A 20W fiber laser marking machine is a type of industrial laser system that uses a high-power fiber laser to create permanent markings on a variety of materials. The machine typically consists of a laser source, a marking head, and a control system. The laser emits a concentrated beam of light that can be focused to create very precise and detailed markings. The machine is commonly used in industries such as automotive, aerospace, electronics, and medical devices for marking logos, serial numbers, barcodes, and other types of identification. It is known for its high accuracy, fast marking speed, and low maintenance requirements.