Aluminium behaves differently from steel in ways that show up immediately on the cut: the surface reflects the beam, the material conducts heat quickly, and the melt oxidises into a hard, spiky dross that is difficult to remove. On LP-F1500 and LP-F3000 machines the answer is a combination of surface preparation, gas choice and nozzle geometry rather than raw power.
Surface condition matters more than most operators expect. Mill finish or anodised sheet with an oxide layer traps gas at the kerf and produces a rough cut, while clean, unwaxed sheet with protective film removed just before loading cuts noticeably better. If the sheet is too large to handle manually, the LP-A series can be fitted with a film removal and surface scrub station so the oxide layer is brushed and blown away immediately ahead of the head.
For gas, nitrogen gives the best edge on 3 mm and 5 mm aluminium but raises cost noticeably on thicker sections. Compressed air at 20 bar is the economical choice for 2 mm and below, and a nitrogen and oxygen mix at 4:1 or 6:1 is a good compromise on 6 mm and 8 mm. Whichever you use, set the pressure at the source and check it weekly, since a drop of 1 bar is enough to start producing dross.
Nozzle geometry is the third lever. A standard single-point nozzle with a 1.5 mm orifice works well on thin sheet, but a 3D or stepped nozzle with a larger orifice and a longer gas shield improves the cut on 6 mm and above by keeping the melt from re-attaching to the wall. Keep the protective window clean — aluminium spatter pits the optic quickly, and a dirty window is the most common reason a good aluminium setup suddenly starts producing spatter.
The last item is housekeeping. Aluminium is very sensitive to cross-contamination, so dedicated nozzles, a dedicated gas line and a dedicated lens set are worth having on any machine running both aluminium and steel. It also settles the argument on the shop floor, because a 6 mm aluminium cut will never look the same as a 6 mm steel cut and the process notes should say so.
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