Cold shut

Also known as lapA surface irregularity appearing as a fissure or opening, caused by the folding over of hot metal, fins or sharp corners and by subsequent rolling or forging (but not welding) of these into the surface. or foldA forging defect caused by folding the metal back on its own surface during its flow in the die cavity. See Lap.. A defect such as lap that forms whenever metal folds over itself during forgingThe process of working metal to a desired shape by impact or pressure in hammers, forging machines (upsetters), presses, rolls, and related forming equipment.. This can occur where vertical and horizontal surfaces intersect.