Cold Shut

1) A discontinuity that appears on the surface of cast metal as a result of two streams of liquid slashing and swirling against the mold, particularly at the start of the pouring of each bar, and failing to unite. 2) A surface defect on a forging or billet that closed without complete bonding during deformation. 3) An irregularity that forms on the top of an ingot before solidification is complete within the mold.