Cold lap

A flaw that results when a workpiece fails to fill the dieThe machined recess in a die that gives the forging its shape. cavityThe machined recess in a die that gives the forging its shape. during the first forgingThe process of working metal to a desired shape by impact or pressure in hammers, forging machines (upsetters), presses, rolls, and related forming equipment.. A seam is formed as subsequent diesThe metal blocks into which forging impressions are machined and from which forgings are produced. force metal over this gap to leave a seam on the workpiece surface. See also Cold ShutAlso known as lap or fold. A defect such as lap that forms whenever metal folds over itself during forging. This can occur where vertical and horizontal surfaces intersect..