Knowing suitable metal is essential for you to understand how to engrave metal. Fiber lasers are most suitable for marking all types of brass, copper, aluminum, stainless steel and nickel-plated metals, as well as engineering plastics such as polycarbonate. Aluminum is one of the best and most common metals used in metal engraving machines, and brass and copper are also ideal because both copper and brass have good heat transfer capabilities. Tungsten and cemented carbide are the hardest metals on earth, so engraving or etching is generally not recommended. Here are some metals that you can engrave with a high-efficiency fiber laser engraving machine. View more: Metal Laser Engraver