Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 211, Issue 6, Pages 972-977Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2010.12.014
Keywords
Friction stir spot welding; Tool design; Al alloy 6016; Process parameter; Separation mode
Funding
- National Science Foundation [NSF-EEC-0531019]
- General Motors Company
- Friction Stir Link for the Missouri University of Science and Technology site
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1157754] Funding Source: National Science Foundation
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Friction stir spot welding (FSSW) of Al alloy 6016-T4 sheet was evaluated using a conventional pin (CP) tool and off-center feature (OC) tool. Tool rotation speed and plunge depth were varied to determine the effect of individual process parameter on lap-shear separation load. Maximum separation load of about 3.3 kN was obtained by using a 0.2 mm shoulder penetration depth with 1500 rpm tool rotation speed for the CP tool and 2500 rpm for the OC tool. Three different weld separation modes under lap-shear loading were observed: interfacial separation, nugget fracture separation and upper sheet fracture separation. Microhardness profile for weld cross section indicated no direct relationship between microhardness distribution and separation locations. (C) 2010 Elsevier B.V. All rights reserved.
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