A technique facilitates a welding operation in a variety of difficult environments, including downhole environments, to enable formation of a dependable connection between components. A tool may be constructed to contain a material mixture used in the welding operation. The tool is conveyed to a position adjacent a weld region of components to be welded together. The material mixture is of a type which may be ignited to initiate a reaction which forms a molten metal from at least one constituent in the material mixture. Additionally, the tool comprises a nozzle oriented to direct the molten metal to the weld region so as to form a secure, welded connection between the components.

A technique facilitates a welding operation in a variety of difficult environments, including downhole environments, to enable formation of a dependable connection between components. A tool may be constructed to contain a material mixture used in the welding operation. The tool is conveyed to a position adjacent a weld region of components to be welded together. The material mixture is of a type which may be ignited to initiate a reaction which forms a molten metal from at least one constituent in the material mixture. Additionally, the tool comprises a nozzle oriented to direct the molten metal to the weld region so as to form a secure, welded connection between the components.

A rail welding crucible and cap with burner-ignited reaction starter mix has a cap, an igniter core, and a crucible. The igniter core is a mixture of material that can be ignited by an oxygen/propane gas rail-preheating burner and forms the reaction starter mix for an aluminothermic reaction. The cap is mounted over the crucible and used to hold the igniter core in a desired position. A core-receiving hole traverses through the cap, from a first face to a second face. The igniter core is mounted within the core-receiving hole so that the igniter core can flow into a reaction cavity of the crucible. The reaction cavity is a receptacle within the crucible which serves as a temporary holder for a quantity of rail-bonding material that undergoes the aluminothermic reaction. The quantity of rail-bonding material becomes molten and flow onto the joint once the aluminothermic reaction reaches a desired phase.

A rail welding crucible and cap with burner-ignited reaction starter mix has a cap, an igniter core, and a crucible. The igniter core is a mixture of material that can be ignited by an oxygen/propane gas rail-preheating burner and forms the reaction starter mix for an aluminothermic reaction. The cap is mounted over the crucible and used to hold the igniter core in a desired position. A core-receiving hole traverses through the cap, from a first face to a second face. The igniter core is mounted within the core-receiving hole so that the igniter core can flow into a reaction cavity of the crucible. The reaction cavity is a receptacle within the crucible which serves as a temporary holder for a quantity of rail-bonding material that undergoes the aluminothermic reaction. The quantity of rail-bonding material becomes molten and flow onto the joint once the aluminothermic reaction reaches a desired phase.

A welding tape for thermally connecting metal workpieces by fusion, wherein the welding tape in a cross section has an outwardly closing cover layer which comprises an inner cover layer and an outer cover layer, wherein in the transverse direction provision is made at least in side edge regions of the inner cover layer for adhesive layers by means of which the welding tape can be fastened to the workpieces to be connected, wherein in the interior of the cover layer provision is made for a self-combusting exothermic substance, which during ignition provides the thermal energy which is required for the welding, wherein a non-combustible heat shield is arranged exclusively between the exothermic substance and the outer cover layer, and wherein a welding additive is provided between the exothermic substance and the inner cover layer.

A welding tape for thermally connecting metal workpieces by fusion, wherein the welding tape in a cross section has an outwardly closing cover layer which comprises an inner cover layer and an outer cover layer, wherein in the transverse direction provision is made at least in side edge regions of the inner cover layer for adhesive layers by means of which the welding tape can be fastened to the workpieces to be connected, wherein in the interior of the cover layer provision is made for a self-combusting exothermic substance, which during ignition provides the thermal energy which is required for the welding, wherein a non-combustible heat shield is arranged exclusively between the exothermic substance and the outer cover layer, and wherein a welding additive is provided between the exothermic substance and the inner cover layer.

A programmable exothermic reaction controller includes input/output control circuitry for inputting and outputting information to/from the controller, processing circuitry including user programmable parameters, wherein the parameters are programmable using the input/output control circuitry and an output connector connectable to an ignitor cable.

A programmable exothermic reaction controller includes input/output control circuitry for inputting and outputting information to/from the controller, processing circuitry including user programmable parameters, wherein the parameters are programmable using the input/output control circuitry and an output connector connectable to an ignitor cable.

A rail welding crucible and cap with burner-ignited reaction starter mix has a cap, an igniter core, and a crucible. The igniter core is a mixture of material that can be ignited by an oxygen/propane gas rail-preheating burner and forms the reaction starter mix for an aluminothermic reaction. The cap is mounted over the crucible and used to hold the igniter core in a desired position. A core-receiving hole traverses through the cap, from a first face to a second face. The igniter core is mounted within the core-receiving hole so that the igniter core can flow into a reaction cavity of the crucible. The reaction cavity is a receptacle within the crucible which serves as a temporary holder for a quantity of rail-bonding material that undergoes the aluminothermic reaction. The quantity of rail-bonding material becomes molten and flow onto the joint once the aluminothermic reaction reaches a desired phase.

A rail welding crucible and cap with burner-ignited reaction starter mix has a cap, an igniter core, and a crucible. The igniter core is a mixture of material that can be ignited by an oxygen/propane gas rail-preheating burner and forms the reaction starter mix for an aluminothermic reaction. The cap is mounted over the crucible and used to hold the igniter core in a desired position. A core-receiving hole traverses through the cap, from a first face to a second face. The igniter core is mounted within the core-receiving hole so that the igniter core can flow into a reaction cavity of the crucible. The reaction cavity is a receptacle within the crucible which serves as a temporary holder for a quantity of rail-bonding material that undergoes the aluminothermic reaction. The quantity of rail-bonding material becomes molten and flow onto the joint once the aluminothermic reaction reaches a desired phase.