On-site nitrogen and compressed air in laser cutting
Laser cutting is a precision-driven process where every element matters, from laser power to material quality and, just as importantly, the assist gas.
The right gas supply directly influences cut quality, speed, operating costs, and production reliability.
As manufacturers look for ways to improve efficiency and reduce operating expenses, many are rethinking how assist gases are sourced. Instead of relying on delivered nitrogen, more companies are moving toward on-site nitrogen generation and optimization of compressed air systems.
This is where OMEGA AIR supports the laser cutting industry: by delivering reliable, cost-effective, and scalable gas solutions tailored to production needs.
The role of assist gases in laser cutting
In laser cutting, the laser beam melts or vaporizes material at the cutting point.
The assist gas removes molten material from the kerf, protects the cut edge, and stabilizes the process.
Depending on the application, three gases are commonly used:
• Oxygen, for reactive cutting and higher heat input
• Nitrogen, for oxidation-free, high-quality edges
• Compressed air, as a cost-efficient alternative in suitable applications
Choosing the right gas has a major impact on both performance and cost.
Nitrogen in laser cutting: quality without compromise
Nitrogen is the preferred assist gas when edge quality, appearance, and material integrity are critical. Its inert nature prevents oxidation during cutting, resulting in clean, bright edges without discoloration.
This is especially important for stainless steel, aluminum, and other non-ferrous materials.
High-purity nitrogen also enables:
• Consistent cut quality
• Higher cutting speeds
• Improved process stability
• Reduced post-processing
Laser cutting applications typically require nitrogen purity between 99.9% and 99.999%, depending on machine specifications and material thickness. Producing nitrogen on site allows this purity to be matched precisely to the application, without paying for unnecessary excess purity.
Read more about the purity of nitrogen here.
Why on-site nitrogen generation changes the economics
Traditional nitrogen supply comes with binding contracts and hidden costs: transport, handling, storage, rental fees, and price changes.
On-site nitrogen generation eliminates these factors entirely.
With an OMEGA AIR PSA N-GEN nitrogen generator:
• Nitrogen is produced only when needed
• There is no dependency on external suppliers
• Production continues without delivery delays or downtime
Most importantly, the cost difference is enormous.
For many laser cutting operations, the investment pays off in up to three years, sometimes even sooner.
Beyond cost, on-site generation also reduces CO₂ emissions by removing transport and energy-intensive liquid nitrogen production from the supply chain.
Case study: on-site nitrogen generation vs. bought nitrogen
A laser sheet metal cutting company using nitrogen as an assist gas consumes approximately 100,000 kg of nitrogen per year. Traditionally, nitrogen was supplied through external delivery.
To evaluate long-term efficiency and costs, the production compared this approach with an on-site OMEGA AIR PSA N-GEN 50 nitrogen generator.
Annual nitrogen consumption comparison
With on-site nitrogen generation, the production reduced its annual nitrogen-related costs by 52%, and the return on investment was 3 years. In addition to direct cost savings, the company gained full control over nitrogen supply, eliminated delivery dependencies, and improved overall production reliability.
Compressed air as an efficient assist gas
Compressed air is another viable assist gas option, particularly for applications where surface finish is not critical or where parts will later be painted, welded, or further processed.
Because compressed air contains both oxygen and nitrogen, it combines aspects of reactive and inert cutting.
This allows:
• High cutting speeds
• Very low operating costs
• Immediate availability without supply logistics
Almost every industrial facility already operates a compressed air system.
When properly prepared, with the right filtration, drying, and pressure control, compressed air becomes a stable and economical assist gas for laser cutting.
OMEGA AIR designs complete compressed air treatment systems that ensure consistent quality, protect laser equipment, and maintain reliable cutting performance.
Complete gas solutions for laser cutting applications
OMEGA AIR supplies systems that can be delivered as complete, integrated solutions, including:
• Compressors
• Compressed air filtration and drying
• Oil and water separation
• Activated carbon treatment
• N-GEN nitrogen generators
• Optional nitrogen boosters
Each system is engineered based on actual consumption, required purity, and pressure, ensuring optimal performance without unnecessary energy use or oversizing.
Conclusion
By combining high-quality compressed air systems with on-site nitrogen generation, OMEGA AIR helps laser cutting companies reduce costs, secure supply independence, and improve production sustainability.
The result is a process that delivers consistent quality while significantly lowering operating expenses — especially when compared to purchased nitrogen.
Smarter gas supply is not just an upgrade. It is a strategic advantage.
Inquiry
OMEGA AIR d.o.o. Ljubljana
Cesta Dolomitskega odreda 10
1000 Ljubljana
Slovenia
Cesta Dolomitskega odreda 10
1000 Ljubljana
Slovenia
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