Effects of pulsating water method and conventional casting on the butt curl phenomena of the aluminum ingots with the size of 400 mm in width and 1320 mm in length were investigated comparatively. The butt curl deformation reaches up to 52 mm and 5

1

2 mm in the aluminum alloy ingot produced by conventional casting and by pulsating water

respectively

in condition of casting temperature of 720℃

casting velocity of 35

6

5 mm/min and cooling water of 20

5

0 m3/h. The decrease of butt curl is attributed to the fact that pulsating water decreases the cooling rate of the ingot resulting in the decrease of the temperature difference between the ingot center and surface

which reduces the torque moment induced by tensile stress and improves the rigidity of the bottom shell.