Contents
Most people spend months choosing the right laser cutting machine. Then the machine arrives, and they discover they also need a large, heavy compressed air system — one that requires its own electrical supply and installation time. This guide covers everything you need to plan for before your machine arrives.
All specifications in this guide are based on DHH (Dehaha) screw compressor systems validated for use with fiber laser cutting machines. They represent recommended configurations, not minimum acceptable specifications. If you are unsure which option fits your situation, contact the GWEIKE team for a specific recommendation.
Why Air Quality Matters for Your Laser
When you cut with air assist, the compressed air does three jobs: it blows the molten material out of the cut, it cools the cut edge, and it protects the cutting lens from smoke and debris. If the air is dirty, wet, or has oil in it, all three jobs suffer — and you may not notice until the lens is already damaged.
The air quality standard for laser cutting requires:
- Particle size: ≤ 0.01 μm (that is one hundredth of a micron — invisible to the eye)
- Oil content: ≤ 0.003 PPM (essentially oil-free)
- Moisture: Dew point 2–10°C for standard cutting; -20 to -40°C for 10KW+ systems
A standard workshop air compressor does not meet these standards. That is why laser-grade systems include a refrigerated air dryer, precision filters, and (at higher power levels) a desiccant dryer as part of the package.
Why You Need 16 Bar — Not the Standard Factory Pressure
Most factory pneumatic systems run at 6–8 bar. Most workshop compressors are rated for 8–10 bar. Neither is enough for fiber laser air cutting.
Enough for pneumatic tools and cylinders. Not enough to clear the kerf cleanly on a laser cutter or protect the optics at cutting speeds.
Adequate for thin material at low power. At 6KW and above, insufficient pressure causes dross buildup, oxidation on cut edges, and reduced lens life.
The working pressure used in all configurations in this guide. Provides the gas velocity needed to clear the kerf at all material thicknesses and all power levels up to 80KW.
All compressor systems in this guide are rated at 16 bar continuous working pressure. The flow rate (m³/min) — not the pressure — is what scales up as laser power increases. Pressure stays at 16 bar throughout; flow rate grows from 1.3 m³/min at 4KW to 10.2 m³/min at 80KW.
What's Inside a Laser-Grade Compressed Air System
A full laser cutting air system is not just a compressor — it is a chain of components that each do a different job. Understanding what each one does helps you know what you are buying and why you cannot skip any of them.
Screw air compressor
The heart of the system. A rotary screw type — not a piston type — is used because it delivers continuous high-pressure air without the pulsing that piston compressors produce. The motor size (15KW, 22KW, 37KW, etc.) determines how much air it can produce per minute.
Air receiver tank
A storage vessel that buffers the air supply. When the laser briefly demands more air than the compressor can instantly produce (during a burst cut), the tank supplies the extra volume. Bigger tanks mean more stable pressure during heavy cutting cycles. Size ranges from 350L to 2,000L in this guide.
Refrigerated air dryer
Cools the compressed air to 2–10°C, which causes moisture to condense and drain out. Every compressed air system in this guide includes one. It handles the bulk of moisture removal and is sufficient on its own for laser systems up to 8KW.
Desiccant dryer — 10KW+ only
Passes the air through a desiccant material (activated alumina) that absorbs moisture down to a dew point of -20 to -40°C — much drier than the refrigerated dryer alone can achieve. Required at 10KW and above, where higher air volumes and more sensitive optics demand drier air. Not present in systems for ≤8KW lasers.
Multi-stage precision filters
A series of filter elements — 5, 6, 7, or 9 stages depending on power level — that remove residual particles, oil aerosols, and vapors from the air. The filter chain is what achieves the ≤0.01μm particle and ≤0.003 PPM oil standard required at the cutting head. More stages are used at higher power levels because more air volume means more potential contamination.
Auto drain valves
Small automatic valves at the low points of the system that regularly discharge condensed water. Without them, water accumulates in the tank and piping, eventually bypassing the dryer and reaching the filters. They are included in every system in this guide and require no attention beyond periodic inspection.
Three System Tiers — Which One You Need
As laser power increases, the air system does not just get bigger — it changes in type. There are three meaningful tiers, and the jump from one to the next involves real changes in what equipment you need, not just larger numbers.
All-in-one integrated unit
- Format: Compressor, tank, refrigerated dryer and filters in one frame
- Footprint: Single unit, approx. 1.9×0.8×1.9m
- Weight: 500–650 kg
- Motor: 15KW or 22KW
- Dryer type: Refrigerated dryer only
- Filter stages: 5 or 6
- Installation: Plug in, connect to laser gas line — ready
Skid-mounted system with desiccant dryer
- Format: Separate compressor unit + skid-mounted rear section (dryers, filters, tank)
- Footprint: Two sections, more floor space required
- Weight: 750–1,050 kg
- Motor: 22KW
- Dryer type: Refrigerated + desiccant dryer ← new requirement
- Filter stages: 7
- Key change vs Tier 1: Desiccant dryer added for -20 to -40°C dew point
Large industrial split system
- Format: Standalone compressor + separate skid or split components
- Footprint: Significant floor area, often 4×2m or larger
- Weight: 1,200–2,200 kg
- Motor: 37KW–90KW
- Dryer type: Both refrigerated and desiccant
- Filter stages: 9
- Tank: Two tanks in parallel (1,200–2,000L total)
PM VFD vs Fixed Speed — Which to Choose
For each power tier, the selection table offers both a PM VFD (permanent magnet variable frequency drive) model and a fixed-speed model. The difference matters more than it might seem.
PM VFD (variable speed)
- How it works: The motor speeds up and slows down to match actual air demand
- Laser cutting fit: Excellent — laser machines use air in bursts (cutting, then pausing to pierce or load). VFD matches this pattern.
- Energy use: Significantly lower — compressor runs slow during idle, fast during cutting
- Noise: Quieter, especially during pauses
- Upfront cost: Higher than fixed speed
- Payback: Typically 12–24 months in energy savings at normal production volumes
- Recommended for: Most laser cutting shops running 4+ hours per day
Fixed speed
- How it works: Motor runs at full speed continuously, regardless of demand
- Laser cutting fit: Adequate — but wastes energy when the laser is not actively cutting
- Energy use: Higher — full-speed operation even during idle periods
- Noise: Louder, constant
- Upfront cost: Lower than PM VFD
- Payback: Lower upfront, but higher operating cost over time
- Recommended for: Very low usage (less than 2 hours per day) or tight initial budget
Complete Selection Table
The table below shows the recommended air compressor configuration for each laser power level. All systems run at 16 bar. Flow rate, tank size, and filter stages scale with laser power.
↔ Swipe to view full table
| Laser power | Air flow (m³/min) | Tank volume | Filter stages | Desiccant dryer | Compressor motor | PM VFD model | Fixed speed model |
|---|---|---|---|---|---|---|---|
| Tier 1 — All-in-one integrated unit | |||||||
| ≤4KW | 1.3 | 350L | 5-stage | No | 15KW | CPMZY15 | — |
| ≤6KW | 1.5 | 500L | 5-stage | No | 15KW | DMZY20 | DBZY20 |
| 6–8KW | 2.0–2.41 | 400–500L | 5–6 stage | No | 22KW | CPMZY22 / DMZY30A | DCZY30A |
| Tier 2 — Skid-mounted system + desiccant dryer | |||||||
| 10–15KW | 2.41 | 600L | 7-stage | Yes — -20 to -40°C | 22KW | CPM30AAS / DM30AAS | DC30AAS |
| Tier 3 — Large industrial split system | |||||||
| 20–30KW | 3.9 | 1,200L (2×600L) | 9-stage | Yes — -20 to -40°C | 37KW | CPM50AAS / DM50AAS | — |
| 40KW | 6.2 | 2,000L (2×1,000L) | 9-stage | Yes — -20 to -40°C | 55KW | DM75AAS | — |
| 60KW | 9.0 | 2,000L (2×1,000L) | 9-stage | Yes — -20 to -40°C | 75KW | DM100AAS | — |
| 80KW | 10.2 | 2,000L (2×1,000L) | 9-stage | Yes — -20 to -40°C | 90KW | DM125AAS | — |
All systems: working pressure 16 bar, particle ≤0.01 μm, oil content ≤0.003 PPM. "—" in fixed speed column means only VFD model is available at that power level. Contact GWEIKE to confirm current model availability and pricing.
Electrical Requirements — Plan This Before the Machines Arrive
This is the section most buyers overlook until it is too late. The air compressor needs its own dedicated electrical circuit — it cannot share a supply with the laser machine. At higher power levels, the cable and breaker requirements are substantial. Getting an electrician in to run this wiring after the machines are already on site adds weeks to your installation timeline.
↔ Swipe to view full table
| Laser power | Compressor motor | Supply cable (compressor) | Supply cable (dryer) | Circuit breaker | Notes |
|---|---|---|---|---|---|
| ≤4KW | 15KW | 10 mm² | 2.5 mm² | 60A | Standard installation |
| ≤6KW | 15KW | 10 mm² | 2.5 mm² | 60A | Standard installation |
| 6–8KW | 22KW | 16 mm² | 2.5 mm² | 80A | Heavier cable than ≤6KW |
| 10–15KW | 22KW | 16 mm² | 2.5 mm² | 80A | Separate circuit for desiccant dryer |
| 20–30KW | 37KW | 25 mm² | 2.5 mm² | 120A | Consult electrician for cable run length |
| 40KW | 55KW | 50 mm² | 2.5 mm² | 160A | Large cable — plan conduit route in advance |
| 60KW | 75KW | 70 mm² | 2.5 mm² | 250A | May require panel upgrade — check with utility |
| 80KW | 90KW | 95 mm² | 2.5 mm² | 250A | May require panel upgrade — check with utility |
Cable cross-section values are for the compressor motor supply only. The refrigerated dryer (cold dryer) always uses 2.5mm² regardless of laser power. Actual cable sizing may need to be increased for long runs — consult a licensed electrician using your local wiring regulations and the cable run distance.
Maintenance Schedule
A screw air compressor for laser cutting is a production machine. It runs for hours every day and its condition directly affects your cut quality. Following the service schedule below keeps the system reliable and prevents the most common cause of early lens damage — contaminated air from a poorly maintained compressor.
First service
500 hours or 3 months (whichever comes first)- Air filter element
- Oil filter
- Lubricating oil (full change)
New machines accumulate more debris in the first few hundred hours. The first service clears this and establishes a clean baseline.
Regular service
2,500 hours or 6 months (whichever comes first)- Air filter element
- Oil filter
- Oil separator core
- Lubricating oil (full change)
Annual service
5,000 hours or 12 months (whichever comes first)- Air filter element
- Oil filter
- Oil separator core
- Lubricating oil (full change)
- All precision filter elements
- Desiccant adsorbent (if fitted)
- Drive belts (belt-drive models)
Not sure which system fits your setup?
Tell us your laser machine's power level, your facility's current electrical capacity, and your daily production hours. We can confirm the right compressor system and check whether any electrical upgrades are needed before your machine arrives.
Helpful to include: laser machine model and power (KW), factory voltage (single or three phase, 220V/380V/440V), approximate distance from main panel to machine area, and whether compressed air is currently available on site.
FAQ
Can I use my existing factory air supply (6–8 bar) for laser cutting?
No. Laser cutting with air assist requires 16 bar at the cutting head. Most factory pneumatic lines run at 6–8 bar, which is not enough to clear the kerf cleanly or protect the optics at cutting speeds. You need a dedicated high-pressure screw compressor system rated for 16 bar continuous output.
Why does a 10KW laser need a desiccant dryer when a 8KW doesn't?
A standard refrigerated dryer reduces moisture to a dew point of 2–10°C, which is adequate for lower-power cutting. At 10KW and above, the air volume is much higher and the cutting optics are more sensitive to moisture. A desiccant dryer reduces the dew point to -20 to -40°C — much drier. This prevents oxidation spots on cut edges, protects the lens from moisture fogging, and keeps the multi-stage filter system working properly. The cost and footprint of adding a desiccant dryer is one reason the jump from 8KW to 10KW involves a bigger system upgrade than just increasing laser power.
What is the difference between a PM VFD compressor and a fixed-speed compressor?
A PM VFD (permanent magnet variable frequency drive) compressor adjusts its motor speed to match actual air demand. A laser cutting machine uses air in bursts — cutting one moment, pausing to pierce or load the next. A fixed-speed compressor runs at full speed continuously regardless of demand, wasting energy during idle periods. For production facilities running the laser several hours a day, the PM VFD typically pays back the price premium within 12–24 months through energy savings. Fixed speed is suitable for very light use or where initial budget is the priority.
Does the air compressor need its own electrical circuit?
Yes. The compressor motor draws significant current — from 60A for a 15KW unit up to 250A for a 90KW unit. Running it on the same circuit as the laser machine causes voltage drops and tripped breakers. The compressor always needs a dedicated circuit with the correct cable and breaker rating. See the electrical specifications table in Section 7. Plan this wiring before the machines arrive — it is one of the most common causes of installation delays.
How often does the air compressor need servicing?
First service at 500 hours or 3 months. Regular service at 2,500 hours or 6 months. Full annual service at 5,000 hours or 12 months. Each service interval involves different component replacements — see the maintenance schedule in Section 8. Always use manufacturer-specified replacement parts, as the wrong filter elements can allow contaminated air to reach the laser optics.
