4083 results about "Laser soldering" patented technology

The invention provides a high-precision intelligent welding system adapting to complex working conditions, and relates to the technical field of laser welding. The high-precision intelligent welding system adapting to the complex working conditions comprises the steps of S1, based on a high-resolution visual sensor and a laser scanner, S2, based on preprocessed point cloud data, S3, based on a workpiece three-dimensional model, S4, based on an optimized welding path and a material attribute database, S5, based on a dynamic welding parameter set, S6, based on a real-time welding track, and S7, based on multi-sensor monitoring data. S8, based on a defect detection report; and S9, based on a repaired welding result and historical welding data. According to the invention, the geometric data of the workpiece are collected through the high-resolution visual sensor and the laser scanner, the filtering algorithm is applied to remove noise to generate high-quality point cloud data, and a subsequent processing foundation is laid; workpiece features are identified by using a point cloud processing algorithm and a machine learning method based on the point cloud data, and an accurate digital model is generated through a three-dimensional reconstruction algorithm.

The invention relates to a tin ring automatic focusing laser soldering tin fixing and 3D welding spot detecting system, and belongs to the technical field of industrial automatic laser processing. The system is characterized in that a tin ring preparation module identifies pins in real time and dynamically optimizes winding parameters through visual positioning and a self-adaptive winding head, and performs defect identification and pre-repair analysis through multispectral imaging; the soldering tin positioning module is used for switching stations through a rotary table, and precise positioning and clamping of a product are realized by combining laser contour sensing and a focusing compensation algorithm; the laser tin soldering module can visually identify tin materials and automatically call welding parameters, laser power and action time are regulated and controlled in real time by establishing a regional heat conduction model, and gradient cooling is implemented after welding; and the 3D detection module adopts dual-mode scanning, constructs a welding spot three-dimensional model based on fusion data, recognizes microcracks through super-resolution processing, and discriminates the welding spot quality. And automation and intellectualization of the whole process from tin ring preparation to welding spot quality detection are achieved.

The invention discloses an automobile tubular part inner wall supporting type laser welding device and technology, and relates to the technical field of automobile tubular part machining, the automobile tubular part inner wall supporting type laser welding device comprises a pipe welding base, an inner wall self-adaption supporting unit and a vertical displacement adjusting assembly, radial guide bases are connected to the two sides of the pipe welding base, and a synchronous servo motor is installed on the outer side of the pipe welding base; an internal driving screw rod and a guide sliding rod drive a stroke frame and a bearing supporting plate to achieve radial positioning of the supporting unit, the inner wall self-adaptive supporting unit comprises a driving cabin and a synchronous power source, transmission is achieved through a lead screw, a transmission fluted disc and a vortex transmission cylinder, a sliding adjusting sleeve is pushed, a supporting rod drives an arc face attaching lining plate to open and attach to the inner wall of the tubular part, and the tubular part is fixed. A vertical displacement adjusting assembly is arranged in a frame supporting beam, a variable frequency motor and a fine adjustment motor drive a guide screw rod and a screw rod correspondingly, alignment of a laser welding head is adjusted, a welding slag collecting groove in the center of a base and a detachable storage box are convenient to remove slag, and the welding machine is suitable for welding of tubular parts of multiple specifications.

The invention relates to the technical field of laser welding, in particular to a laser welding tool for multi-size battery machining, which comprises a machining box body and a moving assembly for driving a laser welding head, a base frame is fixedly mounted at the top of the machining box body, and a pushing feeding assembly is arranged in the base frame. And the driving assembly is used for driving the battery bodies to achieve interval type horizontal transferring, a concentric-square-shaped moving plate in the pushing feeding assembly is responsible for gradually feeding the battery bodies step by step, moving blocks are fixedly installed at the two ends of the concentric-square-shaped moving plate, and upper and lower belt material assemblies are arranged in the moving blocks. According to the full-automatic battery top end cover welding machine, time sequence coupling of the four functions of clamping, conveying, taking and placing and cleaning is achieved, multi-process cooperation is completed, the electrical control complexity and cost are greatly reduced, absolute synchronization of takt time among the processes is fundamentally ensured, extremely high repeated positioning precision and anti-interference capacity are achieved, and the welding quality of a battery top end cover is improved.

The invention belongs to the technical field of laser welding, and discloses a multi-parameter cooperative control laser welding method and system.The method comprises the steps that a laser energy control model is established based on material strength-thickness-gap ternary coupling, and the output power of an optical fiber laser is controlled; coaxial three-layer gradient gas is adopted for protection of a welding area, preheating before welding and double-temperature-zone gradient annealing after welding are adopted, the output power of an optical fiber laser and the three-layer gradient gas protection flow are regulated and controlled in real time through combination of multiple sensors and a control algorithm, the temperature of a heat affected zone is monitored in real time, and a cooling nozzle is controlled for cooling. And continuous parameter optimization is achieved through machine learning, and multi-parameter control laser welding is achieved.

The invention discloses an intelligent tailored blank laser welding device for multi-angle adjustment of metal parts, and belongs to the technical field of laser welding devices. An intelligent tailored blank laser welding device for multi-angle adjustment of metal parts comprises a device body and a welding table fixedly installed on the surface of the top end of the device body, placing frames are correspondingly and fixedly installed on the surface of the welding table, and metal plates to be welded are placed in the two placing frames; a first fixing frame and a second fixing frame are arranged at the corresponding ends of the two containing frames correspondingly, and sliding grooves are formed in the inner side faces of the first fixing frame and the second fixing frame correspondingly. According to the intelligent tailored blank laser welding device for multi-angle adjustment of the metal parts, under the condition that a gear moves along with a sliding block, the gear enables a welding head to swing in a small-amplitude reciprocating mode to conduct scale welding on two metal plates under the action of a first toothed plate and a second toothed plate, the metal plate welding speed of welding equipment is increased, and the welding efficiency is improved. And the welding quality of the welding device on the metal plate is also ensured.

The invention discloses an automobile light-weight aluminum part connecting process and equipment based on laser welding, and relates to the technical field of automobile aluminum part laser welding, the equipment is based on a base body, a man-machine interaction control screen is arranged at the front end of the base body, and a driving motor and a threaded rod are arranged on the side wall of the base body; a lateral protection metal plate is fixed to the top end of the tool, a parameter adjusting plate is arranged on one side of the tool, a rotary station driving motor and a self-adaptive clamping tool are fixed to the parameter adjusting plate, an anti-scratching gasket is arranged on the inner wall of the tool in the circumferential direction, and the outer side of the tool is connected with a feeding air cylinder through a linkage lug base. The air cylinder is connected with a pressure controllable extrusion table through a first linkage lug base and a force transmission bending arm. A main bearing support is further welded to a base body, a laser welding head is installed on the main bearing support through a jacking air cylinder, a linear push rod and a fine adjustment lifting table, adjustment stability is guaranteed in cooperation with a guide structure, aluminum parts are prevented from being damaged through flexible clamping, precision is improved through multi-dimensional adjustment, and the precision welding requirement is met.

The invention relates to the technical field of spiral finned tube laser welding, in particular to a solid spinning spiral finned tube laser welding machine. Comprising a first base and a second base, a threaded rod is rotationally connected between the first base and the second base, and the threaded rod is in threaded connection with a machining assembly; the first motor drives the driving belt wheel to rotate, so that the machining assembly conducts welding operation of the spiral fins on the surface of the base tube while moving, and through the transmission relation between the driving belt wheel and the driven belt wheel, the base tube synchronously rotates while the machining assembly conducts moving machining; according to the spiral finned tube machining device, the machining assembly is arranged to meet the welding requirement of the spiral finned tube, movement of the machining assembly and rotation of the base tube are controlled at the same time through the same driving structure, the stability and consistency in the machining process are improved, the machining speed can be adjusted more conveniently, fin welding is more uniform, and the welding quality is effectively improved.

The invention discloses a wire feeder and handheld welding equipment. The wire feeding machine comprises a wire guide mechanism, and the wire guide mechanism comprises a first wire guide wheel; a wire feeding channel for guiding a welding wire is formed between the second wire guide wheel and the first wire guide wheel; the adjusting assembly comprises a first force arm, one end of the first force arm is hinged to the first fulcrum, the other end of the first force arm is flexibly supported on the second fulcrum, and the second godet wheel is rotationally connected to the first force arm; and the distance between the second wire guide wheel and the first wire guide wheel can be dynamically adjusted along with the change of the diameter of the welding wire passing through the wire feeding channel under the assistance of the first force arm. By means of the mode, the wire feeder can adjust the width of the wire feeding channel in a self-adaptive mode, effectively adapts to changes of the diameter of a welding wire in the wire feeding process, guarantees stable conveying of the welding wire, and avoids the phenomenon of wire clamping or unsmooth wire feeding.

The invention belongs to the technical field of thin plate laser welding, and particularly relates to a curved-surface thin plate laser welding device which comprises a welding base. A first supporting frame is arranged on the welding base. The upper fixing base and the lower fixing base are matched with a plurality of short rods to adaptively clamp different types of curved-surface thin plates, and are matched with two laser welding heads to perform double-sided welding, so that the effect of performing counterpoint double-sided laser welding on the different types of curved-surface thin plates is achieved, traditional laser equipment which is difficult to perform double-sided counterpoint welding on the curved-surface thin plates is replaced, and the production efficiency is improved. The multiple short rods on the upper fixing base and the lower fixing base can conduct adaptive clamping according to the curved surface shapes of the thin plates, the welding precision and stability are improved, welding deviation caused by the irregular curved surface shapes of the thin plates is avoided, the two oppositely-arranged laser welding heads can flexibly move to the upper and lower opposite seams of the two curved surface thin plates, and the welding quality is improved. And laser double-face simultaneous welding is achieved, the welding efficiency is improved, a welded joint is firmer, and the overall welding quality is improved.

The invention relates to the technical field of pipe fitting laser welding, and discloses a laser welding device and process for machining a large-diameter thin-wall low-thermal-expansion alloy pipe, and the laser welding device for machining the large-diameter thin-wall low-thermal-expansion alloy pipe comprises a machine body, a welding table arranged on one side of the machine body, and a supporting assembly arranged on the welding table and used for supporting. The two alloy pipes are arranged at the top of the supporting assembly and used for welding, the laser welding gun is arranged on the welding table and located on one sides of the alloy pipes, the rotating motor is arranged on one side of the machine body, the clamping base is arranged on one side of an output shaft of the rotating motor, and the clamping unit is arranged on the clamping base. Local stress concentration is avoided through cooperation of air bag clamping and a moving plate, an air bag cavity of the clamping assembly is matched with the moving plate of the auxiliary assembly to form a two-way pressure control structure, when the air bag is inflated and expanded, directional expansion can be achieved, the clamping contact area can be enlarged, and thin wall sinking caused by point contact or line contact is avoided.

The invention relates to the technical field of laser welding, and discloses a laser welding method for accurately controlling weld penetration. According to the invention, through fusion of coaxial multispectral sensing and a back monitoring unit, multi-dimensional information synchronous acquisition of weld front molten pool morphology, a temperature field and a back thermal radiation signal is realized, and limitation of single sensing is overcome; furthermore, a dynamic instruction is generated based on the extracted multi-characteristic parameters and an adaptive fuzzy PID algorithm, thereby realizing precise closed-loop control of laser energy and heat input, and improving real-time performance and robustness of control. Particularly, a digital twin model is introduced to carry out forward prediction, cross validation is carried out with back monitoring signals, a triggered lead compensation mechanism effectively overcomes hysteresis of traditional feedback control, finally, precision control and stable forming of weld penetration are achieved, the defects of incomplete penetration, burnthrough and the like are effectively avoided, and the welding quality is improved. And the device is particularly suitable for occasions with extremely high welding quality requirements.

The application discloses a kind of thick gauge 430 ferritic stainless steel laser weld low-temperature rollability processing method, comprising: using-1~‑2mm negative defocusing+8~10kW low-power laser welding, the grain of heat-affected zone is refined;NiCr-3 welding wire is preheated to 300~400℃ and carried out hot wire laser welding, reduces cooling rate;Weld is implemented 700 DEG C / 10-12 seconds short time induction annealing, decomposes martensite and releases residual stress;Weld is inducted to ≥50 DEG C before rolling and restores plasticity;Optimize five rack continuous rolling parameter, and the reduction of first rack is reduced to 15%-20%.The application is by welding-heat treatment-rolling whole process synergic control, makes weld low-temperature cracking rate from 2.6 times / month reduce to 1 times below, and-10 DEG C impact toughness is promoted to 22J, cup convexity qualification rate reaches 95%, and annual economic benefit is greatly improved, applicable to the thickness 3.0~8.0mm 430 stainless steel cold rolling production, solves the technical problem that thick gauge 430 stainless steel weld is easy to crack under low-temperature environment.

The invention provides a narrow gap swing laser welding pool wettability prediction method based on CFD simulation. The method comprises the following steps that an interaction platform is constructed through Python + PyQt5, and geometric modeling, UDF compiling and a material library module are integrated; the groove parameters and the swing track are dynamically loaded to a Fluent solver, and a full-coupling transient model of a steam recoil pressure-buoyancy-molten drop mass source item is established; in CFD-POST, the widest section of the molten pool is positioned on the basis of the contour surface with the volume fraction being 0.5, and Z-direction displacement-flow velocity data are extracted along the two side wall surfaces; fusing defects are predicted through double criteria of a bilateral average flow velocity difference threshold value and F test variance homogeneity; according to the method, dynamic quantitative evaluation of wetting behaviors can be achieved, the process development period is shortened, the defect detection rate is increased, and the method is suitable for aerospace thick plate welding quality control.

The invention relates to the technical field of iron tower foot welding, in particular to an iron tower foot welding device convenient for supporting adjustment, which comprises an iron tower foot welding device main body, and an iron tower foot supporting center is arranged above the iron tower foot welding device main body. The iron tower foot welding device has the beneficial effects that the iron tower foot supporting frame is designed, and the transverse adjusting frame and the vertical adjusting frame in the iron tower foot welding device can be flexibly adjusted according to the size of a bottom plate of the tower foot, so that the bottom plate is limited and locked; the steel plate multi-direction adjustment limiting frame can limit the supporting steel plate installed on the steel plate according to the position of the bottom plate, multi-direction adjustment can be achieved, and splicing seams which are perpendicular to one another in three different directions can be limited; a laser welding head assembly designed on the outer side of the welding limiting frame is matched with a rotating limiting frame and a rotating limiting plate on the steel plate multi-direction adjusting limiting frame in a limiting mode, and right-angle welding of a splicing seam is accurately completed.

The present invention provides a local dry underwater laser welding multi-shielding gas filler wire drainage device, comprising an adjustable straight pipe, a connecting module, a drainage cover, a nozzle, and a wire feeding pipe. The connecting module is provided with a welding shielding gas inlet hole; the connecting module, the adjustable straight pipe, and the nozzle are sequentially connected from top to bottom and jointly form a long straight through path; the welding shielding gas inlet hole is communicated with the long straight through path; the drainage cover is sleeved on the outer side of the adjustable straight pipe to form a drainage cavity having a downward opening; the drainage cover is provided with a drainage gas inlet hole, and the drainage gas inlet hole is communicated with the drainage cavity; a fixing channel is formed on one side of the drainage cover; the wire feeding pipe extends into the drainage cavity from the fixing channel; a third gap is formed between the inner wall of the fixing channel and the outer side of the wire feeding pipe; a welding wire shielding gas inlet hole is formed in the wall of the fixing channel; the welding wire shielding gas inlet hole is communicated with the drainage cavity by means of the third gap. The drainage device can satisfy the requirement of underwater filler wire laser welding, and relates to innovative use of welding wire shielding gas to ensure that welding wires are in a dry state, thereby effectively improving the quality of filler wire welding.

The invention relates to the technical field of diamond saw blades, in particular to a laser welding diamond saw blade for ultra-narrow slit cutting and a preparation method of the laser welding diamond saw blade. The copper-cobalt-tin alloy material comprises the following raw materials: copper-cobalt-tin alloy powder, tungsten carbide powder, titanium-aluminum nitride, spherical cobalt powder, rare earth yttrium powder, ferrophosphorus powder and diamond abrasive particles. According to the preparation method, the core of the preparation method lies in the combination of powder metallurgy prefabrication of the tool bit and the precise laser welding process, especially the innovative laser welding process, and the prepared diamond saw blade is high in welding seam strength, narrow in heat affected zone and extremely small in matrix deformation; the problems of base body deformation, insufficient welding seam strength, short service life and the like of a traditional saw blade in the ultra-narrow seam cutting process are solved, and the saw blade is perfectly suitable for ultra-narrow seam cutting scenes with extremely high requirements for precision and stability.

The invention provides a laser welding method for an unequal-thickness heterogeneous hot-formed steel joint by cooperatively regulating and controlling annular light spots and light beam deflection. The method comprises the following steps: firstly, pretreating, clamping and positioning the PHS1500 and PHS2000 unequal-thickness ultrahigh-strength steel plates; then, the deflection angle of the light beam is adjusted to be within the range of-30 degrees to + 30 degrees; and finally, a galvanometer control system is used for driving a laser beam to conduct swing scanning in a circular track, and welding is completed under the condition that parameters such as laser power, welding speed, swing frequency, the ratio of swing amplitude to core ring energy and the like are set. According to the method, wire filling is not needed, the PHS1500 and PHS2000 butt welding joints can be effectively connected within the light beam deflection angle range of-30 degrees to + 30 degrees, efficient connection can be achieved within the light beam deflection angle range of-20 degrees to + 20 degrees, weld joint forming is effectively improved, weld joint grains are refined, and the problems of stress concentration and welding softening areas caused by different thicknesses and different strengths of plates are solved. And within the light beam deflection angle range of-20 degrees to + 20 degrees, the obtained joint welding seam is well formed, the tensile strength can reach 1400 MPa or above, and the method is suitable for manufacturing the tailor-welded structure of the unequal-thickness plates of the automobile body.

The invention relates to the technical field of laser welding, and particularly discloses a laser welding device for instrument processing, which adopts double stations with separated pre-clamping and processing, an operator can assemble and disassemble a workpiece at one station and simultaneously perform welding at the other station, so that the waiting time is obviously reduced, and the working efficiency is improved. A linkage clamping mechanism is used for ensuring that a workpiece is kept stable in the rotating switching process and is automatically converted into a high-locking-force state after reaching a machining station, the risk that the workpiece is turned over in traditional equipment is avoided, continuous, efficient and safe operation is achieved, and the device integrates the optical path adjusting and cleaning functions for the pollution problem of an optical system, so that the production efficiency is improved. When the laser angle is adjusted, the scraping strip is synchronously driven to remove pollutants on the light-transmitting plate, the maintenance period is prolonged, the stable welding quality is guaranteed, in addition, laser beam deflection is achieved through a worm and gear and a reflector structure, obstacles can be bypassed to weld hard-to-reach areas such as deep cavities and corners, the process of disassembling and reassembling is avoided, and the production integrity and efficiency are improved.

The application discloses a kind of film microchannel laser welding equipment and its laser welding method, which belong to film welding technical field, including laser machine, film feeding machine, film crimping fixture;Film feeding machine includes material roll, film guide wheel, one-way film feeding device, film pulling device, film supporting device, transfer device, film cutting device;Film crimping fixture first film receiving lifting device, feeding device, second film receiving turnover device, and the compression device of compression.This equipment can realize the automatic feeding, cutting and transfer of first film and second film, and also realize the automatic positioning and compression between first film, connecting pipe, second film and spacer, and can perform laser welding on first film, connecting pipe and second film to automatically produce film microchannel product, thereby improving the degree of automation of film microchannel product, improving production efficiency, reducing production cost and ensuring yield.

The invention discloses a left-right double-end laser automatic welding jig system and a welding method, relates to the technical field of laser welding, and is suitable for carrying out laser welding on joint seams of the left corner and the right corner of two metal plate bent parts in a jig after the two metal plate bent parts are automatically loaded in a left-right balance arrangement mode. The system comprises a jig body, an opening and closing mechanism, a seam reducing and pressing mechanism, a left laser welding head, a right laser welding head, a detection interlocking unit and a control unit. The jig body is provided with a bearing platform, a fixed reference part and a center limiting part, the fixed reference part is sleeved with the metal plate bending parts, and the center limiting part is located between the two metal plate bending parts and outwards presses the two metal plate bending parts in an elastic sliding mode; the control unit triggers the left laser welding head and the right laser welding head to perform synchronous welding when judging that the opening and closing mechanism and / or the seam reducing and pressing mechanism is in the in-place state and the gap value of the corner joining seam meets the preset welding condition, and performs ignition interlocking when the condition is not met; therefore, the stability of the corner joining seam and the welding quality consistency are improved.

The invention discloses a door body welding tool, and belongs to the technical field of laser welding. A door body welding tool comprises a base and a door frame fixedly placed on the surface of the base, a plurality of hinge plates to be welded are placed on the surface of the door frame, a plurality of fixing frames corresponding to the hinge plates in position are fixedly installed on the surface of the base, sliding seats matched with the fixing frames are slidably connected into the fixing frames, and sliding frames are fixedly installed on the surfaces of the sliding seats. A first spring is elastically connected between the sliding base and the fixing frame, and two sliding blocks are correspondingly connected into the sliding frame in a sliding mode. Compared with traditional welding equipment, the door body welding tool has the advantages that the welding distance between the laser welding head and the hinge plate can be automatically adjusted according to the hinge plates with different thicknesses, then the adaptive welding distance between the laser welding head and the hinge plate is guaranteed, the problem that the thick hinge plate is not firmly welded is solved, and the welding efficiency is improved. And meanwhile, the problem of welding penetration of the thin hinge plate is solved, so that the welding quality of the hinge plate is improved.

The invention discloses a welding mistake proofing device for a new energy automobile welding part, and relates to the technical field of welding equipment. The laser welding device comprises a base, an adjusting ring is arranged on the top of the base, and a laser welding head is installed in the adjusting ring; a detection assembly is arranged at the top of the base and comprises a supporting shell installed on one side of the adjusting ring. Through the synergistic effect of the detection assembly and the adjusting assembly, real-time monitoring and angle dynamic adjustment of the fitting degree of two sets of pipeline workpieces are achieved, a pressure sensor can accurately recognize the eccentricity or dislocation problem during pipeline butt joint through pulley stress feedback, a driving motor is matched with a belt transmission system to drive an adjusting ring to rotate, and the fitting degree of the two sets of pipeline workpieces is adjusted. Compared with a traditional single-pipeline clamping device, the alignment problem during double-pipeline splicing is effectively solved, the problems of insufficient weld joint strength, poor sealing performance and the like caused by eccentricity are avoided, and the welding quality and the reliability of a new energy automobile pipeline system are remarkably improved.

The invention belongs to the technical field of welding equipment, and particularly relates to an intelligent high-speed laser welding device for a longitudinal welded pipe, which comprises a rack, a high-precision clamping mechanism, a multi-degree-of-freedom motion platform, a laser welding head and an intelligent control system. The clamping mechanism adopts hydraulic pressure to drive an arc-shaped clamping plate to realize self-adaptive centering and flexible clamping of the pipe fitting; an X-direction module of the motion platform adopts a servo motor to be matched with a synchronous belt (or a ball screw) for transmission, and a Y-direction module is driven by a hydraulic cylinder, so that precise track control of the laser welding head is jointly realized; the intelligent control system integrates visual tracking of welding seams, infrared monitoring of a molten pool and laser detection of deformation, and welding parameters and motion trails are dynamically adjusted by calculating a welding quality coefficient in real time and based on a threshold value and a residence criterion. According to the method, the problems of welding seam tracking lag, unstable molten pool state, thermal deformation compensation deficiency and the like in high-speed welding are solved, and self-adaptive optimization and full data tracing in the welding process are achieved.

The invention belongs to the technical field of laser welding, and particularly relates to a novel battery shell laser welding device which comprises a control cabinet and a welding table fixedly mounted at the top of the control cabinet, a laser welding head is arranged above the welding table, the novel battery shell laser welding device further comprises a supporting displacement unit mounted at the top of the welding table, and a laser welding head is arranged above the supporting displacement unit. The supporting displacement unit is used for driving the laser welding head to move along the seam of the battery shell; the roller is arranged on one side of the supporting displacement unit, and the supporting displacement unit is used for driving the roller to roll along the seam of the battery shell. Residual air in the welding seam can be effectively exhausted, defects such as air holes can be reduced, the density and mechanical property of the welding seam can be improved, bulging deformation of the welding seam can be restrained, assembling interference is avoided, meanwhile, high-temperature oxidation can be prevented through inert gas injection, cooling and shaping of the welding seam are assisted, temporary anti-oxidation protection is conducted on the welded welding seam, and the welding seam quality is improved. The oxidation degree is reduced.

The invention belongs to the technical field of power control, and particularly relates to a handheld laser welding head power control method and system based on the molten pool temperature, and the method comprises the following steps: obtaining a molten pool temperature sequence collected by a coaxial temperature sensor of a handheld laser welding head in real time; the polynomial order of a Savitzky-Golay filter is dynamically adjusted based on the second-order time derivative of the molten pool temperature sequence, the molten pool temperature sequence is filtered, and a real-time molten pool temperature measurement value is obtained; on the basis of the real-time molten pool temperature measurement value and the first-order time derivative of the real-time molten pool temperature measurement value, a preset arcing temperature threshold value, a steady-state temperature interval and a process adjustment gradient threshold value are compared, and it is judged that the current welding process is in one of the three stages of arcing, steady-state welding or arc suppression pit filling; when the steady-state welding phase is determined, the temperature deviation between the target temperature and the real-time molten pool temperature measurement value is calculated. Differential power control strategies for different process stages are achieved, and the overall quality and consistency of handheld laser welding are improved.

The invention provides a femtosecond and picosecond composite laser welding method and equipment for heterogeneous materials. The femtosecond and picosecond composite laser welding method specifically comprises the steps that glass and metal are stacked on a three-dimensional motion platform and clamped through a clamp; femtosecond laser (with the pulse width of 50-1000 fs and the peak power density of 10-10 W / cm) and picosecond laser (with the pulse width of 1-200 ps and the peak power density of 10-10 W / cm) are adjusted by different beam expanding systems, and after focusing, picosecond light spots completely wrap femtosecond light spots; the composite laser acts on a welding area and a femtosecond laser focusing interface in a time-space synchronization mode, plasma is excited to enable metal to be melted to fill gaps, picosecond laser forms a wide-area heating field on the femtosecond periphery, a violent temperature gradient is regulated and controlled to be in a gentle state, the preheating and after-heating effects are achieved, cracks are restrained, absorption is enhanced, and the welding strength is improved; and the composite laser is controlled by a control system to weld according to a specified path, so that high-strength connection of the glass / metal heterogeneous materials is realized. And the method becomes a breaking key for regulating and controlling the temperature gradient, inhibiting crack generation and improving the welding strength.

The invention relates to an inner cavity curved surface welding line laser light path turning welding method which is used for solving the technical problem that an existing welding method is difficult to operate when curved surface welding is carried out in an inner cavity, and the method comprises the steps that a reflecting mirror is arranged on a light emitting path of a laser welding head, and original laser beams are deflected; the laser beam enters the inner cavity space and irradiates the to-be-welded area of the curved surface weld joint; surface cleaning and fixing are conducted on a to-be-welded area, and the folded laser beams are focused to the center of a welding seam; enabling the laser beam to perform scanning welding on the curved surface welding seam according to a preset scanning track; in the welding process, protective gas is jetted to the position, acting on the workpiece, of the laser beam so as to blow away welding spatter and provide gas protection for a welding seam. The propagation direction of laser beams is changed through the reflecting mirror, so that laser can enter the inner cavity to weld a curved surface weld joint, the application range of laser welding is expanded, and the problem that curved surface welding is difficult to operate in the inner cavity space through an existing welding method is solved.

The invention relates to the technical field of high-power femtosecond laser manufacturing, and discloses a high-power industrial femtosecond laser water cooling structure and a manufacturing method thereof. Comprising the steps that any one of a variable cross-section spiral flow channel, a bionic fin flow channel or a micro-channel array is directly machined in a machine shell water-cooling plate through the five-axis linkage precision machining technology or the micro-nano machining technology, or the printer shell water-cooling plate is integrated through the metal additive manufacturing technology; a reflector base, a heat dissipation chute and a cooling water channel are integrated in the machining process of the water cooling plate of the machine shell; carrying out material and surface treatment process operation; assembling process operation is carried out, a reflecting mirror base is matched with a mortise and tenon joint structure and a machine shell water-cooling plate through high-precision positioning pins, the reflecting mirror base and the machine shell water-cooling plate are rigidly connected in a vacuum brazing or laser welding mode, and a light guide side plate and a runner cover plate are designed into standard modules; the light guide side plate and the runner cover plate are quickly assembled through magnetic attraction positioning and spring buckles.

The invention relates to the technical field of laser welding, and provides a high-speed laser welding wire box process based on multi-beam synergy, which comprises the following steps: step 1, at least three laser beams are adopted as a synergy composite heat source, a main laser beam is responsible for penetration fusion welding, and an auxiliary laser beam is responsible for preheating, post-heating or molten pool stabilization; when the copper-aluminum dissimilar material is welded, an auxiliary laser beam is switched into a green laser; and 2, assembling a multi-beam optical regulation and control unit comprising a diffractive optical element, a quartz field lens and a galvanometer scanning module, splitting a main beam into one main beam and two auxiliary beams through the diffractive optical element, controlling focal depth fluctuation by the quartz field lens, and realizing accurate movement positioning of a laser beam by the galvanometer scanning module. Through integration of multi-beam collaborative design and an intelligent control unit, remarkable breakthroughs are achieved in the aspects of welding efficiency, quality consistency and process adaptability, firstly, in the aspect of efficiency and process, the welding speed is greatly increased, multi-station synchronous operation of an automatic welding unit is matched, and the welding period of a single-line box is remarkably shortened.