1. Understanding Laser Power
Laser power, typically measured in kilowatts (kW), determines how much energy is delivered to the material per unit time. Higher power means more energy, which allows for cutting thicker materials or achieving higher speeds.
However, more power isn't always better - too much can overburn thin materials or lead to poor edge quality. Therefore, understanding the material type and thickness is key.
2. Recommended Laser Power by Material Type
A. Carbon Steel
Thin (≤ 3 mm): 1–2 kW is sufficient.
Medium (4–10 mm): 2–4 kW is recommended.
Thick (10–25 mm): 6–12 kW or more, depending on speed and edge quality requirements.
Carbon steel absorbs laser energy well and is easy to cut, making it suitable for a wide range of powers.
B. Stainless Steel
Thin (≤ 3 mm): 1.5–2 kW
Medium (4–8 mm): 3–6 kW
Thick (8–16 mm): 6–10 kW
Because stainless steel reflects more light and conducts heat less effectively, slightly higher power than carbon steel is typically needed.
C. Aluminum (High Reflectivity Material)
Thin (≤ 3 mm): 2–3 kW minimum
Medium (4–6 mm): 4–6 kW
Thick (6–12 mm): 8–12 kW, with optimized beam quality
Aluminum reflects and dissipates heat quickly, making it more challenging to cut. Higher power and specialized wavelengths (e.g. blue lasers) may improve results.
D. Copper and Brass (Very High Reflectivity)
Thin (≤ 2 mm): 2–4 kW minimum, preferably with green or blue laser sources
Thick (> 2 mm): High-power lasers (6–12 kW) or pulse lasers recommended
These metals can reflect and damage laser optics, so correct wavelength and protective measures are essential.
E. Non-metal Materials (Acrylic, Wood, Plastics)
CO₂ lasers (not fiber lasers) are typically used
Power range: 100 W to 500 W for most materials
Non-metals don't require high power but need precise control to avoid melting or burning.
3. Other Considerations
Cutting Speed: Higher power can increase speed on thick materials but may overheat thin sheets.
Edge Quality: Higher power may reduce dross on thick plates but can overburn edges if not tuned.
Assist Gas: Oxygen, nitrogen, or compressed air also influence how much power is needed.
Beam Quality & Focus Control: Even with high power, poor focus will result in suboptimal cutting.
Conclusion
Selecting the right laser power is a balance between material type, thickness, cutting speed, and quality requirements. Underpowering leads to incomplete cuts, while overpowering wastes energy and can damage the material. Always consult with machine manufacturers or integrators for professional guidance tailored to your application.
-- Rayther Laser Lyra Zhang
https://www.raytherlasercutter.com/laser-cutting-machine/fiber-laser-cutting-machine.html