308results about How to "Reduce the number of welds" patented technology

The invention relates to an installing method for a main pipeline of a coolant system of a nuclear power station, which is characterized in that the main pipeline of the coolant system of a reactor of the pressurized water reactor nuclear power station comprises a cool section (41) and a hot section (42), and a steam generator is directly connected with a main pump. According to the invention, the problem that the main pipeline is installed and welded by only a pressure container or steam generator in place by adopting the installing method of the main pipeline without a transition section issolved, and technical limit that the main pipeline is installed after the pressure container is in place and the steam generator or main pump is in place in the traditional main pipeline constructiontechnology is eliminated. A main pipeline groove is processed by adopting a site numerical control machining technology, the main pipeline and equipment connected with the main pipeline are subjectedto measurement, modeling and process monitoring by adopting a laser tracking measuring and 3D modeling technology, the main pipeline is regulated to meet the assembly welding requirement and is installed by using a narrow TIG (argon tungsten-arc welding) automatic welding technology, thus a feasible method is provided for shortening the construction period of the nuclear power station.

The invention discloses a single-side welding and double-side forming welding method for a ceramic gasket, and belongs to the welding field of material processing engineering. The method comprises the following steps of (1) treatment of grooves of abutted plates; (2) installation of the plates, and spot-welding fixing; (3) adding of the ceramic gasket; (4) baking for dehumidifying; (5) groove welding. The method does not need to carry out the operation that the welds of the back side are subjected to cleaning and welding operations after the structure is turned over, after the welds of the front side are welded, the double-side forming effect is directly realized, and the required matching of hoisting equipment and the required man-hours during turnover of the structure are reduced. The number of welds is reduced, and the operation of overhead welding positions is avoided. Therefore, the labor strength of workers is reduced, the welding difficulty is reduced, the production efficiency is greatly improved, and the production cost is reduced.

The present invention relates to automatic welding technology, and is especially automatic synchronous single side MIG and TIG welding method and apparatus. The present invention features that on the single welded surface, the front MIG welding gun and the rear TIG welding gun form two molten bath simultaneously, and after some time T, the TIG welding gun forms one TIG molten bath in the position with MIG molten bath. The present invention is suitable for automatic single side welding of homogeneous or hetreogeneous Al, Al alloy material as well as other metal material.

The invention discloses a welded pipe manufacturing method which includes preprocessing two grooves of an area to be welded of a welded pipe with each groove comprising a first chamfer portion, a second chamfer portion and a truncated edge portion connected with the first chamfering portion and the second chamfering portion; conducting location seam closure on the welding pipe, enabling the truncated edge portions of the two grooves to coincide after the seam closure, and enabling the first chamfer portions of the two grooves to be connected to form a first groove opening and the second chamfer portions of the two grooves to be connected to form a second groove opening; welding the truncated edge portions through laser welding till the truncated edge portions are almost subjected to weld penetration; conducting single-run filling cosmetic welding on the first groove opening and the second groove opening through submerged-arc welding. According to the welded pipe manufacturing method, butt connection of the truncated edge portions of the grooves in the middle of a welding seam is achieved through laser welding, then the submerged-arc welding is utilized to achieve single-run welding, welding times are reduced, preheating and heat insulation are not required, welding production efficiency can be greatly improved, post-welding surplus seam height and lossless yield of the welding seam are higher than those in the prior art, and the performances of the welding seam such as strength, toughness and bending performance are better than those in the prior art.

The invention discloses a lithium ion cylindrical battery. The lithium ion cylindrical battery comprises a shell and a roll core arranged in the shell; current collecting discs are fixedly connected to the two ends of the shell correspondingly; the roll core comprises a positive pole plate, an inner diaphragm, a negative pole plate and an outer diaphragm which are sequentially overlapped and woundinto a cylinder; a positive tab is arranged at one end of the positive pole plate; a negative tab is arranged at one end, far away from the positive tab, of the negative pole plate; the height of theroll core is smaller than that of the shell; the two ends of the roll core are of circular truncated cone structures; and annular grooves matched with the circular truncated cones on the roll core are formed in the current collecting discs. According to the lithium ion cylindrical battery of the invention, a part of the tabs are cut at the positive pole and the negative pole, so that the tabs arranged at intervals and connected with the pole plates can be obtained, and therefore, the length of the tabs is reduced, the length of the tabs is smaller than that of the pole plates, the weight of the battery is reduced; only one-time welding is needed, and therefore, welding frequency is reduced, welding quality is improved, and a reject ratio caused by welding breakdown is reduced.

The invention discloses self-positioning stepped twisted waveguide and a vacuum brazing process thereof. The self-positioning stepped twisted waveguide comprises a cover plate (1), a bottom plate (2) and a cavity (3) installed between the cover plate (1) and the bottom plate (2). The cavity (3) is formed by a plurality of assembling plates which are mutually buckled, each assembling plate is provided with a transmission port, the transmission ports are obliquely arranged in the assembling plates, and inclination angles increase progressively and sequentially or decrease progressively and sequentially; the outer side of the port of the cover plate (1) and the outer side of the port of the bottom plate (2) are respectively provided with a flange plate (4), one side of the frame wall of each assembling plate is provided with a groove (6), and the other side of the frame wall of each assembling plate is provided with a boss (7) matched with the corresponding groove (6). According to the self-positioning stepped twisted waveguide, the assembling plates which are mutually buckled are adopted and are provided with the transmission ports at different inclination angles so that the cavity of the twisted waveguide is formed; the transmission ports of the assembling plates are combined together to form an inner cavity of the cavity of the twisted waveguide so that the stepped inner cavity can be formed; because the cavity is divided into multiple assembling plates, rotating angles of the twisted waveguide can be easily controlled.

The invention discloses a manufacturing and installing method for an upper cone on a dry quenching furnace shell. The method includes the following steps that the upper cone on the dry quenching furnace shell is set out into a fan-shaped sample plate, and the outline of the fan-shaped sample plate is drawn on a manufacturing plane according to the practical proportion; a steel plate is fully laid on the outline of the whole fan-shaped sample plate, and a fan-shaped steel plate is formed in a welding mode. Four lifting lugs are arranged on the fan-shaped steel plate, the two middle lifting lugs are connected with a crane lifting hook through steel wire ropes, and the lifting lugs on the two sides are connected with the crane lifting hook through chain blocks and steel wire ropes. After the fan-shaped steel plate is lifted through the crane, three lifting lugs are arranged on the inner side of the fan-shaped steel plate and adjust contracting of the lower end of the fan-shaped steel plate through pulleys, chain blocks and steel wire ropes, and a conical steel plate is formed. The conical steel plate is welded to be manufactured into the upper cone of the dry quenching furnace shell, the upper cone of the dry quenching furnace shell is lifted and is in direct butt joint with the dry quenching furnace shell, and installation is completed. According to the manufacturing and installing method for the upper cone on the dry quenching furnace shell, the upper cone of the dry quenching furnace shell can be integrally spliced on the ground to be used, a temporary platform does not need to be erected, and time, labor and materials are saved.

The invention relates to a construction method for enabling water-cooling walls of a refuse incineration power generation waste heat boiler to integrally penetrate from a top. The construction method is characterized by comprising the following steps: step 1, manufacturing a water-cooling wall tool platform; step 2, assembling the water-cooling walls in a segmental mode on ground; step 3, mounting collecting boxes and the water-cooling walls in pairs; step 4, mounting rigid beams; step 5, enabling the water-cooling walls to integrally penetrate from the top; step 6, hoisting the water-cooling walls to the positions; and step 7, arranging an overhead row of tubes in pairs. With the adoption of a mounting method for the water-cooling walls of the waste heat boiler, water-cooling wall hoisting times and quantity of the overhead row of tubes welded in pairs are reduced, pipeline butt-welding quality control is convenient, the problem that part of the water-cooling walls are difficult to put in positions after a boiler steel structure is mounted can be efficiently solved, the construction period is effectively shortened, and potential safety hazards caused by overhead mounting operation and welding operation are further reduced. Meanwhile, a special clamping device for ground pipeline aligning and an overhead pipe row aligner are applied, so that working efficiency and project quality are effectively improved.

The invention relates to a rapid mixing device for ethylene and oxygen, which mainly solves the problem of unsatisfactory mixing effect of olefin and oxygen in the prior art. The present invention adopts a kind of rapid mixing equipment of ethylene and oxygen, comprising ethylene main pipe and mixing chamber, the end of ethylene main pipe is connected to the mixing chamber, a number of oxygen spiral distribution pipes are arranged in the mixing chamber, the plane of the spiral distribution pipe is perpendicular to the flow direction of ethylene, A number of oxygen nozzles are evenly distributed on each spiral distribution pipe. The direction of the nozzles is consistent with the flow direction of ethylene. The oxygen feed pipe is divided into several branch distribution pipes in the main pipe and enters the main pipe of ethylene, so that the ethylene entering from the main channel and the nozzle of the spiral distribution pipe are sprayed. The technical scheme of rapid mixing of the oxygen produced in the mixing zone solves the above problems well, and can be used in the mixing of ethylene and oxygen.

The invention provides a storage-tank cylindrical-section integral wallboard creep aging forming method. The method includes the steps of a), subjecting a storage-tank cylindrical-section wallboard to machining according to drawing dimension, milling an interior grid or an exterior grid of the wallboard to dimensional requirements and then subjecting the wallboard to pre-roll bending on roll bending equipment; b), welding the wallboard to an integral cylindrical wallboard along a longitudinal joint; c), performing finite element modeling subjected to creep aging forming, calculating stress to be borne by a sticking mold of the cylindrical-section wallboard after welding, meanwhile, calculating rebound quantity and manufacturing a forming mold according to the stress and the rebound quantity; d), placing the wallboard into the mold and applying forming pressure by the mechanical mode; e), placing the assembled mold into an aging furnace for heat preservation at the temperature ranging from 150 to 200 DEG C for 10-30 hours, and then taking out the mold from the aging furnace to obtain a cylindrical-section wallboard product. With the method, the storage-tank cylindrical-section integral wallboard is formed and welded at one step, the number of welding joints is reduced, and reliability in tank storage is improved.

The invention relates to the design technology of an international thermonuclear fusion experimental reactor, and particularly discloses a processing and manufacturing method of an ultra-long ultra-fine special-shaped multi-channel cooling plate. After raw materials for cooling plate processing are prepared, holes are drilled by electric sparks. Then a special-shaped channel is cut, and a rectangular strip is welded. Each of the raw material plates processed blind holes are welded into a whole plate. And drilling again by the electric spark, a molybdenum wire is passed through the through holes, the centers of small holes are taken as dead centers, and the small holes are cut into square holes with flow channels of 2.5 mm in length and 4.5 mm in width. The welding method and nondestructivetesting adopted in the processing technology are simple, easy to operate, the processing quality of the ultra-long ultra-fine special-shaped multi-channel cooling plate is effectively ensured and theprocessing success rate is improved.

The invention discloses an inflating device for mounting a tunnel wide-width waterproof board and a construction method and a mounting method. The inflating device comprises an inflating sac composed of an arched sac and a straight sac, the straight sac is erected on the arched sac, mounting bases are arranged at two ends of the arched sac, and both the arched sac and the straight sac are provided with inflating valves. The construction method of the inflating device includes steps of (1) unfolding the waterproof board to fix on the inflating sac of the inflating device; (2) inflating the inflating device to lift the waterproof board to an appointed position; (3) connecting the lifted waterproof board on an outline surface of a tunnel; (4) discharging and unloading the inflating device. Adjustment of mounting reserved sag of the waterproof board can be realized by inflating and deflating the straight sac in the process of mounting. The construction method and the mounting method of the waterproof board have the advantages of high construction efficiency, simplicity in operation, quickness, convenience, material conservation, high construction quality, safety, reliability and the like, and are applicable to on-site mounting and construction of the tunnel wide-width waterproof board and geotechnical cloth.