Exothermic welding and method

Details Exothermic welding and method Exothermic welding and method

1988-04-04

1989-12-05

Shaw, Clifford C.

Electric heating

Metal heating

By arc

228241, B23K 906

Patent

active

048854522

ABSTRACT:
Exothermic reaction mixtures are economically ignited remotely and electrically without the use of a low ignition starting material by creating a predetermined spark gap within a matrix of such mixture and then impressing a high energy spark across the gap through the use of a capacitor discharge circuit. The mixture is contained in a graphite or ceramic vessel or crucible and is supported over a tap hole or runner by a fusible metal disk. The material of the vessel is preferably graphite which is electrically conductive. In one form of the invention, an insulated wire with a bare tip is positioned just below the top surface of the mixture and the tip spaced a predetermined distance from the wall of the vessel. The capacitor discharge circuit is then employed to fire a high energy spark through a matrix of the material across the gap formed between the wire and vessel to initiate the reaction. In another form the spark gap may be established in a small cylindrical cartridge containing the material. The cartridge may be positioned through a hole in the side wall of the mold just below or near the top of the exothermic material so that it can be filled with the material from the main body of the exothermic material.

REFERENCES:
patent: 3020610 (1962-02-01), Rejdak
patent: 3955505 (1976-05-01), Johnston
patent: 4182947 (1980-01-01), Brower

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