How thick can you cut with Fiber Laser?
Fiber laser cutting has become one of the most important technologies in modern metal fabrication. Compared to older cutting methods, fiber lasers deliver higher speeds, tighter tolerances, and cleaner edges, making them ideal for precision manufacturing.
One of the most common questions engineers and buyers ask is:
“How thick of metal can a fiber laser actually cut?”
The answer depends on several factors, including laser power, material type, and the required edge quality. Let’s break down how thickness affects laser cutting and what modern systems can achieve.
Typical Fiber Laser Cutting Thickness
Modern fiber lasers can cut a wide range of materials and thicknesses. Higher-power machines dramatically increase cutting capability.
Below are typical cutting ranges for common materials.
Mild Steel (Carbon Steel)
1 kW laser: up to ~1/4 in (6 mm)
3–4 kW laser: up to ~1/2 in (12 mm)
6–8 kW laser: up to ~3/4 in (20 mm)
10 kW+ laser: up to ~1 in (25 mm)
Mild steel is often the most efficient material for laser cutting because oxygen assist gas can accelerate the cutting process.
Stainless Steel
3–4 kW laser: up to ~3/8 in (10 mm)
6–8 kW laser: up to ~5/8 in (16 mm)
10 kW+ laser: up to ~3/4 in (20 mm)
Stainless steel requires nitrogen assist gas to prevent oxidation, which results in very clean edges and excellent cosmetic quality.
Aluminum
3–4 kW laser: up to ~1/4 in (6 mm)
6–8 kW laser: up to ~1/2 in (12 mm)
10 kW+ laser: up to ~5/8 in (16 mm)
Aluminum reflects more laser energy than steel, so it can be slightly more challenging to cut at thicker gauges. However, modern fiber lasers handle aluminum extremely well.
Factors That Affect Cutting Thickness
While power level is important, several other factors influence how thick a fiber laser can cut.
Laser Power
Higher wattage lasers generate more energy, allowing them to cut thicker metals while maintaining edge quality.
For example, a 10 kW fiber laser can cut significantly thicker material than a 4 kW system.
Assist Gas
Fiber lasers rely on assist gases to remove molten metal from the cut.
Common gases include:
Oxygen – faster cutting for mild steel
Nitrogen – clean edges with no oxidation
Air – sometimes used for cost efficiency
The choice of gas affects both cutting speed and maximum thickness.
Edge Quality Requirements
Just because a laser can cut a certain thickness doesn’t always mean it should.
As material thickness increases, you may see:
Slightly rougher edges
Slower cutting speeds
More taper in the cut
For many applications, fabricators prefer to stay within the “optimal cutting range” for best results.
Why Fiber Lasers Excel at Thin to Medium Gauge Metals
Fiber lasers truly shine when cutting thin to medium thickness materials, where they deliver major advantages over other cutting methods.
Benefits include:
Extremely tight tolerances
Minimal heat distortion
Smooth edges with little finishing required
High production speeds
These advantages make fiber lasers ideal for industries such as:
equipment manufacturing
food processing equipment
automotive components
commercial fabrication
industrial enclosures
Fiber Laser Cutting at Dole Fabricating
At Dole Fabricating, we use modern fiber laser technology to deliver precise, repeatable parts for our customers.
Our facility operates:
4 kW fiber lasers
8 kW fiber lasers
10 kW fiber lasers
These machines allow us to efficiently cut a wide range of materials and thicknesses while maintaining the tight tolerances required for precision fabrication. Combined with our press brake forming, welding, powder coating, and ISO-registered quality system, we provide a complete fabrication solution from raw material to finished component.
✔ Have a part you need quoted?
Our team would be happy to review your drawings and help determine the best cutting method for your project.
Contact Dole Fabricating today to get started.