| 摘要 |
<p>Workpiece is treated by directing a laser beam onto it, and striking an arc from an electrode the zone heated by the beam. Pref. the heated zone extends through the workpiece and the arc is struck to the surface opposite to the beam; or arcs may be struck to both the beam-incident and opposite surfaces. The incident zone may be moved relative to the workpiece. The workpiece may be surface alloyed by applying a suitable material prior to heating as above with scanning of the whole surface, or the process may be used for cutting drilling or welding with one or more gas jets directed as the heated zone to disperse the generated vapour plume. The gas may be reactive. The use of supplementary arc heating, possibly aided by exothermic reactions involving the gas jet, provides greater thermal energy input to the workpiece than can be achieved by increasing the laser power. Machining is thereby accelerated and weld penetration improved.</p> |
