Oxygen Cutting

Oxygen cutting (also called oxygen-assist cutting) is the preferred approach for carbon and mild steel because oxygen reacts exothermically with the molten material at the cut zone, releasing additional energy that accelerates the cutting process and delivers excellent edge quality. This technique is economical for ferrous materials because oxygen is inexpensive and readily available.

Oxygen-assist laser cutting produces a slightly oxidized cut edge (a thin black oxide layer), which is cosmetically visible but structurally benign on unfinished parts. However, oxygen must never be used on stainless steel, aluminum, or copper alloys because the oxidation layer compromises material properties: on stainless, it destroys corrosion resistance, and on non-ferrous materials, it creates a brittle, mechanically weak surface that fails under stress.

Understanding when oxygen cutting is appropriate and when nitrogen cutting is required is essential for material-specific quality and cost optimization.