157results about How to "Improve joint performance" patented technology

A spark plug in which an ignition portion of a ground electrode formed through joining of a noble metal chip to the ground electrode has high durability, and a method of manufacturing the spark plug.

The invention relates to a gas shielded welding technological method of high strength steel, which comprises the following technological steps: (1) a gas shielded welding joint is cut with a dual-V dissymmetrical divided edge at the angle of 60 degrees and the blunted edge of 2mm; (2) welding wires with the nominal strength of 700MPa are adopted for welding and have the tensile strength of a deposited metal of Rm more than or equal to 700MPa; (3) the mixed gas-shielded welding with 20 percent of CO2 plus 80 percent of Ar and argon-rich gas is adopted and no preheating is required before the welding and no heat treatment is carried out after welding; (4) the chemical composition of the welding wires adopted by weight percentage is that: C is 0.04 to 0.12, Si is 0.40 to 0.80, Mn is 1.40 to 2.0, P is less than or equal to 0.020, S is less than or equal to 0.015, Ni is 0.40 to 1.0, Cr is 0.20 to 0.50, Ti is 0.06 to 0.20, Cu is 0.30 to 0.50, B is 0.002 to 0.0079, Als is less than or equal to 0.02. The method of the invention has good welding technological performance, simple operation, convenient application and high efficiency and energy saving, and is quite applicable to the welding of steel used in a high-strength structure in the ocean engineering.

It relates to an aluminum alloy solder with its components' mass percentage 16-20%Cu,5-8%Si,0.2-2.0%Mn,0-2%Mg, and the rest being Al. Small portion of Ti and B fine grains can be added to the solder to improve processing performance. The molten temperature of solder ranges 500-540DEG C, solder welding temperature 540-570DEG C, suitable for aluminum alloy soldering with the solids line temperature below 540DEG C. The solder can be made into different types like blocks, quick condensed strips or bars, suitable for vacuum soldering, protective solder and flame solder. The solder 6A02,2A5 alloy joint has tensile strength bigger than 100MPa, joint shearing force bigger than 80Mpa, without significant reduction of the joint strength after 200h salt fog corrosion.

For coherent fiber optic communications, the nonlinear XPolM impairment is the most important issue to realize over-100 Gbps high-speed transmissions. A method provides a way to cancel time-varying XPolM crosstalk by introducing multi-stage adaptive mechanism. In the method, a low-complexity adaptive filtering based on recursive least-squares (RLS) first tracks the time-varying crosstalk along with the per-survivor trellis-state decoding. The estimated channel and the decoded data are then used to calculate the empirical covariance, which is in turn exploited to obtain more accurate channel estimates by means of optimal-weighted least-squares. This is performed with a low-complexity processing over frequency domain with fast Fourier transform. The performance is significantly improved with turbo principle decoding, more specifically, iterative decoding and iterative estimation over a block.

A spark plug in which an ignition portion of a ground electrode formed through joining of a noble metal chip to the ground electrode has high durability, and a method of manufacturing the spark plug.

The present invention relates to a ceramic particle strengthening composite solder used for ceramic/ceramic or ceramic/metal solder. The ceramic particle strengthening composite solder consists of 90 to 99.8 percent of metal powder A and 0.2 to 10 percent of ceramic particle B according to the weight percentage; the metal powder A is formed by mixing Ag powder and Cu powder; relatively to the metal powder A, the mol rate of the Ag powder is 80 to 99.5 percent and the mol rate of the Cu powder is 0.5 to 20 percent. The ceramic particle strengthening composite solder provided by the present invention can reduce the generation of air holes in welding line, work at the high temperature of around 800 DEG C, and prolong the service life of the welding line at the high temperature and in the oxidizing atmosphere and the reducing atmosphere, thus obtaining the welding with high joint performance.

The invention relates to a high-strength and high-toughness automatic submerged arc welding wire with weathering resistance and mainly aims at overcoming disadvantages of poor atmospheric corrosion resistance, high production cost and the like of the existing submerged arc welding materials. In term of technical measures, the welding wire is made from the following chemical components by weight percent: C: 0.05-0.12, Si: 0.01-0.10, Mn: 1.50-2.1. S: not more than 0.015, P: not more than 0.020, Ni: 0.20-0.60, Cr: 0.20-0.50, Cu: 0.25-0.50, Ti: 0.05-0.16, B: 0.002-0.010, Als: 0.001-0.015, Fe and other unavoidable impurities. The welding wire is matched with a basic sintered flux for welding, a weld joint has excellent atmospheric corrosion resistance and comprehensive mechanical properties, and a deposited metal at a weld seam has tensile strength up to 560MPa and ballistic work up to 107J at -40 DEG C and up to 87J at -50 DEG C.

The invention relates to a stirring head for friction stir welding used for welding parts with different thicknesses and a welding method. A cutting accessory shaft shoulder is added on the basis of the existing stirring head, and the accessory shaft shoulder plays a role in cutting and removing the redundant material on the thicker side of connectors having different thicknesses to acquire a flat friction stir welding joint. The method is carried out on common friction stir welding equipment, a nose or tool of the equipment is not transformed at all, then the requirements on the equipment and the welding method are greatly simplified; in addition, in the welding process, a shaft shoulder of the stirring head and the two side surfaces of the part are parallel, so that the phenomena that metal of the connector is insufficiently extruded or damaged by shearing are not caused, the integrity and the reliability of the part are guaranteed; moreover, the accessory cutting shaft shoulder of the stirring head also plays an important role as for the part whose thickness suddenly changes, and the smooth welding process of the part is guaranteed.

The invention relates to a strong weather resistance cold rolling container coating plate laser welding process, solving the problems that the existing strong weather resistance cold rolling container coating plate welding precision is low, welding line moulding is poor, joint performance is poor, process is complex and production efficiency is low. The technical scheme adopts the laser welding technology, and joint structure for halving joint and angle joint is designed, a gap for escaping steam when welding coating is reserved, and the gap is convenient for realizing accurate assembly positioning, and the technological conditions of welding line protection gas and laser welding control are adopted, so as to ensure that the welded construction member has no deformation, appearance of welding line is beautiful, coating burning loss is less, welding joint performance is not lower than base metal, thus completely meeting the precision and quality requirements of container erection welding, and the process is simple and production efficiency is high.

The invention discloses a tungsten-transition layer/stainless steel hot isostatic pressing diffusion bonding method. Through the tungsten-transition layer/stainless steel hot isostatic pressing diffusion bonding method, the problems that tungsten-steel connecting parts for first-wall plasma divertors of fusion reactors are likely to form large thermal stress at interfaces and microdefects in the prior art are solved. According to the tungsten-transition layer/stainless steel hot isostatic pressing diffusion bonding method provided by the invention, pure tungsten, a transition layer and stainless steel serve as raw materials, are subjected to enveloping treatment and then are subjected to hot isostatic pressing treatment, stress relief annealing and envelop removing, and hot isostatic pressing diffusion connecting pieces can be obtained. The tungsten-transition layer/stainless steel hot isostatic pressing diffusion bonding method is simple in operation, non-defective metallurgical bonding can be realized, and the joint performance is excellent and stable.

The invention relates to a preparation process of a dual-metal engine cylinder composite material, the preparation process comprises the following steps of: firstly, acid-washing a HT250 cast iron cylinder liner and carrying out surface degreasing and derusting treatment on the HT250 cast iron cylinder liner; then dipping the HT250 cast iron cylinder liner into a prepared proportional saline solution, so that the surface of the HT250 cast iron cylinder liner is soaked in the saline solution; then drying the HT250 cast iron cylinder liner, and putting the HT250 cast iron cylinder liner in a ZL101A aluminum alloy melt body for hot immersion plating; fixing the immersion-plated HT250 cast iron cylinder liner in a mold cavity of a metal mold casting mold, casting, melting and cooling a ZL101A aluminum alloy, wherein concentration of the saline solution is 100-200g/L, the saline solution is prepared by mixing water together with potassium fluoride KF, potassium chloride KCl, sodium chloride NaCl, calcium fluoride CaF2, and calcium chloride CaC12 according to a mass ratio of 39-46:16-26:15-21:6-15:5-10. According to the preparation process, the engine cylinder composite material is obtained through treating the ZL101A aluminum alloy and HT250 cast iron by a self-prepared surfactant and implementing a dual-metal composite casting process on the ZL101A aluminum alloy and the HT250 cast iron, wherein two metal materials of the ZL101A aluminum alloy and the HT250 cast iron are not mixed and kept with original physical properties; but the ZL101A aluminum alloy and the HT250 cast iron obtain an extremely perfect combination interface, so that casting metallurgical bonding of 99.5 percent and above is achieved.

The invention discloses a thick plate submerged arc welding technology for low-temperature maritime engineering, which comprises the steps of: adopting a thick plate F550 which meets chemical compositions and weight percentage as well as classification society rules, wherein the steel carbon equivalent Ceq is less than or equal to 0.60%; selecting solder wires which meet chemical compositions andweight percentage; adopting a symmetrical double-faced X-shaped groove as a submerged arc welding groove, wherein the groove angle is 50-60 degrees, and the groove gap is 2-5mm; when the thickness ofa steel plate is less than or equal to 60mm, and the temperature is not lower than 10 DEG C, preheating to 100 DEG C for welding; and selecting the welding parameter, wherein the weld heat input quantity is less than or equal to 50kJ/cm. When the multilayer and multi-channel continuous welding technology is adopted by the invention, a welding joint is excellent in comprehensive mechanical property, and a welding line and a welding heat affected zone are good in impact toughness.

The invention discloses a method for preparing a copper-based solder. The method comprises the following steps: (1) burdening: preparing a furnace burden from copper, manganese, nickel, cobalt, silicon, a copper-ferrous intermediate alloy, a copper-boron intermediate alloy and a copper-mixed rare earth intermediate alloy serving as raw materials; (2) casting: putting the prepared furnace burden into the a corundum crucible according to the sequence of manganese, copper, nickel, cobalt, silicon, copper-boron intermediate alloy, copper-mixed rare earth intermediate alloy and copper-ferrous intermediate alloy, smelting by adopting medium-frequency induction, and cooling along with the furnace to obtain an alloy blank, wherein the smelting process is performed under the protection of argon gas; and (3) rolling: rolling the alloy blank with a cold-rolling mill to obtain the copper-based solder. The copper-based solder provided by the invention can be applied to an ODS (Oxide Dispersion Strengthened) high-temperature alloy welding joint, has high brazing process performance, heat resistance, corrosion resistance and machining process, and is low in cost.

The invention discloses a method for regulating an intermetallic compound for a dissimilar material overlap joint through laser-arc double-sided welding, relates to a method for overlapping and welding dissimilar materials, and aims to solve the technical problems that the produced intermetallic compound has hardly controlled thickness and a joint has poor mechanical property in the process of overlapping and welding the dissimilar materials. The method comprises the following steps of: prearranging brazing filler metals between overlap joints of the dissimilar materials, respectively arranging laser beams and arcs on two sides of the overlap joints and symmetrically heating and welding simultaneously, wherein the laser beams on the side of low-melting point materials are subjected to deep penetration welding, and the arcs on the side of high-melting point materials are brazed with the brazing filler metals. In the method, the laser beams are arranged on the side of the low-melting point materials to be subjected to deep penetration welding so as to be subjected to fusion welding with the brazing filler metals, and the arcs are arranged on the side of the high-melting point materials to be subjected to heat conduction welding so as to be brazed with the brazing filler metals; and the optimized interlayer reaction thickness is realized and excellent joint performance is achieved by controlling energy matching under the coaction of the laser and the arcs. The method is applied to the field of dissimilar material welding.

The invention relates to a preparation method for a flux-cored electrode. The method comprises the following steps of preparing a strip with a thickness of 0.1 to 0.5mm from silver solder containing 20 to 45 percent of silver, annealing and cleaning the strip, bending and deforming the strip to form a U-shaped strip with an upward opening by virtue of a roller, vibrating the silver solder to a conveyor belt from a funnel, conveying the silver solder to the U-shaped strip by virtue of the conveyor belt, rolling the U-shaped strip to form a flux-cored wire of an overlapped tubular structure by virtue of the roller, cleaning the surface of the flux-cored wire by virtue of a brush wheel and a brush, performing diameter reduction treatment, straightening the flux-cored wire in a low-temperature resistance heating or cold machining way, and cutting and forming the flux-cored wire, wherein the silver solder is placed in the transparent funnel, and is sufficient; the overlapped part of the flux-cored wire is 0.1 to 2mm wide. The method is simple and reasonable; a conventional soldering process is simplified, the quality of a soldered joint is improved, and the using cost of the solder is effectively lowered by over 30 percent.

This invention involves a non-eutectic structure welded joint of copper-aluminum thin wall pipe and its manufacturing method. This welded joint includes a chemical bond directly formed between the cone welding section of the copper pipe and the inner wall of the aluminum pipe, to form a columnar grain crystal with a toothed profile. The method includes providing a metal rod in a nosing end of copper pipe welded part, and installing a felder at the corresponding position of fixed electrode group. During welding, a pushing cylinder pushes the travelling electrode group with copper pipe to the aluminum pipe. At the same time a circuit is connected/powered, so the copper-aluminum combined zone is heated by electric resistance heating. The copper pipe moves to the interior of aluminum pipe continuously at the role of the pushing cylinder. The cooled metal rod is drawn out after power-down. The chemical bond directly forms in copper-aluminum joint. The weld does not have eutectic structure. The weld of copper-aluminum joint has characters of high strength and good sealability, thus this joint is appropriate for large-scale use in refrigerating industry.

The invention relates to a steel-magnesium dissimilar metal connection method in the technical fields of metallurgy, materials, machines and walking machines such as cars and railway vehicles, and belongs to the technical field of dissimilar material connection. According to the steel-magnesium dissimilar metal connection method, for the purpose of realizing steel-magnesium dissimilar metal welding, based on the reaction mechanism of Fe and Al on a fusion-soldered steel / magnesium interface, the influence rule of the interface temperature on reaction kinetics, and the properties of interface reaction products (Fe-Al intermetallic compounds), magnesium alloy welding wire components and welding parameters are optimized to promote a metallurgical reaction of the Fe and Al on the steel / magnesium interface, limit the thickness of a Fe-Al intermetallic compound layer and improve the mechanical properties and welding quality of an MIG fusion-soldered joint of steel-magnesium dissimilar metal. The process of the steel-magnesium dissimilar metal connection method comprises the steps of steel-magnesium weldment edge preparation, adoption of optimized magnesium alloy welding wires, adoption of an optimized welding technology and steel-magnesium dissimilar metal MIG fusion-soldered connection.

The invention relates to a preparation method of a fluxed core welding ring. The preparation method comprises the following steps: preparing a thin strip 0.1-0.5mm think from a silver brazing material containing 20-45% of silver, carrying out annealing treatment on the thin strip, washing the thin strip subjected to annealing treatment, curling the thin strip by using a roller so as to deform to form a U-shaped strip with an upward opening, vibrating a silver brazing agent to a conveying belt from a hopper, then conveying the silver brazing agent to the U-shaped strip through the conveying belt, rolling the U-shaped strip by the roller so as to deform to form a butted tubular structure, flattening the tubular structure by rolling to form a flat welding wire with a butted seam, cleaning the flat welding wire with a brush wheel and a hairbrush, and heating the flat welding wire through a low temperature resistor and then carrying out looping forming. The active temperature of the silver brazing agent is 550-850 DEG C; the sliver brazing agent is formed by mixing the following components in percentage by weight of the total weight of the silver brazing agent: 35-37% of boric anhydride, 21-23% of potassium fluoborate and 41-43% of fluoride; the silver brazing agent accounts for 10-25% of the total weight of the fluxed core welding ring. The preparation method disclosed by the invention is concise and reasonable, the brazing process is simplified, the quality of a brazed joint is improved and the use cost of the brazing agent can be effectively reduced.

The invention provides a heterogeneous metal laser-ultrasonic compound welding method and device. The two advanced technologies of laser welding and ultrasonic consolidation are combined, that is, heterogeneous materials to be welded are connected in an overlap mode to form a lap joint, the position to be welded is welded in a laser welding mode, and the connecting purpose is realized. Under the condition that the temperature of the joint to be welded is below 10-30% of the melting point of an upper layer base material, ultrasonic welding is conducted, and efficient connection of the joint isrealized. According to the heterogeneous metal laser-ultrasonic compound welding method and device, the problem that a brittle joint is formed during welding of heterogeneous materials through a traditional welding method is solved, the problem that only a high energy beam welding method is adopted, though massive formation of intermetallic compound can be partially restrained, the strength of thejoint is still not high is also solved, and the problem difficult to solve that ultrasonic consolidation is only adaptive to low-melting-point thin plate welding is solved.

A mechanically fastened permanent or detachable joint between two or more parts (21, 23, 25, 41), at least one of them made of a composite material, preferably carbon fibres impregnated with thermoset resin, with continuous plies from the full-composite area along the joint area (15) and including a metal reinforcement, preferably made of titanium, in the joint area (15), the joint area (15) thickness being increased in the thickness of said reinforcement plus the eventual additional composite plies laid only on the reinforced area. The metal reinforcement may consist of one or more metal foils or sheets (31) interleaved between the composite plies or one or more metal plates (33) embedded between two of the composite plies.

The invention discloses methods for producing magnesium alloy welding wires by adopting magnesium alloy foundry scraps, relating to methods for producing the magnesium alloy welding wires and aiming at solving the problems that the traditional process for producing the magnesium alloy welding wires at present has high production cost, complex process, low safety coefficient and certain pollution to the environment in a melting process due to requirement of shielding gas and addition of a covering agent. One method comprises the following steps of: (1) cleaning scraps; (2) packing; (3) heating and preserving the heat; (4) extruding to form wires, and (5) shearing; and compared with the first method, the difference in the second method is that in the step 3, the cleaned scraps are placed into an iron barrel which is placed into a heating furnace for heating, one end of the iron barrel is rapidly placed into a liner of an extrusion barrel, and the scraps are pushed to the bottom of the liner of the extrusion barrel, and in the step 4, an extruder is started so that an extrusion shaft enters the liner of the extrusion barrel to extrude a heated pressing disk and the scraps. The invention is used for producing the magnesium alloy welding wires.

The invention discloses low-temperature brazing solder for aluminum substrate materials. The solder is leadless solder; and not only the solidified structure is improved compared with needle zinc-phase tin-zinc eutectic alloy and the wettability is improved but also the solder can form joints with higher strength with aluminum substrates. The low-temperature brazing solder for the aluminum substrate materials comprises the following chemical compositions in percentage by weight: 9 to 15 percent of zinc, 0.01 to 2 percent of aluminum, 0.01 to 2 percent of silver, 1 to 3 percent of bismuth, and the balance being tin. The leadless solder alloy obtained by the proposal does not use toxic lead, has stronger antioxidation and better wettability compared with the prior Sn-Zn alloy, and is more suitable for aluminum soft soldering compared with the prior Sn-Ag-Cu solder alloy; and the joints have better performance and lower cost.

The invention relates to a Chinese medicinal compound preparation for treating fracture, which comprises the following Chinese medicine raw materials in part by weight: 8 to 12 parts of peach seed, 13 to 17 parts of safflower, 8 to 12 parts of Szechuan lovage rhizome, 8 to 12 parts of red paeony root, 8 to 12 parts of Chinese angelica, 8 to 12 parts of root of red-rooted salvia, 13 to 17 parts of fortune drynaria rhizome, 13 to 17 parts of Himalayan teasel root and 2 to 4 parts of notoginseng root (electuary). A preparation method comprises the following steps of: cleaning the nine medicinal materials, mixing in a ratio, adding water in an amount which is 4 to 7 times the total weight of the medicinal materials or 70 volume percent ethanol, decocting for two times, 80 minutes each time, mixing two-time decoction, filtering, and concentrating to obtain liquid extract of which the specific gravity is 1.18 at the temperature of 60 DEG C. The conventional preparation process is adopted. The preparation can be prepared into any one pharmaceutical formulation such as tablets, capsules, granules, oral liquid, pills and syrup. By the Chinese medicinal compound preparation prepared by the method, fracture healing time is obviously shortened, calluses grow more quickly, firmly and reliably, and the curative effect is far superior to that of the conventional Chinese medicine for treating the fracture.

An explosive welding forming method of titanium and common low alloy steel composite seal heads includes: thermal treating common low alloy steel to form a seal head base layer placed on a sand base layer, placing a seal head composite layer made of titanium on the seal head base layer, allowing a hanging plate welded to the seal head composite layer to be placed on the support plate of the seal head base layer, and allowing the seal head composite layer and the seal head base layer to have a reasonable and even mounting gap; placing a buffer layer on the inner surface of the seal head composite layer and fitting the two, placing a special-shaped explosive bag on the inner surface of the buffer layer and fitting the two, detonating a primer and high explosives to allow the bottom of the seal head composite layer to be welded to the bottom of the seal head base layer, and gradually welding the other parts of the seal head composite layer under the action of main explosive; performing conventional machining. The method has the advantages that welding of the seal head base layer and the seal head composite layer is achieved through explosive welding, no thermal influence areas exist in a combining area, good connector performance is achieved, and excellent performance can be kept without strict protection of the seal head composite layer during explosive welding.