With the development of laser cutting technology, sheet fiber laser cutting machines have become essential production equipment in industries such as sheet metal processing, machinery manufacturing, automotive parts, elevators, home appliances, kitchenware, power equipment, construction machinery, and aerospace.

Compared to traditional plasma cutting, flame cutting, and machining methods, fiber laser cutting offers advantages such as high speed, high precision, small heat-affected zone, good cut quality, high automation, and high material utilization.

However, to truly maximize the performance of a fiber laser cutting machine, simply owning a high-configuration device is far from sufficient. Operators must also master scientific cutting processes, reasonable parameter settings, and standardized equipment maintenance methods. The following will comprehensively analyze the usage techniques of sheet fiber laser cutting from multiple perspectives.

1. Preparation Techniques Before Sheet Fiber Laser Cutting

1) Check Equipment Status

Before starting sheet fiber laser cutting machine each day, check the following:

- Laser operating status

- Chiller temperature

- Coolant level

- Air compressor pressure

- Gas pressure

- Guide rail lubrication status

- Laser head protective lens

- Nozzle damage

- Ceramic ring integrity

Especially the protective lens. Severe contamination will directly affect cutting quality.

Recommendation:

Check the protective lens at least once per shift.

2) Check Sheet Material Quality

Many cutting problems actually originate from the sheet material.

Focus on checking:

- Rust

- Oil stains

- Coating

- Smoothness

- Oxygen layer

- Wave deformation

For example:

Severe oil stains on the surface of 304 stainless steel will cause:

- Increased slag

- Yellowing of the cut

- Abnormal sparks

Therefore:

It is best to clean the sheet material before cutting.

3) Select the Correct Nozzle

Different materials require different nozzles.

General recommendations:

Nozzle centering must be calibrated.

Offset exceeding 0.1mm, will affect:

- Airflow

- Beam

- Cut quality

2. Core Ideas for Parameter Setting

Fiber laser cutting isn't just about power.

Many parameters truly affect quality:

Power, Speed, Focal Point Position, Nozzle Diameter, Gas Pressure, Gas Type, Pulse Frequency/Duty Cycle (for some conditions), Drilling Method, Cutting Sequence and Path. Parameter Matching Principles

Simply put:

Low Power: Incomplete cut, slag buildup, rough kerf.

Slow Speed: Excessive heat, wider kerf, edge ablation, slag buildup at the bottom.

High Speed: Incomplete cut, broken edges, localized wire pulling.

Incorrect Focal Point: Slanted kerf, wider at the top than the bottom, or vice versa, increased burrs.

Inappropriate Gas Pressure: Blackened kerf, poor slag removal, molten slag adhesion.

Therefore, the recommended order for process debugging is:

First determine the material and thickness → then determine the gas → then adjust the power → then adjust the speed → then adjust the focal point → finally fine-tune the nozzle and gas pressure.

3. Appropriate Selection of Assist Gas

The assist gas directly determines the cutting quality.

1) Oxygen Cutting Techniques

Suitable for: Carbon steel

Features:

Utilizes combustion to increase energy.

Fast cutting speed for thick plates.

Low cost.

Disadvantages:

Easy to cut: Blackening and oxidation

2) Nitrogen Cutting Techniques

Suitable for: Stainless steel; Aluminum plate; Galvanized plate

Advantages:

Cut: Whitening; No oxidation; Can be directly welded

Requirements:

Best purity:≥99.99%

Pressure: General 12~25 Bar

3) Air Cutting Techniques

Suitable for: Thin plates

Advantages:

Lowest cost; No need for large amounts of nitrogen

Common industries:

Advertising industry; Chassis and cabinet; Sheet metal parts

4. Nozzle and Lens Management

1) Nozzle Techniques

Larger nozzles are not necessarily better, nor are smaller nozzles better.

- Too small a nozzle: Insufficient airflow, poor slag removal.

- Too large a nozzle: Airflow diverges, resulting in a rough cut.

- Misaligned nozzles: Skewed cuts, increased burrs, unstable perforation.

Recommendations:

Check concentricity every time you change nozzles.

If a sudden deterioration in the cut is observed during production, first check for nozzle burn-out or misalignment.

Use different nozzle sizes for thick and thin plates.

2) Lens Maintenance

Protecting lenses from contamination is a very common source of failure.

Symptoms:

- Power reduction

- Unstable cutting

- Rough cuts

- Frequent alarms

Recommendations:

Regularly check lenses for fogging, black spots, and burn marks.

Avoid using inappropriate wiping methods.

Keep the lens area clean before and after production.

If any abnormality is found, address the lens issue first before adjusting parameters.

5. Focus Adjustment Techniques

Focus position determines the cutting effect.

General rule:

Focus on the surface of the sheet material

Suitable for: High-speed cutting of thin sheets.

Characteristics: Fineest cut.

Focus slightly below the surface

Suitable for: Medium to thick plates.

Benefits: More stable cuts

Focus inside the plate

Suitable for: Thick plate cutting.

Able to:

Improve melting efficiency

Improve slag formation

Experience:

Different laser head brands:

Focus settings vary.

Recommendation:

Do not completely copy other people's parameters.

6. Drilling Techniques

Drilling is a crucial factor affecting efficiency.

1) Ordinary Drilling

Suitable for: Thin plates.

Fastest speed.

2) Progressive Drilling

Suitable for: Carbon steel over 10mm.

Advantages:

Reduces burst and spatter

3) Spiral Drilling

Suitable for: Thick plates.

Can Reduce: Heat concentration.

4) Multi-stage Drilling

Increasingly adopted by high-end equipment:

First-stage preheating, second-stage drilling, third-stage cutting

Significantly improved drilling quality.

7. Techniques for Increasing Cutting Speed

Many people mistakenly believe:

The faster the better.

In reality:

- Too fast can lead to incomplete cut and burrs

- Too slow easily leads to corched edges and slag

Optimal speed judgment: Observe the sparks.

Normal sparks: Evenly downward spray.

If: Spraying after spark test

Explanation: Speed too fast.

If: Spraying before spark test

Explanation: Speed too slow.

8. Techniques to Reduce Chilling

Chilling usually comes from:

① Incorrect focus

② Insufficient air pressure

③ Incorrect speed

④ Damaged nozzle

⑤ Lens contamination

Solution:

Check each item one by one.

Usually:

Over 80% of problems come from:

Focus and speed.

9. Techniques to Prevent Edge Burning

Especially when cutting:

Small holes

Sharp corners

Thin strips

Techniques:

Reduce power

Use:

Slow down at corners.

Add:

Lead-in

Lead-out

Avoid:

Heat concentration.

10. Small Hole Cutting Techniques

Experience:

Optimal Hole Diameter≥ Plate Thickness.

Example: 6mm Plate

Recommendation: Hole Diameter ≥6mm

Otherwise:

Prone to deformation.

Use:

High-Frequency Pulse Cutting.

Improves:

Roundness.

11. Sharp Corner Cutting Techniques

Sharp corners are most prone to: Burning.

Solution:

Add to CAD: Corner Compensation.

Control System Enable: Corner Compensation.

12. Micro Joint Techniques

Micro Joint:

Preserves: 0.2~1mm

Connection Point.

Advantages:

Prevents Part Warping.

Reduces Head Collision.

Suitable for:

Automatic Loading and Unloading.

13. Layout Techniques

Proper layout can improve material utilization.

Recommendation:

Use Automatic Nest.

Note:

Ensure parts are oriented in the same direction

Ensure even heat distribution

Cut larger parts first

Cut smaller parts last.

Material utilization can be improved by: 5%–15%.

14. Cutting Techniques for Different Materials

1) Carbon Steel Cutting Techniques

Carbon steel is most commonly cut with oxygen. The key technique lies in controlling the "reaction cutting."

Recommendations:

For thick plates, oxygen is preferred due to its high efficiency and strong cutting ability.

For thin plates, high-pressure nitrogen can be used to achieve an oxidation-free cut.

Maintain a stable cutting speed and avoid frequent sudden stops and starts.

Avoid over-burning during piercing to prevent collapse of the piercing opening.

Common Problems and Solutions:

Bottom slag: Slow speed, low focal point, weak gas pressure.

Blackened cut: Insufficient oxygen purity or speed mismatch.

Jerky edges: Plate vibration, nozzle eccentricity, poor guide rail precision.

2) Stainless Steel Cutting Techniques

Stainless steel usually prioritizes appearance, and nitrogen cutting is the most common method.

Recommendations:

High nitrogen purity and sufficient pressure are essential.

When aiming for a bright cut, precise focus adjustment is crucial.

Thin plates require careful heat input control to avoid localized overheating.

For complex shapes, reduce speed or use corner compensation at corners.

Common Problems:

Yellowing or blackening of the cut: Insufficient air pressure, slow speed, focus deviation.

Drossing at the bottom: Too slow speed or unsuitable nozzle.

Rough cut: Plate deformation, unstable airflow, lens contamination.

3) Aluminum Plate Cutting Techniques

Aluminum plates have high thermal conductivity and strong reflectivity, making them more difficult to cut stably than carbon steel.

Recommendations:

Prioritize ensuring a stable optical path, anti-reflection protection, and gas flow.

Select appropriate nozzles to avoid excessive airflow dispersion. Focusing should not be arbitrary; multiple trial cuts are usually required. Securely fix the sheet metal to prevent warping due to heat deformation.

Common Problems:

Incomplete cut: Insufficient power or excessive speed. Large burrs on the cut: Inaccurate focus or unstable air pressure. Reflective alarm: Poor material surface condition or improper process settings.

4) Galvanized Steel Sheet Cutting Techniques

The most troublesome aspects of galvanized steel sheet cutting are smoke, dust, splashes, and the effects of the coating.

Recommendations:

A powerful exhaust system is essential. Before trial cutting, confirm the coating's impact on the cut and perforation. Frequently check the nozzles and protective lenses. Avoid continuous, dense perforation to prevent localized overheating.

15. Key Techniques for Thick Plate Cutting

The three biggest concerns in thick plate cutting are: incomplete cut, heavy slag buildup, and large heat deformation.

Key points for thick plate cutting techniques:

Drilling should be steady, not rushed.

High gas purity is essential.

Nozzle, focus, and air pressure must be matched.

It's better to be slightly slower than blindly pursuing speed.

When cutting thick plates, slag removal and blowing ability are more important than surface speed.

Experience-based judgment:

If the following occurs:

Normal top edge, severe slag buildup at the bottom edge; Unstable, intermittent kerf; Noticeable reddening or deformation of part edges

This usually indicates that the process is not based on stable drilling and slag removal. Prioritize adjusting the drilling method, air pressure, and focus, rather than simply increasing power.

16. Techniques to Reduce Thermal Deformation

Continuous Cutting:

Heat Accumulation.

Recommendations:

- Skip Cutting

- Island Cutting

- Sectional Cutting

17. Cutting Path Optimization Techniques

Principles to Follow:

Inner Holes First.

Outer Contours Later.

Reasons:

Avoid: Part Movement.

18. Automatic Edge Finding Techniques

Modern Laser Machines:

Support: Automatic Edge Finding.

Especially For Scrap Sheets:

Can Save A Significant Amount of Material.

19. Daily Maintenance Techniques

For sheet fiber laser cutting machines to achieve long-term stability, maintenance is more important than machine tuning.

Daily tasks:

- Clean the workbench and cutting head area.

- Check gas pressure.

- Check cooling water temperature.

- Inspect nozzles and protective lenses.

- Clean up fumes and splatter residue.

Weekly tasks:

- Inspect guide rails, racks, and transmission components.

- Check fume extraction efficiency.

- Check optical path status.

- Verify process parameters for drift.

Long-term maintenance priorities:

- Maintain a constant equipment temperature.

- Maintain gas purity.

- Maintain mechanical precision.

- Replace wear parts promptly.

20. Quick Solutions To Common Problems

21. Comprehensive Recommendations for Improving Fiber Laser Cutting Efficiency

To fully utilize the performance of fiber laser cutting machines for sheet metal, continuous optimization is needed across multiple aspects, including equipment, processes, personnel, and management:

- Establish a standardized cutting parameter library: Establish a process database based on material type, thickness, and power to reduce repetitive debugging time.

- Select appropriate laser power: Avoid using high power for thin sheets or low power for thick sheets, ensuring the equipment always operates within its optimal efficiency range.

- Optimize nesting and cutting paths: Employ intelligent nesting software to rationally plan the cutting sequence, improving material utilization and reducing idle travel.

- Strengthen daily equipment maintenance: Regularly inspect protective mirrors, nozzles, ceramic bodies, guide rail lubrication, and cooling systems to maintain stable equipment operation.

- Maintain a stable auxiliary gas supply: Ensure gas purity and pressure meet process requirements to avoid cutting defects caused by gas quality issues.

- Train operators: Improve their ability to adjust focus points, piercing methods, speed matching, and identify abnormal phenomena, reducing quality fluctuations caused by human factors.

- Utilize intelligent monitoring functions: Fully utilize functions such as automatic edge finding, collision protection, cutting monitoring, and remote diagnostics to improve production continuity and safety.

- Continuous process optimization: Based on the characteristics of different materials and orders, we continuously summarize experience and optimize parameters to achieve the optimal balance between efficiency, quality, and cost.

Summary:

Metal sheet fiber laser cutting is an advanced manufacturing technology that integrates equipment performance, process parameters, material properties, and operational experience. Excellent cutting quality does not solely rely on high-power equipment; it requires systematic management in areas such as focus control, auxiliary gas selection, nozzle status, cutting speed, piercing process, path planning, and equipment maintenance.

For enterprises, establishing comprehensive process specifications and maintenance systems can significantly improve cutting efficiency and processing quality, extend equipment lifespan, reduce production costs, and provide a solid guarantee for intelligent and digital sheet metal processing. Integrating these usage techniques into daily production practices can fully unleash the performance potential of fiber laser cutting equipment, achieving high-efficiency, high-precision, and high-stability processing goals.