Patent ID: 7237597

Claim:
A method for control of stirring motion in a casting mold for continuous or semi-continuous casting of metals, which mold is open in both ends in a casting direction, melt being supplied to the mold, a stirring motion being induced to the melt in the mold by means of a first electromagnetic induction coil energized by A.C. current, the stirring motion of the melt in a region adjacent to an upper free surface of the melt being controlled by means of a second electromagnetic induction coil arranged upstream of the first induction coil, wherein the second induction coil is selectively energized by either D.C. or A.C. current in accordance with requirements of casting operations; and including providing a mode of operation in which the second induction coil is energized by D.C. current so as to produce a horizontally-directed D.C. magnetic field which induces electromagnetic forces in the melt opposing fluid flow direction, in transversal as well as longitudinal spatial planes of the mold, in the region of the melt adjacent to the upper free surface thereof the magnetic field produced by the second induction coil thereby reducing a velocity of the stirring motion induced in the region of the melt adjacent to the upper free surface thereof by the first induction coil, a velocity of longitudinal flows produced in the melt by the stirring action of the first induction coil, as well as longitudinal flows produced by continuously discharging melt into the mold.