89results about How to "Improve welding rate" patented technology

The invention discloses a collecting chamber, a production method of the collecting chamber, an automobile radiator, and a production method of the automobile radiator, which belong to the technical field of automobile radiators. The invention aims to reduce welding seams and improve one-time welded rate of a product. The invention adopts the technical scheme that the collecting chamber comprises a collecting chamber main body and block boards, wherein the collecting chamber main body is a square pipe; a plurality of collecting holes are formed in the bottom surface of the collecting chamber body; a transverse cut-through welding seam is formed in the top surface of the collecting chamber body; the block boards are sealed and fixed on two ends of the collecting chamber body; a water inlet and outlet hole is formed in the side face of the collecting chamber main body. The production method of the collecting chamber comprises the following steps of blanking, stamping to form at the first time, stamping bulges to form the collecting holes, stamping the water inlet and outlet hole, stamping to form at the second time, and fixing the block boards. The automobile radiator is provided with the collecting chamber. The production method of the automobile radiator comprises the following steps of assembling the automobile radiator into a whole, and putting into a brazing furnace for welding at one step.

The invention discloses a magnetron sputtering rotary target material binding method. The method comprises the following steps that the inner surface of a rotary target pipe is metallized by means ofan ultrasonic surface treatment mode; the outer surface of a stainless steel pipe is roughed by adopting a sand blasting treatment means, and then welding flux is brushed to the outer surface of the stainless steel pipe by adopting a steel brush; and the stainless steel pipe is erected, the rotary target pipe sleeves the exterior of the stainless steel pipe, it is guaranteed that the temperature of the rotary target pipe is constant at 180-300 DEG C, the temperature of the stainless steel pipe is controlled to be kept at 180-300 DEG C, after the temperatures of the rotary target pipe and the stainless steel pipe are consistent, molten welding flux is poured into a gap between the inner surface of the rotary target pipe and the outer surface of the stainless steel pipe, the rotary target pipe and the stainless steel pipe are cooled to the room temperature simultaneously with the cooling speed being 1-5 DEG C/min after air in the gap is exhausted, and thus, a bound rotary target materialis obtained. The method has the advantages that heating is uniform, and the yield is high.

Disclosed are a Sn-Zn-Ag-Ni alloy lead-free solder and a preparation method thereof. The Sn-Zn-Ag-Ni alloy lead-free solder is mainly applied to low-temperature soldering of pure aluminum and aluminum alloy. The Sn-Zn-Ag-Ni alloy lead-free solder is composed of, by weight percentage, 8.0-10.0% of Zn, 0.5-1.5% of Ag, 0.5-1.2% of Ni and Sn as balance. The Sn-Zn-Ag-Ni alloy lead-free solder is low in melting temperature, good in soldering technological property and high in lubricity, achieves a welding deposition rate higher than 75% and a welding line tensile strength sigma b higher than or equal to 50 MPa, and is applicable to low-temperature soldering of the pure aluminum and various aluminum alloys such as 3A21, 6063 and 6061.

The invention discloses a welding process of a superconductive cable and a box type copper connector in a large high temperature superconductive current lead. The welding process of the superconductive cable and the box type copper connector in the large high temperature superconductive current lead includes the following steps: (1) sequentially performing an armor removal process on the surface of the superconductive cable, performing a nickel removal process on the surface of the superconductive cable by using an anti-electrolysis method, and performing a silver coating brushing process on the surface of the superconductive cable; (2) performing the silver coating brushing process on a copper face on the inner surface of the box type copper connector, and then installing three layers ofSn63Pb37 tin sheets 0.1mm in thickness and 183 DEG C in melting point on the inner surface of the box type copper connector; (3) installing the superconductive cable in the box type copper connector,and then installing a box cover on the box type copper connector; and (4) applying certain force onto the box cover, inflating a box body with protective gas, and completing a tin soldering process after heating. The welding process of the superconductive cable and the box type copper connector in the large high temperature superconductive current lead reduces the plugging rate of the superconductive cable, obtains a uniform sliver coating, obtains uniform welding thickness for the superconductive cable and the box type copper connector, achieves the high welding rate and high welding strengthfor the first layer cable, and is simple to operate and the like.

The invention discloses an induction brazing temperature field control method with a selective wetting effect. The control method comprises the following steps: washing a workpiece prior to welding; coating preset solder and welding flux and assembling the workpiece at a connector welding area; putting a welding area of the workpiece to be welded at a center part of an induction ring of a high frequency induction brazing machine; clamping a copper alloy cooling clamp at one end of a base metal of which the brazing temperature needs to be reduced in a mechanical fastening mode; starting a power supply of the high frequency induction brazing machine and opening a switch of the cooling clamp clamped on the workpiece at the same time; adjusting the flow of a cooling medium and heating the workpiece to be welded for 5-60 seconds; keeping the temperature for 5-30 seconds after a brazing filler metal is melted and spread out; closing the power supply of a sensing welding machine and closing a cooling clamp circulating system after the welding; and taking out the workpiece when the workpiece is cooled. By controlling the gradient temperature fields at two ends of the base metal of the connector, the temperature of the base metal at one side with better brazing filler metal wetness is 20-50 DEG C lower than the temperature of the other side, so that the wetness difference of the brazing filler metal at the substrate of the base metal, and the welding-on rate and the performance of the connector are improved.

The invention discloses a welding method of high-purity sulfur phase change alloy target. The welding method comprises the following steps of 1, providing the high-purity sulfur phase change alloy target and a back plate; 2, carrying out surface treatment of the welding surfaces of the target and the back plate; 3, placing appropriate amount of organic welding adhesives on the welding surfaces ofthe target and the back plate; 4, contacting the welding surface of the target with the welding surface of the back plate, and applying a certain pressure for welding; and 5, cooling the welded targetto complete welding. According to the welding method of the high-purity sulfur phase change alloy target, by optimizing the surface state of the welding surfaces of the target and the back plate, thetarget and the back plate are wetted with the organic welding adhesives, so that the welding area is increased, and the welding effect is improved, that is, the welded rate is improved; and at the same time, the welding temperature and the welding pressure are controlled, so that the fluidity of the welding adhesives is controlled, the amount of the welding adhesives is reduced and the thicknessof welding seams is controlled, and therefore, the requirements of the customers for the target performance are met.

The invention designs a Fe-based multi-element active high-temperature solder for a carbon fiber reinforced ceramic matrix composite. Stainless steel with low expansion coefficients is mainly used asa master alloy, melting point depressant elements are not added, and a liquid phase is obtained by a mode of eutectic reaction between Fe and carbon fibers in the solder in soldering so that the non-metallic carbon fibers can be rapidly wetted, a melting point of the solder, the soldering temperature and the service temperature of a joint can be improved favorably, and a brittle intermetallic compound formed by the melting point depressant elements can be avoided favorably; due to the fact that the stainless steel master alloy and an added refractory element Mo both have the advantages of being small in thermal expansion coefficient and high in heat resistance, an obtained soldering seam has the advantages of small in thermal expansion coefficient, resistant in oxidation corrosion and highin heat resistance, which is beneficial to reducing the thermal stress and improving the service temperature of the joint and improving the comprehensive performance of the joint; and the solder hasthe advantages of being low in price, high in soldering temperature, fast in wetting reaction, short in soaking time and high in room-temperature/high-temperature strength of the soldered joint.

The invention discloses a composite board and a preparation method thereof. The method comprises the following steps: preparing a core material cast ingot, a filling layer alloy plate and a covering layer alloy plate; hot-rolling the composite core material cast ingot and the filling layer alloy plate to obtain an alloy coiled material; and cold-rolling the composite coating alloy plate and the alloy coiled material. The composite board comprises a core material, a filling layer and a covering layer which are stacked in sequence, the covering layer is prepared from the following aluminum alloycomponents in percentage by weight: 5.0 to 12.6 percent of Si, less than or equal to 0.8 percent of Fe, less than or equal to 0.25 percent of Cu, less than or equal to 0.1 percent of Mn, less than orequal to 0.1 percent of Zn, 0.05 to 0.2 percent of Bi, less than or equal to 0.1 percent of Sr, less than or equal to 0.1 percent of Eu and less than or equal to 0.1 percent of Yb; the filling layeraluminum alloy comprises the following components in percentage by weight: 7.0-15.0% of Si, less than or equal to 0.8% of Fe, less than or equal to 0.3% of Cu, less than or equal to 0.15% of Mn, lessthan or equal to 0.15% of Zn, 0.05-0.5% of Mg, 0.05-0.2% of Bi, less than or equal to 0.1% of Sr and less than or equal to 0.1% of Gd; the core material is one of series 1, series 3, series 5, series6, and series 7 aluminum alloys. The composite board is used as a soldering flux-free brazing material for the finned tube in the automobile condenser, and the welding rate reaches up to 95% or above.

The prepared material is composed of a core material and a skin material, and the core material alloy is prepared from 0.7 wt%-1.0 wt% of Si, 0.3 wt%-0.6 wt% of Fe, 1.3 wt%-1.8 wt% of Mn, 1.3 wt%-1.6wt% of Zn, 0.1 wt%-0.2 wt% of Zr and the balance aluminum and inevitable impurity elements; the skin material alloy comprises, by weight, 6.8%-7.8% of Si and the balance aluminum and inevitable impurity elements. According to the chemical components, a composite aluminum strip obtained through the procedures of fusion casting, saw cutting, surface milling, compounding, heating, hot rolling, cold rolling, annealing, tension leveling and slitting has the forming performance, the strength and corrosion resistance after brazing are superior to those of a composite aluminum strip material with 3003as the core material, and the use requirement of fins for brazing of a power station cooling system is met.

The invention discloses a pre-treatment improving target material binding method which comprises the following steps: a, a step before pre-treatment; b, a step of pre-treatment of a back tube; c, a step of pre-treatment of a metal target tube; and d, a binding step. According to the pre-treatment improving target material binding method provided by the invention, the pre-treatment effect before binding a rotary target is improved effectively, and the binding quality of the rotary target is improved.

The invention provides cadmium-free silver-based brazing filler metal which is prepared from, by weight, 28-38% of Ag, 20-30% of Zn, 1-3% of Mg, 2-4% of Sn, 0.6-1.3% of Ni, 0.04-0.16% of NaF, 0.3-1.2% of P and the balance Cu. The cadmium-free silver-based brazing filler metal is low in silver content, contains no cadmium element, is low in melting temperature, high in corrosion resistance and good in machining performance, is the multi-element silver brazing filler metal and is used for brazing red copper, brass and stainless steel.

The invention discloses a copper-molybdenum electrode welding method. An copper-molybdenum electrode is formed through welding of a copper-molybdenum head and a copper seat, wherein the copper-molybdenum head is made of copper-molybdenum material; and the copper seat is made of pure copper or copper alloy. The copper-molybdenum electrode welding method comprises the following steps: cleaning a to-be-welded surface; smearing brazing flux on the to-be-welded surface, and then carrying out butt joint and clamping to enable the to-be-welded surface to be horizontal; smearing a stop-off agent in the welding line on the periphery of the to-be-welded surface to separate the welding line into an air exhausting area accounting for 25%-40% and a brazing filler metal adding area accounting for 15%-30%; enabling the welding line positions of the brazing filler metal adding area and the air exhausting area to be opposite; mounting a to-be-welded piece and a clamp into high-frequency induction heating equipment; placing a proper amount of brazing filler metal in the brazing filler metal adding area; quickly heating to fuse the brazing filler metal; adjusting induced current for heat preservation; shutting down the heating equipment until fused brazing filler metal on the entire air exhausting area; and cooling to obtain the copper-molybdenum electrode. According to the copper-molybdenum electrode welding method, the stop-off agent restrains fused brazing filler metal to flow in the welding line on the periphery; the fused brazing filler metal flows in the brazing filler metal adding areaand flows out of the air exhausting area to squeeze the air in the gap out, so that the problem about discharging of the air in the gap when a large-specification copper-molybdenum electrode is brazed is solved; and the brazing rate is remarkably increased to be 80% or above.

The invention relates to pure aluminum surface treatment methods, in particular to a pure aluminum surface treatment method for aluminum/nickel diffusion bonding. According to the pure aluminum surface treatment method, a pure aluminum base material surface treatment method is a mechanical vibration treatment method, small stainless steel balls bonded with nickel powder constantly collide with a pure aluminum base material subjected to softening annealing treatment, and crushing of oxide films on pure aluminum surfaces is facilitated; cold welding is constantly conducted through energy rise caused by collision between the nickel powder and the pure aluminum base material, and part of nickel is inlaid in the pure aluminum base material; and finally, a coating nonuniform in thickness can be formed, so that the surface treatment effect is achieved. According to the method, diffusion bonding is conducted on the pure aluminum base material subjected to mechanical vibration surface treatment and the nickel, the oxide films on the aluminum surfaces are crushed more easily, and nickel-and-nickel bonding occurs, so that atomic diffusion is more sufficient, the number of gaps is smaller, the welding rate is increased significantly, and bonding quality is improved remarkably.