Plasma Cutting
Plasma cutting uses an electrically heated jet of ionised gas to cut conductive metals quickly, especially medium to thick mild steel and stainless plate. It is faster and cheaper than laser on thicker plate, with somewhat lower edge precision.
What it is
An electric arc heats gas into plasma at very high temperature, melting the metal, while the gas flow blows it out of the cut. CNC plasma tables cut plate profiles directly from DXF files.
High-definition plasma gives squarer edges and better holes than conventional plasma, making it a cost-effective choice for structural and fabrication parts.
Typical applications
- Structural plates, gussets and brackets
- Heavy fabrication components
- Base plates and flanges
- Agricultural and construction equipment parts
- Thick stainless and aluminium profiles
Suitable materials
- Mild steel
- Stainless steel
- Aluminium
- Any electrically conductive metal
Points to consider
- Small holes (under about 1.5× thickness) cut poorly by plasma; drill or machine them.
- Edges have a slight bevel and heat-affected zone.
- Use laser for thin, precise parts and plasma for thicker structural parts.
- Budget for edge cleaning where cosmetic or weld-ready edges are needed.
Frequently asked questions
Plasma or laser cutting, which is better?
Laser is more precise and better on thin sheet. Plasma is faster and cheaper on medium to thick plate where very tight tolerances aren't needed.
How thick can plasma cut?
Commonly up to around 40–50 mm in mild steel, depending on the plasma system; oxy-fuel cutting is used for thicker plate.
Does plasma cutting leave a rough edge?
Edges have a slight bevel and may need dross removal. High-definition plasma gives noticeably cleaner edges.