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 AISI 4130 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.
Effects of several TIG weld repairs on the axial fatigue strength of AISI 4130 aeronautical steel-welded joints
Effekte verschiedener TIG-Schweißreparaturen auf die axiale Ermüdungsfestigkeit von Schweißverbindungen aus AISI 4130 Stahl im Flugzeugbau
Fatigue and Fracture of Engineering Materials and Structures ; 35 , 3 ; 191-204
2012
14 Seiten, 15 Bilder, 4 Tabellen, 34 Quellen
Article (Journal)
English
Flugzeugbau , Flugzeugzelle , Wolfram-Schutzgasschweißen , Schweißverbindung , Ermüdungsfestigkeit , Reparaturschweißen , Dauerschwingfestigkeit , zyklische Beanspruchung , Flugsicherheit , Gefügeänderung , Mikrohärte , Nahtform , Spannungskonzentration , Ermüdungsrissausbreitung , zerstörungsfreie Prüfung
Effects of surface treatments on the fatigue strength of AISI 4340 aeronautical steel
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