Fiber Laser Cutting Thickness & Speed Chart: 1kW to 20kW Complete Guide
Understanding what a fiber laser cutting machine can actually cut — and how fast — is one of the most common questions we hear from buyers. Whether you’re researching a machine purchase, comparing quotes, or trying to figure out if a specific job is feasible, having accurate thickness and speed data is essential.
In this guide, we’ve compiled real-world cutting parameters for fiber laser power levels from 1000W all the way up to 20000W, across the most common metal materials. Use these charts as a reference for your production planning and machine selection.
Fiber Laser Cutting Thickness Chart by Power & Material
The following table shows the maximum recommended cutting thickness for each laser power level across common metals. These are practical production values — not theoretical limits. Cutting at maximum thickness will be slower and may require multiple passes or specialized gas settings.
| Laser Power | Carbon Steel (Mild Steel) | Stainless Steel | Aluminum | Copper | Brass | Galvanized Steel |
|---|---|---|---|---|---|---|
| 1000W | 10 mm | 5 mm | 3 mm | 2 mm | 2 mm | 4 mm |
| 1500W | 12 mm | 6 mm | 4 mm | 3 mm | 3 mm | 5 mm |
| 2000W | 16 mm | 8 mm | 5 mm | 4 mm | 4 mm | 6 mm |
| 3000W | 20 mm | 12 mm | 8 mm | 5 mm | 6 mm | 8 mm |
| 4000W | 25 mm | 16 mm | 10 mm | 6 mm | 8 mm | 10 mm |
| 6000W | 30 mm | 20 mm | 12 mm | 8 mm | 10 mm | 12 mm |
| 8000W | 35 mm | 25 mm | 16 mm | 10 mm | 12 mm | 14 mm |
| 12000W | 50 mm | 30 mm | 20 mm | 12 mm | 15 mm | 16 mm |
| 20000W | 60 mm+ | 40 mm | 30 mm | 16 mm | 20 mm | 20 mm |
Note: Values are for reference only. Actual cutting capacity depends on machine configuration, assist gas type, nozzle size, focus position, and material quality. Always test with your specific material before production.
Fiber Laser Cutting Speed Chart (m/min)
Cutting speed varies dramatically based on material thickness and laser power. Below are typical cutting speeds for common material and power combinations. These are production-quality speeds — meaning clean, dross-free cuts with good edge quality.
Carbon Steel (Mild Steel) Cutting Speed
| Thickness | 1000W | 2000W | 3000W | 6000W | 12000W | 20000W |
|---|---|---|---|---|---|---|
| 1 mm | 20 m/min | 35 m/min | 40 m/min | — | — | — |
| 2 mm | 12 m/min | 22 m/min | 30 m/min | 40 m/min | — | — |
| 3 mm | 8 m/min | 16 m/min | 22 m/min | 35 m/min | 40 m/min | — |
| 5 mm | 4 m/min | 8 m/min | 14 m/min | 22 m/min | 30 m/min | 35 m/min |
| 8 mm | 1.5 m/min | 4 m/min | 7 m/min | 14 m/min | 22 m/min | 28 m/min |
| 10 mm | 0.8 m/min | 2.5 m/min | 4.5 m/min | 10 m/min | 18 m/min | 24 m/min |
| 12 mm | — | 1.5 m/min | 3 m/min | 7 m/min | 14 m/min | 20 m/min |
| 16 mm | — | 0.6 m/min | 1.5 m/min | 4 m/min | 9 m/min | 14 m/min |
| 20 mm | — | — | 0.8 m/min | 2.5 m/min | 6 m/min | 10 m/min |
| 25 mm | — | — | — | 1.5 m/min | 4 m/min | 7 m/min |
| 30 mm | — | — | — | 0.8 m/min | 2.5 m/min | 5 m/min |
Assist gas: Oxygen for carbon steel. Speeds are approximate and vary by machine brand, material quality, and cut quality requirements.
Stainless Steel Cutting Speed
| Thickness | 1000W | 2000W | 3000W | 6000W | 12000W |
|---|---|---|---|---|---|
| 1 mm | 18 m/min | 30 m/min | 36 m/min | — | — |
| 2 mm | 10 m/min | 18 m/min | 25 m/min | 35 m/min | — |
| 3 mm | 6 m/min | 12 m/min | 18 m/min | 28 m/min | 35 m/min |
| 5 mm | 2.5 m/min | 6 m/min | 10 m/min | 18 m/min | 25 m/min |
| 8 mm | 0.8 m/min | 2.5 m/min | 4.5 m/min | 10 m/min | 16 m/min |
| 10 mm | — | 1.2 m/min | 2.5 m/min | 6 m/min | 12 m/min |
| 12 mm | — | 0.6 m/min | 1.5 m/min | 4 m/min | 8 m/min |
| 16 mm | — | — | 0.6 m/min | 2 m/min | 5 m/min |
| 20 mm | — | — | — | 1 m/min | 3 m/min |
Assist gas: Nitrogen for stainless steel (for oxide-free, bright cuts). Nitrogen consumption increases significantly with thicker materials.
Aluminum Cutting Speed
| Thickness | 1500W | 3000W | 6000W | 12000W |
|---|---|---|---|---|
| 1 mm | 15 m/min | 25 m/min | 35 m/min | — |
| 2 mm | 8 m/min | 15 m/min | 25 m/min | 35 m/min |
| 3 mm | 4 m/min | 9 m/min | 16 m/min | 25 m/min |
| 5 mm | 1.5 m/min | 4 m/min | 8 m/min | 15 m/min |
| 8 mm | — | 1.5 m/min | 3.5 m/min | 8 m/min |
| 10 mm | — | 0.8 m/min | 2 m/min | 5 m/min |
| 12 mm | — | — | 1.2 m/min | 3.5 m/min |
| 16 mm | — | — | 0.5 m/min | 2 m/min |
| 20 mm | — | — | — | 1 m/min |
Note: Aluminum is highly reflective. Older fiber laser models may struggle with thicker aluminum. Modern machines with anti-reflection technology handle aluminum much better.
Factors That Affect Cutting Speed & Quality
The charts above provide baseline numbers, but many factors influence real-world cutting performance. Here are the most important ones:
1. Assist Gas Type & Pressure
The choice of assist gas dramatically affects both cut quality and speed:
- Oxygen: Used for carbon steel. The exothermic reaction actually adds energy to the cut, increasing speed. Produces an oxidized (black) edge.
- Nitrogen: Used for stainless steel, aluminum, and when clean, oxide-free edges are required. Produces a bright, shiny edge. Much higher gas consumption than oxygen.
- Compressed Air: A cost-effective option for thinner materials. Quality falls between oxygen and nitrogen. Good for general-purpose cutting where edge finish isn’t critical.
2. Material Quality & Surface Condition
Rusty material, oily surfaces, or inconsistent material thickness can all reduce cutting speed and quality. Galvanized steel and coated materials may require parameter adjustments compared to bare metal.
3. Laser Beam Quality (BPP)
Not all lasers of the same wattage cut the same. Beam quality, measured as BPP (Beam Parameter Product), determines how tightly the laser can be focused. Lower BPP = better beam quality = faster, cleaner cuts. Premium laser sources (like IPG, Raycus high-end models) typically have better beam quality than budget alternatives.
4. Machine Dynamics & Motion System
For thin sheet cutting, the machine’s acceleration and positioning speed often matter more than raw laser power. A machine with fast linear motors and high acceleration will outperform a slower machine with the same laser power on thin materials.
5. Nozzle Size & Focus Position
Proper nozzle selection and focus position are critical for optimal cutting. Too large a nozzle wastes gas; too small can cause plasma buildup. The optimal focus position varies by material and thickness — usually slightly below the surface for thicker material and at or above the surface for thin sheet.
How to Choose the Right Laser Power
Selecting the right power level is a balance between your current needs and future growth. Here’s our general recommendation:
If you primarily cut thin sheet (≤3mm): 1000W–1500W is usually sufficient. The speed difference between 1500W and 3000W on thin material is relatively small, and the lower power machine costs less to operate.
If you cut a mix of thin and medium (≤10mm): 2000W–3000W is the sweet spot for most job shops. It handles the majority of common metal fabrication work with good speed and quality.
If you regularly cut thick plate (10mm–25mm): 6000W–8000W gives you good productivity on thick material while still being efficient on thinner sheets.
If you need heavy plate capability (25mm+): 12000W+ is required. These high-power machines are typically used by heavy industry, shipbuilding, and structural steel fabricators.
💡 Pro tip: When in doubt, go one power level higher than you think you need. The additional cost is often modest compared to the flexibility and future-proofing it provides. See our complete fiber laser buying guide for more details →
Common Misconceptions About Laser Power
Myth: More watts = always faster
Reality: Not always. On thin material (1-3mm), a 1500W machine can cut nearly as fast as a 3000W machine because the limiting factor is machine acceleration, not laser power. The extra wattage only helps when cutting thicker materials.
Myth: All 3000W lasers are the same
Reality: Laser source quality, beam delivery, and machine design all matter. A well-designed 2000W machine from a reputable manufacturer may outperform a cheap 3000W machine, especially on precision work.
Myth: Higher power costs more to run
Reality: Not proportionally. While higher power machines do use more electricity, they also cut faster, so the energy cost per part can actually be lower. The biggest operating cost difference is usually in nitrogen consumption for thick stainless steel cutting.
Get a Customized Recommendation
Every application is different. If you’re trying to figure out exactly what machine you need, contact our engineering team with the following information and we’ll provide a customized recommendation:
- Primary materials you cut (and thickness ranges)
- Typical production volume (sheets per day/week)
- Required cut quality (structural / cosmetic / precision)
- Available floor space
- Budget range
We can also provide sample cutting tests with your material — just send us a sample and we’ll cut it on our machines and send you the results.
Related Resources
- How to Choose a Fiber Laser Cutting Machine: Complete Buyer’s Guide
- Fiber Laser vs CO2 vs Plasma: Which One Should You Choose?
- Finding the Right Fiber Laser Cutting Machine Manufacturer
- Transon Fiber Laser Cutting Machines — Full Product Range
Wondering how much these machines cost? Check our complete fiber laser cutter price guide for 2026 pricing.
Further Reading: Check out our ranking of the 12 Best Fiber Laser Cutting Machine Brands & Manufacturers to see how the top manufacturers compare.
Explore our full range of industrial fiber laser cutters from Transon Laser. Contact us today for a free quote on our 1500W fiber laser cutting machine.