How Thick Can a Fiber Laser Cut? A Guide by Power LevelThe honest answer to "how thick can this machine cut" is two numbers, and most suppliers only quote the larger one.The first is the separation limit: the thickness at which the beam will go through the plate and the part drops free. The second is the production limit: the thickness you can cut all day, at acceptable speed, with a clean edge and a nozzle that survives a full shift. In practice they differ by a wide margin.Separation limits by powerThe table below reflects typical single-mode and multi-mode fiber sources cutting with correct gas and focus. Treat these as the upper edge of what is possible, not as daily production capability.Laser powerCarbon steel (O₂)Stainless steel (N₂)Aluminium (N₂)1.5 kW12–16 mm4–6 mm3–5 mm3 kW18–22 mm8–10 mm6–8 mm6 kW22–25 mm12–16 mm10–14 mm12 kW30–40 mm20–30 mm18–25 mmThree caveats sit behind that table.Carbon steel thickness depends on oxygen-assisted cutting, so the edge is oxidised and the cut face is not suitable for welding without cleaning. Stainless and aluminium are cut with nitrogen, which is why they thin out faster as thickness climbs: nitrogen cutting consumes far more energy per millimetre.Beyond roughly 20mm on carbon steel, plasma or waterjet often beats laser on cost per metre. Laser wins on edge quality and on thin-to-medium plate, and that advantage shrinks as thickness rises.Air cutting changes the numbers again. Air is cheaper than nitrogen and works on thin material, but the edge oxidises, so it is not a substitute for nitrogen on visible stainless parts.Why the production limit is lowerRunning a machine at its separation limit means running at minimum speed with maximum power. Three things follow.Consumables wear fast. Laser nozzles, protective lenses and ceramics degrade faster at high power density, and the cost per part can double even though the machine technically made the cut.Quality drops. The kerf widens, dross appears on the underside, and the edge angle gets steeper. On stainless above about 10mm, the edge often needs a secondary operation anyway, which is where a CNC press brake enters the process rather than the laser.Repeatability suffers. A process running at 95 percent of its capability has little tolerance for a change in plate chemistry or a slightly worn nozzle, and the failure mode is a failed cut mid-nest rather than a slightly worse part.For daily production, a working rule is to stay 20 to 30 percent below the separation limit. A 6kW machine cutting 25mm carbon steel occasionally is realistic. The same machine cutting 25mm all day is not.The variables that decide the real numberNozzle diameter and condition come first. A worn nozzle changes the gas flow pattern, and the effect on cutting capacity is larger than most operators expect. Inspecting nozzles at the start of each shift catches most of this.Focus position comes second. Thick plate wants a focus position below the surface for carbon steel and n...

The nozzle often used for the 6 kW laser is a conical nozzle.There are three main forms of nozzles: parallel, collected and cone forms, 6 kW laser nozzle often used the most is the conical nozzle, the conical nozzle has good cutting quality, high cutting precision advantages. For nitrogen cutting stainless steel, and then precision, surface requirements are relatively high fine cutting.

1. laser cutting nozzle sp high-speed single and double layer, the use of T3 grade copper, with excellent electrical and thermal conductivity, nozzle cutting speed, cutting surface finish is high, long life, one-time processing molding, the inner wall is smooth, oxidation treatment area.2. laser cutting nozzle se is the use of conventional single-layer high-speed double-layer pressurization, different from ordinary copper brass, the use of T3 imported copper, high induction, excellent electrical and thermal conductivity, CNC milling machine, drilling, grinding, tapping, high precision, small error variety guarantee.

In the process of producing the nozzle of the laser cutting machine, different models will be represented by different English letters. Where d represents the general horizontal distance and s represents the oblique distance.Laser nozzles are divided into single and double layers. Single-layer laser nozzle is used for melting cutting, that is, nitrogen as auxiliary gas, cutting stainless steel and aluminum plate with single-layer laser nozzle. Double-layer laser nozzles are generally used for oxidation cutting, that is, using oxygen as an auxiliary gas to cut carbon steel with double-layer laser nozzles.

Because of its high gas flow rate, the double-layer nozzle is generally used for high-speed cutting, and the single-layer laser nozzle is used for melting cutting, which uses nitrogen as an auxiliary gas.The nozzle is a very common loss on the laser cutting machine, but also a very important part of the laser cutting, it is located at the bottom of the laser head, very close to the workpiece, so it plays a very key role in the cutting process.