Fibre laser and CNC plasma both cut sheet metal for UK fabrication shops — but they are not the same process, and they do not produce the same edge, nest density or finish cost. Plasma remains a practical route for thick mild steel and rough prep. Fibre laser has become the default when stainless, aluminium, tighter tolerances and cleaner edges drive your quoting. This guide helps UK buyers decide which route fits everyday work — and when a shop still needs both.
Plasma still earns its keep on thick mild steel plate — fibre wins when stainless, aluminium and clean sheet edges drive your quotes. Compare Vector and Titan on the fibre laser hub, match kW on the power guide, and model ownership on the fibre ROI calculator before you retire or keep your plasma cell.
Ready to shortlist fibre after plasma? Browse fibre laser cutters, compare mid-format options such as the Vector FL90 or production flatbeds like the Titan N3015, then model payback with the fibre laser ROI calculator.
The short answer: start with thickness, material and finish
- Everyday thin-to-mid sheet — mild steel, stainless and aluminium with clean edges and accurate nests — usually points toward fibre laser.
- Thick plate, structural sections and rough blanks where kerf and heat-affected zone are acceptable often still suit CNC plasma.
- If you cut both thin precision sheet and heavy plate, many workshops run plasma and fibre as complementary cells — not one machine for every job.
- CO₂ laser and CNC routing answer different materials entirely — use the sibling comparison guides when acrylic, timber or routed board dominate.
Explore fibre platforms on the fibre laser hub. For plasma table context see CNC plasma cutting tables. If the question is fibre vs CO₂ rather than plasma, read fibre laser vs CO₂ laser instead.
How the two processes differ
CNC plasma cutting uses an electrically conductive gas jet — plasma — to melt and blow metal from the cut path. It is robust, relatively forgiving on thicker mild steel, and familiar on many UK fab floors. The trade-offs are a wider kerf, more heat-affected material, and edges that often need secondary finishing for visible or fitted parts.
Fibre laser cutting delivers a solid-state laser beam through a fibre optic to a focused cut head. Assist gas — typically nitrogen or oxygen depending on the job — ejects molten metal and shapes the edge. The result on suitable sheet is a narrower kerf, tighter nests, and edges that more often go straight to bending or welding with less grind time.
Fibre laser vs plasma — comparison at a glance
| Factor | Fibre laser | CNC plasma |
|---|---|---|
| Best everyday materials | Mild steel, stainless, aluminium sheet | Mild steel plate; stainless possible with limits |
| Edge quality | Cleaner, narrower kerf on suitable sheet | Wider kerf; more dross / HAZ on many jobs |
| Thin sheet & fine detail | Strong — nests and small features | Weaker — kerf and heat limit fine work |
| Thick plate | Power- and process-dependent; not always the cheapest route | Often stronger value on heavy mild steel |
| Nest density | High — less scrap on flat sheet programmes | Lower — larger kerf and pierce allowance |
| Secondary finishing | Often reduced for fitted / visible parts | Frequently needed before paint or tight fits |
| Running profile | Electricity, assist gas, optics, extraction | Consumables (tips, electrodes), power, extraction |
| Typical buyer trigger | Quality, stainless/aluminium, throughput on sheet | Capital, thick plate, rough structural prep |
When plasma still wins
Plasma is not obsolete. It remains a sensible primary process when:
- Your mix is dominated by thick mild steel plate where fibre power and gas cost do not pay back cleanly.
- Parts are structural blanks, brackets and frames where edge appearance is secondary.
- Capital budget and floor-space planning favour a robust plasma table first.
- You already have plasma capacity and only need fibre for a minority of stainless or precision sheet work — subcontract or a later fibre cell may be better than forcing one process.
Mantech has supplied CNC plasma tables into UK workshops — read the overview on CNC plasma cutting tables and browse live installs under plasma cutter installs on installations.
When fibre laser wins
Fibre becomes the stronger default when your quoting depends on:
- Stainless and aluminium sheet with consistent edge quality.
- Tighter dimensional control and denser nests on flat sheet.
- Less grind and dress time before bending, welding or powder coat.
- Repeat production programmes where pierce quality and cut speed on mid-thickness sheet compound across shifts.
- Bringing subcontract laser work in-house with a finish customers will accept without rework.
Match kW to everyday thickness with the fibre laser power guide, then shortlist Vector and Titan platforms on the fibre laser hub. Common UK mid-format shortlists include Vector FL90 and Vector FL130; production 3015-format work often starts at Titan N3015.
Vector vs Titan once you choose fibre
Choosing fibre is only the first decision. Bed size and power tier decide which Mantech family fits:
- Vector FL60 / FL90 / FL130 — compact and mid-format enclosed fibre for workshops stepping up from plasma or bureau cutting without a full 3015 footprint.
- Vector FL250 / FL300 — larger Vector beds for higher-duty sheet production.
- Titan N3015 and sibling flatbeds — 3000 × 1500 mm industrial format with higher power tiers for production fabricators.
Process and materials context lives in the fibre laser cutting guide. Budget and payback context: fibre laser cost guide and the fibre laser ROI calculator.
Safety, extraction and install planning
Both processes need extraction and operator discipline. Fibre laser cells add enclosure, interlock and optics care expectations that differ from an open plasma bay. Plan fume control, power supply and training before the machine arrives — not after the first shift.
Read fibre laser safety and size extraction on the Kemper fibre laser extraction hub. Sector examples: applications.
Buying checklist before you quote
- List your top five jobs by material, thickness and edge finish — not brochure peak thickness.
- Estimate how much of your mix is stainless / aluminium vs thick mild steel plate.
- Decide whether plasma stays for heavy plate while fibre takes sheet — dual-process shops are common.
- Confirm bed size against your largest everyday nest, not one-off oversized jobs.
- Budget assist gas, extraction, training and service — not only the machine invoice.
- Bring sample DXF files and scrap samples to a demo so edge quality is judged on your work.
Explore Mantech fibre laser cutters
Mantech Machinery UK supplies Vector and Titan fibre laser cutters from Halesowen with UK installation, training and engineering support. If you are moving off plasma for sheet quality — or adding a fibre cell alongside plasma — our engineers can map bed size, kW and extraction to your mix.
Browse the fibre laser cutters hub, call 0121 541 1444, or request a quote from any product page. See UK installs on installations.
Useful next reads
- Fibre laser cutting guide
How fibre cutting works, materials and power/bed choices.
- Fibre laser power guide
Match 3–20 kW tiers to everyday thickness once you choose fibre.
- Fibre laser vs CO₂ laser
Different comparison — metal vs non-metal laser routes.
- CNC router vs fibre laser
When routing board and cutting metal are both in the quote mix.
- CNC plasma cutting tables
Plasma-side context if thick plate remains your primary process.
- Fibre laser cost guide (UK)
Ownership context before you model payback.
Frequently asked questions
Is fibre laser better than plasma for sheet metal?
For everyday thin-to-mid sheet — especially stainless and aluminium with clean edges — fibre laser is usually the stronger fit. Plasma often remains better value on thick mild steel plate and rough structural blanks. Better means matched to your mix, not a universal winner.
Can a fibre laser replace my plasma table completely?
Sometimes — if almost all work is suitable sheet thicknesses and you no longer need heavy plate capacity. Many UK shops keep plasma for thick plate and add fibre for precision sheet. List thicknesses and finish requirements before you retire plasma.
What about stainless steel — fibre or plasma?
Fibre laser is typically preferred for stainless sheet where edge quality and heat input matter. Plasma can cut stainless but edge finish and secondary work often lag fibre on production sheet jobs. Confirm thickness and finish on a demo nest.
Does fibre laser cost more to run than plasma?
Running profiles differ: fibre leans on electricity, assist gas and optics care; plasma leans on consumable tips and electrodes plus power. Total cost depends on material mix, gas choice and shift length — use the fibre cost guide and ROI calculator for ownership context, not brochure claims alone.
Which Mantech fibre laser suits a shop moving up from plasma?
Compact and mid-format Vector FL90 or FL130 suit many workshops leaving plasma for cleaner sheet work without a full 3015 footprint. Higher-duty 3015 production often starts on Titan N3015 or larger Vector beds. Match bed and kW to everyday nests via the power guide and fibre hub.
