Fatigue testing of 2198 T8 FSW aluminum alloy with and without LoP defect

Fatigue testing of 2198 T8 FSW aluminum alloy with and without LoP defect PurposeThe Lack of Penetration (LoP) defect is one of the flaws that can be generated during the friction stir welding (FSW) process. Depending on the size, the depth and the severity of the LoP defect, it is possible that it is hardly detectable by optical inspection or other NDT methods. Whether detectable or not, this defect may lead to a significant degradation of the fatigue properties of the welded material, as the improperly welded zone can act as a fracture initiation site. The paper aims to discuss these issues.Design/methodology/approachIn this experimental investigation, an attempt is made to assess and compare the fatigue behavior of FSW aluminum joints with and without the LoP defect.FindingsIt was found that the LoP defect affects the fatigue behavior of the welded material at high stress levels whereas the effect diminishes with decreasing stress levels.Originality/valueDepending on the design stress levels, the LoP defect may dominate fracture and thus, the welding parameters should be carefully selected so as to avoid such defect. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Structural Integrity Emerald Publishing

Fatigue testing of 2198 T8 FSW aluminum alloy with and without LoP defect

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
1757-9864
DOI
10.1108/IJSI-04-2016-0015
Publisher site
See Article on Publisher Site

Abstract

PurposeThe Lack of Penetration (LoP) defect is one of the flaws that can be generated during the friction stir welding (FSW) process. Depending on the size, the depth and the severity of the LoP defect, it is possible that it is hardly detectable by optical inspection or other NDT methods. Whether detectable or not, this defect may lead to a significant degradation of the fatigue properties of the welded material, as the improperly welded zone can act as a fracture initiation site. The paper aims to discuss these issues.Design/methodology/approachIn this experimental investigation, an attempt is made to assess and compare the fatigue behavior of FSW aluminum joints with and without the LoP defect.FindingsIt was found that the LoP defect affects the fatigue behavior of the welded material at high stress levels whereas the effect diminishes with decreasing stress levels.Originality/valueDepending on the design stress levels, the LoP defect may dominate fracture and thus, the welding parameters should be carefully selected so as to avoid such defect.

Journal

International Journal of Structural IntegrityEmerald Publishing

Published: Aug 14, 2017

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