26 results about "Laser brazing" patented technology

The present application belongs to the field of dissimilar metal laser welding, and particularly relates to a method for improving the gap adaptability of dissimilar metal butt joint laser brazing by alternating magnetic field. By setting the butt joint part of the dissimilar metal test plate with assembly gap suspended at the bottom, applying transverse alternating magnetic field and inert gas protection below it, and setting the laser welding head above the sample and the magnetic field generating device below the sample to remain stationary during the welding process, and the laser beam is offset to the low melting point metal side, the molten low melting point material wets and spreads on the surface of the un-molten high melting point material, and then interface metallurgical bonding occurs to form a brazing joint. The present application improves the assembly gap adaptability of dissimilar metal butt joint laser brazing based on the effect of transverse alternating magnetic field lifting the molten pool, suppresses the generation of aluminum alloy weld side heat cracks and other defects caused by the increase of assembly gap, improves the weld forming, and improves the adaptability of dissimilar metal butt joint laser brazing in engineering.

The application belongs to the technical field of material welding, and particularly relates to a negative pressure laser brazing method for single-sided sealing of a ceramic tube / metal plate. Through the synergistic regulation and design among the surface micro-texture, negative pressure environment and laser heat field regulation during laser brazing, high-reliability connection is realized, the temperature gradient of the connection interface is effectively reduced, and through accurate regulation of parameters, the interface wettability, thermal stress and uniformity of the structure are synergistically improved. In addition, the ceramic tube / metal plate composite obtained by the laser brazing method is suitable for high-temperature and high-pressure environments, and can be applied to the manufacturing of sealing structures of nuclear power equipment, chemical reactors and solid oxide fuel cells.

A laser processing head (50) for directing laser light onto a workpiece (WP), wherein the laser processing head (50) comprises the following: - a collimator (64) arranged in an optical axis of the laser light and configured to convert the laser light into collimated light; - a beam splitter (70) arranged in the optical axis between the collimator and a main output at an angle to the collimated light and having at least two sections arranged on a surface of the beam splitter (70), wherein the at least two sections comprise a peripheral antireflective section (72) configured to allow peripheral light of the collimated light at least partially to pass to the main output (55a), and an inner highly reflective section (74), wherein the peripheral region surrounds the inner region, and wherein the inner highly reflective section (74) has an oval shape such that the angled oval inner highly reflective section (74) reflects a secondary laser beam (SB) having a cylindrical shape towards a focusing lens 76 for a secondary fiber (40); - the main output (55a) which is arranged in optical connection with the beam splitter (70), wherein the main output (55a) is configured to direct at least the first light into a main laser beam onto the workpiece (WP); and - a secondary output (55b) arranged in optical connection with the beam splitter (70), wherein the secondary output (55b) is configured to direct at least the second section into a secondary laser beam alongside the main laser beam and comprises the following: - at least one focusing lens (68) arranged in optical connection with the beam splitter (70) and configured to focus any collimated light transmitted from the beam splitter (70) and falling onto the focusing lens (68); and - at least the secondary fiber (40) which has an input arranged in optical connection with the focusing lens (76) and which has an output arranged in optical connection with the workpiece (WP).

The present application belongs to the technical field of laser brazing, and proposes a welding structure for laser brazing of optical assemblies and a method for using the same, which is used for welding and fixing of optical assemblies. The welding structure comprises optical elements, welding pins, optical element mounting plates, optical assembly welding bottom plates and solder structures. The optical assembly comprises the optical elements and the optical element mounting plates. In use, the solder structure is placed in the recessed structure of the optical element mounting plate, the welding pin is screwed into the threaded hole of the optical element mounting plate until the lower hemisphere structure of the welding pin coincides with the inner spherical surface structure of the solder structure, the welding laser is aligned with the laser irradiation surface of the solder structure, and the optical elements are welded and fixed in sequence. The present application has the advantages of simple structure and strong adaptability. The use of the welding pin can effectively reduce the distance by which the optical assembly deviates from the predetermined position due to the welding stress during the welding process. In addition, the optical assembly can be disassembled without damage by heating the solder structure and unscrewing the welding pin.

The utility model provides a vehicle body seam guiding and positioning mechanism for laser brazing, which relates to the technical field of welding and positioning devices and comprises a base, handrails arranged on two sides of the top of the base, a sliding rail arranged on the top of the base, a sliding seat arranged on the top of the sliding rail, a placing plate arranged on the top of the sliding seat and positioning clamps arranged on two sides of the placing plate. Rubber columns are arranged on the two sides of the base, supporting columns are arranged at the tops of the rubber columns, a motor is arranged at the top of each supporting column, and a laser brazing device is arranged in the center of the bottom of each motor. In this way, the laser brazing device with the top capable of sliding left and right through the sliding groove is matched for multi-directional welding, the welding efficiency is improved, and manpower is reduced.

The application discloses a preparation method of a high-entropy alloy laser brazing single-layer diamond grinding wheel, and comprises the following steps: a grinding wheel steel base material is mechanically processed to obtain a grinding wheel steel base; Cr, Cu, Ni-Cr-B-Si and Ti powders are ball milled to prepare high-entropy alloy powder as a brazing filler metal; a tool forming blank is prepared in the order of the grinding wheel steel base as the bottom layer, the brazing filler metal as the middle layer and diamond abrasive particles as the upper layer; the brazing filler metal is heated to melt by laser in an inert gas environment; after cooling, the diamond abrasive particles are brazed and fixed on the surface of the grinding wheel steel base to obtain the single-layer diamond grinding wheel. After laser brazing, interface reaction between the surface of the diamond abrasive particles and the molten high-entropy alloy occurs, a metal carbide layer which is firmly combined with the surface of the diamond is formed, firm chemical and metallurgical bonding between the diamond and the brazing filler metal is generated, and thus the single-layer diamond grinding wheel is prepared, and the single-layer diamond grinding wheel has the advantages of good wettability of the brazing filler metal to the diamond, high production efficiency and small thermal damage of the diamond.

Device for laser welding and / or laser soldering (100a), comprising a device for guiding a light beam (200a) with a focusing optic (210a, 210b) and a deflecting optic arranged downstream along a propagation direction of the light beam and rotatable about a rotational axis, wherein the deflecting optics are designed to guide the light beam, when driven in a rotating manner, along a circular path perpendicular to the direction of propagation, such that a radius of the weld path (150a, 150b) is smaller than a radius of a circle which the light beam describes when exiting the deflecting optics, and wherein the focusing optics (210a, 210b) are configured to focus the light beam so that it has a focus diameter between 50 µm and 500 µm on the circular path, the deflection optics consist only of a wedge plate (250a, 250b) and no other optical components, wherein the wedge plate (250a, 250b) is formed by two optical elements (260a, 260b, 270a, 270b) and has two planar surfaces as end faces (262a, 272a), wherein the optical elements of the wedge plate have complementary spherical surfaces (264a, 274a) facing each other, one of which spherical surfaces (264a) forms a concave surface of the first optical element (260a, 260b) and the second spherical surface (274a) forms a convex surface of the second optical element (270a, 270b), and the concave surface and the convex surface have the same radius of curvature and are to be shifted relative to each other along the mutually facing spherical surfaces (264a, 274a) such that the planar surfaces (262a, 272a), as surfaces facing away from the respective spherical surface (264a, 274a) of a respective optical element, run at an angle to each other, wherein the optical element (270a, 270b) of the wedge plate (250a, 250b), which is not the first to be hit by the light beam, is adjustable by means of a shaft with worm gear, wherein the upper surface (262a) of the wedge plate (250a, 250b) is installed at an angle to the light beam.

The invention belongs to the technical field of metal processing machine tools, particularly relates to a fluctuation type rotating magnetic field device for assisting laser brazing, and solves the technical problems that an existing device is large in size, heavy in weight, high in requirements for operation space and load bearing, high in cost and inflexible in magnetic field direction adjustment. The device comprises an XY direction moving platform, a rotary driving motor, a neodymium iron boron permanent magnet and a permanent magnet supporting assembly, the rotary driving motor and the Y-direction moving platform are installed on the X-direction moving platform, a first bevel gear is installed at the shaft end of the rotary driving motor, a horizontal transmission shaft is installed on a sliding piece of the X-direction moving platform, a second bevel gear is installed on the horizontal transmission shaft, the first bevel gear and the second bevel gear are meshed, and a universal coupling is hinged to the other end of the horizontal transmission shaft. The permanent magnet supporting assembly comprises a permanent magnet supporting platform, a driving rotating shaft, a rotating shaft supporting platform and three sets of electromagnetic telescopic cylinders, the neodymium iron boron permanent magnet is fixed to the permanent magnet supporting platform, and the lower end of the driving rotating shaft is hinged to the universal coupling.

The application discloses a Ti-based medicine core wire material suitable for laser brazing of titanium alloy sheet, which comprises a medicine core and an outer skin, wherein the medicine core elements are prepared according to atomic percentage, and the atomic percentage of the medicine core elements comprises Zr: 20%-45%, Cu: 20%, Ni: 20%, and Cr: 15%-40%, and the total atomic percentage is 100%; the outer skin is a TA1 belt, and the composition of the TA1 belt is H: 0.015%, O: 0.18%, N: 0.05%, C: 0.26%, Fe: 0.2%, and Ti is the balance. The Ti-based medicine core wire material brazing filler metal is suitable for laser brazing connection of the titanium alloy sheet, a solution method for solving the cracking and even scrapping of the connection part of the titanium alloy sheet component in the aerospace field under complex working conditions for a long time is provided, and a preparation method of the Ti-based medicine core wire material brazing filler metal foil is also provided.

The application discloses a kind of laser brazing equipment and method thereof, it is related to laser welding technical field, its technical solutions are: including workbench, workbench is equipped with XYZ axis transfer platform, XYZ axis transfer platform side is fixedly provided with welding machine box, welding head is fixedly arranged at the bottom of welding machine box, the side of welding machine box is equipped with wire pulling mechanism, and the top of workbench is equipped with fixed mechanism;Wire pulling mechanism includes wire reel, and wire reel is arranged in the inside of welding machine box, and welding wire is arranged on the side of wire reel, and sleeve pipe is fixedly arranged at the bottom of welding machine box, and wire pulling shell is fixedly arranged on the side of sleeve pipe, and welding wire penetrates sleeve pipe and wire pulling shell, and wire pulling assembly is arranged in the inside of wire pulling shell, and wire pulling assembly includes two transmission shafts, and the side wall of wire pulling shell is connected by bearing, improves the precision of wire feeding, facilitates welding head to carry out welding, improves traction degree, makes the speed of welding wire leading and welding speed level, makes welding positioning precision improve, improves welding efficiency.

The present application relates to a kind of multifunctional self-adaptive press bonding device for electric field coupling laser brazing, it includes workbench, at least two elastic link mechanisms being set on the workbench, slippable installation in the swing end of the elastic link mechanism and be locked on the elastic link mechanism by fastener on the conductive rod, and soft copper pressure ring being installed on the conductive rod by rotating pair;Wherein, the workbench is provided with the insulating clamping site for installing workpiece, the at least two elastic link mechanisms are arranged at intervals around insulating clamping site, the soft copper pressure ring is provided with several flat parts being arranged relative to workpiece end face, and multiple round parts being arranged relative to workpiece flange and / or recess.The present application is suitable for the scene of small batch laser processing of various kinds in laboratory, with the advantages of meeting the comprehensive needs of electric field coupling laser brazing to conductive stability, topography adaptability, stress buffer for brittle material and operation convenience.

The invention discloses a laser-brazing-pressure multi-composite preparation method of a dissimilar metal composite plate. The method comprises the following steps: firstly, cleaning a to-be-composited surface of the dissimilar metal plate; then a preset brazing filler metal layer is formed on the surface of one plate through cold spraying; then, the back faces of the to-be-compounded faces of the two metal plates are precisely preheated to the preset temperature through laser beams; the two preheated metal plates are conveyed to a first set of rolling wheels to be rolled for the first time, melting and wetting of brazing filler metal are achieved, and brazing connection is formed; then the composite board is placed in a heat preservation chamber to be subjected to heat preservation treatment, and the interface metallurgical reaction is further promoted; and finally, the composite board subjected to heat preservation is rolled for the second time, and pressure welding connection is completed. Through the synergistic effect of laser-assisted brazing and laser preheating pressure welding, metallurgical bonding and plastic bonding between dissimilar metal plates are compounded, the interface bonding strength is remarkably improved, meanwhile, the needed rolling pressure is reduced, and the method is particularly suitable for efficient and high-quality compounding of copper / aluminum, steel / aluminum and other thin plates.

This invention relates to a laser brazing method for a Coriolis mass flow meter. The laser brazing method includes the following steps: mixing nickel-based brazing filler powder and a binder to obtain a paste-like brazing filler; applying the paste-like brazing filler to the gaps between the measuring tube and the distributor, and between the measuring tube and the flange, respectively, to obtain an assembly; assembling the assembly into a special tooling and performing laser brazing to obtain a welded assembly; and performing vacuum heat treatment on the welded assembly to obtain the Coriolis mass flow meter. This invention first applies a paste-like brazing filler to the gaps between the measuring tube and the distributor, and between the measuring tube and the flange, respectively, to obtain an assembly. Then, the assembly is sequentially subjected to laser brazing and vacuum heat treatment. This invention can achieve a low-stress, high-strength, and high-airtightness connection between the measuring tube and the distributor, and between the measuring tube and the flange, ultimately improving the measurement accuracy of the Coriolis mass flow meter.

The invention discloses a laser brazing process method with a lap joint angle and a galvanized sheet laser brazing process method, and relates to the field of laser brazing, and the laser brazing process method comprises the steps that an upper to-be-welded component is in lap joint with a lower to-be-welded component and is fixed, an inner lap joint area and an outer lap joint area are formed between the lower to-be-welded component and the upper to-be-welded component, and the angle of the inner lap joint area is 15-45 degrees; setting parameters of a laser brazing process; and according to the parameters of the laser brazing process, laser brazing is conducted on the welding seam of the outer lap joint area in the length direction of the welding seam of the outer lap joint area, so that welding with the lap joint angle of the upper to-be-welded component and the lower to-be-welded component is achieved. The angle lap joint mode is adopted, hemming is not needed, materials needed for hemming are saved, and the welding speed, the welding quality and the welding efficiency are improved.

This invention belongs to the field of dissimilar metal welding and relates to a laser welding process for aluminum-copper dissimilar metals. The welding process includes: preparing a first microstructure on the upper surface of a copper plate in the area to be welded; preparing a second microstructure on the lower surface of the copper plate in the overlapping area; then stacking the copper plate onto an aluminum plate, with the second microstructure of the copper plate overlapping the aluminum plate; and performing laser brazing under a protective atmosphere, with the laser beam focused on the first microstructure of the copper plate and welded along a predetermined path. This process, through the pretreatment of differentiated microstructures on the upper and lower surfaces of the copper plate, simultaneously achieves high laser absorption, low heat input, controllable interface, and mechanical anchoring, overcoming the core challenges of high reflectivity, thick brittle phases, and low joint strength in copper-aluminum laser welding, resulting in a high-strength, highly stable, and low-defect copper-aluminum dissimilar metal joint.

The application discloses a laser brazing method and system for vertical welding position, comprising determining the vertical welding angle of the welding seam of the workpiece to be welded; according to the preset angle interval to which the vertical welding angle belongs, selecting the corresponding laser brazing process parameter combination, wherein the process parameters at least include laser power, wire feeding speed and laser spot parameters, and the process parameter combinations corresponding to different angle intervals are different; and using the selected process parameter combination to perform laser brazing on the workpiece to be welded. Through the establishment of the dynamic matching relationship between the vertical welding angle and the laser brazing process parameters, high-quality and automatic vertical welding at any angle is realized, and the technical difficulties of poor brazing material flow and poor parameter adaptability are effectively solved.

The present application relates to a kind of laser brazing system and laser brazing method, the first workpiece and second workpiece of lap joint form inner corner welding area and weld path, laser outputs laser beam to be irradiated to inner corner welding area, wire feeder outputs brazing filler wire, laser beam is irradiated to the brazing filler wire that is not continuously output in inner corner welding area, and brazing filler wire is fused covering and fills inner corner welding area, weld joint and wire feeder move along weld path to complete welding, the present application uses brazing filler wire in the inner corner area of workpiece splicing to carry out laser brazing, only brazing filler is melted in brazing process, and matched workpiece is only heated, brazing filler is melted and flows into the gap between workpiece and is combined with workpiece surface, reduce the thermal stress of workpiece, improve the problem of workpiece deformation in welding;Meanwhile, using the way of inner corner welding, brazing filler wire is filled into the right angle inner side area formed after workpiece splicing, avoid workpiece to be welded through.

The invention provides a saw blade bit laser brazing mechanism, which is suitable for laser brazing a bit on a tooth of a saw blade, comprising a bearing device for bearing the saw blade, a laser generator for generating laser, a reflector for reflecting the laser generated by the laser generator, and a pressing device for pressing the bit from the side opposite to the tooth where the bit is located, so that the brazing agent between the bit and the tooth is kept in a tight pressing state. The reflector is located beside the saw blade borne by the bearing device, and the laser generator is arranged opposite to the reflector. The laser generated by the laser generator is irradiated on the bit pressed by the pressing device in a radiative heating manner under the reflection of the reflector, so that the bit conducts heat to the brazing agent while being heated, thereby melting the brazing agent to fix the bit and the tooth together. The problem of pulling force is solved, the deformation and even cracking are effectively prevented, and the mechanism has the advantage of simple structure.

The application belongs to the technical field of metal processing machine tools, and particularly relates to a fluctuation type rotating magnetic field device for assisting laser brazing, which solves the technical problems of large size, heavy weight, high requirements for operation space and load bearing, high cost and inflexible magnetic field direction adjustment of existing devices, and comprises an X\Y direction moving platform, a rotating drive motor, a neodymium-iron-boron permanent magnet and a permanent magnet support assembly; the rotating drive motor and the Y direction moving platform are installed on the X direction moving platform, the shaft end of the rotating drive motor is provided with a first bevel gear, the sliding part of the X direction moving platform is provided with a horizontal transmission shaft, the horizontal transmission shaft is provided with a second bevel gear, the first and second bevel gears are engaged, the other end of the horizontal transmission shaft is hingedly connected with a universal joint, the permanent magnet support assembly comprises a permanent magnet support platform, a drive rotating shaft, a rotating shaft support platform and three groups of electromagnetic telescopic cylinders, the neodymium-iron-boron permanent magnet is fixed to the permanent magnet support platform, and the lower end of the drive rotating shaft is hingedly connected with the universal joint.

The invention relates to a multifunctional self-adaptive crimping device for electric field coupling laser brazing. The device comprises a workbench, at least two elastic connecting rod mechanisms arranged on the workbench, conducting rods which are slidably installed at the swing ends of the elastic connecting rod mechanisms and locked on the elastic connecting rod mechanisms through fasteners, and soft copper pressing rings installed on the conducting rods through revolute pairs. Wherein the workbench is provided with an insulation clamping position used for installing a workpiece, the at least two elastic connecting rod mechanisms are arranged around the insulation clamping position at intervals, and the soft copper pressing ring is provided with a plurality of flat pressing parts arranged opposite to the end face of the workpiece and a plurality of round pressing parts arranged opposite to a flange and / or a groove of the workpiece. The method is suitable for a multi-variety and small-batch laser processing scene in a laboratory, and has the advantage of meeting the comprehensive requirements of electric field coupling laser brazing on conductive stability, morphology adaptability, brittle material stress buffering and operation convenience.

The invention discloses a laser brazing repair device for electric vehicle battery pack shell damage, and relates to the technical field of battery shell laser repair, the laser brazing repair device comprises a welding assembly, a laser brazing assembly and a laser brazing assembly, the welding assembly comprises a welding machine and a welding gun, and the welding gun is connected with the welding machine through a wire; the positioning assembly is connected with the welding gun and comprises a positioning piece, the positioning piece comprises a positioning block, a clamping groove is formed in the positioning block, a rolling wheel is arranged in the clamping groove, a supporting plate is rotationally connected to the outer side of the rolling wheel, and a rotating column is rotationally connected to one side of the supporting plate. The laser welding device has the beneficial effects that by arranging the positioning assembly, the moving track of the laser gun head can be restrained, so that the laser gun head can only move along the track of a welding seam, the laser focus is always aligned with the center of the welding seam, the deviation is small, and the defects of insufficient welding, welding skips, base material burnthrough, shell deformation and the like are fundamentally avoided; it is ensured that the repaired battery pack shell meets the strength requirement, and potential safety hazards of water inflow and short circuit of the battery pack are eliminated.

The utility model relates to the technical field of diamond millstone brazing, in particular to an ultrasonic-assisted laser brazing device for structurally-arranged diamond millstones, which comprises a workbench, a laser brazing mechanism, an ultrasonic-assisted laser brazing device and a laser brazing device, the top of the workbench is fixedly connected with a placing seat, and the top of the workbench is provided with the laser brazing mechanism; the adjusting mechanism comprises a driving disc frame rotationally connected to the inner wall of the placing seat; according to the device, through a first servo motor, a driving disc frame and a fixing block, synchronous adjustment of the positions of three sets of abutting blocks is achieved, through a spring and the abutting blocks, abutting of grinding disc workpieces of different specifications is achieved, and then the grinding disc workpieces of different specifications are located on a containing base; compared with an existing mode that a positioning tool for the grinding disc workpiece needs to be replaced when the grinding disc workpieces of different specifications are positioned, the mode does not need to replace the positioning tool for the grinding disc workpiece, and the cost of the positioning tool for the invested grinding disc workpiece is reduced.

The utility model provides a multi-angle clamping tool for laser brazing of an automobile tail door. The multi-angle clamping tool comprises two fixed side plates and rotating assemblies, and the two fixed side plates are connected with the rotating assemblies. The two ends of the fixed strip frame are connected with the rotating assemblies through moving assemblies correspondingly, and the moving assemblies can adjust the position of the fixed strip frame; and the clamping assembly is used for clamping and fixing the automobile tail door. The clamping assemblies can be rotated through the rotating assemblies, the longitudinal positions of the clamping assemblies can be moved through the moving assemblies, the transverse positions of the single clamping assemblies can be freely moved through the fixing strip frames, and the positions of the clamping assemblies can be flexibly moved; therefore, the clamping assembly can be used for clamping and fixing the automobile tail doors of different models, the application range of the clamping tool is expanded, and the flexibility and practicability of the clamping tool are improved.

The invention provides a clamp and a welding system for automobile rear cover laser brazing, and relates to the technical field of automobile body-in-white manufacturing, the system is arranged inside and outside a laser protection room, and comprises a dust removal mechanism, a water cooling machine, a control cabinet and a monitoring and display system which are located outside, the laser generator, the robot body, the rear cover positioning mechanism, the test welding table and the power meter are located inside. The rear cover positioning mechanism is provided with a special clamp and comprises a base, a driving device, a plurality of pressing and supporting units, a jacking device, guiding equipment and the like, accurate positioning and stable clamping of workpieces can be achieved, and part of the pressing units achieve stepless adjustment through electric cylinders. The system is further provided with a tail lamp box pressing unit and a connecting rod device, and the stability of the workpiece in the welding process is further guaranteed. The device is simplified in structure, short in operation takt, high in welding quality and capable of effectively avoiding the air hole defect caused by zinc steam in galvanized sheet welding and reducing the repair rate and the production cost.

The invention belongs to the technical field of material welding, and particularly relates to a negative pressure laser brazing method for single-side sealing of a ceramic tube / metal plate. According to the laser brazing method, high-reliability connection is achieved, the temperature gradient of a connection interface is effectively reduced, and cooperative improvement of interface wettability, thermal stress and structure uniformity is achieved through accurate regulation and control of parameters by introducing a cooperative regulation and control design among surface microtexture, a negative pressure environment and laser thermal field regulation and control in the laser brazing process. In addition, the ceramic tube / metal plate composite part obtained through the laser brazing method is suitable for high-temperature and high-pressure environments and can be applied to manufacturing of sealing structures of nuclear energy equipment, chemical reactors and solid oxide fuel cells.

In a method of manufacturing a lap joint or a lap joint by brazing a steel sheet and an aluminum-based sheet, when brazing is performed by irradiating a preceding laser beam in front of a joining direction of a joining position (joining point) of the steel sheet and the aluminum-based sheet to preheat a joining predetermined position, supplying an aluminum-based filler wire after electric current heating to the joining position (joining point), and irradiating a following laser beam in back of the filler wire to melt the filler wire, the filler wire is fed in a manner inclined to the front or back of the joining direction within a range of 0° ≤ D ≤ 19° with respect to a line passing through the center of a bevel of the lap joint as a center line and perpendicular to the joining direction, or with respect to a line perpendicular to a lower sheet surface of the lap joint, thereby manufacturing the lap joint or the lap joint by the steel sheet and the aluminum-based sheet without bead appearance defects and having sufficient joint strength.