Fatigue strength of tungsten inert gas-repaired weld joints in airplane critical structures |
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| Authors: | Marcelino P. Nascimento Herman J.C. Voorwald |
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| Affiliation: | a State University of São Paulo, Department of Materials and Technology - UNESP/FEG/DMT, Av. Ariberto Pereira da Cunha, No. 333, CEP 12516-410, Guaratinguetá (SP), Brazil
b Federal University of Rio de Janeiro, Department of Metallurgical and Materials Engineering - PEMM/COPPE/UFRJ, Cidade Universitária, Centro de Tecnologia, Bloco F, Sala F-210, Ilha do Fundão, Caixa Postal 68505, CEP 21941-972, Rio de Janeiro (RJ), Brazil |
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| Abstract: | In this work the effect of Gas Tungsten Arc Welding (GTAW) repairs on the axial fatigue strength of an AISI 4130 steel welded joint used in airframe critical to the flight-safety was investigated. Fatigue tests were performed at room temperature on 0.89 mm thick hot-rolled plates with constant amplitude and load ratio of R = 0.1, at 20 Hz frequency. Monotonic tensile tests, optical metallography and microhardness, residual stress and weld geometric factors measurements were also performed. The fatigue strength decreased with the number of GTAW repairs, and was related to microstructural and microhardness changes, as well as residual stress field and weld profile geometry factors, which gave origin to high stress concentration at the weld toe. |
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| Keywords: | AISI 4130 aeronautical steel Repair welding Weld metal and HAZ Microstructure Weld geometry Flight-safety |
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