| 摘要 |
<p>The invention relates to a process and a device for the laser beam oxycutting of a workpiece with a focussed laser beam and a jet of cutting gas, both of which are guided through a cutting nozzle, a gas shroud additionally flowing around the jet of cutting gas. This shroud is composed either of the burnt products of a fuel gas/air or fuel gas/oxygen mixture or, alternatively, of a gas or gas mixture heated electrically or indirectly by the laser beam or of a cold gas or gas mixture. Suitable fuel gases are hydrogen, propane, methane, acetylene and/or ethylene. As cold gases, use is preferably made of nitrogen, oxygen, compressed air, argon, helium, CO2 and mixtures thereof. High-purity oxygen is preferably used as the cutting gas.</p> |
