Experimental verification of electro-magnetically driven flow in the weld pool

The authors have developed a mathematical model of heat and mass transfer in the stationary TIG arc weld pool considering four possible forces which induce streaming. They are two kinds of body forces, i.e., Electro-magnetic and buoyancy forces, and two shear stresses, i.e., surface tension and aerodynamic drag force. However, every mathematical modeling is always made under the appropri ate assumption and boundary conditions as well as some simplification. Also, one encounters problems on the lack of physical properties of material, especially at elevated temperature. Therefore, it is essentially necessary to verify the model by experiments.The present authors have conducted various model experiments for the effects of electro-magnetic force and aerodynamic drag force to verify the validity of developed model. In this paper, it was revealed the experimental results of the individual effect of electromagnetic force on the convection using a mercury pool contained in a basin with current flow and velocity distribution of liquid was measured.Also, another model experiment was performed using a wood's metal surface and electric current was flown from the soldering iron to wood's metal and the resultant penetration shape was obserbed. In both model experiments, the coincidence of calculated and experimental model was experimentally verified.