1. Nozzle Structure Selection (Single-Layer / Double-Layer)

1. Single-Layer Nozzle (S Type)

Application: Nitrogen cutting and air cutting.

Suitable for:

• Stainless steel

• Aluminum

• Galvanized steel

• Copper

• High-pressure nitrogen cutting

• Oxygen cutting of thick carbon steel on high-power (10kW+) machines

Advantages:

• Large gas flow rate

• Better protection against molten material back-splash

• Protects protective lenses

• Preferred for high-speed thin sheet cutting

2. Double-Layer Nozzle (D Type)

Application: Oxygen cutting of carbon steel.

Features:

• Built-in inner core structure

• Secondary gas flow concentration

• More stable laminar airflow

• Smoother cutting surface

Recommended for:

• Carbon steel oxygen cutting

• 3kW–6kW laser cutting machines

• Thin and medium-thickness carbon steel plates

3. High-Speed E-Type & Storm B-Type Nozzles (6–20kW High-Power Lasers)

E-Type High-Speed Double-Layer Nozzle

Suitable for:

• Oxygen cutting of carbon steel

• Thickness: 12–25 mm

B-Type Storm Nozzle

Suitable for:

• Nitrogen cutting of stainless steel

• Thickness: Above 12 mm

Advantages:

• Large nozzle diameter

• High gas flow capacity

• Excellent slag removal performance

2. Nozzle Diameter Selection

General Rule:

The thicker the material, the larger the nozzle diameter required.

A. Carbon Steel (Oxygen Cutting)

Double-layer nozzles are generally recommended.

Characteristics:

• Small diameters provide narrow kerf and high cutting speed.

• Larger diameters provide sufficient gas flow for slag removal on thick plates.

B. Stainless Steel & Aluminum (Nitrogen Cutting)

Single-layer nozzles are recommended.

Characteristics:

• Small diameters with high-pressure nitrogen produce oxidation-free cutting edges.

• Larger diameters improve molten material removal on thick plates.

C. Air Cutting (Thin Sheets)

Suitable for:

• Carbon steel ≤ 2 mm

• Stainless steel ≤ 2 mm

Recommended Nozzle Diameter:
Φ1.2–1.5 mm

3. Nozzle Selection by Laser Power

1–3kW Low-Power Laser Machines

Carbon Steel (Oxygen Cutting)

• Use double-layer nozzles.

• Recommended diameter: Φ1.2–1.5 mm for thin sheets.

Stainless Steel (Nitrogen Cutting)

• Use single-layer nozzles.

• Recommended diameter: Φ1.0–1.5 mm.

• Maximum recommended diameter: Φ2.0 mm.

Note:
Low-power machines are not suitable for oversized nozzle diameters.

4–6kW Medium-Power Laser Machines

Carbon Steel

• Up to 8 mm: Double-layer nozzle.

• Above 8 mm: Φ2.0–2.5 mm double-layer nozzle.

Stainless Steel

• 3–10 mm thickness:

  • Single-layer nozzle

  • Φ1.8–2.0 mm

8–20kW High-Power Laser Machines

Carbon Steel (Above 12 mm)

• E-Type high-speed double-layer nozzle recommended.

Stainless Steel (Above 12 mm)

• B-Type Storm large-diameter single-layer nozzle recommended.

Thin Sheet Processing

• Continue using standard Φ1.2–1.5 mm nozzles for maximum cutting speed.

4. Verify Nozzle Thread Specifications Before Purchase

Always confirm nozzle compatibility with the cutting head.

Common Thread Specifications

5. Important Selection and Adjustment Guidelines

1. Avoid Incorrect Nozzle Sizes

Thin Sheets + Large Nozzle

May cause:

• Burned edges

• Excessive burrs

• Poor cutting quality

Thick Plates + Small Nozzle

May cause:

• Insufficient gas flow

• Incomplete cutting

• Heavy slag adhesion on the bottom edge

2. Recalibration After Nozzle Replacement

After changing a nozzle, always perform:

• Nozzle centering alignment

• Capacitive sensor calibration

Failure to calibrate may result in:

• Nozzle damage

• Ceramic ring damage

• Protective lens damage

3. Choose Copper Nozzles Whenever Possible

Advantages over brass nozzles:

• Better thermal conductivity

• Better electrical conductivity

• Higher temperature resistance

• Longer service life

Recommended concentricity accuracy:
≤ 0.03 mm

6. Quick Selection Guide

Carbon Steel + Oxygen → Double-Layer Nozzle
Stainless Steel + Nitrogen → Single-Layer Nozzle
Thin Sheets → Small Diameter (≈1.2 mm)
Medium Thickness → 1.5 mm General-Purpose Size
Thickness Above 10 mm → Increase Nozzle Diameter
High-Power Thick Plate Cutting → Use E-Type or B-Type High-Speed Nozzles
Always Verify Thread Compatibility Before Purchase
Recalibrate Centering and Capacitance After Every Nozzle Change