Magnetic field distribution of the traveling magnetic field generator used for electromagnetic casting and its action on the melt

Magnetic flux density distribution of traveling magnetic field generator used for electromagnetic casting and its action on the melt were investigated. The results show that magnetic flux density in z and y direction (B_z and B_y) varies inversely. Existence of B_z results in pit defects in surface during mold filling. Although B_z can obviously accelerate the melt flow velocity to improve the ability to filling mold, section of the melt front is decreased to take converse filling mold, resulting in cold shut defects. The surface quality can be improved by ferromagnetic up-mold via enhancing B_z and weakening B_y. The pulling force exerted on metal from magnetic field is related to the projective area of metal on the inductor. The metal cannot be moved even in the existence of electromagnetic force with the projective area less than a critical projective area.