Fiber laser cutting machines

A fiber laser cutting machine is a CNC cutter that melts metal with a focused infrared laser beam and blows it out of the cut with an assist gas. It suits job shops and manufacturers cutting mild steel, stainless and aluminium from thin sheet to thick plate, where tight tolerances, fine detail and fast changeovers matter.

How fiber laser cutting works

The beam is generated in a solid-state fibre source and carried through a flexible fibre cable to the cutting head, where lenses focus it to a small spot at or just inside the sheet surface. The metal melts in that spot and a jet of assist gas from the nozzle clears it out of the kerf. A CNC moves the head over the sheet on a gantry while a height sensor keeps the nozzle at a constant distance from the surface.

The assist gas changes the process. Oxygen reacts with mild steel and adds heat, which is why it is still used for thick plate. Nitrogen and clean compressed air only push the melt out, leaving an edge with little or no oxide. Reflective metals such as copper and brass can be cut on machines designed for them; Trumpf, for example, says its TruLaser 1030 fiber cuts copper with nitrogen.

Main machine types

Open bed, single table

The simplest layout is a gantry over one cutting table with no full cabin around the work. It takes the least floor space and is the easiest to install, but the operator loads and unloads the same table the machine cuts on, so the laser waits during handling. The Senfeng SF3015NP is a typical example for 10 x 5 ft sheet, offered from 3 to 12 kW. Because the cutting zone is open, the shop has to control the area around it; our open versus enclosed comparison covers the trade-offs.

Enclosed, with exchange table

A full cabin with interlocked doors and laser-rated windows contains the beam, spatter and much of the fume, and two shuttle tables let one sheet load while the other cuts. This is the usual production layout from 3 x 1.5 m upward. The Trumpf TruLaser 1030 fiber is the entry model in Trumpf's flatbed range, with 4 to 12 kW TruFiber sources.

Compact, large-format and combination machines

At the small end, a machine such as the Gweike LF1390 cuts small, precise parts on a fully enclosed 1300 x 900 mm table with 500 W to 3 kW. At the large end, open plate cutters run beds over 13 m long. Some sheet lasers also process tube: the Amada ENSIS-3015RIe adds a rotary index for round, square and rectangular tube, channel and angle on a 3 x 1.5 m machine.

How to choose: the specs that matter

• Format. Match the bed to the sheet you buy and the longest part you cut. A bigger bed means more floor, more extraction and a heavier exchange table.
• Laser power. Extra kilowatts mainly buy speed on thin sheet and capacity on thick plate. Size the source to the thickness you cut every week, not the yearly exception; our fiber laser power guide gives typical thickness ranges by kilowatt.
• Cutting head and automation. Look for automatic focus, nozzle centring and an automatic nozzle changer. Bystronic's changer swaps nozzles in about 15 seconds according to the cutting plan, which matters when jobs change several times a shift.
• Table load and exchange time. Check the maximum sheet weight per table for your thickest plate and how long a pallet change takes.
• Accuracy. Makers quote positioning accuracy on different bases (per metre, over the whole axis or as repeatability), so compare like with like and ask for test parts in your material.
• Software and control. Nesting, remnant handling and licence terms affect daily output as much as the source does.

Assist gas and compressed air

Gas is a planning decision, not an accessory. Oxygen runs at low pressure and low flow for mild steel. Nitrogen gives bright edges on stainless and aluminium but needs high pressure and far more volume, supplied from cylinders, liquid bulk or an on-site generator. Compressed air is the cheapest gas to run: Bystronic states that its ByStar Fiber cuts 3 to 30 mm with compressed air. That air must come from a dedicated high-pressure compressor with drying and filtration, not ordinary shop air. Some makers mix gases or reshape the nozzle to save gas; Trumpf offers an integrated nitrogen and oxygen mixer and says its Highspeed nozzle design reduces nitrogen use by an average of 60 percent. Our assist gas guide compares the supply options.

What your plant needs

• Power. Many machines are built for 380 or 400 V, while Canadian plants commonly distribute 600 V three-phase. Some makers offer North American builds: Senfeng lists 380 V as standard and 208, 240, 480 or 600 V three-phase at 60 Hz as available. Otherwise plan a transformer, and count the chiller, compressor and extraction in the load. See 600 V power for imported machines.
• Electrical approval. Electrical equipment must be certified or field evaluated before it is used in Canada. An imported laser without a recognized mark is normally inspected on site under CSA SPE-1000, which is worth scheduling before commissioning.
• Floor and access. A level slab that carries the machine and loaded tables, plus room for the exchange table, sheet storage and a forklift or crane path.
• Fume extraction. Cutting releases metal fume and fine dust. CCOHS notes that stainless fume can contain hexavalent chromium and nickel, and galvanized steel gives off zinc oxide. Production lasers extract from zones under the bed into a filter unit; even open machines such as Senfeng's use negative-pressure dust removal. Our fume extraction and safety guide goes further.
• Laser safety. The multi-kilowatt source inside is a Class 4 laser. CCOHS points to ANSI Z136.1, which recommends a laser safety program for Class 3B and 4 workplaces: a laser safety officer, warning signs, training and regular inspection. A full enclosure with interlocks contains the beam in normal operation; an open bed relies on area controls. Confirm the laser classification of the delivered machine in the quote.

Running costs and consumables

Cost per part varies from shop to shop, but the drivers are consistent:

• Assist gas, usually the largest variable cost when cutting stainless or aluminium with nitrogen.
• Electricity for the source, chiller, extraction fans and, if you cut with air, the compressor.
• Head consumables: nozzles and the protective window that shields the focusing optics from spatter. Trumpf monitors the protective glass with a sensor so it is changed only when needed, and Bystronic builds a quick-change system for it.
• Bed slats, which erode with use and are replaced in sets.
• Filters in the extraction unit and the chiller, and chiller coolant.
• Service and software: preventive maintenance, source and head repairs, and any annual software licences.

Typical applications

Fiber lasers cut brackets, enclosures, panels and chassis parts for general sheet metal work; stainless parts for food service and kitchen equipment; aluminium and steel components for HVAC, signs, trailers and farm equipment; and thick plate for structural and heavy equipment builders. Where most parts are thick mild steel with looser tolerances, compare the laser against a plasma table before deciding, and where most parts are tube, look at a dedicated tube laser.