93 results about "Exothermic welding" patented technology

An assembly and method are disclosed for exothermic welding including a mold which is formed of a material which withstands exothermic welding temperatures, and includes a weld cavity therein for positioning at least two members which are to be exothermically welded together adjacent to each other, and an ignition cavity communicating with the first cavity. The members which are to be exothermically welded together are positioned adjacent to each other using the weld cavity, and a weld metal cartridge is positioned in the ignition cavity. The cartridge comprises a container having copper walls which define a chamber therein, and a particulate weld metal in the chamber. The tip of an electrical igniter is positioned into the chamber of the container and particulate weld material therein, the igniter is electrically fired while the container is in the ignition cavity of the mold to melt the particulate weld material, and the contents of the ignition cavity are passed after melting the particulate weld metal to the weld cavity to weld the members together.

A high melting point exothermic welding flux for a copper-clad steel/copper grounding grid belongs to the metal welding field. The existing exothermic welding flux for welding copper-clad steel has the defects of lower melting point of the metal on a joint than the temperature of a base material, poor structural uniformity and the like. The exothermic welding flux comprises the following components by weight percent: 50-60% of copper oxide, 9-10% of aluminium metal powder, 20-35% of copper metal powder, 3-4% of fluorite powder, 2-3% of tin metal powder, 0-5% of nickel metal powder and the balance alloy powder. The exothermic welding flux has the melting temperature close to that of the base metal, and can assure that a grounding body formed by the joint and the base material has even reliability.

An exothermal weld mold includes a mold section with an integral cover portion, made as part of a single piece of material with the rest of the mold section. The mold section may be a mold half of a vertically split mold, or may constitute most of a half of the mold. The cover portion may be part of an integral cover that covers substantially all of a reaction chamber or crucible of the mold. The cover may have one or more vent holes, in the top and/or side of the mold. The cover may have a baffled passage for expansion of gases produced by reaction of the weld material, before the gases are expelled from the mold at an opening in the top or side of the mold. The passage may be a serpentine passage. A filter may be placed in the passage.

The invention relates to the industry of electrolytic aluminum, and in particular to a method for performing repair work under the condition of no series power failure in the occurrence of damage to a cathode flexible bus of an aluminum electrolysis cell. The method provided by the invention comprises following steps: 1. steps of removing, grinding and flattening; 2. a step of welding a transition aluminum block; 3. a step of welding an explosion block; 4. a step of making preparation for welding; 5. a step of filling a heat release welding flux; 6. a step of heating a welding part; 7. a step of ignition; and 8. removing a mould after naturally cooling a cavity; performing insulation treatment on the welding part and slowing the cooling in places where the climate is cold; and after the completion of the welding, cleaning a site. With the adoption of the method provided by the invention, the cathode flexible hose of the aluminum electrolysis cell can be welded without the series power failure; due to good generality, the method is applicable for various slots; in such a way, the series power failure of the electrolytic cell is prevented, the ferrous welding under a strong magnetic field is prevented, and the condition that the heat release welding cannot be directly used for the flexible bus with a laminated structure is prevented; and therefore, the economic benefits of an aluminum electrolysis enterprise are improved, and the technical difficult in repairing the cathode flexible bus is solved for the aluminum electrolysis enterprise.

The invention discloses exothermic welding powder for welding novel grounding grid materials. The exothermic welding powder comprises, by weight, 45%-60% of copper oxide, 8%-13% of aluminum powder, 20%-30% of copper powder, 5%-15% of copper-phosphorus alloy powder, 1%-5% of tin powder, 2%-6% of fluorite powder, 1%-4% of borax powder and the balance alloy powder. The alloy powder comprises, by weight, 8%-12% of Ca, 40%-47% of Si, 28%-32% of Ba and the balance impurities. According to the exothermic welding powder, raw materials are low in price and easy to get, the problems that pores, slag inclusion, hot tear and the like can be easily generated in the welding process by using the exothermic welding powder are solved, the quality of welded joints is reliable, the connecting cost of the novel grounding grid materials is lowered, and the development of a grounding system in electric power engineering in China is facilitated.

The invention relates to the electrolytic aluminum industry, in particular to an in-situ power-cut-free welding method for soft mother belts and an aluminum bus of the cathode of an aluminum electrolysis cell. The method comprises the following steps of 1 in-situ grinding, 2 in-situ fixing, 3 in-situ fusion, 4 pre-welding treatment, 5 preheating, 6 exothermic welding and 7 post-welding treatment. By means of the method, in-situ connection between the soft mother belts and the aluminum bus is directly completed through exothermic welding, the defect that the soft mother belts of a sheet type structure cannot be directly welded in a magnetic field is overcome, the economic benefits of an aluminum electrolysis enterprise are increased, and repairing of the soft mother belts for the aluminum electrolysis enterprise is realized. The operation can be completed under the condition that serial aluminum electrolysis cells are powered all the time, and the repairing purpose can be achieved on the promise of not affecting production of the serial aluminum electrolysis cells. The method is suitable for welding of the soft mother belts and the aluminum bus in various cell types, and is good in universality, easy to operate and high in welding repair efficiency.

An exothermal weld mold includes a mold section with an integral cover portion, made as part of a single piece of material with the rest of the mold section. The mold section may be a mold half of a vertically split mold, or may constitute most of a half of the mold. The cover portion may be part of an integral cover that covers substantially all of a reaction chamber or crucible of the mold. The cover may have one or more vent holes, in the top and/or side of the mold. The cover may have a baffled passage for expansion of gases produced by reaction of the weld material, before the gases are expelled from the mold at an opening in the top or side of the mold. The passage may be a serpentine passage. A filter may be placed in the passage.

The invention relates to self-propagating welding powder, which is prepared from the following raw materials according to mass percent: 15 to 30% of aluminium powder, 30 to 40% of copper powder, 40 to 60% of barite powder and 4 to 7% of calcium fluoride. The copper powder is melt to form molten metal of high temperature using a lot of heat generated by the oxidation-reduction reaction of the aluminium powder and the barite powder; and the molten copper of high temperature is adopted to weld the fillers of a weld groove. The aluminum oxide generated by reaction is combined with silicon dioxide and calcium fluoride in barite to promote the molten metal and slag to be separated. The reaction process is stable and a good welding effect can be achieved during exothermic welding.

An ignition powder for copper-clad steel/copper grounding grid exothermic welding belongs to the metal welding field. The existing ignition powder for exothermic welding has the problems of poor safety, no environmental protection, complex components, high reaction brightness and the like. The ignition powder for exothermic welding comprises the following components by weight percent: 20-70% of copper oxide powder with granularity of 40-80 meshes and 85% of oxidation degree; 0-50% of copper oxide powder with granularity of 200-300 meshes and 99.9% of oxidation degree; 10-15% of aluminium metalpowder with granularity of 200-300 meshes and 99.9% of purity; and 15-35% of magnesium metal powder with granularity of 40-100 meshes and 99.9% of purity. The ignition powder has the advantages of simple components, environmental protection, good safety, even reaction speed, moderate brightness and the like.

The invention relates to the technical field of aluminum electrolysis, and particularly relates to an electrolytic tank electric aluminum bus and aluminum soft tape damage re-welding repairing method. The electric heat-release welding method comprises the following steps of: 1) selection of crucible materials; 2) preparation of a crucible die; 3) preparation of a welding die; 4) preparation of a pouring piece and a blocking piece; and 5) welding. The method provided by the invention designs a 200kA electrolytic tank aluminum bus and soft band electric welding die by use of the heat-release welding principle and successfully performs electric welding. Through the method provided by the invention, the electrolytic tank aluminum bus and soft band electric welding can be performed for an electrolytic tank by a heat-release welding mode without cutting power, and the power cut of the electrolytic tank is not required, thus the cost can be saved, and the repairing cost is reduced.

The invention relates to the technical field of welding powder of welding materials, in particular to exothermic welding powder. The welding powder comprises alloy powder and composite powder particles, wherein the alloy powder comprises, by weight, 49-50% of copper, 47-48% of aluminum, 0.8-1.2% of calcium, 0.8-1.2% of tin, 0.4-0.6% of iron, 0.1-0.3% of carbon, 0.1-0.3% of rare earth and 0-0.2% ofsilver, and the composite powder particles comprises, by weight, 12-16 parts of aluminum powder, 18-24 parts of copper oxide powder and 3-5 parts of slag-making agents. According to the exothermic welding powder, the composite powder particles are added into the alloy powder, by triggering the chemical reaction in the composite powder particles, a lot of heat are released, the fluidity of moltenmetal is greatly increased, the replacement reaction rate of the exothermic welding powder is speeded up, meanwhile, mixing of raw materials is more even, after cooling, the connection strength is good, the surface is smooth, and the welding part quality is stable.

The invention relates to a safety remote-control ignition rod, in particular to a safety appliance which is used for ensuring the body security of operation technicists during metal welding by use of an exothermic welding flux, and belongs to the technical field of welding. The safety remote-control ignition rod comprises a resistance wire, a guide-in pipe, insulating blocks, a first wire, a second wire and a plug connector, wherein the first wire and the second wire are mounted in the guide-in pipe in the length direction; the right end part of the first wire is connected with the right end part of the second wire through the resistance wire; the insulating blocks are arranged between the first wire and the second wire; the plug connector is arranged on the left side of the left end part of the guide-in pipe; and the left end part of the first wire and the left end part of the second wire are inserted into the plug connector. The safety remote-control ignition rod is simple, safe and reasonable in structure, takes the resistance wire as the main element, realizes 'direct' ignition, and ensures that the technicists are prevented from being injured by jetting during reaction of the exothermic welding flux; and hands of the technicists can be moved from 8 cm away from a die to a safe operation area 1-5 m away from the die.

A welding tool for welding a blanking plate within a wellbore casing downhole thereby sealing the wellbore is described. The tool comprises a tubular body of a diameter sufficiently narrow to fit in a wellbore casing, the tubular body having a downhole end and a surface end; and a welding head assembly connected to the downhole end of the tubular body. The welding head assembly comprises a connector device for retaining a blanking plate to be welded within the wellbore casing, and a welding powder container which comprises a chamber for holding the exothermic welding powder, the chamber having at least a portion extending adjacent the blanking plate to be retained and proximate the wellbore casing to which the blanking plate is to be welded when the tool is positioned downhole in the wellbore casing; and an igniter wire opening for accommodating an igniter wire extending into the chamber.

Trigger devices for igniting an exothermic reaction is provided. The trigger devices may be flint type trigger devices and electronic type trigger devices. The flint type trigger device has a housing with a spark opening on a rear wall of the housing. A mold mounting assembly is secured to an exterior of the rear wall of the housing. A motor assembly is secured to the inside of the rear wall of the housing. The motor assembly has a flint wheel attached to a shaft of a motor, where the flint wheel is located adjacent the spark opening. A flint assembly is positioned within the housing such that a flint of the flint assembly is in contact with the flint wheel. A controller positioned within the housing is configured to selectively activate the motor to cause the flint wheel to rotate against the flint to create one or more sparks that are ejected from the spark opening.

The invention relates to the technical field of exothermic welding, in particular to exothermic welding powder and a preparation process and an application method thereof, and solves the problem of easy spontaneous combustion or explosion of the exothermic welding powder. The exothermic welding powder comprises 50-65 mass parts of aluminum copper alloy, 120-150 mass parts of copper oxide, 3-5 massparts of nickel, 3-5 mass parts of calcium fluoride, 3-4 mass parts of calcium oxide, 2-3 mass parts of chromium, 2-3 mass parts of silicon, 1-2 mass parts of boron, 1-2 mass parts of barium, 0.5-1 mass part of platinum. Traditional welding powder is easy to generate spontaneous combustion or explosion; the root cause is that aluminum powder in the traditional welding powder is easy to generate spontaneous combustion or explosion; aluminum copper alloy powder is higher in combustion point compared with common aluminum powder; the combustion point of the common aluminum powder is about 550 DEGC; and the combustion point of the aluminum copper alloy powder is increased above 730 DEG C, so that the combustion point is increased by above 32%, and the safety of the welding powder in the transportation process is improved.

The invention discloses a solder for exothermal soldering of a railway track joint, an igniting agent and a soldering method, and relates to a solder, an igniting agent and a soldering method. The invention solves the problems about high hot brittleness of the joint, production of pores and oxidative ablation in the conventional exothermal soldering of the steel. The solder for the exothermal soldering of the railway track joint is formed by mixing ferric oxide powder, iron powder, industrial aluminum powder, molybdenum powder, titanium powder, ferrosilicon powder, fluorite powder, marble powder and lanthanum-cerium alloy powder; the igniting agent for the solder is formed by mixing magnesium powder, ferric oxide powder, industrial aluminum powder, potassium permanganate powder and red phosphorus powder; and the welding method comprises the following steps of: weighing the solder for the exothermal soldering of the railway track joint and the igniting agent for the solder in a mass ratio of (78-82): 1, soldering by adopting an exothermal soldering method, and thus finishing soldering of the railway track joint. The invention mainly relates to the solder for the exothermal soldering of the railway track joint, the igniting agent for the solder and the soldering method.

The present invention relates to an ignition device for exothermic welding comprising an electrically conductive metal bushing (1) that can house a pellet of a first welding material (4) in electrical contact with the inner wall of an inner chamber (1c) of the bushing (1), provided with an electrically insulating cap (2) and a bottom base (1b) with an opening (1d) through which the first welding material (4) falls in an incandescent state onto a second welding material (4a) arranged in a weld mold (7) when an exothermic reaction has been triggered in the first welding material (4); an electrode (5) that goes through the cap (2) of the metal bushing (1) and comprises a top contact (5a) connectable to a power output (24) of a voltage generator and a bottom contact in the form of a filament (5b) that can be in electrical contact with the pellet of the first welding material (4), the filament (5b) being made of a material having a melting temperature greater than the ignition temperature of the welding material (4); as well as a contact-assuring element (3) which is guided into the inner chamber (1c) between the bottom base (1b) and the pellet of the first welding material (4).

An exothermic weld mold clamp including a mold locating system adapted to locate pieces of an exothermic mold relative to each other; and a mold locking system. The mold locking system includes at least one mold locking pin movably mounted on the mold locating system and a spring biasing the locking pin towards a locking position with at least one of the exothermic mold pieces.

The invention provides an installation and construction technology of grounding copper cables. The technology comprises the steps of: installing and positioning the grounding copper cables; installing a vertical grounding electrode; burying the grounding copper cables; laying the grounding copper cables on various layers of a building; laying a roof lightning protection belt; and carrying out indoor grounding network construction. The welding and connecting technology in the indoor grounding network construction step is an exothermic welding process and specifically comprises the following steps of: selecting a proper mold according to the joint form of the grounding copper cables; cleaning the connection positions of the grounding copper cables; adding reaction powder; and carrying out ignition for welding the cables and cleaning the mold. The same or different metals of copper and copper, copper and steel and the like can be completely fused by the exothermic welding process; and real molecules combination is achieved, so that a lightning-proof grounding device becomes a permanent maintenance-free device; the grounding protection technology provided by the invention is very perfect; the leakage damage of equipment is effectively prevented; the manpower resource is saved; and the time limit for a project is shortened.