493results about How to "Improve welding quality" patented technology

The application discloses a butt joint device for pipeline welding and belongs to the technical field of pipeline welding, which comprises a holding mechanism and a butt joint mechanism. The holding mechanism comprises two holding arc plates which are hingedly connected, and arc-shaped insertion grooves are formed in the holding arc plates. The butt joint mechanism comprises two butt joint outer plates which are hingedly connected, and a butt joint inner plate which is movably inserted into the butt joint outer plates and is slidably matched with the arc-shaped insertion grooves. Welding ports are formed in the butt joint outer plates in a penetrating manner. In the scheme, the holding mechanism and the butt joint mechanism are connected, so that the pipelines on both sides can be centrally positioned, the operation of assisting in the central positioning of the pipelines by additional workers is avoided, the central positioning error can be greatly reduced, the conditions such as incomplete welding and large butt joint ports in the pipeline welding are prevented, and the welding quality is improved. One person can operate the butt joint device, the labor cost and a large amount of time are saved, the construction efficiency is remarkably improved, the construction period is reduced, and the butt joint device has great popularization and application values.

The utility model belongs to welding processing technical field especially relates to a kind of welding wire conveying tool, comprising: base frame, base frame is in and is equipped with storage groove;Conveying component, including first roller and second roller, first roller and second roller are rotatably set in storage groove;Driving assembly, installation is in base frame, for driving first roller to rotate;Wherein, the welding wire to be conveyed is wired through between first roller and second roller, and first roller and second roller are used to clamp the welding wire along the radial direction of welding wire;The beneficial effects of the utility model are that the first roller and second roller are rotated to realize the clamping of welding wire, so that the welding wire can be automatically wired to the processing end of welding robot, and the automatic welding wire conveying operation is completed;At the same time, the clamping force received by the welding wire during conveying is small, which avoids the occurrence of adverse conditions such as weld serpentine bending, inconsistent welding size and a large number of abnormal splashing, and effectively improves the welding quality.

This invention provides a brazing filler metal, a brazing filler metal preparation method, and a rectifier brazing method. The brazing filler metal includes a first brazing filler metal and a second brazing filler metal. The brazing filler metal preparation method involves uniformly mixing high-temperature alloy powder and brazing binder at a mass ratio of 2:1 to 3:1 to form the first brazing filler metal; and uniformly mixing BNi2 powder and brazing binder at a mass ratio of 10:1 to 15:1 to form the second brazing filler metal. By specifying brazing filler metals with a specific particle size ratio and applying different types of brazing filler metals in different zones, defects such as incomplete welding and porosity that are difficult to control in large-gap welds during processing and assembly are solved, improving the welding quality of welds with both large and small gaps, thereby increasing the product qualification rate.

The utility model belongs to electric welding machine equipment technical field discloses a kind of electric welding machine current remote control device, the rotation angle of current control knob is realized to the control of electric welding machine current size by control, the electric welding machine current remote control device includes remote control module, wireless communication module, controller, box, pivot, driving part, transmission rod subassembly, camera probe and display, using remote control module remote control mode, control driving part drives pivot rotation, pivot is connected with the current control knob of electric welding machine by driving subassembly, transmission rod subassembly passes on the torque of pivot to current control knob, compared with the connection mode of hose, transmission rod subassembly cannot distort storage elastic potential energy, effectively prevent the misrotation of current control knob, can ensure that the rotation ratio of pivot and current control knob is 1:1 accurate transmission, and feedback to the adjustment result by camera probe, realize the accurate adjustment of operator to current control knob rotation angle.

This utility model discloses an integrated hot-melt welding device for automotive sealing strips, relating to the field of automotive parts manufacturing technology. The device includes a worktable, support legs, an adjustment mechanism, and a quick-installation mechanism. The support legs are fixedly mounted on the bottom of the worktable, and an adjustment bracket is fixedly mounted on the top of the worktable. An adjustment mechanism for controlling the mating of the sealing strip is fixedly mounted at the bottom of the adjustment bracket, and a quick-installation mechanism for rapidly installing the mold cavity is fixedly mounted at the top of the adjustment bracket. Through the inclined engagement of the wedge block and roller, and the limiting design of the dovetail groove, a rocker arm drives the pressure plate to quickly press the mold cavity. This dual-fixing mechanism significantly shortens the mold cavity replacement and debugging time, reduces operational complexity, and enhances the installation stability of the mold cavity, adapting to the flexible production needs of multiple sealing strip models, and significantly improving the equipment's versatility and production efficiency.

The utility model discloses a positioning jig applied to laser welding of a motor end cover, which comprises a fixed base, the fixed base is provided with a casing positioning die and a positioning core rod which are coaxially arranged, the positioning core rod is embedded in a core rod mounting hole of the casing positioning die, and the upper end part of the positioning core rod extends to the upper end side of the casing positioning die; the positioning jig applied to laser welding of the motor end cover further comprises an auxiliary pressing rod which is vertically arranged, the auxiliary pressing rod is located over the positioning core rod, and the auxiliary pressing rod and the positioning core rod are coaxially arranged. The periphery of the machine shell positioning die is rotationally sleeved with a rotating disc, the upper surface of the rotating disc is provided with a positioning pin shifting mechanism and a machine shell positioning block with the position adjustable, and the positioning pin shifting mechanism is provided with an end cover positioning pin which is horizontally and transversely arranged. By means of the structural design, the welding angle adjusting device has the advantages of being novel in structural design, good in welding positioning stability and high in adaptability, and the welding angle between the motor shell and the motor end cover can be adaptively adjusted.

The utility model discloses a kind of welding tool of shell class parts top opening, the utility model relates to the technical field of shell class parts top opening welding, and the front end surface of fixed seat is fixed with support strip block;The top surface of two locating blocks is fixed with guide rod, the top of two guide rods is fixed with baffle, the top of two guide rods is slidably equipped with the float plate of liftable, spring is equipped on the two guide rods, and the upper and lower ends of spring are respectively fixed on baffle and float plate;The insert in float plate is fixed with being located in the just above support strip block;The top surface of concave piece left and right end is fixed with horizontal cylinder, and the acting end of two horizontal cylinder piston rods is fixed with side push block.The utility model has the beneficial effects that: improve the welding quality of shell class parts, greatly improve the welding efficiency of shell class parts.

The application relates to a matching welding method and system of an automobile bumper, and relates to the technical field of welding, which comprises the following steps: collecting first vibration detection information of a bumper beam clamp, second vibration detection information of an energy absorption box clamp and welding parameters of a welding device; determining first vibration offset parameters according to the first vibration detection information; determining second vibration offset parameters according to the second vibration detection information; analyzing the first vibration offset parameters and the second vibration offset parameters to determine the relative offset amount of the energy absorption box; based on the welding parameters, calling a welding current position point and a current welding power; combining the welding current position point and the relative offset amount to determine welding offset influence parameters; when and only when the welding offset influence parameters meet a preset moving reference reference value, combining the welding offset influence parameters and the current welding power to determine welding adjustment information, and outputting the welding adjustment information. The application has the effect of improving the welding quality of the energy absorption box and the bumper beam.

The invention discloses a multi-degree-of-freedom intelligent welding workstation and a working method. The workstation comprises a two-degree-of-freedom positioner, a welding robot, an argon arc welding system, a two-protection welding system and two sets of quick change systems. The quick-change system comprises a quick-change base, a quick-change stand column, a first quick-change fixed disc and a quick-change movable disc. The quick-change base is fixed on the ground; the upper end of the quick-change stand column is fixedly connected with the first quick-change fixed disc; the first quick-change fixed disc can be connected with and lock the quick-change movable disc through a first automatic locking mechanism, and a welding gun is fixed to the quick-change movable disc. Welding guns on quick-change movable discs of the two quick-change systems are an argon arc welding gun and a two-protection welding gun respectively. A second quick-change fixed disc is mounted at the tail end of the welding robot and can be connected with a locking quick-change movable disc through a second automatic locking mechanism; according to the welding robot, the two welding guns are replaced at any time through the quick-change system, welding in two welding modes at a single station of one welding robot is achieved, and cost waste caused by repeated installation is avoided.

This invention discloses a method for detecting the change in the length of a rotating arc based on the characteristics of a rotating arc sensing signal. The method includes: the working principle of the rotating arc length change detection method; the relationship between the rotating arc length change coefficient and the welding current and its change; establishing a relationship model between the rotating arc length change coefficient and the characteristic quantities of the rotating arc sensing signal; and the method for detecting the change in the length of the rotating arc. The change in the length of the rotating arc affects the stability of the rotating arc. A larger change in arc length results in poorer arc stability, while a smaller change in arc length results in better arc stability. Using the method of this invention, the change in the length of the rotating arc can be detected based on the characteristics of the rotating arc sensing signal, laying the foundation for automated machine control of the change in arc length. This enables intelligent control of robotic welding quality, improving welding quality and efficiency.

This invention discloses a PCB board soldering machine, belonging to the technical field of soldering machines. It includes a frame, a Y-axis moving assembly, an X-axis moving assembly, and a soldering mechanism. The Y-axis moving assembly is mounted on the frame and drives a vacuum suction plate holding the PCB board. The X-axis moving assembly is located on top of the frame and drives a moving frame thereon. The soldering mechanism is mounted on the frame and used to solder components on the PCB board. The independent X and Y-axis moving assemblies of this invention precisely drive the longitudinal movement of the PCB along the Y-axis and drive the lateral movement of the soldering mechanism along the X-axis, achieving high-precision planar positioning of the solder joints. A cylinder drives the mounting frame to make small-amplitude adjustments to the solder gun, ensuring precise alignment of the nozzle with the solder joint and improving the quality of precision solder joints. The solder feeding assembly features a double-wheel pressure clamping structure, with a tension spring providing constant pressure to adhere to the solder wire, preventing slippage and jamming. A rod, in conjunction with a limiting groove, constrains the swing amplitude of the oscillating plate, ensuring stable pressure and speed, precise solder feeding, and reducing defects such as insufficient solder accumulation and leakage, making it suitable for long-term continuous automated soldering.

The present application relates to the field of heat pipe welding, and particularly relates to a kind of automatic sealing welding device of liquid-filled heat pipe.Solve the current welding of liquid-filled heat pipe mainly for manual welding, there is the technical problem of low production efficiency, the liquid loss of heat pipe is larger, and the welding quality is not the same.A kind of automatic sealing welding device of liquid-filled heat pipe, including adjustable feeding mechanism and integrated extrusion, shearing, welding mechanism;Adjustable feeding mechanism includes: for placing the material bin of to-be-welded liquid-filled heat pipe, for adjusting the lifting mechanism of material bin height and horizontal angle, for rotating the rotating mechanism of material bin;The integrated extrusion, shearing, welding mechanism is installed on a movable slide rail by integrated platform;Extrusion mechanism is used for extruding the end of to-be-welded liquid-filled heat pipe, shearing mechanism is used for shearing the excess part of the end of to-be-welded liquid-filled heat pipe, and welding mechanism is used for sealing welding to the end of to-be-welded liquid-filled heat pipe.

The utility model discloses a kind of suitable for shear type lifting machine welding production line, including total feeding station, drum conveying line, first welding station, second welding station, third welding station, total unloading station, total feeding station is transported to the transmission on drum conveying line by shear type lifting machine spare;Through first welding station, the welding of the tooling after feeding is carried out, then is transported to second welding station by drum conveying line;Through second welding station, the welding of the tooling after feeding is formed, then is transported to third welding station by drum conveying line;Through third welding station, the welding of the tooling after feeding is formed, then continues transmission to total unloading station by drum conveying line;Total unloading station is transferred from drum conveying line by the finished product of welding formation.The efficiency and flexibility of welding operation are improved by reasonable station layout and flexible transmission system, adapt to a variety of welding needs, with good market application prospect.

The utility model provides a welding tool for a lengthened ladder stand. The welding tool comprises a supporting piece, a welding piece and a welding piece, wherein the supporting piece is used for bearing vertical pipes on the two sides of the ladder stand; the positioning piece is used for bearing a transverse plate in the middle of the ladder; the mounting parts are used for fixing ladder legs on two sides of the ladder; the supporting piece, the positioning piece and the mounting piece are all mounted on the bottom plate, and a working position for assembling the crawling ladder is formed among the supporting piece, the positioning piece and the mounting piece; a plurality of bottom plates are arranged, and the plurality of bottom plates with the supporting pieces, the positioning pieces and the mounting pieces are connected with one another to form the welding tool matched with the length of the crawling ladder. The beneficial effect of the utility model is that (this is the beneficial effect corresponding to the above subject).

This invention relates to the field of welding fixtures for busbar trunking production, and particularly to a welding fixture for busbar trunking production. The fixture includes a base, a fixed column fixedly connected to the base, a top seat fixedly connected to the top of the fixed column, a welding fixture mechanism rotatably connected to the top seat, a rotating seat rotatably connected to the outer wall of the bottom end of the fixed column, multiple placement frames fixedly connected to the rotating seat, an automatic feeding mechanism rotatably connected to the placement frames, and a movable limiting plate rotatably connected to one side of each placement frame. By setting a bending frame adapted to the shape of the bent busbar trunking, and simultaneously setting rotatable rotating rods at multiple positions on the bending frame, the rotating rods drive the abutment wheel to abut against the inner wall of the bent busbar trunking when rotated, thereby achieving clamping of the bent busbar trunking. This avoids the loosening or deformation problems caused by the unsuitable clamping method of traditional fixtures, thus improving the stability during the welding process.

A kind of orthogonal circular tube intersecting line welding equipment, including workbench, still fixedly installed with horizontal front-rear direction B axis on workbench, B axis is driven by motor, and the cylinder of branch pipe pressure pipe cylinder is fixedly connected with pressing plate on the cylinder rod of branch pipe pressure pipe cylinder, and the joint is fixedly connected on pressing plate, multiple front-rear distribution workpiece seats are fixedly installed on workbench, the V-shaped clamping groove of opening upward is set in workpiece seat, two for compacting main pipe compacting cylinders are also installed on workbench, main pipe is horizontal pipe, branch pipe is vertical pipe, the diameter of branch pipe is less than the diameter of main pipe, positioning plate is placed on one workpiece seat, V-shaped groove and arc-shaped groove are respectively set in the front and rear two end faces of positioning plate, in the view of top view, the bottom of V-shaped clamping groove, V-shaped groove, arc-shaped groove is on a straight line.This equipment effectively reduces the cost of welder.

The invention provides automatic welding equipment for cabinet processing, which comprises a welding robot and a workbench, and further comprises a pressing and positioning mechanism arranged on one side of the workbench and a cleaning mechanism arranged on the workbench, the pressing and positioning mechanism comprises a sliding rail fixed to one side of the workbench, a moving base arranged on the sliding rail in a sliding mode, a mounting base fixed to the moving base, a rotating shaft rotationally arranged on the mounting base, a supporting plate fixed to one end of the rotating shaft and an electromagnet arranged on the supporting plate. The electromagnet is used for adsorbing and fixing a workpiece to be welded, and the pressing and position adjusting mechanism further comprises a position adjusting assembly used for driving the rotating shaft to rotate so that the supporting plate can be switched between the horizontal posture and the vertical posture; the problems that in existing equipment, workpiece pressing and adjusting are inconvenient, interference is likely to happen in the welding process, and the welding slag cleaning efficiency of a workbench is not high are solved.

The invention relates to a welding strip obtaining method and a welding method of a solar cell piece. The welding strip obtaining method comprises the following steps that effective welding parameters of a welding device are obtained; obtaining effective geometric parameters of the solder strip; based on the effective welding parameters and the effective geometric parameters, the yield strength range matched with the welding strip is obtained; and based on the yield strength range, a welding strip matched with the welding device is selected. According to the solder strip obtaining method and the welding method of the solar cell, the pseudo soldering rate of the solder strip is remarkably reduced, the solder strip is prevented from plastic deformation, cross section area reduction or snap due to overlarge wire winding tension, and the resistance of the solder strip is prevented from being increased, so that the welding quality and the electrical performance are improved.

The utility model discloses a kind of auxiliary tool convenient for pipe welding, it is related to pipeline welding technical field, specifically a kind of auxiliary tool convenient for pipe welding, including mobile support, top plate and roller stand, the mobile support is provided with two groups, and is dynamically connected with adjusting mechanism on mobile support, the bottom of top plate is equipped with universal wheel, roller stand is installed on the surface of mobile support, one side of roller is provided with start-stop mechanism, and one end of sliding seat is detachably connected with support clamping seat. The auxiliary tool convenient for pipe welding, by adopting the setting of support clamping seat and level, the effect of quick and accurate butt joint is realized, the welding efficiency is improved, by the detachable setting of adjusting mechanism and connecting sleeve and sliding seat, the purpose of improving the applicability of the device is achieved, by the setting of start-stop mechanism, the roller can be frictionally fixed during use, prevent the pipe box from rotating during welding, improve the welding quality.

A power package and an electronic device, the power package comprising: a package substrate, the package substrate being provided with a pad region, the pad region being provided with a protrusion structure; the power device is arranged on the packaging substrate and is electrically connected with the bonding pad area; and the lead frame is welded on the bonding pad area through a solder layer, and the solder layer at least covers the surface of the convex structure and the surface of the bonding pad area. The welding quality between the lead frame and the packaging substrate is improved, and reliable electric connection between the lead frame and the packaging substrate is ensured.

This invention provides an auxiliary tooling for flipping circuit board welding, including a support assembly. A flipping assembly is mounted on top of the support assembly. The flipping assembly includes a pneumatic telescopic rod, a support plate, a servo motor, a connecting plate, a stepper motor, a groove, a bidirectional threaded rod, and a clamping plate. The support plate is fixedly connected to the top of the pneumatic telescopic rod, and a servo motor is mounted on one side of the support plate. This invention uses the servo motor to drive the connecting plate to rotate, causing the circuit board to flip, facilitating welding operations on the other side of the circuit board. This eliminates the need for manual flipping of the circuit board, improving welding efficiency and quality, and reducing the risk of circuit board contamination. The stepper motor drives the bidirectional threaded rod to rotate, and the threaded engagement causes the clamping plate to clamp the circuit board, preventing displacement of the circuit board during the flipping process, thus meeting the needs of automated, high-precision welding production.

The invention belongs to the technical field of metal explosive cladding manufacturing, and discloses an explosive welding initiating explosive forming mold, an initiating explosive column and an explosive welding method. The mold comprises a pipe body and a cone assembled in the pipe body. The top end of the cone is upward, and a gap is reserved between the bottom face of the cone and the lower end face of the tube body, so that an upper columnar charging cavity and a lower conical energy gathering cavity are formed in the tube body. By means of the simple split design, traditional manual explosive pit digging operation is converted into a standardized process, the energy-gathered initiating explosive column with the highly-consistent shape, size and explosive loading amount is prepared, personal errors are thoroughly eliminated, and repeatability of initiation energy is guaranteed. And meanwhile, the bottom energy gathering cavity structure is beneficial to improving the energy utilization rate, and is particularly suitable for explosive welding of the multi-layer metal plate with the medium thickness. The device has the remarkable technical advantages of simple structure, low cost, time-saving operation, safety, high efficiency, batch production and the like.

A laser welding device and method for sealing nails of large cylindrical batteries with adjustable local atmosphere belongs to the field of new energy vehicle battery welding technology. The device includes an outer shell fitted onto the top of the battery casing, a high-lens lens mounted on the top of the outer shell via a supporting frustum, an annular gas path structure disposed inside the outer shell, dividing the back of the outer shell into upper and lower chambers, a vacuum device connected to the upper chamber via a pipeline, and a dust removal device connected to the annular gas path built into the annular gas path structure via a pipeline. The annular gas path has multiple suction ports connected to the lower chamber. An elastic sealing ring is disposed in the lower chamber, and a centering ring is clamped between the elastic sealing ring and the battery casing. A sealing nail is installed on the inner ring of the centering ring. This method achieves reliable connection of sealing nails for large cylindrical batteries, improves welding quality, reduces welding defects, and solves the problem of low yield after welding sealing nails for large cylindrical batteries.

The utility model relates to welding equipment technical field, concretely relates to a kind of intelligent gantry submerged arc automatic welding machine, it includes: piece platform, top is equipped with multiple piece grooves along length direction, and both sides are equipped with machine tool track respectively;Welding machine tool, welding machine tool is transversely placed above piece platform, and two ends are respectively equipped with with machine tool track cooperation walking mechanism, welding machine tool top is respectively equipped with welding machine power supply corresponding each piece groove;Movable crossbeam, movable crossbeam is horizontally arranged in welding machine tool middle part, and movable crossbeam is equipped with with each piece groove corresponding cross slide;Telescopic arm, respectively with each cross slide corresponding each cross slide connection, bottom end is respectively equipped with welding torch, welding torch is connected with corresponding welding machine power supply;Controller, controller is set in one side of welding machine tool, and walking mechanism, telescopic arm, welding machine power supply and welding torch are respectively electrically connected with controller.The utility model is integrated, and automation design has significantly improved the efficiency and quality of I-shaped steel structure welding.

The application discloses a kind of automobile sheet metal welding equipment, including laser welding device, angle adjusting platform, at least one fixed clamping mechanism and turnover clamping mechanism;Fixed clamping mechanism and turnover clamping mechanism are used to clamp the sheet metal of different positions to be welded, and fixed clamping mechanism and turnover clamping mechanism are formed in the upper of sheet metal Avoidance area, laser welding device is suitable for translation along avoidance area to perform the welding of sheet metal;Angle adjusting platform is used to adjust the welding direction of sheet metal, and turnover clamping mechanism is used to turn over sheet metal.The beneficial effects of the application are: by setting angle adjusting platform, the position of sheet metal is adjusted in real time, so that the welding position of sheet metal can always be kept perpendicular to laser welding device, so as to improve the welding quality of sheet metal.At the same time, the turnover of sheet metal can be completed without re-clamping by turnover clamping mechanism, so as to improve welding efficiency.

The invention provides a microstructure electrode capable of realizing solder confinement infiltration and a preparation method thereof, a radial microgroove structure, an annular microgroove structure and a parallel line microgroove structure are sequentially engraved on the surface of the electrode to form functional combinations of different microstructures, and the microstructure electrode capable of realizing solder confinement infiltration is obtained. Fine machining of the microstructures on the surface of the electrode and functional combination of different microstructures are adopted, the wettability of the welding flux is enhanced through the radial microgroove structures in the center area, the spreading shape of the welding flux is controlled through the annular microgroove structures in the edge area, overflowing of the welding flux is restrained, and diffusion of the welding flux is guided through the parallel line microgroove structures in the connecting area. Therefore, through mutual combination and accurate processing of the microstructures with different functions, confinement infiltration of the welding flux on the surface of the electrode is realized, and the welding quality of the electronic element and the electrode is optimized.

The invention provides a double-shaft-shoulder friction stir welding device with an adjustable shaft shoulder distance and a friction stir girth welding method of the double-shaft-shoulder friction stir welding device. The device comprises an adjustable double-shaft-shoulder stirring tool (1), a rotating main shaft (3), a withdrawing shaft (4), a clamp (5), a positioning platform (6) and a workbench (7), the adjustable double-shaft-shoulder stirring tool (1) is composed of an upper shaft shoulder, a lower shaft shoulder and an adjustable stirring needle, and the rotating main shaft (3) is adopted for controlling rotation of the adjustable double-shaft-shoulder stirring tool (1); and the withdrawing shaft (4) is adopted to adjust the length of the stirring needle. According to the adjustable stirring device, the adjustable stirring needle can freely stretch out and draw back through the withdrawing shaft (4), so that the distance between the shafts can be controlled, and the adjustable stirring device can adapt to welded workpieces (2) with different plate thicknesses. In addition, the press-in amount of the upper shaft shoulder and the lower shaft shoulder can be adjusted in the welding process, and welding forming is better facilitated. The adjustable double-shaft-shoulder stirring tool (1) is not only suitable for common welding seams, but also suitable for closed circumferential welding seams.

The application provides a hot-rolled rib steel bar butt welding device based on high-frequency brazing and a use method, which comprises multiple guide wheel groups arranged on a support frame in a transverse direction, the steel bar moves against the multiple guide wheel groups, and a cutting device, a rotating mechanism, a high-frequency brazing device and a hydraulic pushing device are sequentially arranged on one side of the multiple guide wheel groups; the two ends of the butt joint steel bar are cut off by a saw blade of the cutting device and are conveyed into the high-frequency brazing device, the steel bar specification is automatically identified and the corresponding welding parameters are adapted, and the butt end face is polished, heated, upset and rotated to complete butt joint in a carbon dioxide environment. The application has the advantages of simple structure, high automation degree, realization of unmanned steel bar butt welding processing, stable welding joint quality, small impact on the power grid, no splashing, replacement of resistance butt welding, flame brazing and flash butt welding processes in traditional steel bar butt welding and solution to the problems of slag inclusion, hollow and low strength in other steel bar butt joints based on high-frequency welding.

The invention provides a four-way valve assembly machining method which comprises the following steps that a four-way valve and an aluminum pipe are provided, and the four-way valve is provided with an aluminum connecting part; the four-way valve and the aluminum piping are assembled; one end of the aluminum piping is connected with the aluminum connecting part in a matched mode; and the four-way valve and the aluminum piping which are assembled are welded and fixed through flame brazing or high-frequency welding. The four-way valve is provided with an aluminum connecting part, so that welding connection of the four-way valve and the aluminum piping is facilitated.

This utility model discloses a pressing device for circuit boards, relating to the field of circuit board technology. A movable component is fixedly installed inside the frame, and a cleaning component is fixedly installed on the inner wall of the frame. A pressing component for pressing the circuit board and aluminum sheet is installed on one side of the cleaning component. The pressing component includes a support frame fixedly installed on the inner wall of the frame, a drive cylinder fixedly installed on the top of the support frame, a pressing head fixedly installed at the output end of the drive cylinder, and a telescopic rod rotatably installed on one side of the pressing head. The circuit board and aluminum sheet are bonded together using 3M 9079 adhesive. The circuit board is an FR4 circuit board. This utility model solves the deformation problem caused by the inconsistent expansion coefficients of FR4 circuit boards and aluminum sheets after SMT high-temperature reflow soldering by using 3M 9079 adhesive to bond them together, ensuring the flatness and stability of the finished product, and improving the soldering quality of electronic components on the circuit board.