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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of several TIG weld repairs on the axial fatigue strength of AISI 4130 aeronautical steel-welded joints

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Author(s):
Nascimento, M. P. [1] ; Voorwald, H. J. C. [1] ; Payao Filho, J. Da C. [2]
Total Authors: 3
Affiliation:
[1] Univ Estadual Paulista UNESP FEG, Dept Mat & Technol DMT, BR-12516410 Sao Paulo - Brazil
[2] Univ Fed Rio de Janeiro, Dept Met & Mat Engn PEMM COPPE UFRJ, Ctr Tecnol, Ilha Fundao, BR-21941972 Rio De Janeiro, RJ - Brazil
Total Affiliations: 2
Document type: Journal article
Source: FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES; v. 35, n. 3, p. 191-204, MAR 2012.
Web of Science Citations: 5
Abstract

Welded joints of airframes critical to the flight-safety are commonly repair welded during its operational live. In this study, the effect of up to three weld repairs by gas tungsten arc welding (GTAW) on the axial fatigue strength of AISI4130 steel used in an airframe critical to the flight-safety was investigated. The tests were performed on hot-rolled steel plate specimens, 0.89 mm thick, with load ratio R= 0.1, constant amplitude, at 20 Hz frequency and room temperature. The results obtained indicated that the axial fatigue strength decreased with the GTAW process itself, and with the subsequent repair cycles, as a consequence of microstructural and microhardness changes and of weld profile geometry factors, which induced high stress concentration at the weld toe. (AU)