Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10417551 | Journal of Materials Processing Technology | 2011 | 10 Pages |
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 0.89Â mm thick hot-rolled plates with constant amplitude and load ratio of RÂ =Â 0.1, at 20Â 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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Authors
Marcelino P. Nascimento, Herman J.C. Voorwald, João da C. Payão Filho,