How nitrogen prevents weld oxidation, improves bead quality, and reduces rejection rates across stainless steel, aluminum, and titanium.
In laser and TIG welding, nitrogen serves as a shield gas — a protective atmosphere that surrounds the weld pool and prevents atmospheric oxygen from reacting with the molten metal. Without adequate shielding, welds develop surface oxidation (discoloration), porosity (internal bubbles), and embrittlement (loss of ductility).
On-site PSA nitrogen generation replaces bottled gas cylinders — providing a continuous, consistent supply at 50-70% lower cost per cubic meter. A typical laser welding station consumes 8-15 Nm3/h of nitrogen during operation.
| Material | Mild Steel | Stainless 304/316 | Aluminum | Titanium |
|---|---|---|---|---|
| Min Purity | 99.5% | 99.9% | 99.99% | 99.999% |
| Flow/Welder | 8-12 Nm3/h | 10-15 Nm3/h | 12-18 Nm3/h | 15-20 Nm3/h |
| Pressure | 0.3-0.6 MPa at nozzle | |||
Stainless steel is the most common material in industrial laser welding. At 99.9% purity, standard PSA nitrogen produces clean, bright welds. For titanium aerospace components, 99.999%+ is required — which typically needs downstream gas purification.
Tip: Using excessively high purity for mild steel is wasteful. 99.5% is sufficient and costs significantly less.
Cost: On-site N2 costs $0.15-0.25/Nm3 vs $0.50+/Nm3 bottled. A 5-station shop saves $42,300+/year.
Consistency: PSA maintains +-0.1% purity 24/7. Bottled gas varies between suppliers and batches — a leading cause of intermittent weld defects.
Uptime: Zero production stops from bottle changes. Each bottle changeover wastes 10-15 minutes of production time across all connected stations.