Patents
Literature
9 results about "Electroslag welding" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Electroslag welding (ESW) is a highly productive, single pass welding process for thick (greater than 25 mm up to about 300 mm) materials in a vertical or close to vertical position. (ESW) is similar to electrogas welding, but the main difference is the arc starts in a different location. An electric arc is initially struck by wire that is fed into the desired weld location and then flux is added. Additional flux is added until the molten slag, reaching the tip of the electrode, extinguishes the arc. The wire is then continually fed through a consumable guide tube (can oscillate if desired) into the surfaces of the metal workpieces and the filler metal are then melted using the electrical resistance of the molten slag to cause coalescence. The wire and tube then move up along the workpiece while a copper retaining shoe that was put into place before starting (can be water-cooled if desired) is used to keep the weld between the plates that are being welded. Electroslag welding is used mainly to join low carbon steel plates and/or sections that are very thick. It can also be used on structural steel if certain precautions are observed, and for large cross-section aluminium busbars. This process uses a direct current (DC) voltage usually ranging from about 600 A and 40-50 V, higher currents are needed for thicker materials. Because the arc is extinguished, this is not an arc process.
A narrow-band electroslag welding auxiliary device for large connecting pipes of petrochemical heat exchanger tube box
An auxiliary device for narrow-strip electroslag welding of large-diameter tube fittings in petrochemical heat exchanger tube boxes is disclosed. This invention relates to the field of petrochemical heat exchanger tube boxes. Existing argon arc welding methods suffer from low deposition efficiency and require meticulous point-by-point, layer-by-layer operations, resulting in long welding times for individual tube fittings. This invention comprises an auxiliary roller, a tube box fitting, a transition connector, and a rotating roller frame. The auxiliary roller is mounted on the roller of the rotating roller frame, which drives the auxiliary roller to rotate. The tube box fitting is installed inside the auxiliary roller, and the transition connector is installed on the inner wall of the auxiliary roller, with its tail fixedly connected to the inner wall of the auxiliary roller and its head connected to the tube box fitting. By rotating the tube box fitting driven by the auxiliary roller and transition connector, narrow-strip electroslag welding of large-diameter tube box fittings or small-diameter cylinders is achieved, improving welding efficiency. This invention is applied in the field of petrochemical heat exchanger tube box welding.
Owner:HARBIN BOILER CO LTD
Electroslag welding apparatus and method of welding
This invention provides an electroslag welding apparatus and a welding method thereof. The electroslag welding apparatus includes a workpiece body and a power source. A slag pool is disposed within the workpiece body, and a molten pool is disposed below the slag pool. Metal slag in the slag pool accumulates below the molten pool after passing through it, forming a weld. A liquid-cooled forming slider is disposed around the periphery of the molten pool. The height of the molten pool increases with the accumulation of the weld, and the height of the liquid-cooled forming slider also increases with the molten pool. Furthermore, a first conductive path is provided between the slag pool and the positive electrode of the power source, a second conductive path is provided between the weld and the negative electrode of the power source, and a third conductive path is provided between the liquid-cooled forming slider and the negative electrode. The electroslag welding apparatus provided by this invention can solve the problem of poor weld formation quality in the prior art.
Owner:MCC (SHANGHAI) STEEL STRUCTURE TECHNOLOGY CORP LTD
Method, control device, welding system and storage medium for controlling electroslag welding or electro-gas welding
The coefficient information is determined based on a parameter specified for a project included in construction information of the project including a welding method and a welding material, the projects of welding conditions in welding include at least a welding current, a wire feeding speed, and a projection length, a reference value for a project of the welding conditions that is not specified is calculated based on a set value specified for at least two of the projects of the welding conditions and the determined coefficient information, and a control amount for the project of the welding conditions that is not specified is calculated based on the reference value.
Owner:KOBE STEEL LTD
Slag leakage prevention assembly for electroslag welding
ActiveCN224157929UWelding/cutting auxillary devicesAuxillary welding devicesSlag (welding)Electroslag welding
The utility model aims at providing an electroslag welding slag leakage prevention assembly which is characterized by comprising a partition plate, a first baffle and a second baffle, the first baffle and the second baffle are fixedly connected to the two sides of the partition plate respectively and extend out of the edge of the same side of the partition plate, and the side end face, located between the first baffle and the second baffle, of the partition plate is a welding face. The welding surface and two opposite side surfaces of the first baffle plate and the second baffle plate form a melting groove; the first baffle and the second baffle each comprise a joint face parallel to the welding face and in the same direction, and a plurality of containing through grooves which are different in depth and penetrate in the length directions of the containing through grooves are formed in the two joint faces. The slag leakage prevention assembly further comprises filler which is made of flexible fireproof materials and can be placed in the containing groove, and the top of the filler is higher than the joint face after the filler is placed. By means of the mode that the containing through grooves with the different depths are formed in the joint face of the baffle and matched with the filler, the assembling gaps with the variable sizes are filled, and therefore slag leakage is avoided, and meanwhile the welding effect can be improved.
Owner:ZHEJIANG DADONGWU CONSTR TECH CO LTD
Flux for electroslag welding and electroslag welding method
ActiveUS12558745B2Welding/cutting media/materialsSoldering mediaElectroslag weldingPhysical chemistry
A flux for electroslag welding used for electroslag welding may include a basic oxide, an amphoteric oxide, an acidic oxide, and a fluoride. With respect to a total mass of the flux, the basic oxide may include 5.1 mass % or more and 30.0 mass % or less of CaO, the acidic oxide includes 17 mass % or less of SiO2, and the fluoride includes 35 mass % or more and 73 mass % or less of CaF2. A content of the CaO is 30 mass % or more with respect to a total mass of the basic oxide, a content of the SiO2 is 80 mass % or more with respect to a total mass of the acidic oxide, a content of the CaF2 is 80 mass % or more with respect to a total mass of the fluoride, and a value of (2×[CaF2]+[CaO]) / [SiO2] is 5 or more and 56 or less.
Owner:KOBE STEEL LTD
Construction method for box column partition adopting single-side electroslag welding
The present application relates to steel structure welding process technical field, specifically disclose a kind of construction method of box column partition plate adopts single-sided electroslag welding welding, 1) blanking: cutting partition plate and baffle;2) groove processing: groove a1 of one kind is CO2 gas shielded welding, another is groove a2 of electroslag welding in partition plate edge processing;3) assembly: first partition plate and baffle are assembled together;4) partition plate welding: CO2 gas shielded welding is used to connect weld of partition plate and lower wing plate, left web plate, right web plate, after welding, assembly upper wing plate;5) bottoming and filling welding: CO2 gas shielded welding is used to bottoming filling welding of wing plate and web plate connecting weld;6) electroslag welding: electroslag welding weld is generated at the junction of partition plate and upper wing plate;7) cap welding: remove arc and arc high part, repair welding electroslag welding hole both sides reserved part;The present application can guarantee the quality inside weld, and also reduce construction cost, improve work efficiency.
Owner:LAIWU IRON & STEEL GRP CONSTR & INSTALLATION ENG CO LTD
Electroslag welding equipment
To improve the flux supply method in electroslag welding. [Solution] The electroslag welding apparatus 1 comprises a flux supply device 30 that supplies flux into the groove 6, and a control unit 100 that controls the flux supply device 30. The control unit 100 calculates the initial amount of flux to be supplied to the groove 6 based on information about the groove cross-sectional area when forming a slag bath 50 in the groove 6, and controls the supply of that initial amount of flux into the groove 6.
Owner:NIPPON STEEL WELDING & ENGINEERING CO LTD
Rail electroslag welding shape control method and system coupled with magnetic field and temperature field
The present application belongs to the field of welding forming, and particularly discloses a steel rail electric-shield welding shape control method and system coupled with magnetic field and temperature field, which comprises: the steel rails to be welded have a welding gap between them, and the welding gap can accommodate three electric-shield welding nozzles; two water-cooled copper molds are respectively arranged on the two sides of the steel rails to be welded, and a magnetic field stirring device is installed simultaneously; the steel rails to be welded are welded, and for any moment of the steel rails: a molten pool temperature field picture within a first time threshold before the current moment is acquired; welding parameters within a second time threshold before the current moment are acquired; a heat accumulation feature of the current moment is determined based on the acquired welding parameters and molten pool temperature field picture; the heat accumulation feature is input into a trained discrimination model to determine real-time parameter values of the water-cooled copper mold and the magnetic field stirring device, thereby realizing molten pool control at the current moment. The present application adopts a real-time joint control mode of temperature field and magnetic field stirring, and couples heat accumulation information to improve the quality of the welded joint.
Owner:HUAZHONG UNIV OF SCI & TECH
Temperature field coupled steel rail three-wire molten nozzle electroslag welding shape control method and system
The present application belongs to the field of welding forming, and discloses a temperature field coupled steel rail three-wire welding nozzle electric slag welding shape control method and system, which comprises the following steps: placing the to-be-welded steel rails in the welding position, the to-be-welded steel rails having a welding gap therebetween, the welding gap being capable of accommodating three electric slag welding nozzles, each nozzle having a welding wire therein; placing two water-cooled copper molds on the two sides of the to-be-welded steel rails; designing welding process parameters based on the welding gap, starting three-wire electric slag welding, and acquiring the temperature field in the welding steel rail molten pool in real time, and adjusting the welding process parameters in real time based on the temperature field; the welding process parameters at least include the flow of the water-cooled copper mold. The present application can improve the quality of the steel rail welding joint and ensure near-net forming of the steel rail weld.
Owner:HUAZHONG UNIV OF SCI & TECH