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xTool MetalFab · Gas guide for the operator
Which gas cylinders and valves the xTool MetalFab laser welder and CNC laser cutter actually need – for welding, laser cutting and cleaning metal. Pressures in bar, with the machine's MPa values included.
OXYGEN 0.6 · WELDING 1–2 · CUTTING 6–12
This guide covers the xTool MetalFab 1200 W laser welder and CNC laser cutter, which welds, cuts and cleans metal – stainless steel, carbon steel, aluminium, brass and titanium – with a single fibre-laser system. Below you'll find the exact gases, pressures (in bar), regulators and controls that laser welding and metal laser cutting require.
All at 99.99% purity. The colour runs through the whole guide, so you can see at a glance which cylinder each job needs.
All-round gas. Welding, cleaning and cutting most metals. The most affordable inert-gas option.
Like nitrogen – and the only option for titanium (TC4). Denser shielding for the weld pool.
Only for cutting thick (2–10 mm) carbon steel and galvanised sheet. Needs its own nozzle and a low pressure.
Pressure in bar, the machine's set value (MPa) in small print. Flow in l/min. For thicker cutting, the SaveGas nozzle halves the pressure requirement.
Every cylinder needs a regulator that drops the 200 bar cylinder pressure to the working pressure. For fine adjustment you also add a flow or pressure regulator – always before the laser welder.
Flow (l/min) is easier to control than pressure when welding. The recommended choice for shielding-gas coverage.
15–30 l/minThe standard regulator fitted to the cylinder. Suitable for welding when you set pressure instead of flow.
1–2 bar · 0.1–0.2 MPaFor nitrogen, argon and compressed air. The adjustment range must reach well above the cutting pressures.
range over 12 bar · 1.2 MPaOxygen cutting of thick steel needs a very low and precise pressure. Precision 0.01 MPa.
0.6–0.7 bar · 0.06–0.07 MPaFor installation: an adjustable wrench and thread-seal tape (PTFE). Oxygen is the exception – no ordinary PTFE tape and no oil/grease on oxygen threads.
When cutting 2–10 mm carbon steel or galvanised sheet, you use oxygen and a double-layer nozzle with an extension tube. The pressure is 0.6–0.7 bar – tens of times lower than in other cutting (6–12 bar). An ordinary regulator won't do this.
Plan A: proportional valve set to 0.6–0.7 bar + flow regulator fully open. (E.g. SMC ITV2050-312BL.)
Plan B: a precision pressure valve that adjusts to 0.01 MPa accuracy – no proportional valve needed.
Safety: oxygen accelerates combustion dramatically. No oil, no grease, only oxygen-rated parts. Open the valve slowly.
Connection tip: the welder's gas inlet is a 10 mm push-to-connect fitting. European cylinder valves differ, and each gas has its own standard – confirm the fitting with your gas supplier (in Finland e.g. Woikoski or Linde/AGA).
For laser welding the shielding gas is nitrogen (N?) or argon (Ar), purity 99.99%, flow 15–30 l/min (or pressure 1–2 bar). Argon is mandatory when welding titanium. The same gas also works for manual laser cleaning.
Thin 0.2–1 mm metal cuts at over 6 bar (nitrogen, argon or compressed air). Thicker stainless, aluminium and brass need over 12 bar – or just 6 bar with the SaveGas nozzle. Thick 2–10 mm carbon steel is cut with oxygen at a very low 0.6–0.7 bar.
Yes. Dried compressed air can replace nitrogen or argon as the cutting gas, saving on cylinder costs. It requires a compressor (rated over 10 bar, output over 200 l/min) and an air dryer. See the xTool MetalFab air compressor and dryer unit.
For welding and cleaning a flow regulator (15–30 l/min), for cutting a pressure regulator whose range reaches over 12 bar, and for oxygen cutting of thick carbon steel a proportional or precision pressure valve (accuracy 0.01 MPa) for the low 0.6–0.7 bar. Each cylinder also needs its own regulator.
The xTool MetalFab 1200 W is available in Finland from Nettiverstas with Finnish-language product support. Instalment and leasing are also available for companies. See the xTool MetalFab metal workshop in the online store.
The wire is chosen by material: ER308L for stainless, ER70S-6 for carbon steel and galvanised sheet, and 6061 for aluminium. The wire diameter is matched to the sheet thickness. See all welding wires and accessories.
The xTool MetalFab 1200 W welds, cuts and cleans metal with a single machine – Finnish-language product support, instalment and leasing. For a compressed-air setup, see also the air compressor and dryer.
Source: xTool Support – Preparation Work Before You Use xTool MetalFab (support.xtool.com/article/2105). Pressures converted to bar (1 MPa = 10 bar).
The oxygen and cylinder safety notes and the Finnish supplier information reflect general industry practice – confirm current details with your gas supplier. Electrical and gas installations only by an authorised professional.
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