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The relative effects of residual stresses and weld toe geometry on fatigue life of weldments
Affiliation:1. Department of Engineering Science, University West, SE-461 86 Trollhättan, Sweden;2. ESAB AB, Lindholmsallen 9, 40227 Gothenburg, Sweden;1. Aalto University School of Engineering, Department of Mechanical Engineering, P.O. Box 14300, FIN-00076 Aalto, Finland;2. Meyer Turku Shipyard, Telakkakatu 1, FI-20101 Turku, Finland;1. Department of Civil Engineering, KU Leuven, Belgium, Jan Pieter de Nayerlaan 5, Sint-Katelijne-Waver, Belgium;2. University of Oxford, Department of Engineering Science, Oxford, UK;1. Technical Institute, Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-cho, Akashi City, Japan;2. Osaka University, 2-1, Yamadaoka, Suita City, Osaka, Japan;1. The Graduate School of Construction Engineering, Chung-Ang University, 84, Huksuk-ro, Dongjak-ku, Seoul 06974, Republic of Korea;2. Department of Civil and Environmental & Plant Engineering, Chung-Ang University, 84, Huksuk-ro, Dongjak-ku, Seoul 06974, Republic of Korea;3. Division of Computational Mechanics, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;4. Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;1. Department of Engineering and Management, University of Padova, Stradella San Nicola 3, 36100 Vicenza, Italy;2. School of Marine Science and Engineering, University of Plymouth, Drake Circus, Plymouth, England, United Kingdom;3. Department of Mechanical Engineering, Nelson Mandela Metropolitan University, Port Elizabeth, South Africa
Abstract:The weld toe is one of the most probable fatigue crack initiation sites in welded components. In this paper, the relative influences of residual stresses and weld toe geometry on the fatigue life of cruciform welds was studied. Fatigue strength of cruciform welds produced using Low Transformation Temperature (LTT) filler material has been compared to that of welds produced with a conventional filler material. LTT welds had higher fatigue strength than conventional welds. A moderate decrease in residual stress of about 15% at the 300 MPa stress level had the same effect on fatigue strength as increasing the weld toe radius by approximately 85% from 1.4 mm to 2.6 mm. It was concluded that residual stress had a relatively larger influence than the weld toe geometry on fatigue strength.
Keywords:Weld toe geometry  Residual stress  Fatigue strength  Low Transformation Temperature filler material
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