Carbon steel materials account for a part of the workpieces currently processed. Carbon steel is an iron-carbon alloy with a carbon content of 0.0218% to 2.11%. It also generally contains a small amount of silicon, manganese, sulfur, phosphorus and other elements. Theoretically, the higher the carbon content in carbon steel, the greater the hardness and strength, but the lower the plasticity. This article reveals the application advantages of fiber laser cutting, welding and cleaning carbon steel.