| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent occurrence of burning at an edge portion and its vicinity when cut processing is applied to a workpiece. SOLUTION: A nozzle 2 is mounted on the downward side in a processing head 1. The nozzle 2 comprises an inside nozzle 2A and an outside nozzle 2B. An inner part of the inside nozzle 2A is used as a first supplying passage 4, and a spacing part between the inside nozzle 2A and the outside nozzle 2B is used as a second supplying passage 5. When laser beams are radiated from the processing head 1 to a workpiece 3 for applying cut processing, assist gas is supplied to the workpiece 3 only via the first supplying passage 4 at edge portions of a cutting line and its vicinity. At the processing portion such as a straight line portion except for the edge portions, the assist gas is supplied to the workpiece 3 via the first supplying passage 4 and the second supplying passage 5.</p> |
