Stainless steel products, metal product packaging, metal profiles, and some metal parts will need to use laser coding machine to print the production date, bar code, two-dimensional code and other identification information. Commonly used are two-dimensional code coding on the metal lids of roll rings and glass bottles, production date coding on metal aluminum cans, cans, tinplates, and production information identification on metal profiles and 3C parts.
https://www.cllaser-technology.com/laser-marking-machine/fiber-laser-marking-machine/fiber-laser-coding-machine-for-metal.html