503results about How to "Improve connection strength" patented technology

The invention discloses a clamp connection-type connecting device in a sleeve and its connection structure and an installation method thereof. The clamp connection-type connecting device in the sleevecomprises the sleeve and a connection bar and a clamp-connection member, and the connection bar is capable of being inserted in the sleeve from an end part of the sleeve; the clamp-connection memberis subjected to clamp connection at an inner side of two ends of the sleeve, and is used for obstructing the clamp-connection member positioned in the sleeve to move to a direction of pulling the sleeve out, and the structure has the advantages of convenient installation and low cost; a slip-casting aperture is arranged at the sleeve, a cement mortar can be injected in the sleeve through the slip-casting aperture and end ports at two ends of the sleeve, after the cement mortar is solidified, the connection strength between the sleeve and the connection bar is increased, and the connection strength of walls can be increased.

The invention relates to a tungsten-rhenium-molybdenum alloy rotary anode target material for an X-ray tube and a preparation method thereof, wherein the target material relates to the technical field of powder metallurgy. The tungsten-rhenium-molybdenum alloy rotary anode target material for the X-ray tube comprises a tungsten-rhenium alloy layer and a molybdenum alloy layer. Tungsten-rhenium pre-alloy powder and molybdenum alloy powder are used as raw materials. The tungsten-rhenium-molybdenum alloy rotary anode target material is prepared through the steps of a compression molding step, a high-temperature sintering step, a hot isostatic pressing step, a straightening shaping step and a machining step, wherein the compression molding step, the high-temperature sintering step, the hot isostatic pressing step, the straightening shaping step and the machining step are successively performed. The tungsten-rhenium-molybdenum alloy prepared by the invention has excellent performances of small crystal grain, uniform tissue, relatively low impurity element content, high compactness, high strength, etc. The rotary anode target prepared by the tungsten-rhenium-molybdenum alloy for the X-ray tube has advantages of high product qualified rate, high heat dissipation performance, high heat impact resistance, long service life, etc.

A composite of metal and resin includes a metal piece and a resin piece combined with the metal piece. A surface of the metal piece defines a plurality of micropores including an upper portion and a lower portion, the upper portion is communicated with the lower portion, and an aperture of the lower portion is larger than an aperture of the upper portion. The lower portion includes an undercut portion. The resin piece is partially embedded into the lower portion and the upper portion of the micropores. A method of manufacturing the composite of metal and resin is also provided.

The invention discloses a multi-directionally preformed braided part, which comprises at least two components having different forming directions. Fiber bundles inside the braided part run through the components along different forming directions to form an integral structure. The intersection position of the components having different forming directions is provided with a through hole. The invention also provides a three-dimension integrally braiding method of the multi-directionally preformed braided part, which comprises: a step 1 of determining forming directions; a step 2 of determining a theoretical intersection position; a step 3 of determining a thread leading region and a thread adding region for theoretical intersection; a step 4 of braiding the first component, in which a fiber bundle passing the position of the thread leading region for theoretical intersection is led out and a leading-out end is left when the braiding reaches the position, and new fiber bundles prepared in advance are added to the position of the thread adding region for theoretical intersection and a preserved end is left when the braiding reaches the position; and a step 5 of changing braiding direction to braid the second components till the braiding of the second component is finished.

The invention discloses a method for low loss welding and end face treatment of a photonic crystal optical fiber, and belongs to the technical field of photonic crystal optical fiber post-treatment. The method comprises the following steps of: cutting the photonic crystal optical fiber and another optical fiber to be welded with the photonic crystal optical fiber by using an optical fiber cutter; performing tapering treatment on the optical fiber which has a large diameter not matched with the diameter of a model field according to specific parameters of the two optical fibers so that the optical fiber is matched with the model field of the optical fiber to be welded; placing the two optical fibers of which the end faces are treated into an optical fiber welding machine and welding the two optical fibers; performing collapse treatment on one side end face of the welded photonic crystal optical fiber in accordance with the requirement through welding loss measurement and flattening the end face of the welded optical fiber at the other end by using the cutter; and grinding and polishing the two ends by using a grinder so as to obtain flat and smooth solid end faces. By the method, model field matching of butted optical fibers is realized; and the method is suitable for low loss welding among photonic crystal optical fibers as well as between the photonic crystal optical fiber and a common optical fiber.

A force measuring apparatus comprises has a force-transmitting component, that holds a strain measuring element with a carrier element and a displacement transducer. The carrier element has two fixing sections at a predefined distance from each other in a direction of the strain with which it is fixed to the component. Furthermore, the carrier element has a strain section, which is provided between the fixing sections and which has a shorter length in the direction of the strain than the distance between the fixing sections, and which has a smaller cross section than the remaining carrier element. The displacement transducer is connected to the strain section in order to register the strain of the strain section.

The invention discloses a bamboo bridge deck, which comprises prestressed ribs and a plurality of superposed bridge deck sheets, wherein the prestressed ribs penetrate through the bridge deck sheets; two ends of the prestressed ribs penetrate through shim plates and are fixed and tightened by using anchorage devices to constrain the bridge deck sheets; and each bridge deck sheet is formed by sequentially joggling a plurality of single bridge decks made of bamboo veneers end to end, and the joggled parts of the two adjacent bridge deck sheets are staggered. The required width of the bridge deck is achieved in the transverse direction by the method for sequentially joggling the single bridge decks end to end in the cross section width of a bridge. The basic single decks of the bamboo bridge deck can be conveniently prefabricated in a factory and assembled on site to form the bamboo bridge deck; the construction process is simple and fast, and the construction materials are environment-friendly and are easily reclaimed; and the bamboo bridge deck is suitable for a combined structural bridge, and is a bridge deck capable of meeting the using functions and the durability.

The invention discloses an integrally formed inductor and a manufacture process thereof, comprising a coil, two electrode pins and a magnetic solid body formed by press powder. The coil is embedded in the magnetic solid body; first end parts of the two electrode pins are embedded in the magnetic solid body with electric clearances and are electrically connected with two pins of the coil; second end parts of the two electrode pins are bent and tightly attached to the surface of the magnetic solid body; the first end part of each electrode pin is provided with two vertical clamping pieces which are integrally bent and formed; and the pins of the coil are clamped in the two vertical clamping pieces and are welded and electrically connected. By adopting the structure, the connection strength between the coil and the electrode pins is enhanced, the connection reliability between the coil and the electrode pins is ensured, thereby avoiding the quality hidden trouble and finally greatly improving the quality of products. In addition, through reasonably arranging the manufacture process of the inductor and simplifying the manufacture flow, the invention ensures that the manufacture of the inductor can be finished automatically, simply and fast, and has the remarkable characteristics of high efficiency and high quality.

The invention provides methods for preparing a transition joint of different metal materials, relates to the methods for preparing the joint of the different metal materials, and solves the problems of low reliability and poor gas tightness of the joint of different metal materials by adopting the prior connecting method. The first method comprises the following steps: 1, grinding a metal material A; 2, deoiling and cleaning the metal material A, heating the metal material A and preserving the heat under an air condition; 3, performing hot pressing joining of the heated metal material A and a metal material B; 4, preserving the heat, and then obtaining the transition joint of the different metal materials. The second method comprises the following steps: 1, grinding the metal material A; 2, deoiling and cleaning the metal material A, heating the metal material A and preserving the heat under a vacuum or inert gas condition; 3, performing hot pressing joining of the heated metal material A and a metal material B; 4, preserving the heat and then obtaining the transition joint of the different metal materials. The transition joint of the different metal material prepared by the methods has the advantages of high connection strength, good air tightness of the joint, high working reliability and the like.

A connecting strength at a bonding site between a wiring layer 1c and a conductor 1d is enhanced by comparing a bonding strength between a wiring layer 14 provided by covering the conductor 1d on an insulating base 1a and the conductor 1d with a bonding strength between the wiring layer 1c and the insulating base 1a in an adjacency of the conductor to set the latter relatively lower.

The invention relates to a pyrazoline-type hydrogen-bond self-assembly super-molecular polymer with blue-fluorescence property. The invention adopts an oligo-polyamide strip without secondary repulsion force as a hydrogen-bond bonding part and increases the number of hydrogen-bond donors and hydrogen-bond receptors to 8 from 4 so as to greatly improve the connection strength of the polymer. In addition, a pyrazoline derivative is introduced in a super-molecular polymer monomer as a blue-fluorescence unit to obtain a super-molecular blue-fluorescence polymer with a higher fluorescence quantum yield. The obtained six novel super-molecular polymer blue-fluorescence materials can emit pure-blue fluorescence in a solution state and have emission wavelengths of 440-455nm, semi-peak widths of 61-70nm and better color purity and can emit pure-blue fluorescence in a solid state and have emission wavelengths of 451-474nm, semi-peak widths of 71-79nm and better color purity.

The invention provides a liftable rack and refrigeration equipment. The liftable rack comprises a rack body and a liftable mechanism which comprises a drive mechanism and a guide mechanism, wherein the drive mechanism and the guide mechanism are connected to the rear end of the rack body; the drive mechanism is used to drive the rack body to move linearly up and down along the guide mechanism; andconnection parts between the drive mechanism and the guide mechanism and the rack body are located along the width direction of the refrigeration equipment. The liftable rack is characterized in thatthe drive mechanism and the guide mechanism are configured along the width direction of the refrigeration equipment; two pivots are formed at the connection parts between the drive mechanism and theguide mechanism and the rack body; and the two pivots are configured along a left-right direction of the rack body, so the two pivots are limited by each other, and rotation of the rack body along a rotation axis which extends along the front-back direction of the rack body relative to the liftable mechanism is effectively prevented. In this way, left-right inclination of the rack body is prevented based on principles of mechanical limiting and thus stability of ascending and descending motion of the rack body is enhanced.

A tapered type connector for a flexible tube, comprising: a) a coupling body having an external threaded portion and a stranded portion at one side thereof, an annular cavity being formed in the external threaded portion such that the stranded portion is extended into the annular cavity, the defining wall of the annular cavity being tapered inward to form a first external fastening cone, the end portion of the flexible tube fitting over the stranded portion; b) a clamp ring having at the internal end thereof a fist internal fastening cone facing to the first external fastening cone of the coupling body and at the external end thereof a second internal fastening cone, a clamp indentation being formed axially in the clamp ring, the clamp ring slipping over the periphery of the outer end of the flexible tube; and c) a clamp nut having an internal threaded portion (corresponding to the external threaded portion of the coupling body) and a second external fastening cone (corresponding to the second internal fastening cone of the clamp ring). The clamp nut includes an opening at the external end thereof. In this way, the connection strength tends to be enhanced to solve the problem of poor connection strength of the conventional connector.

The invention provides a pilot valve and a four-way valve. The pilot valve comprises a guide tube, a filter, an end cover and a capillary tube; the filter comprises a cap-shaped filter screen, one end of the capillary tube is provided with a filter containing portion in which the filter is contained, and the diameter of the filter containing portion is larger than that of a body of the capillary tube; the edge of the end cover is fixedly connected with one end of the guide tube, the end cover is provided with a supporting portion used for retaining the filter, and the filter containing portion is matched with the supporting portion which is provided with an overflowing hole enabling refrigerant to pass through. Since one end of the capillary tube is provided with the filter containing portion in which the filter is contained, the end cover is provided with the supporting portion used for retaining the filter, and the filter containing portion is matched with the supporting portion, connection strength of the filter and the end cover can be improved; the filter is small in size, so that production cost can be reduced.

The invention provides a method for preparing a CuW/Cu/CuCrZr integrated contact through electron beam welding and belongs to the field of production and manufacturing of high-voltage switch electrical contacts. One side of the electrical contact is made of a base material CuW/Cu, and the other side of the electrical contact is made of a base material CuCrZr. The method comprises the following steps that 1, the base material CuW/Cu on one side of the electrical contact is manufactured in a connection mode through a sintering method; and 2, the CuW/Cu subjected to sintering treatment and the CuCrZr are subjected to direct electron beam welding, a welding surface is made of Cu and the CuCrZr, a welded joint is a square butt joint, the joint gap value is zero, welding filling materials are not filled, a weld forming a 45-degree angle with the axis of the contact is adopted for electron beam welding, and thermal treatment is not needed after welding. Compared with the prior art, the high-temperature mechanical performance of chromium-copper can be improved, and the high welding strength can be achieved; moreover, it can be guaranteed that a Cu base is not annealed or softened; meanwhile, the stress of a vertical weld heat-affected zone is small, the sectioned contact cannot deform after being pulled and inserted for many times, and the contact finger force is stable.

Lead-free solder alloy. The invention involves an alloy, particularly a lead-free solder alloy. The components weight percentages of the solder alloy are: Silver 0.1%~4.0%, copper 0.1% ~ 2%, Sb 0.002% ~ 0.2% and the rest is tin. The formula of said solder alloy in the invention is reasonable, has characteristics of unleaded, low prices, excellent weldability, it can prevent lead damage the human body when welding; it can replace the solder containing lead and can the prevent the welding silver plate eroded by silver; it is suitable to wave soldering, dip-soldering and reflow soldering,etc.

To provide a liquid crystal display device conductive tape attaching structure and the like capable of improving the connecting strength without disturbing reduction in the thickness and the size and without disturbing light transmittance. The conductive tape attaching structure of the liquid crystal display device includes: a CF glass substrate where an ITO layer is provided; a polarization plate which is laminated to the CF glass substrate by sandwiching the ITO layer; and a conductive tape having one end which is sandwiched between the CF glass substrate and the polarization plate and connected to the ITO layer.

The invention discloses a vegetation ecological concrete slope protection structure and a construction method, which comprises a soil slope, one side of the soil slope is provided with a solid cage toe wall, and a slope protection net box is arranged above the soil slope, and the slope protection net box is filled with For ecological concrete, the side of the slope protection net box away from the soil slope is provided with a first installation groove, and a fixed pile is arranged in the first installation groove, and one end of the fixed pile penetrates the inner bottom of the first installation groove and extends into the soil slope. The invention has a simple structure, and the ability of the surface of the soil slope to resist the impact of rainwater is enhanced by cultivating root plants with ecological concrete in the slope protection net box. The card slot is separated, the rotating sleeve is rotated, and the first card block is connected with the first card slot to drive the rotating shaft to rotate, and the connecting rod drives the insert plate to insert the insert plate into the soil slope, so that the fixed pile is not easy to pull out, thereby strengthening the slope protection The connection strength between the cage and the soil slope.

The invention discloses a BIM-based (building information modeling based) internal cladding and external connecting beam or column. An active connector is fixed to an end of the beam or column in a sleeving manner, and/or a passive connecting structure is arranged on the side wall of the beam or column; the front end face of an active connector body is provided with an n-shaped hook, and a connecting flange is disposed at an edge of the front end face; the passive connecting structure is provided with a cladding hole in the sidewall of the beam or column or passive connector, and the cladding hole matches with the n-shaped hook. The hook is in a wedged structure or the cladding hole is in a wedged structure so that the beam and column are mounted by opposite inserting, the beam and the column extrude each other for tight attachment after sliding down under the gravitational action, and field connection is very quick without manual centralizing or added accessories for work. The beam and column positioned and compressed are connected through a flange and can be fixedly connected by using tapping screws or traversing bolts or by welding. Two supporting modes hook supporting and flange supporting are present, improving connection strength of the beam and column. The beam or column is simple in structure, very quick to construct in situ and suitable for popularization and implementation.

The invention discloses a connection method of a PE plastic pipe and a PE wire net skeleton plastic composite pipe, including the following steps of: (1) inserting the PE wire net skeleton plastic composite pipe into a PE electro thermal fusing sleeve; (2) inserting the PE plastic pipe from the other end of the PE electro thermal fusing sleeve; and (3) electrifying the electric melting core of the PE electro thermal fusing sleeve to generate hot melting so as to connect the PE plastic pipe and the PE wire net skeleton plastic composite pipe. By using the connecting method of the invention to connect pipes, the pipe units have safe connection and welding, and the connection intensity and tightness of the pipe material are increased greatly. The method also has the advantages of high practicality and easy generalization, therefore, pipe installation technology can be developed further and has wide application prospect.

The invention provides a linear multi-station device for connecting metal sheets through laser shock and a method thereof. The device is composed of a laser emission system, a control system and a deformation connecting system. The laser emission system is composed of a base, a lens support, a pulsed laser device, a mirror and an adjustable focusing lens. The control system is composed of a laser controller, a computer, a hydraulic control system, a stepping motor controller and a three-dimensional moving platform controller. The deformation connecting system is composed of an edge pressing device, a workpiece system, a combined female die, an automatic die opening and closing device, a linear multi-station unit and a three-dimensional moving platform. According to the linear multi-station device, pulsed lasers are used as an energy source, deformation connection of two or more layers of the same or dissimilar metal sheets is achieved through the combined female die, the clamping-connection degree between the metal sheets is improved, multi-point connection between the sheets is achieved through the linear multi-station unit, and the connection strength is improved. The female die is automatically opened and closed through the automatic die opening and closing device, so that the work efficiency is improved; when the female die is closed, the linear multi-station device has a self-locking function, so that the precision of deformation connection is guaranteed.

The invention discloses a combined anti-impact structure of a rotor made from a composite material, as well as a preparation device and a preparation method thereof. The combined anti-impact structure comprises a metal thin-walled cylinder, an inner-side aramid fibre wrapped layer and an outer-side aramid fibre wrapped layer which are sequentially coated and fixed from the inside to the outside, wherein resin is infiltrated on the inner-side aramid fibre wrapped layer at intervals to enable the inner-side aramid fibre wrapped layer to be of a partially hollow structure, and the resin is uniformly infiltrated on the outer-side aramid fibre wrapped layer. According to the invention, on the basis of the existing structure of a rotor made from a composite material, the resin is infiltrated on the aramid fibre layers according to a certain rule, thus the partially hollow structure is formed; and due to the structure, on the basis of furthest reducing the weight of the structure, the thickness of the rotor is increased, the advantages of high toughness and high energy absorption performance of the aramid fibre layers are kept, and the anti-impact performance of the rotor made from the composite material is enhanced. Meanwhile, the combined anti-impact structure disclosed by the invention is capable of remarkably increasing the connection strength among the inner-side metal thin wall, the aramid fibre layers, and the outer-side composite material layer of the rotor made from the composite material, and high in fibre location performance.

A fastener for mounting a panel to a supporting structure includes a fastener part having a base with an upper and lower side. A connector is adapted to engage with another fastener part projecting from the upper side of the base. The lower side of the base is adapted to be adhesively connected to a substrate and incorporating a surface configuration that promotes a mechanical connection with an adhesive. The lower side surface configuration includes a protrusion extending from the base to a crown. The protrusion includes an undercut portion configured to form a mechanical connection with the adhesive. In use adhesive fills between the protrusions and forms a mechanical connection with the undercut portions when hardened.

The invention discloses a composite middle layer for performing diffusion bonding on silicon carbide ceramics and a bonding process thereof. The composite middle layer for performing diffusion bondingon the silicon carbide ceramics is prepared from the following components in percentage by weight: 55 to 65 percent of high-purity titanium hydride powder, 20 to 25 percent of high-purity silicon powder (Si), 12 to 17 percent of high-purity graphite powder (C), and 1 to 3 percent of high-purity aluminum powder (Al). According to the composite middle layer disclosed by the invention, by utilizinga spark plasma sintering technology (SPS), a silicon carbide (SiC) joint, of which the thickness of a bonding layer is 20 micrometers to 100 micrometers, is prepared under a vacuum condition. A bonding layer material mainly consists of a titanium silicon carbide (Ti3SiC2), the silicon carbide (SiC) and titanium carbide (TiC). Through changing the proportions of the raw materials and process parameters of sintering, the highest shearing strength at a room temperature reaches 135.8MPa, and the hardness of the composite material of the bonding layer can reach 28.1GPa, exceeding the hardness of SiC base materials; and therefore, the composite middle layer disclosed by the invention has a higher practical value.

The invention relates to a high-airtightness special buttress thread pipe joint, which comprises a coupling and a pipe body, wherein the middle part of the coupling is provided with an inner step cylindrical surface; the two ends of the coupling are provided with standard buttress inner threads; wedged inner threads are formed at the back ends of the buttress inner threads; the end part of the pipe body is provided with a standard buttress outer thread; a wedged outer thread is formed at the front end of the buttress outer thread; metal sealing structures are arranged between the two end faces of the inner step cylindrical surface and the end part of the pipe body respectively, and comprise an inner sealing structure arranged on the coupling, and an outer sealing structure arranged on the pipe body; the inner sealing structure comprises an inner conical surface and an inner shoulder angle projecting outwards; and the outer sealing structure comprises an outer conical surface and an outer shoulder angle depressing inwards. The wedged threads and a non-planar shoulder sealing structure are arranged on the end parts of the standard buttress threads, so that the connection strength, sealing performance, anti-bending capability, compression load resistance and anti-toque performance of the joint are improved.

The invention relates to a laser welding method of an automobile drive axle differential housing and a driven bevel gear, which is characterized by comprising the following concrete steps: positioning and clamping the differential housing and the welding end surface of the driven bevel gear by adopting a special clamp with positioning and clamping functions; clamping the clamped assembly on a numerically-controlled rotary working table; transmitting the focused laser beams to a welding zone by adopting a light guide system of a reflective focusing structure; and carrying out coaxial positioning by utilizing He-Ne lasers. Because the differential housing is made of nodular cast iron and the driven bevel gear is made of carburizing steels, a laser filler wire welding method needs to be adopted, and a wire feeder is used for feeding specific welding wires to welding seams at the rate of 0.5m/min-9m/min. In the welding process, nitrogen gas, helium gas or argon gas are used for protecting a molten pool. The invention has the advantages of high connection strength, small heat affected zone and small deformation, can achieve the using requirement, simplifies the structure, lightens the weight and reduces the production cost.

The invention relates to the field of beauty. A 3D-printed electret micro-needle absorption-promoting facial mask comprises a 3D-printed facial mask layer, the facial mask layer contains a matrix containing skin-care active ingredients, and a micro-needle array layer covers the lower surface of the facial mask layer; the micro-needle array layer comprises a base layer for fixing micro-needles, thehollow micro-needles are fixed on the base layer at equal intervals, the hollow part of each micro-needle forms a drug delivery channel, the upper end of the drug delivery channel penetrates into thefacial mask layer, and the lower end of the drug delivery channel faces outwards; and an isolation layer covers the upper surface of the facial mask layer, and an electret layer covers the upper surface of the isolation layer. In the invention, the electret layer and the micro-needle layer are additionally arranged on the facial mask layer, so that the micro current and the electrostatic field generated by the electret can be utilized to promote the matrix to penetrate into the inner layer of the skin. In addition, the 3D-printed facial mask layer is adopted by the patent, fits the human facebetter, and can be effectively reduce the suspension of the micro-needles, so that more micro-needles can abut against the skin, and the skin-care active ingredients in the matrix can reach the skinmore uniformly.

The invention relates to the technical field of building construction matched tools, in particular to a building template strengthening device. Four fixing bases are included. A first clamping grooveand a second clamping groove are formed in the two sides in each fixing base correspondingly. Templates are clamped and connected in the first clamping grooves of the adjacent fixing bases. Fixing plates are arranged at the two ends of the reverse sides of the templates. Clamping mechanisms are arranged at the connecting positions of the interiors of the first clamping grooves and the templates. Strengthening plates are clamped and connected in the second clamping grooves of the adjacent fixing bases. Third clamping grooves and fourth clamping grooves are formed in the connecting positions ofthe interiors of the fixing bases and the second clamping grooves. Anti-disengaging mechanisms are arranged at the connected positions of the third clamping grooves, the fourth clamping grooves and the fixing bases. Installing grooves are formed in the upper ends and the lower ends of the outer portions of the reverse sides of the fixing bases. Connecting plates are clamped and connected in the installing grooves. The two ends of the connecting plates stretch out of the outer sides of the fixing bases and are connected with clamping plates in a clamped manner. The two ends, located on the outer sides of the clamping plates, of the connecting plates are provided with anti-disengaging bolts. The building template strengthening device is simple in structure, convenient to use, rapid in dismounting and mounting and high in practicability.

The invention relates to an assembled type prefabricated outer wallboard structure. The assembled type prefabricated outer wallboard structure mainly comprises a local layer outer wallboard, a lower layer outer wallboard, fixing assemblies, separated type angle steel, an L-shaped steel plate and horizontal U-shaped ribs; the lower layer outer wallboard permanent fixing assembly is arranged inside the lower layer outer wallboard and connected with the L-shaped steel plate in an anchoring mode; the outer wallboard top reserved horizontal U-shaped rib in the inner side of the top of the lower layer outer wallboard is connected with the edge beam reserved horizontal U-shaped rib in the end portion of a floor in a welding mode; the local layer outer wallboard and the lower layer outer wallboard are connected vertically through positioning pins; the local layer outer wallboard temporary fixing assembly 1 embedded in the local layer outer wallboard and the separated type angle steel are anchored; and post-filling fine aggregate concrete is poured into a defined space of the lower portion of the separated type angle steel. The assembled type prefabricated outer wallboard structure is high in mounting speed, and upper and lower prefabricated outer wallboards and a beam body are high in connection strength. The invention further provides a construction method of the assembled type prefabricated outer wallboard structure.

The invention relates to a composite solder for brazing high-nitrogen steel and a preparation method thereof. The composite solder is prepared from the effective components including Pd, Ni, Cr, nickel-plated graphene or vanadium plated graphene, Mo, Mn, Re, Si, B and Nb. In the brazing process by using the composite solder, high-nitrogen steel base metal is hardly melted, so that nitrogen is notlost. The defect of apore in the traditional welding mode is overcome, and the nitrogen almost has no loss. Moreover, as the high-nitrogen steel base metal is hardly melted, no deformation can occur,the connection strength and mechanical properties of a joint are improved to some extent, and awelded joint is well formed.