39results about How to "Reduce defective welding rate" patented technology

The invention provides a surface treatment method for protecting superfine raw solder powder, a superfine powder solder paste prepared according to the method, and a preparation technology of the solder paste, and belongs to the technical field of welding materials. The surface treatment method comprises the following steps: a), preparing superfine raw solder powder; b), adopting an organic acid treating agent to treat oxide on the surface of superfine raw solder powder till the oxygen content of the superfine raw solder powder is lower than 150 ppm, so as to obtain a semi-finished product A;c), further treating the semi-finished product A with an anti-oxidant treating agent till a complex compound film is generated on the surface of the semi-finished product A, so as to obtain a semi-finished product B; and d), placing the semi-finished product B into a 30 to 40 DEG C oven for drying, and charging nitrogen during packing, so as to obtain the superfine solder powder. The superfine solder powder is compounded with scaling powder to form the superfine powder solder paste. According to the invention, the technical defects of more tin beads, poor wettability, narrow PCB printing interval, and high welding defective rate of the superfine powder solder paste in the prior art are overcome.

The invention belongs to the technical field of soldering, and particularly relates to a spot soldering fixture, which is used in a spot soldering process capable of avoiding pseudo soldering, false soldering and bursting, and is high in soldering efficiency. The spot soldering fixture comprises a fixture body, a cell storage area and a fuse storage area, and an avoidance hole is reserved between the cell storage area and the fuse storage area. Compared with the prior art, the spot soldering fixture has the advantages that a fuse and a metal strap can be effectively positioned, the height of a soldering pin can be adjusted, spot soldering quality can be improved, soldering reject ratio can be decreased, production efficiency can be improved, and cost can be saved. Besides, the invention further discloses the spot soldering process using the spot soldering fixture.

The invention relates to a combined lithium battery tab kneading method, which comprises the following steps: a positive conductive tab is ultrasonically kneaded to a fixed depth, and a negative conductive tab is not kneaded; the positive conductive tab subjected to ultrasonic kneading is mechanically leveled to a depth required by the process, and the negative conductive tab is not leveled; the negative conductive tab is ultrasonically kneaded to a certain depth; and the negative conductive tab subjected to ultrasonic kneading is mechanically leveled to a depth required by the process. According to the invention, the lithium battery tabs are kneaded in a combined manner through ultrasonic kneading and then mechanical leveling, so that the situation in which the end faces of the battery tabs are uneven due to the adoption of ultrasonic kneading only is avoided, the flatness of the end faces of the battery tabs is improved, and the welding reject ratio of the lithium battery tabs is reduced.

The invention discloses a lead acid battery flux. The lead acid battery flux comprises the following components by mass percent: 5 to 20% of alcohol and 50 to 80% of phosphoric acid, and the balance being water. According to the lead acid battery flux, oxides on a tap can be effectively removed, the battery has a good busbar welding effect, the battery welding quality is improved, the defective problems of false welding, wrap welding and scaling of a product are improved, the welding defect rate is effectively decreased, residues after welding are less, the phenomenon that a battery is scrapped due to the situation that the flux adheres to a polar plate and a partition plate is eliminated, raw materials are convenient to obtain and prepare, and compared with a flux which can be purchased in the market, the flux has the advantage that the production cost is relatively low.

The invention discloses solder composition and a preparing method and application thereof. The solder composition comprises first metal and second metal. The first metal is at least one of copper, nickel and manganese. The second metal is at least one of zinc, silver, copper, nickel, manganese and chrome. The first metal and the second metal are different. The solder composition does not contain at least one of silicon and phosphorus. The solder composition can be effectively used for connecting objects made of different kinds of metal, and the solder composition is especially suitable for copper-steel brazing of an air sucking pipe and an exhaust pipe of a compressor. Compared with existing silver-based solder, the solder composition is low in production cost, compared with national standard copper zinc solder, the solder composition is good in brazing permeability, high in welding intensity, good in welding filling performance and reliability and strong in corrosion resistance, base metal in an application range is strong in adaptability, and welding reject ratio and airtight leakage rate are low.

The invention discloses a copper tube connecting apparatus for connecting a copper tube with another tube to facilitate welding operation in the refrigerating device. The new apparatus will reduce the poor welding rate so that it will effectively prevent clogging of the copper tubes and leaking the refrigerant. It also has merit to easily determine a suitable heating time while the copper tubes are welding. Thus, the rate of poor welding is reduced, as well as a method for connecting copper tubes by using the tube connecting apparatus.

The invention provides a welding structure and a semiconductor part, and relates to the technical field of semiconductor equipment. The welding structure includes a cover plate and a bottom plate; thebottom plate has a first end face, grooves are arranged in the first end face, and two ends of the grooves penetrate through a side wall of the bottom plate, and the grooves and the first end face form openings; and the cover plate has a second end face, the first end face is arranged opposite to the second end face, the second end face is provided with bulges, the bulges can seal the openings, and a gap between the first end face and the second end face is provided for arrangement of a solder layer, and the cover plate and the bottom plate are welded through the solder layer. When the coverplate and bottom plate are welded, the solder layer is heated, pressure towards the bottom plate is applied to the cover plate , pressure towards the cover plate is applied to the bottom plate, sincethe bulges can seal the openings, the solder layer in the gap is prevented from flowing into the grooves, the solder between the cover plate and the bottom plate is prevented from being insufficient,the probability of poor welding is reduced, the blockage of a water channel or an air passage can also be prevented, and the welding quality of the welding structure is improved.

The invention provides a PCB packaging design and welding method of a TQFP chip. The PCB packaging design and welding method comprises the steps of dividing a grounded heat conducting exposed welding plate at the bottom of the TQFP chip into a big irregular welding plate with a welding hole, and a small SMT welding plate without welding holes, and connecting the big welding plate and the small welding plate with copper foil; loading PCB pre-coating solder paste containing the TQFP chip for automatic sticking and mounting, and carrying out reflow soldering; and finally, manually repairing welding through using soldering iron, and filling the middle part of the large welding hole with tin to make up the tin leaking and insufficient solder caused by reflow soldering, so as to guarantee that the divided big welding plate and the small welding plate are reliably grounded. The welding fraction defective of the TQFP package chips, welded through the method, on a PCB, is obviously decreased, the production cost is reduced, and the product quality is improved.

The invention provides a connecting piece laser processing method based on binocular vision, and relates to the technical field of conductive connection. The method is characterized in that in the connecting process of a conductive piece, the laser power is fed back in real time according to a gray scale step point formed in a depth image by a fusion point when brazing filler metal is fused; in the filling process, the welding speed is optimized according to the gray scale of the depth image; and the speed optimization method is characterized in that the welding motion speed is determined according to the gray scale of the image, the gray scale average value is taken as a base point, the speed is slowed down when being less than the value, and the speed is increased when being larger thanthe value. According to the method, welding track and speed planning is optimized according to the depth image, and the connecting processing efficiency of the conductive piece is improved.

The invention relates to an ultrasonic control circuit triggered by position and pressure and a welding method. The ultrasonic control circuit includes a sensing detection circuit body, a sampling circuit body, a main control circuit body, an interface circuit body, a driving circuit body and a power supply, wherein the sensing detection circuit body is electrically connected with the sampling circuit body; the sampling circuit body, the interface circuit body and the driving circuit body are respectively electrically connected with the main control circuit body; and the driving circuit body is electrically connected with an ultrasonic generator. According to the ultrasonic control circuit, the displacement signal of the vibration group of the ultrasonic generator and the pressure signal between an ultrasonic welding head and a product to be welded are collected; the vibration is controlled to a preset amplitude before the ultrasonic welding head is in contact with the product to be welded; time is kept after the ultrasonic welding head is in contact with the product to be welded; the problem that in the welding process, the time occupied by the vibration of the ultrasonic weldinghead to a preset amplitude results in insufficient welding time or the waste of welding energy is avoided; the welding time or the welding energy is accurately controlled; the welding defect rate is greatly reduced; and the consistency of welding products is ensured.

An air conditioner and a method of manufacturing the same are disclosed. The air conditioner includes an indoor heat exchanger and an outdoor heat exchanger, each including a plurality of refrigerant pipes and at least one connection pipe for interconnecting the refrigerant pipes, a welding hole formed in the connection pipe by punching, and a welding ring mounted over the welding hole, wherein portions of the refrigerant pipes are inserted into the connection pipe through inlet ends of the connection pipe, the welding hole is located between ends of the refrigerant pipes and the inlet ends of the connection pipe, and the connection pipe is bonded to the refrigerant pipes by heating at least one selected from between the refrigerant pipes and the welding ring.

This invention discloses a shell of cores and a core using it, in which, the shell includes a drum and up-down cover plates, and the drum is one with a bottom and an aperture on the top and the bottom of which includes a through hole, a circle of convex stand set along the edge of the through hole is set on the bottom of the drum and a circle of convex stand set along the edge of the cover plate is set on the bottom cover plate of the drum. Since the heat conductivity of air is much lower than that of metal, it can stop losing of heat in laser welding effectively by setting a circle of convex stand along the edge of the through hole on the bottom and a convex stand on the bottom cover plate so as to deepen the depth of fusion under definite laser strength.

This invention discloses a core shell including a drum and up and down cover plates, in which, said drum is a drum with bottom and an aperture at the top, the bottom is set with a through hole characterizing that a convex stand is set along the edge of the down cover plate and a convex stand is also set along the edge of the through hole on the bottom of the drum. This invention also discloses a core using the shell. Since the heat conductivity of air is much lower than that of metal, it can stop losing of heat in laser welding effectively by setting a circle of convex stand along the edge of the through hole on the bottom and a convex stand on the bottom cover plate so as to deepen the depth of fusion under definite laser strength.

A chuck plate of a chuck structure is placed on a heating plate, supports a wafer on the upper surface thereof, transfers, to the wafer, heat generated by the heating plate such that the wafer is heated, and can have: vacuum holes penetrating the top and the bottom thereof in order to adsorb the wafer by vacuum force; and a vacuum groove, which is provided on the lower surface thereof such that the chuck plate is vacuum-adsorbed to the heating plate, and forms a space by being limited by the upper surface of the heating plate.

The invention discloses a clamping device for LED display screen box body welding. The clamping device comprises a tool flat plate table, a first portal frame, a second portal frame, clamping mechanisms and pushing mechanisms; the first portal frame and the second portal frame are arranged on the tool flat plate table in parallel; the bottom of the first portal frame and the bottom of the second portal frame are both glidingly connected to the tool flat plate table; the clamping mechanisms are evenly distributed on the first portal frame and the second portal frame; the pushing mechanisms are arranged on the inner sides of stand columns and cross beams of the first portal frame and the second portal frame correspondingly; the clamping mechanisms are used for firmly and stably clamping to-be-welded box bodies; and the pushing mechanisms are used for tightly pushing the to-be-welded box bodies to prevent the to-be-welded box bodies from moving. According to the clamping device, welding position deviation caused by clamping can be effectively avoided, clamping is stable, the welding efficiency is high, the welding quality is firm, the welding reject ratio is greatly reduced, the production benefit is effectively improved, and the good market application value is achieved.

A manufacturing process of high definition digital interface includes assembling wire rubber plug, rubber plug in stab mode, medium rubber plug and automatic welding unit on said digital interface; pressing each core wire into grooves of wire rubber plug and rubber plug in stab mode, brushing tin solder on core wires and clamping them on automatic welder for carrying out automatic welding, shining light on core wire and terminal wiring end by welder to weld core wire on terminal wiring end by melting tin solder with heating for finalizing said welding at only one time.

The invention discloses a shell used for a compressor and the compressor. The shell used for the compressor comprises a shell body and a shell cover, the exhaust pipe assembly is fixed to the shell body and comprises a first pipe part and a second pipe part, the first pipe part is fixed to the shell body in a welded mode, the first pipe part is provided with an outer section part extending out of the shell body, the outer section part is fixed to the second pipe part in a welded mode, and the first pipe part and the shell body are made of iron. And the material of the second pipe part comprises copper. Therefore, the outer section part and the second pipe part are welded and fixed, and the outer section part and the shell body can be welded by adopting an electric resistance welding process, so that the production efficiency of the compressor can be improved, the welding reject ratio can be reduced, the use of brazing silver solder can be reduced, the production cost of the compressor can be reduced, and the production efficiency of the compressor can be improved. And the first pipe part is made of iron, so that the use of copper materials can be reduced, and the production cost of the compressor can be further reduced.

The invention relates to a welding method and system for an electrode plate of a surge protector. The welding method provided by the invention comprises the steps that the surge protector to be weldedis provided, wherein the surge protector comprises a housing, a sliding block and the electrode plate, the sliding block is arranged between the housing and the electrode plate, the electrode plate comprises a welding end, and a bonding pad area used for welding the electrode plate is arranged on the housing; solder paste is injected into the bonding pad area, the welding end is attached to the solder paste, and a first workpiece is obtained; the first workpiece is obtained, the distance between the welding end and the bonding pad area is adjusted and fixed, the thickness of the solder pasteis smaller than or equal to the distance between the sliding block and the bonding pad area, the space between the welding end and the bonding pad area is filled with the solder paste, part of the solder paste is extruded to the edge of the outer side of the welding end, and a second workpiece is obtained; and the second workpiece is obtained, and reflow soldering is conducted. On the premise thatthe safety protection effect of the surge protector is not affected, qualified welding spots are obtained, the welding reject ratio is decreased, and the welding method and system are suitable for mass production of the surge protector with excellent and stable performance.

The invention discloses a battery cell and cover plate assembly structure and assembly method thereof. The battery cell and cover plate assembly structure includes two bare cells and a cover plate structure, a positive electrode claw structure comprises a connecting piece and positive electrode claws, The positive electrode claw comprises a connecting piece and two positive electrode claws I arranged in parallel, a positive electrode claws I are arranged perpendicularly to a connecting piece I, a connecting part is connected to the connecting piece I, a negative electrode claw structure comprises a connecting piece II and negative electrode claws, the negative electrode claws comprises a connecting part II and two negative electrode claws I arranged in parallel, and the two bare cells arearranged side by side; The battery cell and cover plate assembly method comprises the following steps: 1) passing the positive electrode pillar through the positive electrode claw structure, lower plastic, and top cover in sequence and is connected with the positive electrode conductive block; 2) obtaining a battery cell and the cover plate preassembled structure; 3) bending the two positive electrode claws I and two negative electrode claws I respectively. The invention has the advantage that when the square battery is subjected to a squeezing test, a diaphragm is not scratched.

The invention discloses wave-soldering nitrogen protection equipment applied to soldering equipment. The wave-soldering nitrogen protection equipment comprises a soldering wave main body and a microporous pipe for introducing nitrogen. The microporous pipe is connected with a gas flow control panel through a nitrogen input pipeline. The microporous pipe is arranged on the lower portion of a soldering wave. The oxidization prevention effect is improved; and the microporous pipe is provided with honeycomb-like interstitial holes, and the nitrogen consumption is effectively reduced.