Nitrogen vs Oxygen vs Air: Laser Cutting Assist Gas Guide
Assist gas is the biggest operating cost on most fiber lasers after electricity, and the least examined. Shops inherit a gas habit with the machine, run it for years, and never do the math on whether nitrogen's premium edge, oxygen's speed, or air's near-zero cost actually fits the parts going out the door. This guide is the decision framework: what each gas does, an edge-quality comparison across mild steel, stainless, and aluminum, the cost-per-part math, and the pressure numbers by thickness.



















