709 results about "Heat-affected zone" patented technology

The invention discloses a weldment welding seam automatic detection method and device based on machine vision, and relates to the technical field of machine vision intelligent detection. The weldment welding seam automatic detection method and device based on machine vision comprises the steps that S1, surface images and forming feature data of a weldment are collected and preprocessed to construct a standardized image feature data set; s2, the boundary clearness of the weld joint is evaluated by combining the edge strength and the contour coherence, and the main contour extraction range is dynamically adjusted; s3, analyzing abnormal focusing characteristics of the candidate area, and adjusting a defect labeling range and a detection priority; and S4, integrating the boundary definition and the abnormal focusing features, analyzing the structure abnormality, and dynamically controlling and verifying a resource allocation strategy. The problems that in the weldment detection process, obvious light reflection and texture blurring phenomena exist in a heat affected area at a weld joint, a traditional image enhancement and edge extraction algorithm is difficult to stably recognize microdefects, and the credibility of a detection result is reduced are solved.

The invention relates to the technical field of automatic welding control, and particularly discloses a multi-station automatic welding cooperative control method for electric iron accessories, which realizes full-closed-loop accurate control of a welding process through multi-sensor data fusion and an intelligent optimization algorithm. According to the method, an infrared thermal imager, an acoustic emission sensor and an ultrasonic thickness measuring device are adopted to collect molten pool temperature field, sound wave frequency spectrum and fusion depth data in real time, after feature extraction, the data are input into a multi-target optimization model, and a Pareto optimal solution set is generated with the fusion depth, the width of a heat affected zone and phase change latent heat as optimization targets; dynamically adjusting a segmented welding-back path and process parameters on the basis of an optimization result, and triggering model iterative correction through ultrasonic online monitoring; the central control unit adopts space voxelization monitoring and a three-level collision avoidance strategy to coordinate operation of the multiple mechanical arms, and collision emergency protection is achieved in combination with flexible pressure sensing.

The invention relates to the technical field of welding platforms, in particular to a multifunctional welding process experiment platform and a process optimization system.The process optimization method comprises the following steps that a welding process setting module is constructed, and a welding mode, a groove type and a heat input scheme are preset; outputting the initial process configuration parameter set to drive a welding execution unit to perform automatic welding operation according to the initial process configuration parameter set; extracting a multi-dimensional process response vector including a stability index, metal fusion depth distribution and a heat affected zone expansion degree; outputting a welding seam grade result according to a preset quality grading standard, and generating a feedback identifier; and after updating, inputting to the step S2 again to form closed-loop optimization control. According to the method, digital modeling and evaluation of key indexes such as the welding stability, the fusion depth and the heat affected zone are achieved, and the problem that a traditional process depends on visual inspection and experience judgment is solved.

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 belongs to the technical field of hard and brittle crystal material micropore machining, and particularly relates to an ultra-precision micropore multi-energy field coupling machining method and system.The method comprises the steps that the laser pulse frequency and power are set according to the workpiece material type and the micropore depth-diameter ratio, and a laser focus is positioned at the inner hole bottom of a workpiece; a modified structure extending in the axial direction of a hole is formed by controlling matching of a light spot and a hole diameter and the movement track of the light spot, in the machining process, a plasma nozzle and laser coaxially move, a modified area is removed in real time, a heat affected zone and the hole shape taper are restrained, meanwhile, vibration is applied to a workpiece through an axial ultrasonic vibration device, and machining precision is improved. And chip discharge is promoted, and stress and crack generation are reduced. The problems of serious thermal damage, poor hole shape precision, low machining efficiency and high energy consumption in the micropore machining process in the prior art are solved, and high-quality and high-precision machining of the high-depth-diameter-ratio micropore of the hard and brittle transparent crystal material is achieved.

The invention discloses a connecting method of an FGH99 double-radial-plate turbine disc based on a nanocrystallization high-entropy alloy middle layer, and belongs to the technical field of welding. A high-entropy alloy middle layer is adopted, nanocrystallization treatment is combined to optimize a microstructure, the nanocrystallization high-entropy alloy middle layer is arranged between an upper FGH99 double-radial-plate turbine disc and a lower FGH99 double-radial-plate turbine disc, diffusion connection is conducted in a vacuum diffusion welding furnace, and the welded FGH99 double-radial-plate turbine disc is obtained. Low-damage solid-phase diffusion bonding is achieved at the welding temperature lower than the solid solution temperature of base metal; meanwhile, the nanocrystallization interlayer structure promotes element diffusion, the diffusion welding period can be greatly shortened, the problems of grain coarsening and performance degradation of a heat affected zone caused by long-time heat preservation in a traditional technology are solved, the technical bottleneck of cooperative regulation and control over the strength and toughness of a high-temperature alloy complex component connection interface is broken through, and the application prospect is wide. And a high-reliability solution is provided for efficient manufacturing of the double-radial-plate turbine disc of the aero-engine, and the double-radial-plate turbine disc is particularly suitable for the long-service-life service requirement under the working conditions of extreme high temperature and cyclic loads.

The invention discloses a laser pipe cutting machine with a cooling system, which is characterized in that the outer side of a laser cutting head is sleeved with a heat dissipation suite, an inner water cavity and an outer water cavity which are communicated with each other are arranged in the heat dissipation suite, cold air pipelines are arranged in the two water cavities, and the bottom of the heat dissipation suite is connected with an air blowing box; the bottom of the air blowing box is connected with a lantern ring arranged on the lower portion of the laser cutting head in a sleeving mode, and a cold water cavity is formed in the lantern ring. A fixed seat is mounted on the outer side wall of the front chuck, and a water bag for cooling the pipe is arranged on the inner ring of the fixed seat; cold air downwards blows away hot air generated by cutting after cooling the water body, and heat interference is reduced; the outer water cavity accurately controls the water flow direction through the inflation amount of the air bag, closed circulation of extrusion-cooling-backflow-mixing is formed, and therefore the cutting head is always kept in the low-temperature working state, the service life of equipment is prolonged, and the cutting stability is improved. The problems of notch hardening and oxidation of stainless steel, aluminum alloy and other metal pipes are effectively reduced, a heat affected zone is reduced, and the notch quality is improved.

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 relates to the technical field of automobile part machining, and discloses a sheet punching device for automobile part machining, which comprises a punching table, and further comprises a recycling hopper fixedly connected to the bottom of the punching table, and a rectangular hole is formed in the punching table and used for recycling punching leftover materials into the recycling hopper; the support is fixedly connected to the bottom of the recycling hopper and used for supporting the recycling hopper and the punching table; and the moving mechanism is arranged above the punching table and is used for moving a welding gun head mounted on the moving mechanism. The lower adjusting rod driven by the two-way threaded rod and the upper adjusting rod pre-tightened by the spring form'up-down elastic clamping ', and can automatically adapt to a thin plate; in the clamping process, the first spray hole and the second spray hole spray inert gas synchronously, local protective atmosphere is formed on the upper surface and the lower surface of the notch, oxidation ablation is reduced, the hole edge heat affected zone is reduced, and the precision requirement of the high-strength welding hole of the automobile is met.

The invention relates to the technical field of coal mine supporting, in particular to a segmented collaborative welding process of a top beam hydraulic support. The method comprises the following steps: sequentially welding a plurality of rib plates and paired main rib pre-assemblies on the bottom surface of a top plate step by step, wherein the rib plates and the paired main rib pre-assemblies form the supporting rib assembly; and a first cover plate is arranged between the paired main reinforcement pre-assemblies, and welding is conducted along gaps between the first cover plate and the main reinforcement pre-assemblies to preset sub-welding points determined based on the thickness of the column socket base. And the column nest assembly is arranged on the side, away from the supporting rib assembly, of the first cover plate, and then the vertical edge of the column nest base is connected with the main rib pre-assembly in a welded mode. And the second cover plate is arranged between the column nest base and the first cover plate, and welding connection is carried out. And the first cover plate, the second cover plate and the column nest assembly located in the area below the branch welding points are welded to gaps between the main reinforcement pre-assembly. According to the welding process, the welding stress in the supporting rib assembly can be reduced, and the problem that the welding quality is poor due to superposition of heat affected zones of welding joints is solved.

The invention discloses a flange plate welding deformation compensation device, which relates to the technical field of welding, performs targeted constraint force adjustment on a local heat affected zone in a flange plate welding process by virtue of a synergistic effect of a partitioned flexible constraint assembly and an annular supporting and positioning assembly, and is different from a uniform constraint mode of a traditional integral rigid device. In the process, independent pressure control and air pressure adjustment are carried out through all the subarea air cavities, and in cooperation with real-time feedback of a temperature sensor and a laser displacement sensor, the constraining force of different areas can be dynamically changed, so that the restraining accuracy is improved. According to the method, stepped force control from initial pre-constraint to local reinforcement constraint to cooling and pressure maintaining is achieved, the mode can be matched with the local deformation trend generated by non-uniform heating of the flange plate in a more targeted mode, overall and local deformation of the flange plate in the welding process is effectively restrained, and compared with a traditional overall constraint mode, the method is more accurate.

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 battery, a battery pack and electric equipment. The battery comprises a shell and a cover plate. The cover plate is welded with the opening part of the shell. The housing includes a short side wall provided with a short wall edge and a long side wall provided with a long wall edge. The short wall edge and the long wall edge constitute at least part of the opening. A first convex part is convexly arranged on the inner side surface of the short side wall towards the battery core. The cover plate comprises a short edge and a long edge. The long edge is welded with the long wall edge, and the short edge is welded with the short wall edge. The size of the first convex part in the second direction is a1, the size of the short side wall in the second direction is a2, the short side length is b1, the long side length is b2, and the hardness of the heat affected zone is c. By selecting the value of the formula within the range of 10 * 10 <-4 > HV-1 to 4500 * 10 <-4 > HV-1, the battery not only has lower cracking risk at the short wall edge and the short edge welding part, but also has lower risk of opening the explosion-proof valve under the unexpected condition.

The invention discloses a thermal-mechanical-metallurgical coupling numerical simulation method for low alloy steel welding and additive manufacturing, which comprises the following steps of: S1, constructing a three-dimensional model of a test piece according to the geometric size and the size of a heat affected zone of the test piece after welding or additive manufacturing, performing grid division to form grid units, and endowing the grid units with material attributes; s2, endowing the grid units with thermophysical attributes, introducing an external heat source model, solving the change of a temperature field along with time by using a finite element method until all the grid units are cooled to a set environment temperature, and exporting a temperature field model; s3, simulating a phase change process under any thermal process; and S4, calculating a stress-strain field and a displacement field by taking the temperature field model in the step S2 and the phase fraction model in the step S3 as driving external force. The temperature, phase fraction, stress-strain and displacement changes in the low alloy steel welding and additive manufacturing process can be predicted and analyzed faster and more comprehensively, the design period is shortened, and the economical efficiency of the implementation process is promoted.

The invention discloses an air cylinder welding device for magnetic resonance equipment, and relates to the technical field of welding equipment.The air cylinder welding device for the magnetic resonance equipment comprises a feeding mechanism and a polishing mechanism, and a welding assembly and a dust removal assembly are arranged on the surface of the polishing mechanism; the feeding mechanism comprises a limiting supporting seat, a limiting round hole is formed in the surface of the limiting supporting seat, a movable supporting ring is rotationally connected to the inner wall of the limiting round hole, and a clamping assembly is arranged on the inner wall of the movable supporting ring. The welding quality can be improved, the segmented skip welding strategy is adopted, the length of a single-section welding seam is smaller than or equal to 5 mm, a heat affected zone in the welding process is effectively controlled, welding deformation is reduced, the welding quality and the overall strength of an air cylinder are improved, the automation degree is high, and the feeding mechanism, the polishing mechanism and the welding assembly are integrated; the automatic production process of the air cylinder from feeding, welding to polishing is achieved, manual intervention is reduced, and the production efficiency is improved.

The invention relates to the technical field of laser cutting equipment, in particular to a laser cutting machine for cutting a machine tool body and a cutting technology.The laser cutting machine comprises a cutting table, a fixing frame arranged at the top end of the cutting table and a laser cutting head arranged at the bottom end of the fixing frame; according to the laser cutting device, when the to-be-cut area of the cover plate is cut, stable and continuous extrusion constraint can be formed, thermal expansion force generated when the long and thin groove is cut is effectively counteracted, groove wall bending and groove width deviation are reduced, and the size precision needed by precise threading and guiding of the long and thin groove is guaranteed; the heat conduction block on the abutting plate can rapidly guide out cutting heat, and in cooperation with directional blowing of the blowing assembly, heat dissipation can be accelerated so as to reduce a heat affected zone, improve the smoothness of a notch, ensure stable and reliable cutting quality, reduce subsequent assembly problems caused by thermal deformation and ensure stable and reliable cutting quality of metal manufacturing equipment during batch machining. And the overall processing efficiency of the metal manufacturing equipment is further optimized.

The invention relates to the technical field of friction stir repair, and discloses a multi-dimensional defect friction stir solid-phase repair planning system and a defect repair method. The system comprises a defect acquisition unit for acquiring multi-dimensional defect data of a workpiece and generating a time-space correlation data set covering defect depth distribution, a material heat affected zone range, a friction tool wear state and environment temperature and humidity parameters; the feature reconstruction unit decomposes the data set and separates core and abnormal feature tensors; the repair planning unit generates a multi-region cooperation scheme containing a tool path, a pressure sequence and a rotating speed strategy in combination with the core features and the process constraints; the dynamic adjusting and optimizing unit monitors abnormal characteristics and adjusts the scheme when conditions are met; the collaborative strategy unit responds to cross-regional defect linkage abnormity, allocates a standby tool and updates a track offset; and the feature fusion unit fuses the multi-scale monitoring features to generate a repair quality evaluation feature set. The system enhances the comprehensiveness and adaptability of complex defect repair.

The invention discloses a life health management method and system for an HR3C material, and relates to the technical field of data processing, and the method comprises the steps: collecting the operation condition data of the HR3C material in a service state, carrying out the creep, fatigue and creep-fatigue interaction performance testing of a welding seam and a heat affected zone, and obtaining the real-time service state data; combining a high-temperature accelerated aging test result to construct a structure-performance coupling model; and performing microscopic damage calculation and residual life prediction based on the organization-performance coupling model and the real-time service state data, and generating a health assessment index to execute health management. The technical problems that in the prior art, damage evolution of the HR3C material under the complex high-temperature working condition cannot be accurately evaluated in real time, and the service life prediction and health management precision is insufficient are solved, and the purposes that through performance coupling analysis and aging process feedback under the multiple working conditions, microcosmic damage is accurately evaluated, and the remaining service life is dynamically predicted are achieved. And the health management precision is improved.

The invention belongs to the technical field of intelligent welding, and discloses a welding part design method and system for welding a multi-section target material, and the method comprises the steps: scanning the multi-section target material through laser scanning and visible light imaging equipment, and obtaining the assembly three-dimensional shape of the multi-section target material; identifying a welding seam area based on the assembly three-dimensional shape, and extracting geometric deviation characteristics of the welding seam area; on the basis of the geometric deviation characteristics of the weld joint area and the thermal expansion characteristics of the welding material, according to a preset groove design rule, dynamically-matched groove design parameters are generated; the method comprises the steps that thermal infrared image data and strain field data in the welding process are collected, a thermal-mechanical coupling welding process simulation model is constructed, strain concentration and residual stress distribution of a heat affected zone in the welding process are analyzed, the strain concentration area distribution characteristics of the heat affected zone are obtained, and then a welding seam path with a fractal structure is constructed; and the overall quality and performance of the welding part of the multi-section target material are improved.

The invention discloses a heat-treatment-free control method for inhibiting hydrogen-induced cracks in ultrahigh-strength steel welding, which belongs to the technical field of welding, and enables weld metal to obtain a low-phase-transition-temperature characteristic and a double-phase structure containing retained austenite under a specific dilution rate window by cooperatively regulating and controlling components of a welding material and welding process parameters. Therefore, preheating-free and post-heat-treatment-free efficient welding of the ultrahigh-strength steel is achieved. According to the method, the volume expansion effect generated by low-temperature martensite phase transformation of weld metal is utilized to actively counteract restrained tensile stress formed by welding cooling shrinkage; on the other hand, the effect of the retained austenite serving as an efficient'hydrogen trap 'is fully played, migration and enrichment of hydrogen to crack sensitive areas such as a heat affected zone or a fusion line are effectively blocked, and finally effective inhibition of hydrogen-induced cracks in ultrahigh-strength steel welding is achieved; the obtained welding joint is free of hydrogen-induced cracks and has the mechanical property level well matched with base metal.

The invention relates to the field of intelligent welding processes and control, and discloses a welding method for a superhard material sealing body multilayer structure. Comprising the steps of obtaining multilayer structure data, and generating a three-dimensional digital model; energy input parameters are optimized according to the heat affected zone and the stress concentration zone, and an initial energy tuning parameter set is generated; according to the initial energy tuning parameter set, temperature field data and stress field data in the welding process are collected, and the dynamic heat affected zone change trend is obtained; according to the change trend of the dynamic heat affected zone, adjusting energy input and a scanning path, and generating a corrected energy tuning parameter; controlling depth distribution of energy in the multilayer structure according to the corrected energy tuning parameters to obtain fusion depth and heat affected zone distribution; energy input and scanning speed are adjusted according to the fusion depth and the heat affected zone distribution, and an energy input parameter set is generated. The precision of energy control in the welding process is improved.

The invention discloses a laser cutting device and method for livestock ear tags, and belongs to the technical field of laser cutting. The laser cutting device comprises a supporting plate, a laser head and a control assembly are arranged above the supporting plate, the laser head is installed in the control assembly, and the control assembly is used for controlling the laser head to move in the X-axis direction and the Y-axis direction; a plurality of sets of photoelectric distance measuring sensors are installed outside the outer side of the laser head and evenly distributed on the outer side face of the laser head. According to the method, only a preset thickness is cut each time in a layer-by-layer cutting mode, so that heat generated by cutting each layer is relatively less, local overheating is avoided, a heat affected zone is reduced, the cutting quality is improved, in the cutting process, the temperature value of a cutting point is detected in real time through an infrared thermometer, and the cutting efficiency is improved. And the cutting power of the laser head is dynamically adjusted according to the difference value between the actual cutting temperature and the preset cutting temperature, and it is ensured that the cutting process is stable and efficient.

The invention discloses a dynamic regulation and control device and method for aluminum alloy electron beam welding residual stress, and belongs to the technical field of electron beam machining, and the device integrates a multi-sensing information acquisition system, a vibration system and a control system. The sensing information acquisition system measures the surface residual stress of a welding seam and a heat affected zone in real time and in situ in the welding process through a vacuum compatible X-ray probe and a detector, compares the predicted stress with a target value, and generates a regulation and control instruction of electron beam welding parameters through the control system; the electron beam welding behavior is adjusted in real time to dynamically control stress, and the vibration system is used for applying high-frequency micro-amplitude vibration to a local high-stress area of a weldment to promote residual stress release. The device integrates monitoring, regulation and stress release functions in a vacuum environment, can remarkably reduce welding residual stress and improve welding seam quality, and is particularly suitable for electron beam welding of large thin-wall aluminum alloy structural parts.

The invention belongs to the technical field of laser additive manufacturing, particularly relates to coaxial powder feeding laser cladding metal additive repairing equipment, and provides the following scheme aiming at the problems of high heat input, low bonding strength, large heat affected zone and the like in the existing traditional repairing technology: the coaxial powder feeding laser cladding metal additive repairing equipment comprises a double-stand-column gantry mechanism which comprises two supporting arms; the two supporting arms are fixedly connected with the same cross beam, the cross beam and the two supporting arms are provided with two symmetrical inclined supports, the cross beam is connected with a guide rail and a rack component, the rack component is meshed with a walking gear, and the cross beam is provided with a wheel box. High-precision, high-efficiency and high-quality laser additive repairing of large key components is achieved, and the problems that in a traditional repairing technology, heat input is high, bonding strength is low, and a heat affected zone is large are effectively solved.

To provide a welded joint which has excellent low-temperature toughness, is suppressed in stress corrosion cracking caused by liquefied ammonia, and has 490 MPa or more of tensile strength, and a method for manufacturing the welded joint.SOLUTION: A welded joint has a base metal, a weld metal, and a welding heat affected zone. In the welded joint, each of the base metal and the weld metal has a chemical composition of a specific range, the area fraction of bainite structure from 1 / 4 thickness to 3 / 4 thickness in the sheet thickness direction from the surface of the base metal is 90% or more, Vickers hardness at the 1 mm position in the sheet thickness direction from the surface of the base metal is 210 or less, Vickers hardness in the welding heat affected zone is 210 or less, Vickers hardness in the weld metal is HVW or less (HVW=260-200×Ni), the tensile strength of the base metal and the welded joint is 490 MPa or more, and the absorption energy of the base metal and the weld metal in Charpy impact test is 47 J or more at -40°C.SELECTED DRAWING: None

The invention relates to the technical field of microporous structure processing, and discloses an excimer laser and LIGA process combined microporous structure processing method and system, and the method comprises the following steps: S1, substrate pretreatment, S2, excimer laser photoetching, S3, development and electroforming mold preparation, and S4, injection molding and demolding. The system comprises the following modules: a module M1, an excimer laser module, a module M2, an LIGA process module, a module M3, an online detection module, a module M4 and a multi-material compatible module. According to the invention, the plasma density is inhibited to be below 1016cm <-3 > through a helium environment, the surface temperature gradient of the polymer substrate is synchronously reduced in combination with low-temperature cooling airflow, the width of a heat affected zone is compressed to 1.8 microns from 5 microns in a traditional process, and more than 80% of laser thermal stress is absorbed through a silicon dioxide buffer layer through a synergistic thermal response mechanism of a multi-layer photoresist structure. And interface stripping and microcracks are avoided.

The invention provides a method for processing a micropore by combining vortex beam shaping femtosecond laser with nanosecond laser, which comprises the following steps of: firstly, taking charge of melting and sublimation of a material by utilizing the high-power characteristic of the nanosecond laser, and then taking charge of finish machining of the hole wall of the processed micropore by utilizing the characteristics of small heat affected zone and high peak energy of the femtosecond laser. Therefore, the problems that the heat affected zone of the hole wall of the micropore machined by nanosecond laser is large, and the machining quality of the hole wall is poor due to material melting and recasting are solved. Therefore, the advantages of high efficiency of nanosecond laser micropore processing, small thermal damage area of femtosecond laser material processing and high micropore pattern quality of the processed micropore are combined, coarse and fine synchronous processing is finally realized, and the processing quality of the micropore wall is improved.

The invention discloses a back contact solar cell, a preparation method thereof and a photovoltaic module, and relates to the field of photovoltaic technology. According to the preparation method of the back contact solar cell provided by the invention, the grid line groove is formed in the first passivation layer by using the deep ultraviolet laser, and the deep ultraviolet laser has relatively high photon energy which is higher than chemical bond energy of a passivation layer material, so that chemical bonds can be broken through a photochemical effect instead of depending on a thermal effect to melt the material. The heat affected zone of deep ultraviolet laser grooving is small, generated thermal stress is small, and edge warping of the first passivation layer caused by thermal expansion difference can be restrained. The metal seed layer formed through subsequent deposition can be well attached to the inner surface of the grid line groove and the outer surface of the first passivation layer in the grid line area, the metal seed layer is good in integrity and has good adhesive force, and the manufactured back contact solar cell has good reliability and cell performance.

The invention belongs to the technical field of electric bicycle production, and particularly discloses a laser welding device for electric bicycle frame machining, which comprises a welding chamber, a preheating chamber and a cleaning chamber, and is characterized in that a mounting frame is fixedly mounted on the inner wall of one side of the welding chamber through bolts, and a ball sliding block is slidably connected into the mounting frame; the interior of the mounting frame is rotationally connected with a ball screw through a bearing, the ball screw is in threaded connection with the interior of the ball sliding block, a lifting motor is fixedly mounted on the outer wall of the top of the mounting frame through a bolt, and the output end of the lifting motor is fixedly connected with the ball screw through a coupler; the problems that an electric bicycle frame in a normal temperature state is directly welded, so that a heat affected area is enlarged, the physical performance of a welding area is changed, the welding quality is affected, and heat deformation and stress concentration are generated in the welding process, so that the welding quality is affected are solved. And the overall structural stability and the service life of the frame are influenced.

The utility model discloses non-woven fabric laser cutting equipment capable of reducing corner trimming burrs, and relates to the technical field of laser cutting, the non-woven fabric laser cutting equipment comprises a shell, a cover plate is arranged on one side of the upper end of the shell, a laser cutting piece is arranged in the shell, a control panel is connected to one side of the upper end of the shell in an embedded mode, and the control panel is connected with the laser cutting piece in an embedded mode. The non-woven fabric laser cutting equipment comprises a shell, a placing groove used in cooperation with a control panel is formed in one side of the upper end of the shell, a lower plate is fixedly arranged at the lower end of the shell, and a placing frame is fixedly arranged at the upper end of the lower plate. The laser cutting device is simple in structure and convenient to carry out circular motion so as to cut an arc-shaped structure, corner trimming burrs can be reduced, meanwhile, chips can be conveniently treated in a centralized mode, the laser cutting technology has the advantages of being small in heat affected zone and smooth in cutting face, and in addition, equipment is accurately controlled, the corner trimming burrs can be obviously reduced, and the product quality is improved.