For plate up to 1 inch, plasma is the fastest cutting tool in the shop — and the consumables are cheap when you run them right.
Compressed air is forced through a narrow nozzle and energized by an arc inside the torch. The gas turns into plasma — hot enough to melt steel — and blows the molten metal out of the kerf.
Compressed air enters the torch and swirls around the electrode through the swirl ring, which spins the gas into a tight vortex.
The arc ignites between the electrode and the nozzle (pilot arc) — inside the torch, protected from the work.
The nozzle constricts the gas column. Constriction forces the arc into a narrow, intense jet — that squeeze is what makes plasma cut, not just burn.
The jet transfers to the work, melts a narrow slot, and the gas velocity blows the molten metal out the bottom as dross.
Portable for the shop floor, mechanized for the table, high-definition for production quality. The type follows the work envelope.
30–65 A units on 120/240 V. The shop workhorse for repair, demolition, and cutting to size before welding.
The same engine driving a torch on a gantry table — accurate nesting, repeatable cuts, and consumable efficiency the hand can't match.
Fine-cut technology with tighter arc control for near-machine edges — used where edge quality earns a premium.
One plug, one unit — ideal for mobile work where shop air doesn't reach. Capacity is limited by the compressor, not the torch.
Dedicated gouging torches and high-amperage units can remove welds and back-gouge — a full plasma system replaces carbon arc.
CNC tables with a water bed catch fume and dross at the cut. Reduces noise, sparks, and plate warping on thin stock.
Plasma consumables die by starts and pierces, not by the hour. Treat them as a set — they wear together and cut best as a matched stack.
| Consumable | Job | Wear Signs | Typical Life |
|---|---|---|---|
| Electrode | Carries the arc | Pit in the center, eroded tip | 500–1,500 starts |
| Nozzle | Constricts the jet | Oval orifice, burned edges | 300–800 starts |
| Swirl ring | Spins the gas | Chipped or blocked holes | 5–10 electrode sets |
| Shield / retaining cap | Protects the stack | Melted or spatter-bonded | 10+ electrode sets |
A pierce stresses consumables harder than a running cut. Edge starts and drag cuts save the stack.
Water in the air line is the #1 consumable killer — it shortens electrode and nozzle life to minutes. Drain your compressor.
Track total consumable spend against cut time. The difference between a good and bad air setup shows up in this number.
Rated cut is the thickness you can cut cleanly at rated speed. Severance cut is the thickness it will eventually get through — slowly and ugly. Buy for the rated number.
| Machine Class | Rated Cut | Severance | Cut Speed at 1/4" | Input Power |
|---|---|---|---|---|
| 30–40 A portable | 1/4–3/8" | 1/2" | ~50 in/min | 120 V |
| 45–50 A portable | 1/2–5/8" | 3/4" | ~65 in/min | 120/240 V |
| 65 A | 3/4" | 1" | ~85 in/min | 240 V |
| 85–105 A | 1" | 1-1/4" | ~110 in/min | 240 V / 3-phase |
| High-definition CNC | 1–1-1/4" | 1-1/2"+ | Machine-optimized | 3-phase |
Air requirement is part of capacity: a 65 A cutter needs roughly 6–8 SCFM at 90–120 PSI sustained by the compressor. Undersized air cuts slower and eats consumables.
Cut quality is the diagnostic. A bad edge points at one of three things: consumables, air quality, or technique — in that order.
Causes
Speed too slow or fast, worn consumables, low air pressure, arc stretched too far off the plate.
Fix
Match speed to amperage, replace the stack, check pressure at the torch — not at the regulator.
Causes
Moisture or oil in the air, excessive pierces, wrong amperage, touching the work with a live torch.
Fix
Drain and filter the air line, pierce at proper height and angle, run at rated amps.
Causes
Worn nozzle or electrode, loose stack seating, bad ground, moisture shorting the start circuit.
Fix
Replace the stack, reseat the torch head, clean the ground, check air dryness and pressure.
Causes
Air pressure fluctuation, compressor cycling under load, or a swirly ring losing its pattern.
Fix
Steady air supply with a storage tank, check the swirl ring holes, verify pressure holds under flow.
Causes
The start spark disrupts nearby electronics — phones, CNC controllers, and computer monitors.
Fix
Keep leads away from sensitive equipment, use proper grounding, and follow the manual's start-sequence notes.
Causes
Damaged O-rings in the head, crossed threads, or a deformed shield from a crash on the table.
Fix
Replace O-rings, hand-tighten only, and replace any shield that will not align flat against the torch face.
Start with the material and thickness you cut, then the cut quality and duty cycle you need, then the power and air you actually have.
Provide your welding requirements and get an equipment recommendation.
Get Equipment Recommendation