A NUMERICAL MODEL FOR ELECTROMAGNETIC FORCE OF ARC WELDING IN HIGH GRAVITY CONDITION
Publish place: 14th Annual Conference of Mechanical Engineering
Publish Year: 1385
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ISME14_537
تاریخ نمایه سازی: 1 فروردین 1386
Abstract:
Gas Tungsten Arc welds onto the aluminum and nickel are investigated at varying levels of gravity (g) using A CFD scheme. Axisymmetric forms of continuity, Navier-stokes and energy equations are solved to find the flowfield, temperature distribution and welding pool shape in the work-piece. Having some analytical integral solutions related to Maxwell’s equations in an axis-symmetric system with Magneto-hydrodynamics (MHD) approximation, an accurate description of the electromagnetic force in the welding pool is considered. Comparison of the numerical results with the existing experimental data shows that in agreement with the experimental data the depth of the melting pool decreases as gravity increases but this trend is more markedly observed experimental data. In other word numerical simulations show deeper weld pool penetration compared with the existing results. A dimensional analysis justifies this due to the effect of Coriolis and centrifugal forces on the arc plasma flow which changes the arc pressure and shear stress over the work piece. The velocity in the melting pool increases at higher level of gravity and enhances convection.
Keywords:
GTA Welding - Gravity – Numerical Simulation-Electromagnetic
Authors
Omid Abouali
Assistant Professor, Mech. Eng. Dept., Shiraz University
Parisa Vaziei
Student, Mech. Eng. Dept., Shiraz University
Daryush Aidun
Professor & Chairman, MAE Dept., Clarkson University, NY, USA
Goodarz Ahmadi
Professor & Dean of Engineering, Clarkson University, NY, USA
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