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US 5,145,106 AGranted
Welding apparatus and method
AssigneeERICO International Corporation
InventorsDean T. Moore, George F. Kub, Jr., Kenneth A. Golonka, Sr.
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AssigneeERICO International Corporation
InventorsDean T. Moore, George F. Kub, Jr., Kenneth A. Golonka, Sr.
Estimating the term…
A welding apparatus and method characterized by an electrically activated high temperature igniter with a pair of lead wires adapted to be connected to a high energy source of current and a high resistance bridge between the leads. The bridge is coated with an ignition material comprising a mixture of fine aluminum, one or more metal oxides or oxygen containing compounds and a binder. The welding apparatus has a vessel filled with exothermic material. When the lead wires are supplied with a high energy electrical current, the lead wires cause the ignition material to ignite in turn causing the exothermic material to ignite. If the coated bridge wire is positioned above the exothermic material, the igniter will broadcast multiple points of ignition over the top of the exothermic material.
Exothermic welding apparatus comprising a vessel containing an exothermic material adapted to be converted to molten metal and slag upon ignition, an electrical igniter for igniting said exothermic material comprising a pair of leads extending into said vessel, said leads being connected by a high resistance bridge, said bridge being coated with an ignition material having an ignition temperature in excess of 1000.degree. C., and means to supply a high energy electrical current to said leads to cause said ignition material to ignite and in turn to cause said exothermic material to ignite.
In combination, a vessel containing exothermic material and an electrical igniter for igniting said exothermic material comprising a high resistance bridge wire coated with a high temperature ignition material having an ignition temperature in excess of 1000.degree. C. whereby when a high energy current is impressed across said bridge wire to ignite said ignition material, the ignition material will in turn ignite said exothermic material.
Dependencies are inferred from the claim text.