| 摘要 |
<p>A method of laser drilling a gas turbine engine nozzle guide vane segment made up of two or more adjacent aerofoil sections spaced apart so that between each pair of aerofoil sections there are entry, throat and exit sections. The laser beam is directed at the surface of the aerofoil section to be drilled through either an entry or an exit section and a jet of assist gas is directed at the point of incidence of the laser beam through the other of the entry or exit sections.</p> |
