248 results about "Fusion welding" patented technology

The invention belongs to the technical field of non-woven materials and membrane separation, and particularly relates to a separation membrane supporting body with an interlocking structure and a preparation method thereof.The method comprises the steps that firstly, low-crystallinity and sulfonation-modified superfine polyester fibers are introduced into compact layer slurry, and framework polyester fibers and polyester heat bonding fibers are introduced into framework layer slurry; then forming a double-layer wet net by utilizing a double-flow-channel wet-process net forming device, applying gradient increasing negative pressure on one side of the skeleton layer, and enabling the superfine fibers to migrate from the compact layer to pores of the skeleton layer in a controlled manner by virtue of a viscous dragging effect of directional high-speed water flow on the superfine fibers, so as to form a gradient transition interlocking interface layer; finally, plastic deformation of the low-crystallinity fibers and fusion welding of the bonding fibers are utilized, an interlayer structure is locked through segmented hot pressing of a rough pressing section and a fine pressing section, and then cooling shaping is conducted. The prepared separation membrane support has the advantages of excellent interlayer peel strength, ultralow surface roughness, high air permeability, wide adaptability and high safety of the preparation process.

The invention discloses a method for determining the offset distance of a welding gun of a metal plate welding case lock bottom welding seam and a welding method, and belongs to the technical field of fusion welding technologies. The method for determining the offset distance of the welding gun comprises the steps that the machining side welding thickness L1, the metal plate side welding thickness L2 and the bottom locking thickness L3 of the metal plate welding case are obtained, and the axis offset P of a welding gun tungsten electrode and the center of a welding connector is calculated; based on the axis offset P, the opposite position of a welding gun tungsten electrode is determined, the offset angle theta over a welding bead and the diameter phi A of the welding bead are obtained, and the offset distance L between the opposite position of the welding gun tungsten electrode and the position over the welding bead is calculated; and based on the axis offset P of the welding gun tungsten electrode and the center of the welding joint and the offset distance L between the position right opposite to the welding gun tungsten electrode and the position right above the welding bead, the alignment position line of the tip end of the welding gun tungsten electrode is determined at the workpiece welding joint. The welding method comprises the steps that the position of the circumferential automatic welding gun mechanism is adjusted based on the alignment position line, and a welding gun is located in the welding bead upslope direction in the circumferential direction.

The invention discloses an ultrasonic-annular water cooling synergetic thermosetting composite material repairing method and equipment, on the basis of coaxial annular water cooling, an annular cooling cavity with a variable contour and a structural design of a closed ring with a plane contour which can be circular, elliptical, waist-circular or polygonal are introduced, so that the inner side contour of a cooling ring can be more attached to a welding area. For a large-size or irregularly-shaped thermosetting matrix component repaired by adopting ultrasonic local fusion welding, the cooling zone can be tightly attached to the outline of a welding interface in the circumferential direction through the design, heat is effectively prevented from overflowing along a complex boundary, compared with a fixed circular or linear cooling structure, the range of a heat affected zone can be further narrowed, and the service life of the component is prolonged. And a high-temperature area in the thermosetting matrix is more limited near a welding interface, so that the overall temperature of the thermosetting matrix is always lower than the glass-transition temperature while sufficient melting and flowing of the thermoplastic patch are ensured, and resin degradation and interface strength attenuation caused by local overheating are avoided.

The invention discloses a glass packaging device and method, and relates to the technical field of glass packaging. The device comprises a sealing cover shell, a conveying mechanism, a vacuumizing mechanism, a welding mechanism and a mechanical arm, a closed environment is formed through the sealing cover shell, the vacuumizing mechanism exhausts internal air, the welding mechanism conducts high-temperature fusion welding on the edge of laminated glass, and the mechanical arm clamps a pressure clamp to maintain the attaching state of the glass after welding. According to the method, the processes of feeding, vacuumizing, welding, pressurizing, annealing and discharging are executed by adopting the device. According to the scheme, oxidation pollution in the welding process is effectively reduced through a fully-closed environment and automatic control, the sealing strength and airtightness are improved, the packaging quality stability is guaranteed, and the method is suitable for the field of manufacturing of high-end photoelectric and vacuum devices.

The invention discloses a fail-safe automatic unhooking charging system for a battery charging grid, which relates to the technical field of battery charging and comprises a charging state detection module, a fault contact subdivision module, a controlled current reduction selection module and a mechanical unhooking execution module. The charging state detection module collects multi-dimensional charging state parameters, and when the parameters exceed a threshold value, it is judged that a suspected fusion welding fault exists, and a suspected polarity set is generated; the fault contact subdivision module multiplexes an acquisition link to obtain a contact arc correlation signal and a temperature change rate, and judges a single-pole or double-pole fusion welding type; the controlled current reduction selection module calculates a current reduction coefficient and a target near-zero current according to the fault type, and executes hierarchical controlled current reduction; the mechanical unhooking execution module executes an unhooking action, verifies a result through an auxiliary contact and an electrical parameter, and triggers secondary isolation when the result fails; according to the invention, the problem of unhooking failure caused by contact fusion welding is effectively solved, and the system safety is improved.

The invention discloses an anti-rebound strong-breaking high-voltage direct-current relay, and the relay comprises a static assembly which is disposed in a relay housing, is used for forming a static conductive and magnetic circuit foundation of the relay, provides a second section of counterforce in the pull-in process of the relay, inhibits the pull-in rebound of a contact, and assists in enhancing the breaking force during breaking. And the movable assembly is arranged in the relay shell and is used for realizing dynamic on-off actions of the contacts. According to the invention, the three-section counter-force design is optimized and combined with the tower-shaped spring, so that the collision energy and bounce of the movable contact can be reduced, the arc generation and the component loss are reduced, and the bonding risk is reduced; breaking force is provided through the synergistic effect of the main spring, the counter-force spring and the magnetic steel, the contact can be assisted to be rapidly separated, and therefore fusion welding is overcome, arc extinguishing is accelerated, and contact damage is reduced. Through the magnetic steel directional polarity and closed magnetic circuit design, the magnetic field intensity can be enhanced, the pull-in response time can be shortened, and the magnetic leakage can be reduced, so that the pull-in force and the holding force can be enhanced, and the contact looseness can be avoided.

The invention provides a silver-nickel-titanium electric contact material and a preparation method thereof. By adopting a nickel-titanium alloy material as a main additive, the welding resistance of the electric contact material is improved while the good machinability of the material is maintained. NiTi is introduced as a main additive to be added into an Ag matrix to improve the fusion welding resistance of the material, meanwhile, a small amount of trace copper is also added to mainly improve the wettability of the material, and the C powder and the titanium carbide powder improve the fusion welding resistance of the material. In addition, a powder metallurgy process is adopted, material proportion is easy to control, process flow is short, and cost is low. The rapid plasma electric spark sintering speed is high, the time is short, and the material density is high.

The invention relates to the technical field of high-voltage electric appliance switch equipment, and discloses a high-safety vacuum circuit breaker for power distribution control equipment, which comprises a vacuum circuit breaker body and a movable frame for bearing the vacuum circuit breaker body, the vacuum circuit breaker body comprises a solid-sealed polar pole main body, the solid-sealed polar pole main body is provided with an upper transverse outlet and a lower transverse outlet, and plum blossom contacts are arranged at the transverse outlets; a vacuum tank and an inner sealing cylinder positioned below the vacuum tank are packaged in the solid-sealed polar pole main body; an insulating transmission sleeve is arranged in the inner sealing cylinder, and an insulating transmission rod inner core is movably arranged in an inner cavity of the insulating transmission sleeve in a penetrating mode. The wax type temperature sensing bulb is arranged in the conductive arm base, the kick type diaphragm is used as a trigger medium, a direct linkage relation between the contact temperature and mechanical locking is established, contact fusion welding, arcing or explosion accidents caused by forced switching-out are effectively prevented, and the operation and maintenance safety of power distribution equipment is improved.

The invention discloses a silver-saving type AgSnO2In2O3 contact material and a preparation method of the silver-saving type AgSnO2In2O3 contact material, and belongs to the technical field of silver-based contact materials. The preparation method of the contact material comprises the following steps: firstly, performing high-energy ball milling on specially prepared ITO conductive ceramic powder and ATO conductive ceramic powder according to the mass ratio of 1: 1 to obtain ITO. ATO composite conductive ceramic powder, and performing ball milling on the obtained ITO. ATO composite conductive ceramic powder and AgSnCu alloy powder according to the mass ratio of 100: 12-100: 16; and carrying out isostatic compaction, oxidation, sintering and extrusion on the obtained AgSnO2In2O3 composite powder containing the composite conductive ceramic reinforced phase to obtain the AgSnO2In2O3 composite powder containing the composite conductive ceramic reinforced phase. The contact material prepared according to the method is low in resistivity and high in welding resistance, and the purpose of saving silver can be achieved.

The invention relates to the technical field of electrofusion joints, in particular to a polyethylene pipeline electrofusion welding joint. The connector comprises a main body, two connectors are symmetrically installed at the two ends of the main body, and a positive electrode and a negative electrode are arranged in the connectors respectively. An annular groove is formed in the inner side of the main body, a welding sleeve made of a polyethylene material is clamped in the groove, and a convex ring protruding inwards is arranged in the center of the inner wall of the welding sleeve; a resistance wire which is spirally distributed is coaxially laid in the welding sleeve, and the resistance wire is embedded in the sleeve wall of the welding sleeve; connecting wires are led out of the two ends of the resistance wire towards the outside of the welding sleeve in the same direction and are respectively connected with the positive electrode and the negative electrode; a plurality of heat-resistant insulating rods which are uniformly arranged at intervals are also embedded in the welding sleeve, extend in the axial direction of the resistance wire and are fixedly connected with the outer side surface of each circle of the resistance wire; the section of the resistance wire is rectangular, and the inner side face of the resistance wire is parallel to the inner side face of the welding sleeve. The heating device is uniform in heating.

The utility model discloses a heating plate device for a fusion sealing welding cover of an infusion bottle, which relates to the technical field of heating plates, and comprises two heating plate bodies consisting of a shell, a heating element and a heat dissipation component, one side of each heating plate body is connected with a connecting wire, and the rear side of each heating plate body is provided with an auxiliary component; and a connecting plate arranged on the rear side of the heating plate body is arranged in the auxiliary assembly, a groove is formed in the bottom end of the connecting plate, and rotating pipes are symmetrically and rotationally arranged on the inner wall of the groove. According to the utility model, through the arrangement of the auxiliary assembly, a plurality of heating plates can be installed or the number of the heating plates can be reduced according to the polypropylene infusion bottles with different sizes, so that the polypropylene infusion bottles with different specifications and bottle caps can be heated and sealed, and meanwhile, the heating plates are connected in parallel and are respectively provided with a branch switch; therefore, the specified heating plate can be used according to the height of the bottle opening of the polypropylene infusion bottle, and the polypropylene infusion bottle and the bottle cap can be heated and sealed conveniently.

The utility model relates to a high-speed cable transfer laser welding fixing structure, which is characterized in that at least one grounded base is fixed on a PCB (Printed Circuit Board), an upper cover is arranged on each base, a plurality of compartments which are distributed in rows and are independent from one another are arranged on the base in a cover sealing area of the upper cover, two signal bonding pads are arranged in an area enclosed by each compartment on the PCB, and the signal bonding pads are arranged on the PCB. Two wire clamps which are respectively welded with the two signal bonding pads are arranged in each compartment, and two signal wires of each high-speed cable are respectively and horizontally welded with the two wire clamps in one compartment on the base after the protective layer is stripped; the upper cover, the base, the ground wire exposed in the high-speed cable and the copper / aluminum foil exposed in the high-speed cable are welded in a laser welding mode. The fixing structure has the beneficial effects that the fixing structure does not need dispensing, so that the problem of impedance increase caused by excessive dispensing does not need to be considered, the performance of the high-speed optical module is not influenced, the signal line does not need to be bent, and stress is prevented from being generated.

This invention relates to the field of fuse technology and discloses an intelligent electric drop-out fuse, comprising a support assembly, the support assembly including an insulating support, a fixing member fixedly connected to one side of the top of the insulating support, a moving contact piece fixedly connected to the inner side of the top of the fixing member, a solenoid coil electrically connected to the top of the moving contact piece, a fuse tube assembly mounted at the bottom of the moving contact piece, and a self-cleaning assembly fixedly connected to one side of the top of the fuse tube assembly, the self-cleaning assembly including a mounting plate, a slider mounted on the top of the mounting plate, and a scraper fixedly connected to the top of the slider. When the solenoid coil is energized, it generates a magnetic field, eliminating contact welding. The fuse tube assembly releases air, releasing the locking block and allowing the scraper to contact the contact. The self-cleaning mechanism, combined with the drop-out of the fuse tube assembly, prevents the fuse from failing to drop due to welding of the moving contact piece. The angle between the scraper and the top of the slider is between 60-75°, avoiding the problem of the fuse failing to drop due to welding of the moving contact piece.

The invention relates to the field of titanium alloy machining, and discloses a titanium alloy construction forming method and a component. The method comprises the steps that at least two titanium alloy base material units are machined into a component with multiple stages of bosses; the two components are arranged on the clamping mechanism in the mode that the end faces, with the multi-stage bosses, of the two components are opposite, and the centers of the two components are aligned; the two components are in butt joint under the protective atmosphere and are subjected to friction welding, so that the multi-stage bosses of the components are in solid-phase connection layer by layer; and diffusion annealing treatment is conducted on the welded formed part. According to the method, a multi-stage boss structure is arranged at the welding end of the component, the initial contact area of friction welding is remarkably increased, heat-force distribution is improved, and the method is the key for achieving solid-state additive manufacturing of the high-quality and large-size titanium alloy component; according to the method, the units are combined in a solid-phase connection mode of friction welding, and the welding defects of traditional fusion welding are effectively overcome.

The invention discloses a high-voltage direct-current relay capable of enhancing anti-short-circuit capability, which comprises a relay shell, a static assembly and a coil assembly, the coil assembly and the static assembly are arranged in the relay shell, and the high-voltage direct-current relay also comprises a movable assembly which is arranged in the relay shell and is used for realizing dynamic adjustment of a gap between magnetic conductive blocks, and the impact stress when the contact is closed can be reduced. The movable assembly comprises a fixed seat, a fixed frame is connected to the fixed seat, an upper magnetic conductive block is connected to the fixed frame, and a lower magnetic conductive block is connected to the fixed seat through a main spring. The elliptical hole of the supporting elastic sheet is in sliding fit with the convex hull of the lower magnetic conductive block, so that the gap between the magnetic blocks can be reduced, the magnetic circuit efficiency is improved, the contact closing impact can be reduced, and bounce is reduced; through the limiting cooperation of the convex hull of the movable contact spring and the groove of the lower magnetic conductive block and the four-point symmetrical supporting spring, the gap between the magnetic blocks can be prevented from being increased, the suction of the short circuit ring is maintained to be stable, the balanced stress can prevent deflection, and the fusion welding risk of the contact is reduced.

The application discloses a kind of hollow glass brick processing with fusion welding machine and process, it is related to the technical field of glass product manufacturing, wherein, a kind of hollow glass brick processing with fusion welding machine, including support frame, setting in support frame's fusion welding platform, the upper clamp and lower clamp of symmetrically setting up and down, plugboard assembly, air extraction equipment, gas supply equipment and sealing assembly;Upper clamp and lower clamp are respectively driven by power device to press together upper concave glass half billet and lower concave glass half billet;Plugboard assembly is set to the joint between upper clamp and lower clamp and can be inserted into the vacuum cavity formed by upper concave glass half billet and lower concave glass half billet.This application can complete the vacuumization and the filling of inert gas inside vacuum cavity simultaneously at the moment of upper concave glass half billet, lower concave glass half billet fusion welding combination, and realize the long-term stable sealing of vacuum cavity internal environment, to simplify production process and improve the functionality of glass brick.

The utility model provides laser fusion welding filter element framework welding equipment, which relates to the field of filter element processing and manufacturing and comprises an equipment main body, a case arranged at the bottom of the equipment main body, a protective door arranged on the outer side of the equipment main body, a sliding rail arranged in the equipment main body, a fixing module arranged at the top of the sliding rail, and a welding module arranged at the top of the fixing module. By the adoption of the fixing module, an electric control device on the fixing module controls an inserting block to be clamped and fixed towards a downward inserting groove, a filter element framework is placed on a rotary sleeve and can rotate according to parameters input by an electric control system and an external control system, and the rotating speed is made to be consistent with the welding speed; and the welding efficiency and integrity are guaranteed.

1. The name of the design product: laser fusion welding machine. 2. The use of the design product: for the fusion of optical fiber and optical fiber, end cap and optical fiber. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The present invention provides a method for preparing a weld specimen with a crack, which relates to the technical field of weld specimen preparation. The method comprises the following steps: S1: Process the bevels at the welding ends of two base metals. The main weld is located between the two bevels, and the two base metals are welded at the main weld; S2: Process a first groove on the outer side wall of the base metal, and the first groove penetrates through the main weld; S3: Weld in the first groove to form an induced layer; S4: Process a second groove on the surface of the induced layer, and perform welding in the second groove by means of fusion welding. After welding, perform a cooling treatment to generate cracks; S5: Complete the welding of the cover layer of the main weld, and cover the crack inside the welding material during welding. By adopting the present invention, the crack morphology is realistic, and the position and depth of the crack are easy to control during the preparation process. It can be detected and verified in ultrasonic testing to ensure the reliability of the simulation test results. Compared with the fatigue loading method, this method effectively saves the production cost and time of cracks.

The utility model discloses a kind of multi-grade adjustment rotary switches, including base, shell cover, rotating handle and contact assembly, rotating handle rotationally arranged between base and shell cover, and drive rod extending along its radial direction is provided;Contact assembly includes the multiple elastic structure's moving contact bridge of the shaft center of rotating handle as center annularly arranged in installation cavity, and multiple static contact pieces are arranged in base and respectively opposite multiple moving contact bridges, multiple moving contact bridges are connected and respectively located on the movement path of drive rod, drive rod respectively drives multiple moving contact bridges and multiple static contact pieces contact in rotating handle rotating process, by the mechanism of the wheel contact formed by drive rod and multiple moving contact bridges, operation pressure is significantly dispersed, avoid single moving contact bridge sustained stress, greatly reduce the mechanical load and fatigue degree of moving contact bridge, reduce the probability of heating, reduce wear and risk of fusion welding, extend mechanical service life.

This invention discloses a welding system for an automotive tubular beam assembly, belonging to the field of automotive laser welding technology. It includes a welding table for laser welding an outer tubular beam and an inner tubular beam. The welding table has an inner tubular beam support welding module, a welding working surface module, and a spin adjustment module arranged horizontally in sequence. A workstation scaffold is located on one side of the welding table, and a combined fusion welding module is connected to the workstation scaffold via a hydraulic device. The inner tubular beam support welding module includes a support base mounted on the welding table, with clamping openings on the support base. This invention achieves synchronous downward movement of the combined fusion welding module, which drives the inner expansion component and electromagnetic pressure plate to press down synchronously. Multiple synergistic effects between the inner and outer tubular beams, through the inner expansion component squeezing the inner tubular beam, ensure a tight fit between the inner and outer tubular beams. Combined with laser welding and fusion welding, this effectively eliminates defects such as incomplete welds and porosity, resulting in a uniform and strong weld formation and significantly improved welding strength.

The invention discloses an interface fusion welding method and equipment, and belongs to the technical field of diffusion welding. The problem that in the metal diffusion welding process, in order to form tight interface contact, external pressure is excessively relied on, and consequently the deformation amount of base metal is large is solved. And meanwhile, the problem that the temperature of a welding interface is not uniform in traditional welding is solved. The method comprises the following steps: polishing the high-temperature alloy until no obvious scratch exists on the surface, sequentially carrying out ultrasonic cleaning with acetone and absolute ethyl alcohol, and drying; fixing the sample on a sample table of a magnetron sputtering device, vacuumizing, introducing inert gas, carrying out magnetron sputtering on nickel and aluminum at the same time, and then carrying out magnetron sputtering on silver; then, placing in absolute ethyl alcohol for ultrasonic cleaning, placing in a NaOH solution, heating in a water bath for immersion cleaning, and washing with deionized water; then, putting into an HCl solution, carrying out immersion cleaning, washing with deionized water, carrying out ultrasonic cleaning with absolute ethyl alcohol, and drying; and then laminating the plated surface, and performing magnetic field-assisted induction heating diffusion welding. Small-deformation and high-quality diffusion welding of metal at a relatively low temperature is achieved.

1. Name of the product in this design: Laser Servo Pressure Welding Gun. 2. Purpose of this design: For laser welding, to solve the problems of part gaps and laser safety protection. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The utility model discloses a kind of precision double-station turntable high-frequency machine of multi-angle welding, it is related to high-frequency machine technical field, including rack shell, one end of rack shell top is fixedly connected with first mounting bracket, and the end of first mounting bracket is fixedly connected with lifting assembly, and welding assembly is installed in the below of lifting assembly;The lifting assembly includes the support cross plate fixedly connected with first mounting bracket, and the support cross plate is fixedly connected with extrusion cylinder;The utility model, lifting cylinder promotes mobile connecting plate to move upwards, to make the gearbox on mobile connecting plate promote workbench to move upwards, make the positioning protrusion below workbench separate from positioning plate, after the both ends of workbench are adjusted, lifting cylinder drives mobile connecting plate to move downwards, until the positioning protrusion below workbench is inserted into corresponding slot on positioning plate, to position workbench, prevent from appearing deviation in plastic product welding process, improve the precision of fusion welding.

The invention relates to a laser firing mask (20m) for a laser welding unit (20) of a laser welding interconnection device for photovoltaic cells (4) to form at least one string of photovoltaic cells (4) interconnected by connecting conductors (6), characterized in that it comprises a plurality of laser firing points (22) through which at least one laser shot is capable of being performed for the local fusion welding of at least one connecting conductor (6) positioned on the front face (4a) or the rear face (4b) of at least one photovoltaic cell (4), each laser firing point (22) being hollow and having a conical opening (22o). Figure for the abstract: Figure 1

This application discloses a high-weld-resistance copper-chromium contact and its preparation method, belonging to the field of contact material technology. The preparation method includes: using high-purity electrolytic chromium powder and electrolytic copper powder as raw materials, mixing them via acoustic resonance, and then sequentially passing them through powder pressing and cold isostatic pressing to obtain a blank; subjecting the blank to gradient sintering and finishing to obtain a copper-chromium electrode rod; then atomizing the copper-chromium electrode rod to obtain copper-chromium alloy powder; sequentially passing the copper-chromium alloy powder through cladding, heat treatment, sealing welding, and hot isostatic pressing sintering, and then removing the cladding to obtain a preform; after processing the preform, remelting the surface with a green laser to obtain a high-weld-resistance copper-chromium contact. This method improves the purity of the copper-chromium contact and optimizes the morphology and distribution of chromium particles, resulting in a contact with high purity, fine and uniformly distributed chromium particles, excellent weld resistance and breaking performance, suitable for high-voltage arc-extinguishing chambers.

The invention relates to tempered welded glass and a preparation method thereof. The tempered fusion welding glass comprises fusion welding glass subjected to tempering treatment, the fusion welding glass comprises a first glass body and a second glass body, the first glass body and the second glass body are connected through a fusion welding face, and the first glass body and the second surface of the second glass body are subjected to fusion welding through a first surface to form the fusion welding face. The area of the first surface is larger than that of the second surface; the absolute value of the difference between the welding temperature of the first glass body and the welding temperature of the second glass body is 0-200 DEG C, the thermal expansion coefficients of the first glass body and the second glass body are alpha 1 and alpha 2 respectively, and 0.2 * 10 <-6 > / K < = alpha 1-alpha 2 < = 1.0 * 10 <-6 > / K. According to the tempered welded glass, the pressure stress relationship is pre-constructed in the welded glass, so that the pressure stress is propped against the pulling stress generated by tempering expansion in the tempering process, and the obtained tempered welded glass is high in mechanical strength and good in consistency of the mechanical strength.

The application relates to the technical field of silicon-based MEMS sensor, in particular to a silicon piezoresistive pressure sensor with rigidly packaged sensitive chip and a manufacturing process, which comprises a stainless steel pipe seat, a metal pressure guide column suspended on the stainless steel pipe seat, a silicon piezoresistive pressure sensitive chip fixed at the top end of the metal pressure guide column and a metal wire, the silicon piezoresistive pressure sensitive chip is electrically connected with the stainless steel pipe seat, a pipe seat electrode pad is arranged on the stainless steel pipe seat, and the outer welding opening at the bottom end of the metal pressure guide column and the inner cavity bottom end welding opening of the stainless steel pipe seat are fusion welded into an alloy welding seam; the silicon piezoresistive pressure sensitive chip sequentially comprises a glass lining piece, a peak film pressure sensing diaphragm, a diffused silicon sensitive bridge resistor, a diffused silicon connecting wire, a diffused silicon homogenous pad, a metal film pad and a diffused silicon temperature sensing resistor from bottom to top. Through the cooperation of the above structure, the elastic characteristics of the silicon piezoresistive pressure sensitive chip, such as no hysteresis, high fatigue life and small static pressure influence, are continued, and the positive pressure overload capacity of the pressure sensor is also improved.

A metal inert gas arc welding process in which a multi-wire welding torch (40) is mechanized along a path to execute a predetermined weld seam on a workpiece (32, 100a, 100b, 101a, 101b), and in which a first arc (51) is generated between a first consumable wire electrode (50) and the workpiece, and a second arc (61) is generated between a second consumable wire electrode (60) and the workpiece to transfer wire electrode material into a weld pool, wherein the first wire electrode (50) is supplied by a first power source (4) and the second wire electrode (60) by a second power source (6), and at least a third wire (70) is fed directly into the weld pool, wherein the first and second wire electrodes (50, 60) and the third wire (70) are guided in the multi-wire welding torch (40) such that the wires exiting the multi-wire welding torch (40) (50, 60,70) essentially lie in a common plane (GE) and that in the common plane the first wire electrode (50) and the second wire electrode (60) form an angle of equal magnitude with opposite signs to the third wire (70), characterized in that, during the execution of the metal inert gas arc welding process, starting from a predetermined direction of movement of the multi-wire welding torch (40) to the path line, the multi-wire welding torch (40) is moved backwards on the path line without rotation of the multi-wire welding torch (40) to perform a reversal of movement, and with the beginning of the backward movement of the multi-wire welding torch (40), the third wire (70) is initially not fed into the weld pool, and thereafter, in a transition phase, a current source (5) of the third wire (70) is supplied starting from a predetermined initial operating value of at least one process parameter current,Voltage and feed rate are controlled to a predetermined steady-state operating value of at least one process parameter.

The application discloses a preparation method of an electric contact material and an electric contact, and the preparation method comprises the following steps: adding a graphene oxide dispersion solution into a target dispersion solution to uniformly disperse, so as to obtain a graphene composite material; the target dispersion solution comprises nano copper oxide powder, nano lanthanum oxide powder and a surfactant; the graphene composite material is subjected to removal and reduction treatment, so as to remove the surfactant in the graphene composite material, and a reduced metal composite material is obtained; the metal composite material comprises graphene, copper, copper oxide and lanthanum oxide; the metal composite material is subjected to ball milling treatment, so as to obtain an electric contact composite material containing lanthanum oxide and graphene. According to the embodiment of the application, the lanthanum oxide and the graphene can be uniformly dispersed, so that the electric conductivity and the anti-welding performance of the electric contact material are effectively improved.