大阪大学 · 工学
Ramy Gadallah教授の研究室は、溶接構造物の信頼性と耐久性を高めるため、溶接ひずみ・応力の評価とその制御を主な研究テーマとしています。特に、溶接ガスの組成が溶接部の溶接性や疲労寿命に与える影響、溶接残留応力の測定とシミュレーション、ひびわれのひび割れ力学的挙動の解析に注力しています。高強度鋼の溶接部におけるひびわれの駆動力や、過渡的荷重が疲労寿命に与える影響についても、非線形有限要素解析と破壊力学的手法を応用して精密に評価しています。
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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