What is the cutting thickness for different materials with a laser cutting machine

Laser cutting machines are widely used in modern manufacturing, and their effective cutting thickness varies greatly according to material properties, laser power, auxiliary gas and processing parameters. Different metals and non-metallic materials have distinct thickness limits, which directly decide processing quality, efficiency and production cost.

Mild carbon steel is the easiest metal for fiber laser cutting. With 3kW laser, it can be smoothly cut within 10–12mm; 6kW equipment supports 20–22mm thick steel, and high-power 12kW lasers handle up to 35mm mild steel steadily. Oxygen auxiliary gas greatly improves penetration and cutting speed for carbon steel, forming clean sections with stable quality. Stainless steel has higher melting point and thermal stability. A 3kW laser cuts 8–10mm maximum, 6kW reaches 15–18mm, and thick stainless steel over 25mm needs ultra-high power lasers. Nitrogen gas is used to avoid oxidation and keep smooth, burr-free edges.

Aluminum alloy features strong light reflection and fast heat conduction, making it harder to cut. Conventional 3kW lasers only process aluminum below 8mm, while 12kW machines support up to 25mm thick plates. Copper and brass are typical high-reflective metals, with strict thickness restrictions: copper maxes at 12mm and brass at 8mm even with powerful fiber lasers, requiring precise parameter adjustment to prevent beam reflection damage.

For non-metallic materials, CO₂ lasers perform better. Acrylic, wood and plastic can be cut within 2–15mm. Thin paper, film and foam adapt low-power 40–80W lasers for ultra-thin precision processing. PVC materials are not recommended for laser cutting, as they produce toxic and corrosive smoke during heating.

In general, optimal cutting quality stays at 60%–80% of the maximum rated thickness. Excessively thick materials cause slow speed, rough surfaces and serious heat-affected zones. Reasonable matching of laser power, material thickness and working gas ensures stable, high-precision laser cutting in sheet metal processing, advertising crafts and industrial precision parts.