When
oxygen cutting mild steel, the kerf will be a little wider, so the focus spot is often on or just above the material surface. This focus spot position helps the oxygen do its job of not only evacuating but also burning the material to aid cutting. Typical settings, Hahn said, are about 28 PSI or lower and a flow rate of less than 60 standard cubic feet per hour (SCFH), though some applications may call for pressure as low as 10 PSI. The right oxygen flow and pressure provide just enough oxygen to aid in cutting and evacuating the material. Too much oxygen and the exothermic reaction becomes too wide and produces a rough cut edge.
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