MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Weibull Statistics for Evaluating Failure Behaviors and Joining Reliability of Friction Stir Spot Welded 5052 Aluminum Alloy
Chung-Wei YangFei-Yi HungTruan-Sheng LuiLi-Hui ChenJiun-Yu Juo
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2009 Volume 50 Issue 1 Pages 145-151

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Abstract

Friction stir spot welding (FSSW) was applied to make lap-joints of 5052 rolled (5052-R) aluminum alloys. The resulting microstructural observation, microhardness, tensile shear failure load and failure morphologies are reported, including a brief look into failure behaviors in the present study. The metallurgical bonded TMAZ region with a plastic metal flow is obviously created around the probe, and the microhardness is significantly increased at the TMAZ region for FSSW-joined 5052 aluminum alloys. The FSSW lap-joints with an obvious metallurgical bonded TMAZ region generally display a higher failure load and ductile failure morphologies with dimples fracture. In addition, the failure load of FSSW lap-joints was increased with increasing the probe penetration depth and the welding time. Based on the data fluctuation of tensile shear failure load, the Weibull model provided a statistical analysis method for assessing the minimum failure, the failure mechanism and the joining reliability for the FSSW lap-joints. Through the statistical analysis of the Weibull distribution function, FSSW-joined aluminum alloys with a wear-out failure model are recognized as reliable lap-joints for further engineering application.

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© 2009 The Japan Institute of Metals and Materials
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