Buyer Guide

Fiber Laser Cutting Machine Double-Layer & Single-Layer Nozzle

Posted on by igolden

In a fiber laser cutting machine, nozzles play a critical role in controlling the flow of auxiliary gas (air, nitrogen, or oxygen) and directing the laser beam precisely onto the workpiece. Although small, the nozzle’s design significantly affects cutting quality, stability, and efficiency.

CNC Laser Cutting

Among various types, the two most common designs are the single-layer nozzle and the double-layer nozzle. Understanding their differences helps operators choose the right one for different materials and cutting methods.

we’re committed to delivering high-precision that meet the evolving needs of modern industries. Whether you’re processing carbon steel or stainless steel, choosing the right nozzle—double-layer vs. single-layer—can significantly influence your cutting performance, efficiency, and quality.

Nozzle Models

Nozzle Models
Serial Number Product Name Specifications
1 Nozzle Double Layer M11*Φ28*1.0
2 Nozzle Double Layer M11*Φ28*1.2
3 Nozzle Double Layer M11*Φ28*1.4
4 Nozzle Double Layer M11*Φ28*1.5
5 Nozzle Double Layer M11*Φ28*1.6
6 Nozzle Double Layer M11*Φ28*2.0
7 Nozzle Double Layer M11*Φ28*2.5
8 Nozzle Double Layer M11*Φ28*3.0
9 Nozzle Double Layer M11*Φ28*3.5
10 Nozzle Double Layer M11*Φ28*4.0
11 Nozzle Double Layer M11*Φ28*4.5
12 Nozzle Double Layer M11*Φ28*5.0
13 Nozzle Single Layer M11*Φ28*1.0
14 Nozzle Single Layer M11*Φ28*1.5
15 Nozzle Single Layer M11*Φ28*2.0
16 Nozzle Single Layer M11*Φ28*2.5
17 Nozzle Single Layer M11*Φ28*3.0
18 Nozzle Single Layer M11*Φ28*3.5
19 Nozzle Single Layer M11*Φ28*4.0
20 Nozzle Single Layer M11*Φ28*4.5
21 Nozzle Single Layer M11*Φ28*5.0
22 Nozzle Double Layer M14*Φ32*1.0
23 Nozzle Double Layer M14*Φ32*1.2
24 Nozzle Double Layer M14*Φ32*1.4
25 Nozzle Double Layer M14*Φ32*1.5
26 Nozzle Double Layer M14*Φ32*1.6
27 Nozzle Double Layer M14*Φ32*1.8
28 Nozzle Double Layer M14*Φ32*2.0
29 Nozzle Double Layer M14*Φ32*2.5
30 Nozzle Double Layer M14*Φ32*3.0
31 Nozzle Double Layer M14*Φ32*3.5
32 Nozzle Double Layer M14*Φ32*4.0
33 Nozzle Double Layer M14*Φ32*4.5
34 Nozzle 双层 M14*Φ32*5.0
35 Nozzle Single Layer M14*Φ32*1.0
36 Nozzle Single Layer M14*Φ32*1.2
37 Nozzle Single Layer M14*Φ32*1.4
38 Nozzle Single Layer M14*Φ32*1.5
39 Nozzle Single Layer M14*Φ32*1.6
40 Nozzle Single Layer M14*Φ32*1.8
41 Nozzle Single Layer M14*Φ32*2.0
42 Nozzle Single Layer M14*Φ32*2.5
43 Nozzle Single Layer M14*Φ32*3.0
44 Nozzle Single Layer M14*Φ32*3.5
45 Nozzle Single Layer M14*Φ32*4.0
46 Nozzle Single Layer M14*Φ32*4.5
47 Nozzle Single Layer M14*Φ32*5.0
48 Nozzle Single Layer M11*Φ28*1.4
49 Nozzle Single Layer M11*Φ28*1.6
50 Nozzle Single Layer M11*Φ28*1.8
51 Nozzle Single Layer M11*28*1.2
52 Nozzle Double LayerM11*Φ28*1.8
53 Nozzle Double Layer M11*Φ28*1.8

How to Choose the Right Nozzle

When selecting between single-layer and double-layer laser cutting nozzles, consider the following factors:

Application Need Recommended Nozzle
Thin carbon steel (<6mm) ✅ Single-Layer
Stainless steel or aluminum ✅ Double-Layer
Focused on speed ✅ Single-Layer
Focused on edge quality ✅ Double-Layer
Using oxygen/air cutting ✅ Single-Layer
Using nitrogen cutting ✅ Double-Layer

1. Gas Flow Rate

The most significant difference between the two types of nozzles lies in how they control the gas flow velocity:

Double-layer nozzles are engineered to accelerate the airflow through an inner core, allowing it to approach the speed of sound. This feature enhances the nozzle’s ability to expel molten material quickly, making it ideal for high-speed cutting of thicker or more viscous materials.

Single-layer nozzles, on the other hand, deliver a slower gas flow rate—usually below sonic speed. This design is better suited for precise, detailed cuts where accuracy is prioritized over speed.

2. Applicable Materials

Each nozzle type is suited for specific material types and applications:

Double-layer nozzles are widely used for oxygen cutting of carbon steel, thanks to their ability to efficiently blow away slag and enhance cutting stability.

Single-layer nozzles are commonly used for nitrogen cutting of stainless steel, aluminum, and other non-viscous materials. They offer cleaner, more controlled cuts without oxidation, which is essential for visible or cosmetic parts.

3. Cutting Effect and Surface Finish

The nozzle type directly impacts the cutting quality and surface results:

Double-layer nozzles typically enable faster cutting speeds but produce a wider kerf (cut width). Due to the use of oxygen, the cut surface may darken or oxidize, especially in thicker materials.

Single-layer nozzles result in narrower, smoother kerfs and maintain excellent edge quality. When combined with nitrogen, the oxidation effect is minimized, preserving a clean metal surface.

4. Recommended Use Cases

When selecting a nozzle, consider the material type, thickness, productivity goals, and surface finish requirements:

For thin plates under 3mm, particularly stainless steel, single-layer nozzles with nitrogen are ideal for precision and surface clarity.

For thicker carbon steel sheets above 8mm, double-layer nozzles with oxygen are recommended for speed and slag removal.

Pro Tips for Better Cutting Performance

  1. Use high-quality, precisely machined nozzles — tolerance errors cause unstable gas flow.
  2. Keep the nozzle clean — slag buildup affects laser focus and gas flow.
  3. Calibrate nozzle centering regularly — misalignment leads to uneven edges.
  4. Choose correct nozzle diameter (commonly 1.0mm–2.0mm) based on material thickness.
  5. Replace nozzles periodically to maintain consistent cutting results.

Conclusion

Both single-layer and double-layer nozzles have their respective advantages in the fiber laser cutting process. Understanding the differences will help you make informed decisions that optimize your cutting efficiency, quality, and overall machine performance. By selecting the appropriate nozzle for your specific applications, you can enhance productivity and achieve superior results in your fiber laser cutting projects.

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