Frequently asked questions

Most industrial fiber cutters handle mild steel up to roughly 25–40 mm with oxygen, and stainless or aluminium to a lesser thickness with nitrogen. The more useful question is cost per part rather than maximum thickness: above about 12 kW the cutting economics are decided by assist gas, consumable life and uptime rather than by source power, because melt ejection — not energy input — limits speed in thick section.

It depends entirely on what happens to the cut edge afterwards. Nitrogen gives a bright, oxide-free edge needed for parts that will be welded without preparation, electropolished, or left visible. For parts that will be painted, powder coated or hidden inside an assembly, filtered and dried shop air produces a serviceable edge at the cost of electricity rather than bulk gas — often the single largest saving available in a cutting cell.

No. A handheld welder is a Class 4 laser: the beam and its reflections from shiny workpieces can cause permanent eye injury well beyond the operator. It needs a controlled area with laser-rated barriers, interlocks, appropriate eyewear for everyone inside and, in most jurisdictions, a designated laser safety officer. Budget the enclosure, extraction and training at a level comparable to the welder itself — it is a cell, not a hand tool.

There are three distinct causes and they respond to opposite fixes. Keyhole instability produces larger irregular pores near the root and is cured by stabilising the process — sometimes by reducing power. Dissolved hydrogen produces fine spherical pores and is cured by cleaning and drying the material, not by changing parameters. Vaporised coating or oil produces porosity with heavy spatter and is cured by joint design or by removing the contaminant. Take a section early: pore shape and distribution tell you which one you have.

Usually UV at 355 nm, but the decision was made before the part reached you. Polymers mark because of laser-markable additives blended in at compounding, not because of the polymer itself. A resin specified without such an additive may be physically impossible to mark to the required contrast regardless of equipment. Write markability into the material specification and test it during resin qualification.

Ratings of around 100,000 hours assume the pump diodes are held at their design temperature, and that assumption is where most sources fall short. Diode life roughly halves for every ten-degree rise in junction temperature, which makes chiller maintenance — coil cleaning, coolant chemistry, flow and filters — the highest-leverage preventive work on the machine. A neglected chiller shows no symptom for years and then presents as a source that can no longer reach rated power.

Only where the thermal damage from the cheaper process creates a downstream cost. Ultrafast wins when it removes an operation (recast removal, deburring), removes a scrap rate on parts that already carry accumulated value, reduces a qualification burden, or makes a feature possible at all. Compared purely on machine hourly rate it loses almost every time — which is why that comparison sends people to the wrong answer.

Rarely the machine time. Manufacturers running production consistently report post-processing — and specifically support removal and the finishing of the surfaces underneath — as the largest single contributor. That cost is set at design: build orientation, self-supporting geometry and putting supports where a tool can reach them decide it, and those are decisions made long before the build starts.

It describes accessible emission, not how dangerous the beam is. An industrial cutting machine contains a Class 4 source and ships as a Class 1 product because its enclosure prevents access — both statements are true at once. That means modification changes the classification: cutting a conveyor opening, adding a camera port, bypassing an interlock or fitting a viewing window rated for the wrong wavelength can all move a machine out of Class 1, which brings the full operational burden of a Class 4 installation.

Carefully, because the headline number averages segments that behave in opposite ways. Commodity sources and machines grow in units while prices deflate, so revenue growth badly understates activity. Specialised process equipment holds price because switching costs are high. Service and consumables track the installed base regardless of the capital cycle. Ask whether a forecast reports units or revenue, what price assumption converts between them, and what the same methodology got wrong last time.