The University of Osaka · Engineering
Professor Ramy Gadallah's research lab specializes in the mechanical behavior and structural integrity of welded joints, with a strong focus on fracture mechanics, residual stress analysis, and fatigue life prediction in high-strength and structural steels. The lab employs advanced numerical methods such as the finite element method (FEM), interaction integral, and domain integral techniques to evaluate stress intensity factors (SIFs) and assess crack driving forces under complex loading and welding conditions. Key research directions include the influence of shielding gas composition on weld quality in flux-cored arc welding, the role of welding sequences in residual stress development, and the effects of tensile overloads on fatigue performance. The lab also contributes to experimental validation using advanced measurement techniques like the contour method for residual stress reconstruction.
Figures are computed from collected data and may differ slightly.
In this study, the influence of variation in the shielding gas composition on the weld properties of steel ST 37-3 was investigated. Six different shielding gas compositions in addition to pure argon (Ar) and pure CO2 were studied in this work using flux cored arc welding (FCAW) process. For bead-on-plate (B.O.P) specimens pure Ar shielding gas has excellent arc stability; however, with increase of the CO2 percent in the shielding gas compositions, the arc stability becomes noisy (unstable arc)
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