Arc
A pilot arc ionises the gas at the torch.
Manufacturing services · Chapter D · Method 22
Plasma cutting
An electrically ionised gas arc melts and blows through conductive metal. Quick and economical for thicker steel plate.
How it works
Plasma cutting, step by step.
A labelled schematic of the process (not to scale), and the four steps every job goes through.
Transfer
The arc transfers to the earthed plate.
Cut
High-velocity plasma removes molten metal.
Clean
Remove dross and grind edges if needed.
Reference figures
What to expect.
Typical industry values to help you plan. We agree the figures for your part on the drawing.
ToleranceCoarser than laserAgreed per job
ThicknessMedium – heavy plateSteel and aluminium
SpeedHighOn thick plate
EdgeSlight bevelSome dross
| Materials | Mild steel, stainless and aluminium plate; other conductive metals. |
|---|---|
| Finishes | As cut with slight bevel and heat-affected zone; ground or machined edges as required. |
| Design guidance |
|
| Best suited to | Base plates, structural brackets and heavy frames. |
| Watch-outs | Wider kerf, heat-affected edge and lower accuracy than laser. |
More in chapter D
Other methods in Sheet & tube
- 19 · Sheet metal fabrication
- 20 · Laser cutting
- 21 · Waterjet cutting
- 23 · Sheet metal bending
- 24 · Punching
- 25 · Laser tube cutting
- 26 · Tube bending
Next step
Not sure this is the right route?
Send a sketch, photo, sample or CAD file with your quantity and target date. We will recommend the most sensible route and explain the trade-offs before quoting.
Reference figures are typical published industry values for planning, not a guarantee; final tolerances, materials and finishes are agreed in writing for each project.