Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1975-06-17
1976-03-09
Shore, R. J.
Metal founding
Process
Shaping liquid metal against a forming surface
164105, 238162, 238164, B23K 2300
Patent
active
039425797
ABSTRACT:
A process for the aluminothermic welding of rails in which the rail ends to be joined are surrounded by a prefabricated, dry refractory casting mold and sealed from the rails with plastic mold materials, such as, moistened sand; a reaction crucible is arranged above the casting mold and filled with an aluminothermic reaction mixture; the rail ends are preheated, for example, by burning a mixture of propane and oxygen and directing the flames downwardly into the riser-duct of the casting mold for a period of time up to about 2 minutes and at a temperature between about 300.degree. C and about 700.degree.C; the aluminothermic reaction mixture in the reaction crucible is ignited; and, upon completion of the reaction of the aluminothermic reaction mixture, the lower outlet of the reaction crucible is opened and the steel melt is poured into the mold.
REFERENCES:
patent: 580971 (1897-04-01), Falk
patent: 1440256 (1922-12-01), Wattmann
patent: 1917868 (1933-07-01), Begtrup
patent: 2932863 (1960-04-01), Ahlert
patent: 2977651 (1961-04-01), Boutet
patent: 3103719 (1963-09-01), Bishop et al.
patent: 3495801 (1970-02-01), Kruger
Welding Handbook, Section One, Fifth Edition, edited by Arthur L. Phillips, pp. 7.7, 7.8, 5.12, Technical Library, published 1962.
Bryan James E.
Elektro-Thermit GmbH.
Shore R. J.
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