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

The invention provides a diversified heating method for a vacuum diffusion brazing furnace and belongs to the technical field of brazing. The diversified heating method for the vacuum diffusion brazing furnace adopts ternary heating modes: resistance heating, induction heating and furnace body temperature control. In the induction heating mode, an induction coil is adopted to heat. In the furnace body temperature control mode, a heating element in the furnace body is used to heat, so that beneficial effects are obtained. By performing heating treatment by adopting the brazing furnace, the heat conductivity is high, heat is quickly diffused, the heating speed can be remarkably improved, and the heat conductive efficiency is improved. Meanwhile, after annealing / diffusing, the performance index of a heated workpiece is higher.

The invention discloses an automatic brazing equipment for copper pipes and joints and a control method thereof. Welding machine; the copper tube delivery mechanism is used to deliver the copper tube to each station; the copper tube positioning mechanism includes a positioning plate and a pressing device for positioning and pressing the copper tube; the joint feeding and assembly The mechanism is used to grab the joint and put the joint on the end of the copper pipe; the socket detection mechanism is used to detect the socket effect of the sleeve joint operation; the high-frequency brazing machine is installed on the brazing machine sliding platform The outer side of the copper tube positioning mechanism is located at the brazing station. The invention can realize a series of operation processes such as automatic feeding and positioning of copper pipes, automatic grasping of joints, detection of sockets and defective sockets, and automatic brazing after that, so as to ensure the welding of copper pipes and joints during the automatic brazing process quality and easy operation.

The invention discloses a frame-type cold plate and a processing method thereof. Water channels with optimized connection sequence and shape are arranged on the groove base plate of the frame-type cold plate. When processing the cold plate, the following sequence is adopted: groove base plate, flat base plate and frame Separate processing—cleaning of groove substrate and flat substrate—assembly of groove substrate and flat substrate—vacuum brazing of groove substrate and flat substrate to form cold plate substrate—heat treatment of cold plate substrate—levelling of cold plate substrate—cold plate substrate and Frame Friction Stir Welding - Machining - Airtightness - Anodizing - Cleaning - Submission. The invention improves the heat exchange efficiency of the cold plate, reduces the processing cycle of directly processing the thick plate into a frame, reduces the waste of raw materials at the same time, reduces the thickness of the cold plate blank, and increases the furnace loading capacity of vacuum brazing to achieve The purpose of saving energy and reducing consumption.

The invention discloses a mounting method for a multi-connected type air conditioning system, and relates to the technical field of air conditioning equipment mounting. The mounting method comprises the following steps: step I, mounting an indoor unit; step II, hoisting a secondary refrigerant tube; step III, hoisting a primary refrigerant tube; step IV, welding branch tubes: connecting related refrigerant tubes of each indoor unit to the branch tubes for connecting refrigerant tubes by braze-welding, connecting the primary refrigerant tube to a gas bottle in a sealing mode, and continuously introducing low-pressure nitrogen gas; step V, cleaning pipelines; step VI, mounting an outdoor unit; step VII, detecting and charging a refrigerant; and step VIII, operating, checking and accepting. All secondary refrigerant tubes of the indoor unit are firstly hoisted, the primary refrigerant tube is then hoisted, the primary refrigerant tube is braze-welded, and the related refrigerant tubes andthe connecting refrigerant tubes are finally braze-welded, so that low-pressure nitrogen gas can be continuously introduced in through the primary refrigerant tube, repeated stop and recovery are notneeded, welding efficiency is improved, and cleaning for inner parts of the pipelines is further guaranteed.

The invention relates to a vacuum brazing and heat treatment integrated process of aluminium alloy gas circuit board. The specific process parameters are that the aluminium alloy gas circuit board is heated to 400 DEG C, heating is conducted for 35-40 min, thermal insulation is conducted for 60-80 min, and the vacuum degree is larger than 8.0*10-2 Pa; the aluminium alloy gas circuit board is heated to 530 DEG C, heating is conducted for 15-20 min, thermal insulation is conducted for 60-80 min, and the vacuum degree is larger than 8.0*10-3 Pa; the aluminium alloy gas circuit board is heated to 565 DEG C, heating is conducted for 10-15 min, thermal insulation is conducted for 60-80 min, and the vacuum degree is larger than 4.5*10-3 Pa; the aluminium alloy gas circuit is heated to 610 DEG C, heating is conducted for 10 min, thermal insulation is conducted for 10-20 min, and the vacuum degree is larger than 3.0*10-3 Pa; the aluminium alloy gas circuit board is cooled to 605 DEG C, cooling is conducted for 5 min, thermal insulation is conducted for 10-15 min, outage and cooling are contacted until the temperature is 540 DEG C, and the aluminium alloy gas circuit board is put out of a furnace and is subjected to wind quenching to be cooled to be at the room temperature. The vacuum brazing and heat treatment integrated process of the aluminium alloy gas circuit board has the advantages that the production process is simple, the cycle is short, the consumed energy is little, the production percent of pass is high, and the production cost is low. The percent of pass of the welding joint of the aluminium alloy gas circuit part is improved to 90% from the original 40%, and a good effect is achieved.

The invention belongs to the technical field of welding, and relates to a surface metallizing and brazing method of a high-volume-fraction SiCp / Al composite. Through a reasonable process, a Ni-P-SiC composite coating is obtained, by adding SiC particles into the coating, the thermal expansion coefficient difference between a substrate and the coating can be effectively reduced, the binding force of the coating can be properly improved, and in addition, compared with the mode that nickel plating is only conducted on the upper surface of the SiCp / Al composite for welding, the brazing strength can be improved to a certain degree by adding the SiC particles into the coating. Low-melting glass brazing alloy (namely SnO-ZnO-P2O5 glass brazing alloy) and SiC ceramic have good wettability, the requirement for oxygen partial pressure of the welding condition is low when glass is used as brazing alloy, the brazing efficiency can be effectively improved, the cost is reduced, and thus, by combing surface metallizing with the brazing process, good brazing joints can be obtained and can meet the requirement for application in the electronic packaging field.

The invention relates to a low-voidage vacuum brazing chip mounting technique free of loads. The technique comprises the following steps that (1), a sputtering Au technology is adopted in the back face of a chip to be brazed, and the back face is metallized; (2), the chip to be brazed is arranged on a to-be-brazed gold plating chip mounting area of an integrated circuit packaging shell, and brazing materials are placed between the chip to be brazed and the to-be-brazed gold plating chip mounting area; (3), a test sample to be brazed is placed in brazing equipment to be brazed according to technological conditions specially designed. In the brazing process, temperature curve optimization is combined with vacuum degree control, the air pressure difference is used for replacing the pressing block loads, optimization design is carried out on the temperature interval, the heating rate, the heat preservation time and the vacuum degree, the optimal technological conditions are determined, the problem that the chip is damaged due to adopted loads in the traditional method is solved, the brazing voidage is lowered, and the brazing yield and brazing quality are obviously improved.

The invention discloses a nickel-based flux-cored solder, which comprises a flux core and a nickel-based alloy wrapping the flux core; the nickel-based alloy is a nickel-chromium alloy; and the flux core accounts for 30% of the total mass of the nickel-based flux-cored solder to 40%, the drug core comprises in terms of mass fraction: 13% to 24% NiSi 2 Powder, 19% to 33% GdF 3 powder, brazing flux powder is the balance; the invention also discloses the preparation method of the nickel-based cored solder and the brazing applied to ceramics and superalloys in the atmospheric environment; the invention has its own flux, which can be realized during brazing The automatic and synergistic addition of the brazing flux is achieved. In addition, the invention has good processing performance, reduces the brazing temperature during the application process, and improves the strength of the brazing joint.