Method and apparatus for reducing smoke and preventing secondary

Details Method and apparatus for reducing smoke and preventing secondary Method and apparatus for reducing smoke and preventing secondary

1977-08-26

1978-10-17

Stallard, W.

Metal treatment

Compositions

Heat treating

266 49, 266 51, B23K 706

Patent

active

041207033

ABSTRACT:
A thermochemical scarfing process and apparatus capable of reducing the amount of smoke discharged to the atmosphere and/or of preventing the formation of "secondary" fins when spot scarfing, comprising:
(a) scarfing oxygen is directed against a reaction zone of molten metal on the surface of the workpiece to produce a scarfing reaction, and
(b) relative movement is provided between the oxygen stream and the workpiece, said reaction forming a molten puddle in front of the reaction zone that grows larger as the cut progresses, wherein the improvement comprises:
(c) directing at least one stream of non-reactive fluid to form a fluid, sheet-like curtain that provides a cover over the reaction zone and at least the rear portion of the molten puddle in such manner that said curtain forms a pocket with the surface of the workpiece.

REFERENCES:
patent: 2218141 (1940-10-01), Adams et al.
patent: 2284574 (1942-05-01), Jacobsson et al.
patent: 2465297 (1949-03-01), Thompson et al.
patent: 2664368 (1953-12-01), Babcock et al.
patent: 2754234 (1956-07-01), Holub et al.
patent: 2873224 (1959-02-01), Thompson et al.
patent: 3035947 (1962-05-01), Milton et al.
patent: 3163559 (1964-12-01), Thompson et al.
patent: 3354002 (1957-11-01), Gingerich et al.
patent: 3436276 (1969-04-01), Thompson
patent: 3455747 (1969-07-01), Lytle

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