 Continuous casting methods for ingot processing also exist, whereby a stationary front of solidification is formed by the continual take-off of cooled solid material, and the addition of molten liquid to the casting process.Approximately 70 percent of aluminium ingots in the U.S. are cast using the direct chill casting process, which reduces cracking.A total of 5 percent of ingots must be scrapped because of stress induced cracks and butt deformation.