433results about How to "Improve welding strength" patented technology

The invention provides an ultrafast laser welding method and device for large-spacing heterogeneous materials. The ultrafast laser welding method specifically comprises the steps that a lower workpiece and an upper workpiece are stacked and clamped through a clamp; a laser beam is collimated, then enters a scanning galvanometer and is focused through a field lens after being emitted, first scanning laser energy is absorbed by a lower-layer material to generate plasma, the plasma continuously expands and overflows, meanwhile, the lower-layer material is melted to fill a gap, and the quasi-optical contact condition is achieved; free expansion of plasmas in second scanning is effectively inhibited, laser energy is limited near a welding seam, the melting volume of the area is remarkably increased, and the welding strength is remarkably improved; and the third scanning and the second scanning are consistent in mechanism, the material melting amount is increased, and finally welding head strengthening is achieved. Through the scanning galvanometer and the field lens, a focusing light spot moves along a specified route in the contact surface of the upper and lower workpieces, so that the workpieces are melted and combined. After three times of scanning, the large-spacing heterogeneous material can finally obtain a high-strength and high-quality welding joint.

The invention discloses a transparent material / metal dissimilar material ultrafast laser welding method based on a burst mode, and belongs to the technical field of laser micro-nano machining, and the transparent material / metal dissimilar material ultrafast laser welding method comprises the steps that the surface roughness and flatness of a pre-welded piece are treated through a mirror grinding and polishing technology, so that a sample piece reaches the optical contact condition, the pre-welded piece is in lap joint with a tool platform through a specially-made clamp, and the pre-welded piece is welded to the tool platform; when a visual Newton ring appears on a contact surface and an ultrafast laser focus is located at a material interface, using a burst mode under an ultrafast laser processing platform to increase the number of sub-pulses, welding a micro-area, equally dividing the energy of a single pulse into a plurality of pulses, and then emitting light in a pulse sequence mode, by using the burst mode containing multiple pulses, the heat accumulation effect can be achieved more easily, the ablation efficiency and the connection strength and stability of the transparent material and the metal heterogeneous material are improved while the machining rate is increased, and the method has wide application prospects.

The invention discloses vacuum glass and a preparation method thereof. The preparation method comprises the following steps: grinding corners on one sides of the back surfaces of two glass sheets to form notches; tempering the two glass sheets, coating the outer edges of the back surfaces of the glass sheets with a first solder, and forming a notch; combining the two glass sheets; sealing the two glass sheets for the first time after the two glass sheets are combined; a getter is placed in the cavities of the two glass sheets through the notches in the sealing frame; sintering the second welding flux to form an inlaying piece and inserting the inlaying piece into the notch, wherein one end of the inlaying piece is arranged towards the cavity; elastic pressurizing devices are mounted on the two glass sheets, and the elastic pressurizing devices elastically abut against the other ends of the inlaying pieces; and sequentially carrying out vacuumizing and secondary sealing on the two glass sheets, so that vacuum is formed in the cavity, and the second welding flux is molten to seal the notch. The invention solves the problem that the solder at the vacuum lower edge part is easy to foam when being heated at high temperature in the existing vacuum glass preparation method.

The invention belongs to the technical field of welding, and discloses a dissimilar metal power modulation galvanometer laser welding method which comprises the following steps: finely cleaning a 6061 aluminum alloy and a 304 stainless steel plate by using acetone, and then airing for more than 20 minutes; the aluminum steel sheet is assembled, pressed and fixed on a welding test platform in a steel-up-aluminum-down mode; the position of the welding test platform is adjusted, argon serves as welding protection gas, and a protection gas nozzle is arranged to be aligned with a welding pool area; laser welding parameters are set, a laser power modulation mode is set to be a gradient power mode, and the gradient power mode is to regulate and control phase point laser power in a circular scanning track in the advancing direction of a welding seam; a welding test is carried out in the mode that a galvanometer laser head is fixed and a welding test platform is moved, and a laser and the welding test platform are synchronously started and stopped; and the protective gas is started 5 seconds before the laser is started, and after the laser is stopped, the protective gas is stopped lagging for 10 seconds so as to continuously protect the welding seam and prevent oxidation.

This invention relates to the technical field of welding equipment, and in particular to a welding machine for valve assembly, comprising a main ring, a base, a slide, clamping plates, and welding rods. The main ring has a horizontal axis and rotates around its own axis. The base is fixed on the main ring and rotates synchronously with it. The slide is slidably mounted on the base in a direction perpendicular to the axis of the main ring. Both clamping plates are mounted on the slide. By inserting the welding rod into the gap between the flange and the valve body for welding, the welding strength and quality of the mating surfaces can be effectively improved, enabling comprehensive and effective welding of the valve and improving the valve processing quality. The main ring drives the welding rod to perform circular motion, and the slide moves on the base and feeds the welding rod, realizing an automatic welding process and improving production efficiency.

The utility model relates to the technical field of battery manufacturing, and particularly discloses a battery, a battery pack and a power utilization device. The battery comprises a cover body and a shell, the cover body is welded to an opening of the shell and forms a welding seam, a reinforcing boss is arranged in a heat affected zone of the welding seam on the inner wall of the shell, and the reinforcing boss is continuously arranged along the circumferential surface of the inner wall of the shell. According to the invention, the reinforcing boss is additionally arranged in the heat affected zone, which is a certain distance away from the weld joint, of the side wall of the shell, so that the position of the side wall of the shell is thickened and reinforced, the welding strength is effectively improved, and the situation that the area is fragile and cracks before the anti-explosion valve to cause heat diffusion when the battery cell is subjected to emergencies such as thermal runaway and the like is avoided. According to the battery, the welding reliability of the cover body and the shell is improved, and the safety performance of the battery under special conditions is enhanced, so that the production yield is increased, and the production cost is reduced.

The utility model relates to the technical field of cutting equipment, and discloses cutting equipment for sports equipment metal pipe fittings, which comprises a conveying support frame, a feeding device and a laser cutting device, the conveying support frame and the feeding device are matched to limit and convey the metal pipe fittings, and the metal pipe fittings are cut through the laser cutting device. A limiting groove is formed in the top of the conveying supporting frame, a limiting frame is further fixedly connected to the top of the conveying supporting frame, the axis of the limiting frame and the axis of the conveying supporting frame are collinear, and a through hole matched with the limiting groove is formed in the bottom of the limiting frame. According to the cutting equipment for the sports equipment metal pipe fitting, the rotating base is arranged at the top of the conveying supporting frame, the laser cutter supporting frame is driven by the rotating base to enable a laser cutter installed on the laser cutter supporting frame to move in an arc-shaped track, and therefore when the metal pipe fitting is cut, the laser cutter can be driven by the laser cutter supporting frame to move in the arc-shaped track; and the cut part of the metal pipe fitting is provided with an arc surface, so that a groove formed by the arc surface is attached to the outer surface of the metal pipe during welding.

The invention provides a core pack, a battery and a battery pack, the core pack comprises a pole piece assembly, the pole piece assembly comprises a plurality of pole pieces, and each pole piece comprises a tab; wherein the plurality of tabs are welded to form a welding printing area, the height of the folded tabs is H1, and the height of the welding printing area is H2; the core package is further provided with two opposite side faces in the thickness direction, the distance between the welding printing area and the side faces is D, the thickness of the core package is d, and 0.42 < = arctan ((H1-H2) / (d-D)) / arctan ((H1-H2) / D) < = 1.

The invention discloses a high-quality laser welding manufacturing device and a high-quality laser welding manufacturing method, which solve the problems of concentrated energy distribution, small inherent focal depth, insufficient depth-diameter ratio of welding and insufficient welding thickness of the existing ultrafast laser welding technology. The zoom collimation system, the cone mirror, the acousto-optic modulation unit and the long focal depth compression unit are sequentially arranged on a light path where the welding laser is located in the emergent direction of the welding laser. The zoom collimation system is used for changing the spot diameter of the welding laser and collimating the spot diameter; the cone mirror is used for shaping the welding laser subjected to diameter-variable collimation into long-focal-depth laser; the acousto-optic modulation unit divides the long-focal-depth laser into N sub-beams and adjusts the spatial position of each sub-beam, and N is a positive integer greater than or equal to 1; and the long focal depth compression unit is used for adjusting the spot diameter and focal depth length of each sub-beam, so that the focal position and energy of each sub-beam are suitable for laser welding.

The invention discloses an aluminum alloy large-gap MIG welding method which comprises the following steps: firstly, determining the thickness position and the welding direction of a fillet weld of a to-be-welded workpiece, determining welding current according to the thickness of the to-be-welded workpiece, and continuously heating a molten pool by adopting a delay staying method in an arcing stage; s2, in the welding stage, switches of the robot and the MIG welding machine are turned on, and a MIG welding gun walking path program carried by the welding robot is compiled; an MIG welding gun carried by the robot swings in a Z shape and swings back and forth, a double-pulse scheme is adopted in the welding process specification, according to the welding current scheme, the welding current is determined according to the thickness of the aluminum alloy, the welding parameter of welding swing in the forward direction is small current, and the welding parameter of welding swing in the backward direction is large current; and after swinging of the welding gun is finished, the welding gun continuously moves for a certain distance, and the welding gun moves to a welding end point. Effective welding can be achieved under the working conditions of different thicknesses and large gaps, and the welding quality is improved.

The invention relates to a packaging electrode, a manufacturing method thereof and a semiconductor packaging device. The manufacturing method comprises the steps that a diamond composite metal base layer is prepared, a first alloy layer and a second alloy layer are formed on the upper side surface and the lower side surface of the diamond composite metal base layer respectively, and a conductive flange is formed on the side wall of the diamond composite metal base layer; the diamond composite metal base layer, the first alloy layer, the second alloy layer and the conductive flange are of an integrated structure. The surfaces, deviating from the diamond composite metal base layer, of the first alloy layer and the second alloy layer are machining surfaces and are used for being in direct contact with a chip; the flange welding surface of the conductive flange is free of diamond composition. According to the invention, the forming quality and performance of the large-size packaging electrode can be improved, so that the packaging reliability of the semiconductor packaging device can be effectively improved.

The invention provides an optical fiber penetration piece which comprises a penetration main piece, the penetration main piece is used for penetrating through an equipment shell, the penetration main piece is of a hollow structure with two open ends, the two open ends of the penetration main piece are respectively provided with a sealing assembly, and the sealing assemblies are provided with a plurality of through holes for armored optical fibers to pass through. The armored optical fiber comprises an optical fiber body and a protective sleeve, the optical fiber body is metalized, the protective sleeve is of a gold-plated structure, and the metalized optical fiber body is welded and connected with the gold-plated protective sleeve at the two ends of the protective sleeve through tin-antimony solder or tin-gold solder. The tin-antimony solder or the tin-gold solder has relatively low welding temperature, so that thermal damage to the optical fiber body can be reduced, the optical fiber body is prevented from being damaged due to overheating, and continuity and high quality of signal transmission are maintained; meanwhile, the tin-antimony solder or the tin-gold solder has good flowability and wettability and can be uniformly distributed at the connecting part of the optical fiber body and the protective sleeve, so that damage to the optical fiber body caused by local stress concentration is avoided.

The invention relates to the technical field of automobile bumper beam assembly manufacturing, in particular to automobile bumper beam assembly automatic welding equipment and a welding method.The automobile bumper beam assembly automatic welding equipment comprises a base, a clamp base is fixedly installed on the upper end face of the base, and welding mechanical arms which are located in front of the clamp base and are in bilateral symmetry are fixedly installed on the upper end face of the base; and a bearing mechanism is arranged on the clamp seat. A comprehensive operation model of bearing, limiting and aligning is adopted for completing rapid welding after integrated clamping and fixing of the automobile bumper beam and the energy absorption box, firstly, the position of the beam is accurately corrected through cooperation of abutting limiting and internal expansion on the upper end face and the lower end face of the beam, and it is guaranteed that the beam and the energy absorption box are accurately aligned; and meanwhile, the overall stability is enhanced through supporting of a trapezoidal structure, vibration and deformation in the welding process are reduced, and deformation caused by thermal stress is avoided, so that uniformity and consistency of welding seams are achieved through mutual cooperation of mechanisms, the overall welding quality and strength are remarkably improved, and the production efficiency of the automobile bumper beam assembly is improved.

The invention relates to inductance coil welding equipment. The inductance coil welding equipment comprises a feeding system, a solid-state welding device and a laser welding device; the laser welding device is arranged behind the solid-state welding device, the feeding system is used for sequentially conveying an inductance coil and a guide piece to the solid-state welding device and the laser welding device, and the solid-state welding device is used for pre-welding and fixing the inductance coil to the guide piece to form a welded inductance guide piece; the laser welding is used for conducting repair welding on the welding position of the inductance coil and the guide piece.

The invention relates to the technical field of section steel welding, in particular to a cold-formed section steel forming and welding method which comprises the following steps: S1, cleaning a welding position and nearby parts of cold-formed section steel, preheating the welding position by adopting a low-voltage high-current resistance heating mode after cleaning, and after the preheating treatment is finished, welding the cold-formed section steel by adopting a low-voltage high-current resistance heating mode; a soldering flux is smeared on the welding position, and a welding gun is used for conducting welding operation on the welding position; and S2, continuously collecting weld joint images through an industrial camera, fitting image data to obtain a surface contour image of a weld joint area, performing three-dimensional reconstruction on the surface contour image to obtain three-dimensional point cloud data of the weld joint area, evaluating the quality of the weld joint according to the three-dimensional point cloud data, and performing repair welding treatment on unqualified weld joints according to an evaluation result to obtain a repair welding result. According to the method, the problems that the welding effect is poor and the welding quality cannot be evaluated when the cold-formed section steel is welded in the prior art can be effectively solved.

The invention relates to the technical field of laser application, and particularly discloses an online pre-welding treatment and post-welding modification lath laser device which comprises a laser system, a power supply system, a cooling system, a shaping focusing system, a semi-reflecting mirror, a total reflecting mirror, a shielding gas system, a visual sensing system, a welding working platform system and a control system. Continuous laser is generated through the arranged optical fiber laser welding equipment for welding operation, a pulse laser beam generated by the pulse laser is divided into two beams through the semi-reflecting mirror, one beam can be used for removing an oxide layer on the surface of a welding sample on line before welding and exerting prestress on the surface at the same time, air holes are prevented from being generated during welding, cracks are reduced, and the welding quality is improved. And the other beam can be used for carrying out surface cleaning after welding and carrying out laser strengthening modification on a welding seam, so that the quality of the welding seam is improved, and the welding strength is improved.

The invention discloses a packaging structure of a half-bridge power module. The packaging structure comprises an insulating heat-conducting plate, a multi-layer circuit board, a plastic packaging body and a bridge arm switch, on the other hand, the invention discloses application of the packaging structure of the half-bridge power module in a vehicle-mounted OBC power converter, a DCDC isolation converter, a non-isolation power converter, a cardiac arrest wake-up device and a circuit module formed by combining multiple half bridges such as ANPC, TNPC and Heric. The invention further discloses a manufacturing method of the packaging structure of the half-bridge power module. The manufacturing method comprises the steps of assembling, arranging the overflow area and synchronously filling and grinding to remove the overflow area. The minimum size and low impedance are achieved through the DBC, flexible pin outgoing and welding are achieved through the PCB, the reliability, safety and heat dissipation of the module are supported through the plastic package body, and the expansion temperature monitoring unit and the decoupling capacitor are supported.

The invention relates to the technical field of welding of a titanium alloy or titanium heat exchange tube and a tube plate, and discloses a welding method and a welding protection device for the titanium alloy heat exchange tube and the tube plate. 2, positioning and mounting the positioning shaft head; step 3, mounting and adjusting a main air tap; step 4, mounting and adjusting the auxiliary air tap; 5, welding the tube plate and the heat exchange tube; a welding protection device for welding a titanium alloy heat exchange tube and a tube plate mainly comprises a positioning shaft head, a main air tap, a tungsten electrode and an auxiliary air tap. The device has the beneficial effects that all-directional argon isolation air protection near a welding seam, a heat affected zone and a welding zone in the welding process of the tube plate and the heat exchange tube is achieved, and the protection range of argon in the welding process is enlarged; and the uniformity, compactness and strength of the welding seam are improved, the forming quality of the welding seam is improved on the whole, and a silver welding joint is obtained.

The invention relates to the field of design, processing and manufacturing of compressor impellers, in particular to a novel discrete wheel cover closed impeller which comprises a lower wheel cover, a middle wheel cover and an upper wheel cover, the lower wheel cover is connected with the middle wheel cover through welding, and the middle wheel cover is connected with the upper wheel cover through welding, so that the blade top leakage rate of the discrete wheel cover closed impeller is smaller, and the performance of the discrete wheel cover closed impeller is superior to that of a semi-open impeller; the impeller has better manufacturability, is more beneficial to processing and manufacturing, has larger welding contact area and higher welding strength, meanwhile, the distance between the lower impeller cover and the middle impeller cover and the distance between the middle impeller cover and the upper impeller cover are smaller than 3mm, and the leakage rate is not greatly changed, so that the performance of the impeller is basically consistent with that of a closed impeller, and the axial force level is also basically consistent with that of the closed impeller; and the performance of the discrete wheel cover closed impeller is improved.

The invention relates to a high-temperature-resistant thermosensitive crystal resonator without a sealing cover, which comprises a lower base, a quartz chip and a thermistor, an upper base is arranged at the upper end of the lower base, the middle part of the upper end of the lower base and the middle part of the lower end of the upper base are respectively provided with a groove, and the two grooves are butted up and down to form an inner cavity; a quartz chip is installed in the lower groove, a thermistor is installed in the upper groove, and external electrodes connected with the quartz chip and the thermistor in a one-to-one correspondence mode are arranged at the lower end of the lower base. The upper base is used for replacing a metal upper cover for sealing, so that the thermal stress of the thermosensitive crystal resonator is effectively reduced, the problem that gold-tin alloy overflows due to packaging of a traditional metal upper cover is solved, meanwhile, the sealing performance of the resonator is improved, and accurate real-time temperature signals can be provided; the purpose of stable work in a high-temperature environment is achieved.

The invention relates to the technical field of cutting die laser cutting, in particular to laser cutting equipment for machining a cutting die and the cutting die, the laser cutting equipment for machining the cutting die comprises a shell, a cutting positioning mechanism is installed in the shell, the cutting positioning mechanism comprises an illuminating lamp, the illuminating lamp is fixedly installed in an inner cavity of the shell, and a mounting groove is formed in the shell. Two supporting plates are fixedly mounted in the mounting groove, the first electric track is fixedly mounted at the tops of the two supporting plates, a first sliding block is slidably mounted in the first electric track, and a second sliding block is slidably mounted on the surface of the second electric track. Through the arrangement of the cutting mechanism, the surface of a material can be ground in time in the laser cutting process, impurities, rust and uneven parts on the surface of the material can be removed through grinding, a laser beam can be more accurately focused on the surface of the material, the cutting edge is more tidy, and the machining requirement for higher precision is met.

The utility model discloses a single battery, a battery and a power utilization device, the single battery comprises a shell, an electrode assembly and an end cover, the shell is provided with a containing cavity and a mounting port communicated with the containing cavity, the electrode assembly is arranged in the containing cavity, the end cover is assembled at the mounting port along a first direction, the end cover is connected with the shell in a second direction, and the end cover is arranged in the containing cavity. A containing part is arranged in the connecting area of the end cover and the shell and suitable for containing welding flux, and an included angle is formed between the first direction and the second direction. According to the battery monomer disclosed by the embodiment of the invention, the accommodating part is arranged, and the accommodating part is suitable for accommodating the welding flux for welding, so that the expected weld penetration depth and weld width can be achieved, the welding strength is improved, high-power welding equipment does not need to be adopted or the power of the welding equipment does not need to be increased, and the welding cost can be reduced; the thermal stress and the welding stress in the welding process are improved, the deformation of the battery monomer is reduced, and the durability and the reliability of the battery monomer are improved.

The invention relates to the field of polyphenylene sulfide materials, and particularly discloses a laser-weldable PPS material and a preparation method thereof. The laser-weldable PPS material comprises the following raw materials in parts by mass: 50-90 parts of branched polyphenylene sulfide, 10-50 parts of wollastonite, 1-5 parts of boron nitride and 0.1-3 parts of a processing aid, the branching degree of the branched polyphenylene sulfide is not less than 10%; the length-diameter ratio of the wollastonite is not less than 10. The laser-weldable PPS material disclosed by the invention has the advantages of high laser transmittance and good welding strength.

The utility model relates to an adapter piece, a top cover assembly and a battery, the adapter piece is used for realizing the connection of an electrode terminal and an electrode assembly, the adapter piece comprises a first surface and a second surface which are oppositely arranged along the thickness direction of the adapter piece, the first surface is used for being connected with the electrode assembly, and the second surface is used for being connected with the electrode terminal; wherein the first surface is provided with a plurality of salient points. According to the utility model, the plurality of salient points are arranged on the first surface of the switching piece, so that the roughness of the first surface can be increased, when the switching piece is connected with the electrode of the electrode assembly through laser welding, the arrangement of the salient points can improve the laser absorption rate during laser welding, and the welding strength of the switching piece can be improved under the condition of lower energy consumption; and meanwhile, the welding surface forming can be improved. In addition, according to the battery provided by the utility model, as the welding strength of the adapter plate is improved, dislocation or physical strength between the adapter plate and the electrode assembly can be avoided, the battery is prevented from being broken, the service life of the battery is prolonged, and the reliability is high.

The embodiment of the invention relates to the field of photovoltaic technology, and provides a solar cell and a photovoltaic module, and the solar cell comprises a cell body, a first surface of the cell body is provided with a plurality of first grid lines which extend along a first direction and are arranged along a second direction, and the first surface comprises a first region and a second region which are arranged along the second direction, the first grid line at least located in the first region comprises a first main body part and a first connecting part which are alternately arranged; a plurality of columns of first bonding pad structures are arranged on the first surface, each column of first bonding pad structure comprises a plurality of first bonding pads, the first bonding pads are in electric contact with the corresponding first grid lines, the first bonding pads located in the first region are located on the first connecting parts, and the orthographic projection of the first connecting parts on the first surface is located in the orthographic projection of the first bonding pads on the first surface; the orthographic projection area of the first bonding pad in the first region on the first surface is larger than the orthographic projection area of the first bonding pad in the second region on the first surface. The solar cell and the photovoltaic module provided by the embodiment of the invention are at least beneficial to improving the welding tension between the solar cells.

The invention provides a high-strength aluminum alloy welding device and method. The device comprises an arc welding power source, an arc welding gun, an alternating magnetic field control power source, a magnet exciting coil, a magnetic core, a pulse laser, a laser head, a powder feeder, a powder feeding nozzle, surface-metallized ceramic particles, a welding robot and the like. According to the method, ceramic particle powder is uniformly distributed in a welding seam on the basis of pulse laser and alternating magnetic field cooperating with regulation and control of surface metallized ceramic particles, the welding strength of the high-strength aluminum alloy is improved, the interaction force generated by the alternating magnetic field and current on the ceramic particles is increased through the surface metallized ceramic particle method, and the welding quality of the high-strength aluminum alloy is improved. And meanwhile, a synergistic effect is formed between electromagnetic force in the alternating direction generated by the alternating magnetic field and impact force generated by the pulse laser on the molten pool, the motion state of the ceramic particle powder in the molten pool is controlled, uniform distribution of the ceramic particle powder in the welding seam is achieved, and finally the welding seam structure uniformity is achieved, and the welding seam strength is improved.

The invention is suitable for the technical field of solder strip preparation, and provides a high-corrosion-resistance low-temperature solder strip and a preparation method thereof.The preparation method comprises the following steps that a photovoltaic solder strip is sequentially subjected to the procedures of forming, annealing and hot tinning, a tin strip is obtained, the tin strip is cooled after being taken out of a tin furnace, when the temperature is reduced to 130-150 DEG C, the surface of the tin strip is evenly coated with coating liquid through a specific tool, and the high-corrosion-resistance low-temperature solder strip is obtained. And rapidly volatilizing the solvent by using the heat of the tin strip and external auxiliary heat to obtain the photovoltaic welding strip with a solid coating film layer. The coating liquid comprises the following raw materials in percentage by mass: 10-20% of rosin, 15-25% of bisphenol A epoxy resin, 0.2-5% of an active agent, 5-10% of a curing agent, 0.05-0.1% of an imidazole accelerant, 0.2-1% of a surfactant, 0.5-2% of other additives and the balance of a solvent. By generating a layer of cured resin film on the surface of the solder strip, the solder strip can be protected from corrosion for a long time, and the welding strength is greatly improved.

The invention relates to the technical field of welding, and particularly discloses self-fixing type automatic welding equipment for constructional engineering. The second support is arranged on the first support in a sliding mode, and the first support and the second support are each provided with a fixing frame; the first sliding rod is arranged on the second support in a sliding mode, the first sliding rod is provided with a second sliding rod in a sliding mode, and a tension spring is installed between the second sliding rod and the first sliding rod; the welding units are mounted on the adjacent fixing frames; the first sliding frame is arranged on the second bracket in a sliding manner; the second sliding frame is arranged on the first support in a sliding mode, and the first sliding frame and the second sliding frame are each provided with two swing plates in a rotating mode. Two machined parts are fixed in an auxiliary mode through the first support, the second support and the swing plate, it is guaranteed that the two machined parts are kept stable in the welding process, and the connecting strength of the connecting position after welding is improved.

The invention discloses an ultrahigh-strength metal powder core type flux-cored wire and a preparation method thereof, the ultrahigh-strength metal powder core type flux-cored wire comprises a steel strip and a flux core, the steel strip is filled with the flux core, and the flux core comprises 0.03%-0.10% of carbon, 0.3%-1.0% of silicon, 1.0%-3.0% of manganese, 2.6%-3.0% of nickel, 0.5%-1.0% of molybdenum, 0.3%-1.0% of chromium, 0.1%-0.4% of copper, 0.001%-0.020% of boron, 0.03%-0.07% of titanium, 0.05%-1.0% of magnesium, 0.3%-0.6% of aluminum, 1.2%-3.0% of calcium silicate, 0.3%-0.8% of strontium carbonate, 0.3%-0.8% of lanthanum carbonate, and the balance iron. 0.5 to 1.5 percent of sodium fluoride, 0.08 to 1.0 percent of modified titanium dioxide and the balance of Fe and other impurities. The invention belongs to the technical field of welding materials, and the welding wire has the characteristics that all components of the welding wire are fully matched, the melt fluidity is good in the welding process, filling is good, air holes are few, the high welding flux reaction rate is high, and the wire feeding rate is high.

The invention relates to a welding method of a large-size tungsten-silicon alloy target material, which comprises the following steps: a back plate and a tungsten-silicon target material are respectively machined, the welding surface of the back plate is sequentially and concentrically provided with an assembly groove and a welding flux groove from top to bottom, the diameter of the welding flux groove is smaller than that of the target material, and a pretreated back plate and a pretreated target material are obtained; filling solder in a solder groove of the pretreated back plate, coating the solder on the welding surface of the pretreated target material, then heating the back plate and the target material to melt the solder, and then respectively performing infiltration treatment on the welding surfaces of the back plate and the target material to obtain the infiltrated back plate and target material; and the infiltrated back plate and the target material are assembled to obtain a target material assembly, the target material assembly is pressurized and then cooled, and the welded target material assembly is obtained. According to the welding method provided by the invention, the welding bonding strength of the target material and the back plate can be effectively improved, the target material assembly is prevented from being unsoldered and cracked, and deformation caused by welding is reduced.