What Materials Can A Fiber Laser Machine Cut?

A fiber laser machine is built to cut metal, and it does that job better than almost anything else. It slices through mild steel, stainless steel, aluminium and more with clean edges and very little waste. The cut is non-contact too, so there’s no tool wear and very little distortion. Fabricators choose it for speed, tight tolerances and low running costs. A single machine can cut both flat sheet and pipe, which keeps more of the work in-house.

Here’s what a fiber laser cutting machine handles well and what it does not.

What metals can a fiber laser cut best?

Fiber lasers produce a beam at a wavelength that metal absorbs easily. That absorption is why they cut metal so cleanly and so fast. The result is a tight, accurate cut that holds its shape, even on detailed parts. The metals below are the everyday workhorses.

Ferrous metals

These iron-based metals are the bread and butter of fiber laser work, and they cut fast and clean:

• Mild steel — One of the most common materials on any shop floor. It absorbs laser energy well, so you get fast cuts across a wide thickness range.
• Stainless steel — Cuts with sharp, clean edges and needs little finishing. A favourite for food, medical and architectural work.
• Carbon steel — Handles thicker plate with ease when you pair it with the right assist gas.
• Galvanised steel — Cuts much like mild steel, though the zinc coating means you want good fume extraction.

Non-ferrous metals

These metals are more reflective, so they ask a bit more of the machine, but the right setup handles them all:

• Aluminium — Reflective and quick to melt, so it needs more power and the right settings. Done well, the edge is smooth and burr-free.
• Copper and brass — Both are highly reflective. A modern fiber laser machine manages them safely with enough power and a back-reflection system.
• Titanium — Cuts cleanly without burning, which makes it popular for aerospace and medical parts.
• Nickel alloys — Strong and corrosion-resistant, they cut cleanly and hold their properties, which suits energy and aerospace work.

How power and thickness change the picture

The thickness you can cut comes down to the power of the machine. More kilowatts means thicker material and faster speeds. Here’s a rough guide for mild steel:

These figures are a starting point. Cut quality, assist gas and material grade all shift the result. Nitrogen gives a clean edge, oxygen helps on thicker steel and air keeps running costs down. A thicker plate also cuts more slowly, and research on structural steel shows cut quality drops as the material gets thicker. So speed and thickness always trade off against each other. It pays to confirm the numbers for your exact job.

What can’t a fiber laser cut?

A fiber laser cutting machine is made for metal, so some materials are off the table. These materials don’t absorb the beam the way metal does, so the cut is poor or unsafe. The beam passes through or burns them instead. Avoid these:

• Glass and clear acrylic
• Wood, paper and cardboard
• Stone, ceramics and marble
• Most plastics, which can give off toxic fumes

For those jobs, a CO2 laser or waterjet is the better fit.

Find the right fiber laser cutting machine at MACRO Supply

The metal you cut, its thickness and your production volume all point to a certain power range. That is why picking the right fiber laser machine matters from day one. You can browse the full sheet cutting fiber laser range to see the options, or talk to our team at MACRO about the materials you work with. Every machine ships with lifetime service and technical support behind it. We will help you match the machine to the job, so you invest once and cut with confidence for years.