59results about How to "Improve brazing efficiency" patented technology

The invention discloses low-temperature nickel-based solder for soldering. The nickel-based solder based on a NiCrSiP system comprises the following components by weight percentage: 21.5%-28% of Cr, 2.0%-3.5% of Si, 7.0%-9.0% of P and 59.5%-69.5% of Ni. The solder of the invention is superior to BNi-5 solder in both high-temperature strength and corrosion resistance, and the nickel-based solder is applicable to both the vacuum-soldering method and the method for soldering in a continuous soldering furnace under the protective atmosphere (such as nitrogen and ammonia decomposition atmosphere) and particularly suitable for soldering the metal carriers (stainless steel materials) in the automobile exhaust purifiers and automobile EGR (exhaust gas recirculation) system, thus absolutely substituting the existing BNi-5 solder.

The invention relates to a welding fixture which comprises an upper pressure plate and a lower pressure plate, wherein the upper pressure plate and the lower pressure plate comprise central positioning holes which are arranged coaxially, the lower pressure plate is provided with a tooth block positioning hole, a tooth block mounting groove is arranged on the lower surface of the lower pressure plate and the welding fixture is characterized in that a tooth block positioning screw rod and a tooth block pressure spring are mounted between the upper pressure plate and the lower pressure plate. The welding fixture is simple in structure and can always keep the fastening connection between a tooth block and the welding surface of a basal body by high-temperature welding and avoid the phenomena of looseness and poor welding.

The invention relates to a wear-resistance medicine core composition, a wear-resistance welding wire and a preparation method and application thereof. The wear-resistance medicine core composition comprises a wear-resistance material and the balance of a filling material; the wear-resistance material is 0.6-10 wt.% of the wear-resistance medicine core composition; the wear-resistance material comprises diamond particles; the filling material comprises transition metal oxide powder and nickel base alloy powder; and the transition metal oxide powder is 12-65 wt.% of the filling material. The wear-resistance medicine core composition uses the diamond particles as wear-resistance filling materials to form wear-resistance coating layers during welding or braze coating; and transition metal oxides are used as the filling material, so that the heat loss of diamond is reduced, the brazing activity is improved, and meanwhile, the linear expansion coefficient of clad metal is reduced.

The invention relates to an automatic flame brazing welding machine of a rotary disc type four-way valve. The automatic flame brazing welding machine comprises a working platform, a brazing welding fixture working table, an automatic wire feed controller, a brazing welding automatic heater, an electrical control box, an intelligent gas control box and brazing welding fixtures. The brazing welding fixture working table is installed on the working platform. A workpiece detecting sensor is arranged on the brazing welding fixture working table. The automatic feed controller and the brazing welding automatic heater are installed on the tabletop of the working platform and placed around the brazing welding fixture working table. The electrical control box and the intelligent gas control box are installed on the edge of the working platform. The brazing welding fixture working table is in a disc shape. The tabletop of the brazing welding fixture working table and the tabletop of the working platform are parallel. The brazing welding fixture working table can freely rotate around the axis. The four brazing welding fixtures are evenly distributed on the brazing welding fixture working table. The automatic wire feed controller, the brazing welding automatic heater and the workpiece detecting sensor are all electrically connected with the electrical control box. The intelligent gas control box is electrically connected with the brazing welding automatic heater.

The invention discloses a brazing filler metal for the braze welding of titanium and titanium alloy, which contains 22 to 32 percent by weight of Ni, 1 to 1.5 percent by weight of Al, 0.5 to 1.0 percent by weight of Mn, 0.3 to 0.6 percent by weight of V, 0.6 to 1.0 percent by weight of Sn, 1.5 to 2 percent by weight of Zr and the balance of Cu. The preparation method for the brazing filler metal includes the following steps: weighing the materials, casting the smelted materials to form a brazing filler metal ingot, and then extruding and rolling the brazing filler metal ingot into a braze welding foil. An argon-shielded condenser discharge resistance heating method is adopted to weld titanium with the brazing filler metal. The brazing filler metal does not contain precious metals, i.e. palladium and silver, and thereby the manufacturing cost can be greatly reduced; the processability of the brazing filler metal is good, the inter-annealing processing rate is high, a foil strip which is 0.1mm can be rolled, and the rate of finished products is 80 to 85 percent. Meanwhile, the preparation method is simple, the strength of a braze-welded titanium joint is high, the braze-welding timeis short, the metallic texture of the titanium alloy matrix cannot be changed, and in particular, the invention is suitable for the braze welding of titanium alloy parts of small specifications in large batches.

The invention discloses a halogen-free pickling flux, which comprises the following components in parts by weight: trimethyl borate 50 60 part, methanol 30 parts 40 part, water 10 part 20 part, sodium tetraborate 1 5 part, boric acid 1 3 copies. In the halogen-free pickling flux of the invention, the addition of trimethyl borate protects the workpiece from oxidation, the trimethyl borate is hydrolyzed to generate boric acid through the addition of water, the generated boric acid and sodium tetraborate form a traditional eutectic compound combination of the flux, the melting point is further reduced by the addition of sodium tetraborate, and the activity of the flux is improved. Especially, the addition of halogen is insulated, so that the surface of the brazed workpiece will not be oxidized and blackened, and corrosion and penetrating porosity are not easy to occur, and the brazing activity is high, so that the brazing efficiency is higher.

The invention relates to a high-strength aluminum alloy composite plate for a surface plate of a brazing honeycomb plate, a core material, wrapping layers and a surface material. The high-strength aluminum alloy composite plate comprises the surface material, a first wrapping layer, the core material and a second wrapping layer, which are overlapped in sequence, wherein the thickness of the composite plate is 0.5-2.5 mm; the surface material is a 4-series aluminum alloy; the mass content of Si is 4.5-11%; the first wrapping layer and the second wrapping layer are both made of a 1050 aluminum alloy with an Si element; the mass content of Si is 0.7-0.9%; the core material is a 6-series aluminum alloy; and the solidus temperature of the core material is higher than or equal to 580 DEG C. Due to adoption of the high-strength aluminum alloy composite plate for gas carrier brazing, the core material, the wrapping layer and the surface material, the strength can be maintained when the weight of the composite plate can be reduced, in addition, the surface plate of an Mg-containing aluminum honeycomb plate can be applicable to gas carrier brazing, the production efficiency of brazing can be improved, and the production cost can be lowered.

The invention relates to a ceramic heating rod with a ceramic core and electrode leads and a production method of the ceramic heating rod. The production method is applied to heating of warm water ofa smart toilet, flow of a water heater, electric soldering iron and a hair curler and production of the ceramic heating rod. The ceramic heating rod with the ceramic core and the electrode leads is characterized in that a cylindrical ceramic lining core is provided with a first electrode lead cavity and a second electrode lead cavity; the first electrode lead cavity extends inwards from the end surface of the cylindrical ceramic lining core, passes through a first electrode lead weld leg cavity and then passes outside from a first connection hole in a side wall; the second electrode lead cavity extends inwards from the end surface of the cylindrical ceramic lining core, passes through a second electrode lead weld leg cavity and then passes outside from a second connection hole in the sidewall; the inner surface of the first electrode lead weld leg cavity is provided with a first electrode lead weld leg cavity conducting material sintering layer; and the inner surface of the second electrode lead weld leg cavity is provided with a second electrode lead weld leg cavity conducting material sintering layer. The ceramic heating rod has the advantages that the purposes of a first connecting plate material sintering layer and a second connecting plate material sintering layer are changed, and the tensile property and the brazing efficiency of the electrode leads are improved.

The invention discloses a cored copper welding wire suitable for small area brazing, and belongs to the field of flame brazing or induction brazing of steel structures and copper pipes. The cored copper welding wire consists of an inner core brazing flux and a homogeneous alloy brazing material coating the inner core, wherein the inner core brazing flux is a mixture of boron-containing compounds and fluoride. By virtue of characteristics of high rigidity and good stiffness of a tubular material, operability of the welding wire is improved; by virtue of a characteristic of quick heat absorption of a material with a large specific surface area, the melting speed of the brazing material is increased; by virtue of a characteristic of integration of the brazing flux and the brazing material, the operating process is simplified and the brazing construction efficiency is improved; by virtue of a characteristic of less material per unit length of a hollow material, accumulation of the brazing material is reduced and the brazing material is saved; by virtue of a characteristic of attachment of the brazing flux, the flowability of the brazing material is improved, so that phenomena of loss and waste of the brazing material are reduced and the quality of a brazing joint of a small area brazing seam is ensured.

The invention discloses a high-frequency gas protection brazing furnace and a work method thereof. The high-frequency gas protection brazing furnace comprises a furnace body, a gas protection device and a controller. The furnace body comprises a shell, a cavity, a support, a clamp, a high-frequency coil, a shielding layer and a temperature detector. The shielding layer is arranged on the inner wall of the shell, the support is arranged at the bottom of the cavity, and the clamp is arranged o the support. The high-frequency coil is wound around the surface of the cavity, and connected with the controller through a wire to form a closed loop. The gas protection device communicates with the cavity through a pipeline. The temperature detector is arranged on the surface of the clamp and connected with the controller. During work, a workpiece is firstly fixed; the controller is started, the high-frequency coil and the clamp generate electro-magnetic induction too generate heat, and the brazed workpiece is fast heated through the heat conductivity of aluminum; and then heat preservation is carried out in the furnace, then cooling is carried out, and the workpiece is taken out. The high-frequency gas protection brazing furnace has the beneficial effects of being fast in heating, saving energy, being environmentally friendly and the like.

The invention relates to a wear-resistant coating composition, a wear-resistant welding wire and a preparation method and application thereof. The wear-resistant coating composition comprises a wear-resistant material, a polymer material and a filling material, wherein the wear-resistant material accounts for 0.5wt.%-5.5wt.% of the wear-resistant coating composition, and the wear-resistant material comprises diamond particles; the polymer material accounts for 5wt.-20wt.% of the wear-resistant coating composition; and the filling material comprises transition metal oxide powders and nickel-based alloy powders, wherein the transition metal oxide accounts for 10wt.%-40wt.% of the filling material. According to the wear-resistant coating composition, the diamond is used as a wear-resistant reinforcing material, the transition metal oxide is used as the filling material; when the wear-resistant coating composition is used for welding or brazing coating, the diamond forms a wear-resistant coating; and due to the existence of the filling material, the thermal damage of the diamond is reduced, the brazing activity is improved, and meanwhile, the linear expansion coefficient of cladding metal is reduced.

The invention discloses a high-performance green brazing material which comprises a main material and an auxiliary material. The auxiliary material is 25-30 parts of a Sn-Ag-Cu lead-free material. The auxiliary material is prepared from 6-10 parts Zn, 4-6 parts of In, 6-8 parts of B, 2-4 parts of P, 3-9 parts of Ni, 5-7 parts of Mn and 7-9 parts of Co. The high-performance green brazing material completely avoids heavy metal carcinogenic elements of lead and cadmium, the brazing material is environment-friendly, and human bodies are prevented from being severely hurt; the brazing material is rich in ingredient, and the brazing performance is improved; the Zn, the In and the P are added in the formula, and therefore the effect of increasing the mobility of the brazing material in a molten state is achieved, and the brazing efficiency is high; the Co and the Ni are added in the formula, and therefore the effect of reinforcing the high strength and toughness of the brazing material is achieved; and the Mn is added in the formula, and therefore the effect of reducing the melting temperature space is achieved.

The invention provides a rhythmic vacuum purification nitrogen protection brazing furnace which comprises a brazing chamber, a guide rail and a control panel. A thermostat is arranged in the brazing chamber; an access port is formed in the side surface of the brazing chamber; a vacuum purification chamber is connected to the access port of the brazing chamber; openings are formed in two sides of the vacuum purification chamber; a first furnace door is arranged between the opening close to the brazing chamber and the access port; a second furnace door is arranged on the opening far away from the brazing chamber; a nitrogen filling pipeline is further arranged in the vacuum purification chamber; the guide rail is used for connecting the brazing chamber and the vacuum purification chamber; aconveying vehicle for conveying a product is slidably connected onto the guide rail and is connected with a drive device; the guide rail extends out of the second furnace door and forms a feeding andblanking area; an air cooling device is further arranged beside the feeding and blanking area; and the control panel is used for controlling the devices. The rhythmic vacuum purification nitrogen protection brazing furnace provided by the invention has the advantages of high brazing quality and the like.