Influences of Sign of Surface Tension Coefficient on Turbulent Weld Pool Convection in a Gas Tungsten Arc Welding (GTAW) Process: A Comparative Study

摘要: The effects of positive and negative surface tension coefficients (∂σ sur /∂T) on both laminar turbulent weld pool convection are numerically studied for a typical gas tungsten arc welding (GTAW) process. Three-dimensional in is simulated using suitably modified high Reynolds number k-e model order to account the morphology an evolving solid-liquid interface. Key sign coefficient transport GTAW process highlighted by comparing simulation results with corresponding ones from model, keeping all other parameters unaltered. A scaling analysis also performed obtain order-of-magnitude estimates penetration coefficients. predictions good agreement numerical results, sense.