Which description fits a 'lap' defect in metal processing?

A 'lap' defect in metal processing refers to a surface imperfection that resembles a fold. This defect occurs when the material is not properly rolled or forged, resulting in overlapping or folding of the metal surface. This can compromise the integrity of the material and may lead to further issues during its use, including potential points of weakness that can result in failure under stress.

Understanding 'lap' defects is crucial for quality control in metal manufacturing processes, as they can affect the performance and reliability of the final product. The characteristic appearance of a 'lap' is what distinguishes it from other defects, allowing for targeted inspection measures to reduce the incidence of such flaws in metal fabrication.