacement of hook region. The welds demonstrate three failure modes during lap shear testing: through the weld and non-circumferential pull-out modes, in which crack propagation crosses the recrystallized zone, and circumferential pull-out mode, around this zone. (C) 2012 Elsevier B.V. All rights reserved.
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