Electric heating – Metal heating – By arc
Patent
1976-05-07
1978-10-17
Truhe, J. V.
Electric heating
Metal heating
By arc
239119, 350 63, 350 97, 350288, B23K 2700
Patent
active
041210859
ABSTRACT:
A laser system includes a nozzle assembly for use in directing a shielding gas around a laser beam and thereby protecting the point of focus from contamination by the atmosphere as is useful in welding and cutting applications. The nozzle includes a manifold section for admitting a shielding gas such as inert gas through a diffuser formed therein which exits from an outlet aperture through a nozzle tip section. The geometry of the nozzle is such that a certain amount of the shielding gas is flowed backward through an inlet aperture in the manifold section and thence into a housing container reflecting mirrors for directing and focusing the laser beam through the nozzle assembly. The remaining shielding gas, which is the bulk of the gas admitted, passes out through the outlet aperture in column fashion around the laser beam. By producing a back flow of shielding gas, aspiration of air through the housing and onto the workpiece is avoided. In addition, the necessity of having alternative means for preventing such aspiration in the form of windows or lenses closing off access to the housing is also prevented. The nozzle assembly is in two parts to facilitate interchanging of nozzle tips with the manifold, thereby providing a range of outlet opening sizes.
REFERENCES:
patent: 3696230 (1972-10-01), Friedrich
patent: 3742182 (1973-06-01), Saunders
patent: 3907408 (1975-09-01), Engel
patent: 3949878 (1973-07-01), Sullivan
patent: 3986767 (1976-10-01), Rexer et al.
patent: 4010345 (1977-03-01), Banas et al.
Diemer Donald P.
Hafele Joseph C.
Hawkins Robert H.
Simmons Gerald P.
Caterpillar Tractor Co.
Paschall M.
Truhe J. V.
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