| 摘要 |
The invention relates to a machining head and to a process for the surface machining of workpieces by means of a laser beam, in which coating, alloying in the area close to the surface or dispersion of a peripheral zone of the base material with powder particles can be carried out using a pulverulent filler supplied. The invention is intended to make it possible to maintain, independently of direction, a virtually constant mass flow rate of the powder supplied, the intention being to form a uniform hollow powder jet. According to the invention, this object is achieved by the fact that in a housing of the machining head a turbulence chamber is formed, into which a powder-gas flow is introduced at least via one entry opening and the powder-gas flow is directed through a conical annular gap, as a hollow coaxial jet, as is the laser beam guided through the housing, onto a workpiece surface, and stabilizing passages, which are aligned parallel to the longitudinal axis of the laser beam, are present in a radially symmetrical arrangement between the turbulence chamber and the annular gap.
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