Nozzle for the surface treatment of metal workpieces
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United States of America Patent
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Jun 14, 1994
Grant Date -
N/A
app pub date -
Dec 8, 1992
filing date -
Jun 24, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a nozzle for the surface treatment of metal workpieces, in particular for the powder build-up welding or thin-layer alloying of highly stressed metal components, which can be selectively connected to a mirror-focused or a lens-focused high-energy beam installation, preferably a high-performance laser installation, by using the cooling medium units, inert gas lines and powder conveyors/extractors provided. In comparison with known laser spray nozzles, the nozzle guarantees a directionally-independent coating of highly stressed metal components with a regular annular distribution of the stream of powder-delivery gas and inert gas supplied. With this a defined flow of powder material, which is made up of a determined quantity of powder and a determined percentage of delivery gas, is distributed via a special powder supply appliance, so that the apex of the outlet of the stream of powder-delivery gas represented as an inverted cone coincides with the defocused laser beam outside the nozzle, and there the melting on of the powder particles and thus the formation of a melting bath with little melting onto the substrate and thus the build-up welding process itself occur.
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