aser engraving on metal is the only marking process that hits Solve-tier depth for industrial UID, gunsmithing, jewelry, and signage in one workflow — yet most online guides skip the parameters that determine whether a job runs in 30 seconds or 30 minutes. This guide pulls absorption physics, ANSI safety classes, and per-metal power/speed/frequency settings from primary literature into one operator-grade reference, working with metals like stainless steel, aluminum, and brass.