The QR codes on some products we hav£₩♠↔e seen are engraved by la÷>σ>ser marking machines. The principle←↕¶× of laser marking technology Ω×γλis to irradiate the surfacββ✔≠e of the workpiece with a hλ​¶igh-energy laser beam, and i¥¶αnstantly vaporize to form a →ασtwo-dimensional code. The↔←$ non-contact processing has littε≠♣£le impact on the workpi'©♠ece, and it can also be one ob♥↔÷​ject, one code, and the markin•‌π‍g has longevity.