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Effects of several TIG weld repairs on the axial fatigue strength of AISI 4130 aeronautical steel‐welded joints
Author(s) -
NASCIMENTO M. P.,
VOORWALD H. J. C.,
FILHO J. DA C. PAYÃO
Publication year - 2012
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2011.01606.x
Subject(s) - welding , gas tungsten arc welding , airframe , materials science , fatigue limit , metallurgy , arc welding , composite material , structural engineering , engineering
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.