Parameter Logic for Thick Plate Cutting

Carbon Steel Cutting up to 40mm–100mm

Cutting thick carbon steel requires a clear understanding of parameter coordination. Unlike thin sheet processing, thick plate cutting is highly sensitive to the balance between laser power, cutting speed, gas pressure, and focus position.

For carbon steel, oxygen is commonly used as the assist gas because it reacts with the metal and generates additional heat, improving cutting efficiency. However, this also means that parameter control must be precise to avoid excessive oxidation or slag formation.

Typical parameter considerations include:

• Lower cutting speed as thickness increases
• Higher laser power for deeper penetration
• Stable and sufficient oxygen pressure for slag removal
• Focus position adjusted below the material surface

Reference Cutting Parameters for Carbon Steel

Thickness	Power Range	Speed (approx.)	Gas Type
20–25 mm	6kW–12kW	Medium	Oxygen
30–40 mm	12kW–20kW	Lower	Oxygen
50–80 mm	20kW–60kW	Slow	Oxygen
80–100 mm	60kW–80kW	Very slow	Oxygen

As thickness increases, piercing time also becomes critical. Multi-stage piercing is often required for plates above 30 mm to prevent excessive spatter and protect the nozzle.

Improper parameter settings can lead to:

• Incomplete penetration
• Excessive slag
• Poor edge quality

Therefore, thick plate cutting requires careful adjustment and testing to achieve optimal results.

Stainless Steel Cutting with Nitrogen

Stainless steel cutting follows a different logic compared with carbon steel. Nitrogen is used as the assist gas to prevent oxidation and maintain a clean, bright cutting edge.

Unlike oxygen-assisted cutting, nitrogen cutting relies entirely on laser energy to melt the material. This means that higher laser power and precise parameter control are required.

Key considerations include:

• High gas pressure to remove molten material
• Stable laser power to ensure continuous cutting
• Accurate focus position for optimal energy concentration

Reference Cutting Parameters for Stainless Steel

Thickness	Power Range	Gas Pressure	Edge Quality
10–15 mm	6kW–12kW	Medium	Smooth
20–30 mm	12kW–20kW	High	High quality
30–50 mm	20kW–40kW	Very high	Stable

Because nitrogen cutting does not produce additional heat through oxidation, cutting speed is generally lower than carbon steel. However, the resulting edge quality is significantly better, reducing the need for post-processing.

Parameter Adjustment Based on Machine Model

Differences Between 3015H, 6025H and 8025H

Different machine models require different parameter strategies due to variations in working area, structural rigidity, and typical application scenarios.

The Hong Niu 3015H is mainly used for sheet metal processing, while the 6025H and 8025H are designed for heavy-duty applications involving larger plates and higher power levels.

Model Comparison

Model	Working Area	Typical Power	Application
3015H	3000×1500 mm	3kW–12kW	Sheet metal
6025H	6000×2500 mm	6kW–30kW	Heavy plate
8025H	8000×2500 mm	12kW–80kW	Large-scale heavy industry

In smaller machines, parameter settings focus on speed and efficiency for thin materials. In larger machines, stability and consistency become more important due to longer cutting paths and thicker materials.

For example:

• 3015H: Higher speed, lower power, thinner materials
• 6025H: Balanced parameters for medium to thick plates
• 8025H: Emphasis on stability and precision for long, thick cuts

Matching Power (3kW–80kW) with Material Thickness

Selecting the correct power level is essential for efficient cutting. Using insufficient power can result in incomplete cuts, while excessive power may lead to unnecessary energy consumption and reduced precision.

Power vs Thickness Matching

Power Level	Recommended Thickness Range
3kW–6kW	1–12 mm
6kW–12kW	10–25 mm
12kW–20kW	20–40 mm
20kW–30kW	30–60 mm
30kW–80kW	50–100 mm+

This relationship helps operators select appropriate machine configurations and parameter settings for specific applications.

Matching power with thickness ensures:

• Efficient energy use
• Stable cutting performance
• Reduced processing time

High Power Parameter Strategy

Gas Pressure, Focus Position and Speed Optimization

In high power laser cutting, parameter optimization becomes more complex due to the increased energy involved.

Gas pressure must be carefully controlled to ensure proper removal of molten material. Too low pressure leads to slag accumulation, while too high pressure can disturb the cutting process.

Focus position is another critical parameter. For thick plate cutting, the focus is typically set below the material surface to maximize energy penetration.

Cutting speed must be adjusted based on both thickness and power. Higher power allows faster cutting, but excessive speed can reduce edge quality.

Parameter Interaction

Parameter	Effect	Optimization Goal
Gas Pressure	Slag removal	Clean edge
Focus Position	Energy distribution	Deep penetration
Cutting Speed	Efficiency	Balance speed and quality

Proper coordination of these parameters is essential for achieving consistent cutting results.

Stability Control in Long-Time Cutting

High power cutting often involves long processing times, especially when cutting thick plates or large parts. Maintaining stability during these operations is critical.

Factors affecting stability include:

• Machine rigidity
• Cooling system performance
• Laser output consistency
• Motion control accuracy

To ensure stable long-time cutting, operators should:

• Monitor system temperature and cooling performance
• Maintain consistent gas supply
• Avoid sudden parameter changes during operation

Stability Comparison

Condition	Unstable Operation	Stable Operation
Cutting Quality	Inconsistent	Uniform
Edge Finish	Variable	Smooth
Machine Wear	Increased	Controlled
Production Efficiency	Reduced	Optimized

Stable operation not only improves product quality but also extends the lifespan of machine components.

Setting the correct cutting parameters is essential for achieving optimal performance with Hong Niu fiber laser cutting machines. From thick carbon steel cutting to precision stainless steel processing, each material requires a specific parameter strategy.

Different machine models, from 3015H to 8025H, require tailored approaches based on their structure and application range. Matching laser power with material thickness ensures efficient and stable operation.

For high power systems, careful optimization of gas pressure, focus position, and cutting speed is critical. Maintaining stability during long cutting cycles further ensures consistent quality and reliable production.

By understanding and applying these parameter principles, operators can maximize the efficiency, precision, and lifespan of fiber laser cutting machines in industrial applications.