Omid Abouali - Assistant Professor, Department of Mechanical Engineering, Shiraz University Shiraz, Iran
Daryush K Aidun - Full Professor, MAE Dept., Clarkson University, NY, USA
Goodarz Ahmadi - Full Professor, MAE Dept., Clarkson University, NY, USA

In this research, GTA welds onto the aluminum alloy 6061 and nickel are investigated at varying levels of gravity (g) using computer simulation techniques. The numerical results are compared with the existing experimental data. Computer simulation in agreement with the experimental data shows that the depth of the melting pool decreases as gravity increases and this trend is more markedly observed for the aluminum weld than for nickel. The velocity in the melting pool increases at higher level of gravity and enhances convection. Numerical simulations also show deeper weld pool penetration compared with the existing results. This observation is justified due to the effect of Coriolis and centrifugal forces on the arc plasma flow and different cooling conditions on the bottom surface of the work piece.

GTA Welding - Gravity – Numerical Simulation