2741 results about "Spot welding" patented technology

The invention relates to visual identification line drawing assembly welding equipment which comprises a welding conveying assembly, the welding conveying assembly comprises a platform frame and a conveying roller installed on the platform frame and used for conveying a packing machine plate, the conveying direction of the conveying roller is defined as the first direction, and the other horizontal direction perpendicular to the first direction is defined as the second direction; a self-walking line drawing assembly, a self-walking spot welding assembly and an auxiliary positioning assembly which move in a reciprocating mode in the first direction are arranged on the platform frame. According to the automatic line drawing and welding device, line drawing and welding of the packing machine plate are achieved through joint cooperation of the welding conveying assembly, the self-walking line drawing assembly, the self-walking spot welding assembly and the auxiliary positioning assembly, spraying drawing of visual recognition color lines of different colors can be achieved only through one-time walking, the line drawing efficiency is greatly improved, and the labor intensity of workers is lowered. And an automatic accurate assembling and positioning function and visual intelligent welding are realized.

The invention discloses a method and system for detecting abnormal welding spots in the spot welding process. The method comprises the steps that a time sequence data sequence collected in real time in the welding process is obtained; calculating a first-order difference sequence of the time sequence data sequence; screening a target data segment representing a stable trend based on the first-order difference sequence; performing linear fitting on the first K data points of the target data segment to obtain a first trend direction; performing linear fitting on the last K data points of the target data segment to obtain a second trend direction; calculating the variable quantity of the first trend direction and the second trend direction; and when the variable quantity exceeds a preset threshold value, it is judged that welding is abnormal, and an alarm is triggered. The stable trend section is screened through the differential sequence, noise interference is effectively eliminated, and it is ensured that the quality criterion is based on reliable data. And whether the welding spot is abnormal or not is quickly and accurately judged, so that real-time and non-destructive spot welding quality on-line monitoring is realized.

The invention relates to the technical field of inductor coil preparation, in particular to a coil winding, paint stripping and spot welding all-in-one machine and a control system thereof.The coil winding, paint stripping and spot welding all-in-one machine comprises a rack, a wire supply mechanism, a wire stripping mechanism, a winding mechanism, a spot welding mechanism, a material returning mechanism, a demolding mechanism and a cutting mechanism; the wire stripping mechanism comprises a wire stripping cutter, a box body and a cutter driving motor, the wire winding mechanism comprises a material receiving platform, an upper cutting die, a lower cutting die and a wire winding cutter, the spot welding mechanism comprises an upper pole head, a lower pole head and a storage jig, the material returning mechanism comprises a station table and a reset air cylinder, and the demolding mechanism comprises a demolding air cylinder and a demolding ejection block. The cutting mechanism comprises a first stock bin, a second stock bin, a mechanical arm and a cutting die, the mechanical arm is used for placing the electrode plates on the containing jig and conveying the electrode plates subjected to spot welding to the cutting die, and all manufacturing links can be sequentially completed by clamping the workpieces in the automatic clamp and the multi-station conveying system at a time.

The invention relates to the technical field of forge piece forming, in particular to a deep-cavity thin-wall support forge piece, a forging die and a forming method.The deep-cavity thin-wall support forge piece is characterized in that a heated round bar is subjected to roll forging to obtain a preformed blank, and oxide skin of the blank obtained after roll forging is removed; putting the prefabricated blank into a pre-forging cavity of a forming die, and performing pre-forging forming; after pre-forging is finished, the pre-forged piece is transferred into a precision forging cavity of the same forming die to be subjected to precision forging forming, and a bilaterally symmetrical precision forging piece is obtained; putting the bilaterally symmetrical precision forgings into a slicing die frame for trimming, and cutting off flashes; cutting the bilaterally symmetrical precision forgings subjected to cold shaping from the shunting bin through a cutting device, and separating the bilaterally symmetrical precision forgings into two independent single forgings; forming defects are eliminated, and the forging yield is improved to the level of stable mass production; the thickness tolerance of the functional surface of the product is ensured, the spot welding current stability and the welding strength are ensured, the assembly requirement is met, and the dependence on subsequent machining is reduced; the material cost is reduced and the mold life is prolonged.

The invention provides a portable modularized electroencephalogram signal acquisition device which comprises an acquisition device host, the acquisition device host comprises a top shell assembly, a bottom shell assembly, a plurality of electrode units, a plurality of electrode wires, a first plug connector and a second plug connector, the top shell assembly is detachably connected with the bottom shell assembly, the electrode units are installed on the bottom shell assembly, and the first plug connector and the second plug connector are detachably connected. The electrode units are correspondingly connected with the electrode wires respectively, the ends, away from the electrode units, of the electrode wires are connected with the first plug connector, the second plug connector is installed on the top shell assembly, and the first plug connector is detachably connected with the second plug connector. According to the device, electrical connection points of all electrode units are highly integrated in the first connector, traditional complex operation of multi-point welding or multi-connector connection is replaced by the plugging action of the first connector and the second connector, and an integrated quick connection structure is formed. The most complex internal circuit connection steps are fundamentally simplified, and the assembly efficiency and reliability are greatly improved.

Disclosed is a detection device for laser spot welding micro-weld spot quality based on laser ultrasound, comprising: a nanosecond pulsed laser configured to emit a laser; a half-wave plate configured to generate a phase difference of the laser; a scanning galvanometer configured to focus the laser as a point source and excite an ultrasonic wave on a surface of a sample; a multi-axis displacement platform configured to place and / or move the sample; a laser Doppler vibrometer configured to emit a probe light; an image sensor configured to acquire image data of the sample in a plurality of attitudes; an optical filter configured to receive the probe light to adjust an intensity of the probe light; and a processor configured to be in communication connection with the image sensor, the optical filter, the nanosecond pulsed laser, the scanning galvanometer, the multi-axis displacement platform, and the laser Doppler vibrometer.

The invention discloses electronic detonator spot welding defect detection equipment which comprises a bottom bearing plate, a telescopic fixing structure is arranged at the upper end of the bottom bearing plate, a circulating feeding structure is arranged in the telescopic fixing structure, and a testing structure is arranged at the upper end of the telescopic fixing structure. The telescopic fixing structure comprises side supporting plates symmetrically and fixedly arranged on the top face of the bottom bearing plate. According to the electronic detonator spot welding defect detection equipment provided by the invention, the telescopic fixing structure is arranged, and two groups of transverse electric push rods which are symmetrically arranged drive clamping plates at the upper ends to get close to each other, so that electronic detonator control plates with different sizes on the surface of the top plate can be fixed; and meanwhile, a longitudinal electric push rod is matched to drive a test meter and a test needle head on the top to descend to be in contact with a welding spot on the surface of the control panel, so that whether the welding spot has pseudo soldering or not can be detected, compared with an existing detection device, the detection efficiency of the control panel can be effectively improved, and meanwhile higher adaptability is achieved for control panels of different sizes.

The invention relates to the field of automobile part machining, and discloses an automatic welding device for a light automobile axle housing rear cover, a first roller conveyor is arranged to convey an axle housing main body and a rear cover which are connected together through spot welding, so that the axle housing main body enters a position on a bearing plate to stop conveying; then, a jacking air cylinder stretches to drive a lifting plate, a rotating shaft and a bearing plate to vertically ascend along a sliding rod to jack up the axle housing main body workpiece till a rear cover is tightly attached to the concave position of a fixing block, then a micro motor drives a second gear to rotate, and therefore a first gear, the rotating shaft and the bearing plate are driven to rotate for welding work, and people do not need to rotate around the axle housing main body for welding; after external welding is completed, the micro motor stops rotating, the bearing plate is made to be distributed in an original cross shape, the jacking air cylinder shrinks to drive the bearing plate to return to the original position, and at the moment, the first roller conveyor is started to convey the workpiece to the overturning station. The device has the advantages and effects that automatic overturning of the axle housing is achieved, manual rotating ring welding is not needed, and welding is rapid and efficient.

The utility model discloses a normally open solenoid valve for an automobile multi-cavity air spring, which comprises a shell, a framework arranged in the shell, an enameled wire wound on the outer side of the framework, a magnetism isolating tube arranged in an inner hole in the middle of the framework, a movable iron core arranged in the magnetism isolating tube, and a cushion block assembly arranged between the magnetism isolating tube and the end part of the movable iron core, an electrical interface is installed at the end of the shell, a valve seat is installed at the second axial end of the shell, a base is installed between the valve seat and the framework, an ejector rod piece capable of moving axially is arranged at the position, corresponding to the valve port, between the base and the valve seat, the first end of the ejector rod piece penetrates through the base to abut against the movable iron core, and a connecting socket is arranged at the end of the framework. The connecting socket is connected with a PIN needle in the electrical interface, a limiting claw is arranged at the side end of the PIN needle, and after the limiting claw is bent, the enameled wire is pressed and fixed on the PIN needle and is subjected to spot welding. The electromagnetic valve can solve the problems that an electric power connection structure of an existing electromagnetic valve is complex, and power connection is not reliable.

The utility model provides a charge coupled device (CCD) tin wire soldering machine, which relates to the technical field of tin wire soldering machines and comprises a machine body, and a support base is fixedly mounted at the bottom end of the machine body. By arranging the machine body, the supporting base, the working platform, the drawer, the lamplight plate, the illuminating lamp, the camera, the lead screw module, the base plate, the Y-direction movement shaft, the Z-direction lead screw, the Z-direction servo motor, the upper silver guide rail and the like, when the equipment is used, manual labor can be effectively solved, manual operation and certain technical errors are reduced, and the production efficiency is improved. And meanwhile, by arranging the fixing plate, the front arm and other structures, any position needing to be welded can be adjusted, and automation and intellectualization are achieved in the welding process. And meanwhile, the welding has the functions of flexible and diversified tin soldering modes, spot welding, drag welding and the like so as to adapt to various high, medium and low-difficulty tin soldering operations, so that the welding quality is improved.

The invention discloses a green laser and a laser welding machine. The green laser comprises a pumping source, a first reflector, a laser crystal, a polarization beam splitter, a second reflector, a frequency doubling crystal, a telescope lens group and a spectroscope; the pumping source provides pulse pumping light; the laser crystal absorbs the pulse pump light to generate fundamental frequency laser in an infrared band, the fundamental frequency laser enters the polarization beam splitter and is split into P polarized light and S polarized light, the P polarized light is transmitted out of the resonant cavity, and the S polarized light is transmitted in the resonant cavity; and the telescope lens group converges the fundamental frequency laser to the frequency doubling crystal to generate frequency doubling laser of a green light wave band, and the frequency doubling laser is transmitted by the spectroscope and then is output. The green laser is used for spot welding of high-reflection materials such as copper and aluminum, the maximum single pulse energy can reach 5 J, the maximum peak power is 2 kW, the pulse width ranges from 0.05 ms to 5 ms, the problem of low absorption of the high-reflection materials to laser in the 1-micron wave band is solved, and the green laser is an edge tool for precise spot welding of the high-reflection materials.

The spot welding robot based on industrial welding machining comprises an outer frame fixing assembly, a machined part conveying assembly and a welding assembly, the outer frame fixing assembly comprises an outer frame, an outer ring frame, a first driving part, an inner ring frame and a limiting clamping rod, the outer ring frame is arranged in the outer frame, the first driving part is arranged on the outer frame, and the inner ring frame is arranged on the outer frame; the inner ring frame is arranged at the output end of the driving part, the multiple sets of limiting clamping rods are arranged on the inner ring frame in an annular array mode, the machined part conveying assembly is arranged in the outer frame fixing assembly and comprises a driving mechanism and a positioning mechanism, the driving mechanism is movably arranged in the outer frame fixing assembly, and the positioning mechanism is arranged on the outer frame fixing assembly. The positioning mechanism is movably arranged on the driving mechanism, and the welding assembly is arranged in the outer frame fixing assembly. Therefore, the ejector rod is linked with the variable-diameter annular plate, conveying of the machined part and the to-be-machined part is completed, the to-be-machined part is reinforced in cooperation with the telescopic mechanism, and the stability of the machined part is guaranteed.

A spot welding tip for a short flange of a car body panel may include a tip mounting portion having a cylindrical structure and forming a closed upper surface, and a truncated cone-shaped tip head portion formed in a vertical direction from a center of the upper surface of the tip mounting portion, wherein a fore end diameter of the tip head portion is formed to be smaller than a diameter of the tip mounting portion. A spot welding machine may include and / or operate with the spot welding tip

The invention discloses auxiliary spot welding equipment for linear motor manufacturing, and relates to the technical field of linear motor production. The auxiliary spot welding equipment for linear motor manufacturing comprises a welding bin, a through lead screw is rotationally connected to the interior of the welding bin, a sliding seat is slidably connected to the inner wall of the welding bin, and a spot welding head driven by an electric telescopic rod is assembled at the bottom of the sliding seat; a clamping plate is assembled on the side surface of the push rod; a first hydraulic bin is assembled on the outer side of the lead screw. According to the auxiliary spot welding equipment for linear motor manufacturing, a lead screw rotates rapidly, so that when rapid moving welding operation is carried out, a first hydraulic bin, a first arc spring, a moving block, an arc plate, a second hydraulic bin, a first stress rod, a second spring, a first hose, a third hydraulic bin and an ejector rod are matched, and then a first stress plate can apply extra force to a clamping plate through a third spring; and the stability of the device under the condition is improved.

The invention belongs to the technical field of engine cylinder machining, and particularly relates to an aircraft engine cylinder machining device and method. The device is reasonable in design, all the components cooperate with one another, and the outer cylinder component is clamped through the outer cylinder clamping and conveying assembly and driven to move to the first butt joint station, the second butt joint station and the welding station; an inner cylinder clamping and positioning assembly arranged at the first butt joint station is used for clamping the inner cylinder component, and the inner cylinder component and the outer cylinder component are located at the butt joint position; a cover plate clamping and positioning assembly arranged at the second butt joint station is used for clamping the cover plate component, and the cover plate component and the outer cylinder component are located at the butt joint position; the welding assembly arranged above the welding station is used for fixing the outer cylinder component and the inner cylinder component in a spot welding mode and then fixing the outer cylinder component and the cover plate component in a full-seam welding mode, in this way, the welding assembly requirement of the combined type air inlet cover cylinder is met, and the combined type air inlet cover cylinder obtained through machining has the advantage of being high in structural strength.

The utility model discloses a welding device and a welding system. The welding device comprises a welding gun; the electrode assembly comprises a first electrode and a second electrode, and the second electrode is suitable for being connected with the welding gun; the positioning block is connected with the first electrode; the correction assembly is suitable for being arranged between the first electrode and the second electrode, the correction assembly comprises a copper electrode, a to-be-welded part is arranged on the copper electrode, the contact end of the first electrode is suitable for being in surface contact with the copper electrode, and the contact end of the second electrode is suitable for being in surface contact with the to-be-welded part. According to the welding device, the end face of the electrode is enlarged, indentations are reduced, the appearance quality problems of welding spot distortion and too deep indentations on the appearance face in the existing manual resistance spot welding process are solved, the situation that the welding spot is distorted due to the fact that the electrode assembly is difficult to be perpendicular to the plane of the piece to be welded is avoided, and the appearance quality of the welding spot is optimized.

The invention discloses a method for prolonging the service life of a resistance spot-welding electrode, a manufactured resistance spot-welding electrode cap and application, and the method comprises the following steps: taking a chromium-zirconium-copper electrode cap as a base body, grinding the working surface of the base body step by step by adopting abrasive paper, and then sequentially polishing, ultrasonically cleaning and drying to obtain a pretreated base body; performing vacuum zirconium permeation treatment on the pretreated matrix by adopting a permeation agent so as to form a zirconium-rich solid solution diffusion layer in the pretreated matrix, thereby obtaining the matrix subjected to zirconium permeation reinforcement; physical vapor deposition treatment is adopted, and a metal transition layer is deposited on the surface of the solid solution diffusion layer of the matrix subjected to zirconium permeation strengthening; wherein the metal transition layer is a Cr transition layer or a Ti transition layer; and a graphite target and titanium target co-sputtering mode is adopted, and a composite gradient functional layer is sputtered and deposited on the surface of the metal transition layer of the matrix treated in the step S3. The electrode service life of the method is improved by magnitude order, and the effect is extremely remarkable.

The invention provides an intelligent optimization method and system for technological parameters of a galvanized steel sheet. The method comprises the following steps: performing thickness detection on different areas of a plating layer formed on the surface of a galvanized steel sheet to obtain final plating layer thickness distribution data. And according to the temperature distribution data and the final coating thickness distribution data, heat conduction efficiency correction parameters of all the heating areas of the molten zinc tank are generated. According to the heat conduction efficiency correction parameters of all the heating areas of the molten zinc tank, a pre-trained first process parameter intelligent optimization model is adopted to optimize galvanization time and temperature distribution data, and a pre-trained second process parameter intelligent optimization model is adopted to optimize electrode pressure parameters and resistance spot welding parameters in the welding stage; the mass estimation value of the galvanized steel sheet is greater than a preset mass threshold value. According to the technical scheme, the galvanizing process and the welding parameters are intelligently optimized through double models, the production line is dynamically adjusted based on real-time data, and it is ensured that the quality of the galvanized steel sheet stably reaches the standard.

The utility model provides a semi-automatic micro spot welding machine part positioning mechanism, which belongs to the technical field of welding and comprises a shell, a clamping component, a positioning component and a positioning component. Wherein the clamping assembly comprises a chuck, a restraining disc, a limiting rod, a fine adjustment rod, a fine adjustment button, a spring sleeve, a fine adjustment block, a limiting disc, a first clamping block and a second clamping block, the chuck is fixedly arranged at the top of the outer wall of the moving table, the limiting rod is fixedly arranged at the bottom of the outer wall of the restraining disc, and the limiting rod is embedded in the chuck; and the spring sleeve is sleeved on the outer wall of the fine adjustment rod. By means of the clamping assembly, stability and reliability of double clamping can be achieved, a fine adjustment mechanism adapts to various workpieces, in the high-speed moving process, the problems that the workpiece shakes, the welding precision is lowered, and insufficient welding and wrong welding are caused are solved, movement or deformation of a welded part in the welding process is effectively prevented, and the welding quality is improved. And therefore, the welding precision and consistency are ensured.

The invention discloses a rotating disc type multi-station magnetic head spot welding machine with a welding fume purification effect, and relates to the technical field of spot welding machines. A welding machine; the welding fume purification mechanism is used for collecting solid residues in welding fume, the gas box is fixedly connected to the outer surface of the welding fume purification mechanism, the welding fume purification mechanism is arranged, so that the welding fume generated during spot welding of the magnetic head can be purified, particulate matter and disintegrating residues generated during spot welding can be collected, and the welding fume purification efficiency is improved. In the subsequent discharging process, the collected particulate matter and disintegrating slag can be effectively discharged, and the particulate matter and disintegrating slag are prevented from leaking; the multi-station placing mechanism is used for placing a plurality of magnetic heads, and by arranging the multi-station placing mechanism, the plurality of magnetic heads needing spot welding can be placed at the same time, so that when spot welding work is conducted on the magnetic heads, the effect of continuous work can be achieved, and the effect of fully purifying welding fume generated by spot welding is achieved.

According to the automatic battery feeding device for battery pack machining and the using method, the automatic battery feeding device for battery pack machining comprises a rack, and further comprises a battery storage assembly, a battery discharging assembly, a vibration anti-blocking assembly, a battery conveying assembly, a feeding assembly and a guiding conveying assembly. According to the automatic battery feeding device, the batteries can be automatically conveyed into the jig, so that automatic feeding of the batteries is achieved, personnel investment during spot welding is reduced, meanwhile, slow feeding caused by long-time work of workers is avoided, the production efficiency is improved, and through cooperative work between the battery discharging assembly and the vibration anti-blocking assembly, the production efficiency is improved. When a battery is fed, the battery containing box is synchronously driven to move, so that normal discharging is guaranteed, the battery discharging device and the vibration anti-blocking assembly can achieve all actions only through a single power source, and energy loss and cost are reduced.

The present invention is applicable to the technical field of welding devices, and provides a printing plate roller welding device, which includes a device main body, a moving slide, a first support frame, a second support frame, a welding machine table and a welding device. It further includes a rotating mechanism, a centering clamping mechanism and a centering alignment mechanism. The centering alignment mechanism includes a mounting assembly, a mounting support, a centering alignment assembly and an adjustment assembly. Through the moving slide and the rotating mechanism, the centering alignment mechanism can not only quickly center the printing plate roller and the roller core, ensure the coaxiality of the printing plate roller and the roller core, and reduce manual intervention, but also drive the end cover and the printing plate roller to rotate intermittently, so that the welding device can perform preliminary spot welding on the end of the end cover and the printing plate roller. The centering clamping mechanism can not only complete the centering clamping of the printing plate roller through the moving slide and the rotating mechanism, ensure that both ends of the printing plate roller are in a concentric position, but also drive the clamped printing plate roller to rotate circumferentially, realizing the circumferential continuous welding of the end of the printing plate roller by the welding device.

A spot welding positioning device for a wind power tower belongs to the technical field of spot welding positioning and comprises a base, self-adjusting roller carriers are fixedly mounted at the two ends of the top of the base, a plurality of sliding grooves are formed in the top of the base, and moving frames are slidably connected to the inner walls of the sliding grooves. A mounting frame is fixedly connected between the two corresponding moving frames, and a locking mechanism is arranged on the inner wall of the mounting frame; the multiple abutting rods are driven to contract in the center direction of the connecting ring, the ends of the abutting rods are all extruded on the outer wall of the wind power tower barrel, accurate axis positioning is achieved, meanwhile, the other locking mechanism drives the adjacent tower barrels to synchronously move to the corresponding axes, and it is ensured that the axes are accurately aligned when the tower barrels with different diameters make contact; the design that the connecting rod slides along the inclined groove can automatically contract in the radial direction and continuously apply pre-tightening force, various diameter specifications can be adapted without manual adjustment, the operation process is remarkably simplified, and the spot welding positioning efficiency and reliability of the wind power tower barrel are greatly improved.

The application discloses a DSP high-frequency inverter table type micro spot welding machine and relates to the technical field of electric welding machines.The machine tool is internally fixedly installed with a welding main machine, the inner wall bottom of the machine tool is fixedly installed with a linear driving mechanism, the output end of the linear driving mechanism is fixedly installed with a spot welding machine main body, the outer side wall of the machine tool is fixedly installed with a heat dissipation device, the top of the machine tool is fixedly installed with a three-color lamp, the inner wall bottom of the machine tool is fixedly installed with a rectangular plate, one side of the rectangular plate close to the spot welding machine main body is provided with a rectangular groove, the fixing device comprises a pull rod, a carrying table, a loading disc, a welding piece, a sliding table, a flexible block, a tungsten filament, a linkage plate, a rubber plate, a pushing plate, a No.1 spring and a limiting rod, the welding piece and the tungsten filament are attached by standard operation, the angle of attachment can be adjusted by the operator in a safe area, and the quality of spot welding is improved.

The invention relates to the technical field of resistance spot welding, in particular to a cement telegraph pole reinforcement cage automatic binding and welding integrated device based on PLC control. The device comprises a working rotating disc rotationally connected with a mounting support, a machining channel allowing the reinforcement cage to horizontally penetrate through is formed in the center of the working rotating disc, a conductive wheel and a pressing assembly are arranged on the same side of the working rotating disc, and the conductive wheel, the pressing assembly and the reinforcement cage form a closed conductive loop. When the diameter of the produced reinforcement cage is small, the axial component force applied to the spiral bar by the cylindrical pressing wheel is guided by the inclined plane of the groove, and forced friction is reduced. When the diameter of a produced reinforcement cage is large and the reset slope of the circular truncated cone pressing wheel presses a spiral bar, the acting direction of force is more deviated to the radial direction, the axial component force is reduced, and therefore the axial friction force is reduced. When the reset slope on the periphery of the round table roll welding wheel is in contact with the spiral rib, an inclined contact line along the conical surface is formed.

The present invention relates to the technical field of laser spot welding machines, and proposes a laser spot welding machine for mold processing, comprising a workbench, a mounting bracket fixed to the rear side of the top wall of the workbench, a No. 1 electric slide rail fixed on the top wall of the mounting bracket, a vertical plate fixed to the top wall of the slider of the No. 1 electric slide rail, a No. 2 electric slide rail fixed to the side wall of the vertical plate, a crossbeam fixed to the side wall of the slider of the No. 2 electric slide rail, a laser spot welding machine body fixed to the front end of the crossbeam, a protective cover is provided on the outer side of the welding head of the laser spot welding machine body, and an air jet collection component, an eye protection component, a translation and lifting component and a purification component are arranged on the workbench; through the above technical scheme, the problem that most welding equipment in the prior art does not have integrated protective gas injection and exhaust gas treatment functions, which will threaten the health of operators and may also pollute the environment, and strong light, ultraviolet rays and infrared rays are generated during welding, and operators are prone to visual damage during the welding process is solved.

The invention relates to the technical field of welding and connection, in particular to a method for improving the mechanical property of an aluminum alloy resistance spot welding joint, which comprises the following steps: preparing active adjuvant paste, placing the adjuvant paste in an extrusion device, coating at the corresponding position of a welding spot through automatic equipment such as a mechanical arm, adjusting corresponding spot welding parameters, and performing resistance spot welding. And forming a spot welding joint. In the resistance spot welding process, the active auxiliary agent added to the interlayer interface of the plate can remove an oxidation film on the surface layer of the aluminum alloy, adjust interface resistance and stabilize current distribution, so that the nugget size and form of a spot welding joint are improved, and splashing is reduced; and meanwhile, the active auxiliary agent reacts in the high-temperature molten aluminum to play roles in purifying melt and refining grains, so that the mechanical property of the aluminum alloy resistance spot welding joint is improved. Under the same test condition, the nugget size of the aluminum alloy resistance spot-welded joint added with the active auxiliary agent is increased by 10%, the grain size is reduced by 10-15%, and the tensile-shear strength of the joint is increased by 15-20%.

The invention discloses an intermediate layer for resistance spot welding of aluminum / steel dissimilar metals and a resistance spot welding method, the intermediate layer is a FeMnCuNi medium-entropy alloy, and the intermediate layer comprises the following components by atomic percent: 20-30% of Fe, 20-30% of Cu, 5-10% of Ni, 5-10% of Ni, and the balance of Fe and inevitable impurities. 20%-30% of Mn; 20%-30% of Cu; the sum of the atomic percentages of all the components is 100%. The method comprises the steps that (1) the aluminum alloy plate and the steel plate serve as welding base materials to be assembled in a lap joint mode, and the middle layer is added to the lap joint area; and (2) through resistance spot welding, a part of the middle layer and the base metal are melted through resistance heat at the lap joint interface, high entropy of nuggets is achieved through atomic diffusion and the high entropy effect, a welding joint with a solid solution as the main part is formed, and the aluminum / steel dissimilar metal composite structure is obtained. Compared with an existing aluminum / steel resistance spot welding technology, high entropy of nuggets is achieved by applying the high entropy effect, generation of brittle-hard phase intermetallic compounds in a welding joint is remarkably reduced, and a high-performance aluminum-steel composite structure is easily obtained.

The application discloses an asymmetric ring electrode cap, discards the traditional two-side uniform spherical electrode design, and adopts an asymmetric ring electrode structure, specifically, the welding end face diameter of a thin plate side electrode cap is 6-14 mm, the curvature radius is 40-100 mm, three rings are arranged, the inner ring is provided with a conical pit, and the middle ring is in the shape of an isosceles trapezoid; the welding end face diameter of a thick plate side electrode cap is not less than that of the thin plate side and not more than 14 mm, the curvature radius is not less than that of the thin plate side and not more than 100 mm, three rings are also arranged, the inner ring is provided with a conical pit, and the middle ring is in the shape of an equilateral triangle. The ring structure parameters of the two electrode caps are accurately designed to adapt to the welding requirements of plates with different thicknesses, and the welding quality and efficiency are improved. The application is particularly suitable for resistance spot welding of materials such as aluminum workpieces with large thickness ratios.

The invention discloses an installation construction method of a large-scale equipment steel structure inclined base plane array type panel, which comprises the following working steps of panel finished product precision compounding, steel structure main body original axis net calculation and fixed point paying-off, steel structure inclined base plane flatness detection and correction theory axis net calculation. The method comprises the steps of modular design, machining, mounting and rechecking of a leveling gasket, machining, mounting and rechecking of a supporting base plate, theoretical axis net calculation of a panel bolt, fine adjustment of a panel, spot welding, tool dismounting and full welding and rechecking of the panel. The method can be used for civil and industrial buildings, and a triple-axis net reference system with a normal vector as a main body framework provides important data support for panel installation and rechecking; dependence on hoisting equipment during installation and construction of the steel structure inclined base area array type panel of large equipment is eliminated, the construction accuracy is improved, manpower, material resources and time input are reduced, the construction cost is effectively reduced, and the construction efficiency is improved.