210 results about "Weld penetration" patented technology

The invention relates to the technical field of electronic packaging, in particular to a welding process applied to a double-mesa device. The technology comprises the following steps that firstly, a heat conduction model of a double-table-board device is built, a temperature field prediction system is built in combination with measured data, secondly, an asymmetric double-pulse-current welding strategy is adopted, differential pulse waveforms are loaded to an upper table board and a lower table board respectively, independent temperature control over all welding areas is achieved, a temperature difference closed-loop feedback mechanism is introduced in the process, and the temperature field prediction system is obtained. Pulse parameters are dynamically adjusted according to real-time temperature deviation, a stress prediction and weld penetration monitoring module is used for assistance, the welding spot forming quality and heat stress balanced release are ensured, a staged annealing type cooling mode is adopted after welding, and the structural stability is improved. The method can be widely applied to MEMS modules, SiC power devices and heterogeneous chip laminated packaging double-mesa structure devices, and has the advantages of being high in welding precision, high in reliability and wide in process adaptability.

The invention provides a multi-sensor weld penetration state recognition method for improving an attention mechanism, relates to the technical field of weld recognition, and solves the technical problem of inaccurate weld quality judgment caused by insufficient recognition precision of a single signal on a penetration state in the prior art. According to the technical scheme, a sound signal in the welding process and a molten pool image in the welding process are collected; effective sound signals are extracted, and then the sound signals are visualized by using a Gramer angle field method; performing de-exposure processing on the overexposure area through a decoupling polymerization exposure correction model; a channel attention and space attention mechanism is introduced into sound and image feature extraction, deformable convolution self-adaptive sampling is utilized, a double-cross attention fusion strategy is combined to fuse multi-source information, fusion penetration state classification is completed, and therefore the quality of a welding seam is judged. According to the method, the penetration state can be accurately classified through the sound signal extracted in the welding process and the molten pool image, and a certain thought is provided for weld quality detection.

A method is provided for unsupervised 3D modeling and geometric measurement of additively manufactured parts. The method includes obtaining near-infrared (NIR) images for a welding process for a welded part. The welded part includes welded metal and agglomerated powder particles. The method also includes generating a multi-dimensional dataset based on the NIR images, including cropping the multi-dimensional dataset to a region of interest. The method also includes detecting melted regions in image layers of the multi-dimensional dataset to obtain an output volume. The method also includes detecting agglomerated powder in the output volume to obtain melt masks. Each melt mask indicates weld pixels for a respective image layer. The method also includes applying a multi-layer predictive model to account for multi-layer weld penetration, based on the melt masks, to obtain an output data mask that represents a 3D model and geometric measurements for the welded part.

Disclosed in the present application are a dual-sided laser synchronous welding heat source model establishment method, a dual-sided laser synchronous welding heat source simulation method, a dual-sided laser synchronous welding system, and a medium. Firstly, combined heat sources each comprising a Gaussian cylindrical heat source attenuation model and a Gaussian surface heat source correction model are established, and a dual-sided laser synchronous welding heat source model is established by means of a rotating coordinate system; a three-dimensional geometric model and a three-dimensional mesh model of a T-joint are established; and the consistency between simulated molten metal morphology and an actual weld shape is used as a criterion for determining whether parameter settings of the dual-sided laser synchronous welding heat source model are rational, so as to obtain an optimal finite element simulation heat source model. By establishing two heat sources each obtained by combining a Gaussian cylindrical heat source attenuation model and a Gaussian surface heat source correction model, and symmetrically applying the two heat sources to two sides of a T-joint to act on the interior and surface of a weld, the present invention realizes the accurate simulation of a weld penetration zone in a T-shaped thin-plate weldment, and thus enables the prediction of residual stress and welding deformation during a design phase, thereby optimizing the welding process, improving the welding quality and efficiency, and reducing material waste and production costs.

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 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 device for flange plate machining, and relates to the technical field of welding devices. Comprising an operation table, a plurality of first supporting plates are arranged on the inner wall of a pipeline at equal angles, an inner supporting assembly is arranged on one side of a base, a supporting assembly is arranged on one side of the inner supporting assembly, a plurality of second supporting plates are arranged on the inner wall of a flange at equal angles, an adjusting assembly is arranged on one side of a welding gun, and an abutting assembly is arranged on one side of the flange. By arranging the moving ring, the rolling wheels, the rotating rod and other structures, when the moving ring moves, the rolling wheels in the moving ring are driven to move, and then the rotating rod is driven to rotate, the rotating rod is fixedly connected with the telescopic plate through the connecting shaft, so that the telescopic plate is driven to rotate, and then the angle of the welding gun is adjusted; the angle of the welding gun is changed in a self-adaptive mode through different pipeline wall thicknesses, the weld penetration performance is guaranteed, incomplete penetration or incomplete fusion is avoided, weld forming is optimized, and geometric accuracy is guaranteed.

The invention discloses a laser welding device and method capable of monitoring the welding penetration depth in real time, and belongs to the technical field of laser welding. The laser welding device comprises a laser processing module, a penetration depth measuring module and a control module; the measurement light can accurately enter the molten pool and reflect an echo signal, so that the measurement error caused by light path deviation is avoided; the control module is connected with the fusion depth measuring module and the laser processing module at the same time, transmitting signals and echo signals can be rapidly obtained and real-time fusion depth information can be calculated and analyzed by means of the high-frequency signal transmission and processing capacity, the laser processing module can be controlled to adjust parameters in time when the fusion depth is abnormal, the fusion depth is kept within a set range all the time, and the fusion depth measuring accuracy is improved. High-precision real-time closed-loop feedback from measurement to control is realized, the stability and consistency of welding quality are greatly improved, the rejection rate is reduced, and the production efficiency is improved.

The invention relates to the technical field of steel structure welding, in particular to a full-penetration back-gouging-free welding process for a welding seam between a web plate and a wing plate of a crane beam. Comprising the following steps: preparing a web groove; welding steel plate pairs; web plates and wing plates are placed; backing a weld bead on the groove surface; welding the back surface once; and the other welding beads are formed on the groove surface. According to the full-penetration back-gouging-free welding process for the weld joint between the web and the wing plate of the crane beam, the weld joint penetration depth of groove surface welding and non-groove surface welding can better fuse the joint surface of the web and the wing plate, the sections of the two weld beads can be partially overlapped by selecting proper process parameters, and therefore full-penetration welding is ensured.

The invention provides a welding defect detection method and system and a storage medium, and the method comprises the steps: obtaining a bonding pad welding detection region based on a first battery image of a to-be-detected battery obtained by a lower camera, and obtaining a weld penetration detection result based on the bonding pad welding detection region; obtaining a second battery image of the battery to be detected through the upper camera, and obtaining a welding spot detection result and a welding deviation detection result according to the bonding pad welding detection area and the second battery image; and obtaining a third battery image of the battery to be detected through the lower camera, and obtaining a point explosion detection result and a welding slag detection result according to the second battery image and the third battery image. According to the method, the images shot by different cameras are effectively associated and integrated, so that the detection result is more accurate and reliable; by reasonably arranging the shooting sequence and the detection process of the camera, detection of multiple welding defects can be completed in one detection process at the same time, the tedious process of multiple independent detection is avoided, the detection efficiency is improved, and the requirement for large-scale production is met.

The invention discloses a laser stitch welding multi-layer metal plate self-adaptive adjusting mechanism and laser welding equipment. The adjusting mechanism comprises two hub seats, a driving wheel, a follower wheel, a guide rod, a pressing plate, a spring, a driving seat plate, a positioning wheel, a driving part, a distance measuring detection plate and a distance measuring sensor. The driving wheel makes contact with the driven wheel through bounce of the spring, a workpiece is placed between the two wheels, the driving piece drives the whole mechanism to walk along the workpiece, and the positioning wheel moves along the top of the workpiece through the gravity of the mechanism. When the thickness of the workpiece changes, the movable hub seat slides along the guide rod, the distance measuring sensor sends measured distance data to the processor in real time, and welding parameters of the laser welding head are controlled. According to the utility model, the problems of weld penetration, arc breaking, non-uniform closed curve weld joints, unstable welding positions and the like can be solved under the complex working condition that the walking platform surface is uneven; and meanwhile, the method is suitable for laser stitch welding with variable thickness, and stitch welding under many complex working conditions can be met.

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

The utility model relates to the technical field of lithium ion battery manufacturing, in particular to a laser welding hold-down clamp and equipment, and the middle of the laser welding hold-down clamp is hollow to form a laser channel for laser to pass through. And an air blowing channel is arranged at the lower part of the pressing tool for laser welding. Nitrogen serving as shielding gas is blown into the welding point position through the gas blowing channel. A dust suction ring way is arranged in the upper portion of the pressing tool for laser welding, and at least one side of the upper portion of the pressing tool for laser welding is provided with a dust suction opening. And the dust extraction opening, the dust extraction loop and the laser channel are sequentially communicated to form a dust extraction channel. The dust suction opening can communicate with an air suction pump, and negative pressure is provided by the air suction pump, so that smoke dust sequentially passes through the laser channel, the dust suction annular channel and the dust suction opening and then flows out of the laser welding pressing tool. On the whole, a traditional dust extraction channel is improved, so that the dust extraction efficiency and the dust extraction effect are greatly improved, the amount of smoke detained near a welding point position is reduced, the weld penetration stability is high, and the pseudo soldering phenomenon is avoided.

The invention discloses a reliability-based titanium alloy medium plate welding optimization control system and method for a new energy vehicle, and the system comprises a data obtaining and preprocessing module, a performance prediction module, a reliability evaluation module and a process parameter optimization module, welding process parameters and the tensile strength of a welding joint, the welding width of the bottom surface of a welding seam and angular deformation under the corresponding welding process parameters are recorded; the performance prediction module is used for training and learning the sample data acquired in the data acquisition module, the trained performance prediction module is used for prediction, and the weight of an RBF neural network and the initial value of a Gaussian function parameter are optimized based on an improved genetic algorithm in the module; the reliability evaluation module is used for establishing a welding non-probabilistic reliability model based on an ellipsoid convex model and considering the tensile strength of a welding joint, the weld penetration depth and deformation, and evaluating the rationality of the current process parameter group by comparing the reliability obtained through calculation with a reliability threshold value; the process parameter optimization module is used for constructing a fitness function about the tensile strength of a welding joint, the weld width of the bottom surface of a welding seam and angular deformation by adopting a weight method, and optimizing an optimal process parameter group based on a particle swarm optimization algorithm of simulated annealing; according to the invention, efficient and reliable welding process optimization can be realized, the reliability and the performance stability of a welding joint are ensured, and the experiment trial and error cost is reduced.

The invention discloses a welding machining method for a drawer sliding rail, and belongs to the technical field of welding machining. S1, a middle rail workpiece is conveyed to a welding platform; s2, the clamp is controlled, so that the separation blade workpiece is attached to the welding position of the middle rail workpiece; s3, the compressed to-be-welded area is scanned through a visual sensor, and detection data of the gap and the surface state are obtained; s4, based on the detection data, the output power, the welding speed and the focus position parameters of a laser welding head are set; and S5, according to the set parameters, the laser welding head is controlled to weld the joint part of the separation blade workpiece and the middle rail workpiece, the visual sensor is used for detecting the assembly gap and the surface state in real time, and it is guaranteed that the weld penetration depth is consistent, and connection is firm; and secondly, a low heat input process is combined, so that the welding thermal deformation is greatly inhibited, the flatness of the separation blade and the middle rail is effectively maintained, and the welding precision, the structural strength and the sliding smoothness of the sliding rail are remarkably improved.

The invention discloses pipe fitting welding equipment and a using method thereof, and relates to the technical field of pipe fitting welding, the pipe fitting welding equipment comprises a bottom plate and a control module arranged on the upper side of the bottom plate, two sets of fixing mechanisms are arranged on the upper side of the bottom plate, a welding mechanism is arranged between the two sets of fixing mechanisms, and fixing and centering positioning of two sections of pipe fittings are achieved; the clamping assembly is driven by a first motor and rotates through an arc-shaped toothed plate, a stable foundation is provided for follow-up welding, the fixing mechanism comprises a transmission assembly, a lower fixing frame and an upper fixing frame, the lower fixing frame and the upper fixing frame are arranged on the transmission assembly, and the lower fixing frame and the upper fixing frame are both semi-arc-shaped plates. The pipe fitting is integrally rotated, the welding gun is fixed, it is effectively guaranteed that a molten pool is always located in the center area of the lower side of the pipe fitting, disturbance of gravity to molten metal is reduced, stability and forming quality of the molten pool in the welding process are improved, and the device has the advantages of being high in practicability and improving welding penetration depth and welding seam forming quality.

The invention discloses an OCT-based laser welding penetration error correction method and system, and the method comprises the steps: constructing an OCT penetration detection device to collect the keyhole depth information of a workpiece in the laser penetration welding process, and obtaining the keyhole depth information of the workpiece; performing filtering and moving average processing on the keyhole depth information of the workpiece based on a moving average algorithm of percentile filtering to obtain a keyhole depth change curve of the workpiece; and error correction is carried out on the keyhole depth change curve of the workpiece through a long and short term memory neural network model to obtain a corrected keyhole depth change curve of the workpiece. By means of the method and device, interference generated by OCT measurement can be reduced, noise signals are formed, the interpretability of OCT fusion depth detection data is improved, and therefore the precision of laser welding fusion depth online measurement of OCT is improved. The OCT-based laser welding penetration error correction method and the OCT-based laser welding penetration error correction system can be widely applied to the technical field of laser welding penetration detection.

The invention discloses a municipal pipeline welding supporting and positioning device and a welding method, and relates to the technical field of pipeline welding. The municipal pipeline welding supporting and positioning device comprises an advancing module and an expansion module. The expansion module comprises a central cross rod, a movable cross plate, a first electromagnetic supporting block and a second electromagnetic supporting block; an inner concave gap is formed between the first electromagnetic supporting block and the second electromagnetic supporting block; the first electromagnetic supporting block can move in the axial direction of the center transverse rod so as to drive the first annular end face and the second annular end face to get close to each other and be attached. The outer circumferential weld is located in the middle of the concave gap, that is, the first electromagnetic supporting block and the second electromagnetic supporting block are located on the two sides of the outer circumferential weld respectively, the problem that the outer circumferential weld adheres to the first electromagnetic supporting block / the second electromagnetic supporting block during weld penetration can be avoided, and then the expansion structure and the pipeline can be smoothly disengaged; and therefore, the expansion structure can smoothly contract and run to the next operation node.

The invention relates to the technical field of automatic and semi-automatic electric arc welding, in particular to a steel structure machining and welding method and device utilizing a submerged arc welding machine. Acquiring a coupling degradation index at the current moment according to the dispersion degree of the weld penetration sequence at the current moment and the energy distribution uniformity degree of each coupling interference sequence; dividing the coupling degradation indexes at all moments into a plurality of data windows; acquiring an average coupling degradation index at the current moment, and acquiring a dynamic threat level at the current moment by combining the dispersion degree and the change rate of the coupling degradation index in each data window; and then the initial proportionality coefficient in the PID control system is optimized, and the optimized proportionality coefficient is used for adjusting the current of the main welding wire at the next moment. By evaluating the dynamic interference degree at the current moment, the PID control system can make a response more accurately and timely according to the current interference degree.

The invention relates to a method for determining a welding penetration depth of a welding process, in particular a laser welding process, comprising the following method steps: a. carrying out a set-up process, wherein, in the set-up process, a predefined welding process is carried out and information relating to a vapour capillary (100) is determined, b. determining a measurement geometry (200, 202, 204) taking into account the information relating to the vapour capillary (100), c. carrying out a productive process, wherein the predefined welding process is carried out and a welding penetration depth is determined on the basis of measurements of the vapour capillary (100) which are carried out using the measurement geometry (200, 202, 204).

The double-arc double-wire submerged arc welding device comprises a portal frame connecting piece, an arc welding support is arranged on one side of the portal frame connecting piece, a through hole is formed in the top of the arc welding support, wire feeding devices are symmetrically arranged on the top of the arc welding support, motors are arranged on the two sides of the pair of wire feeding devices, and the motors are arranged on the two sides of the pair of wire feeding devices. A welding gun fixing rod is assembled at the bottom of the arc welding support, a pair of welding gun clamping pieces is arranged on the welding gun fixing rod, and a first welding gun and a second welding gun are arranged on the pair of welding gun clamping pieces respectively. According to the device, double-arc welding can be achieved, the height and the included angle of the welding gun can be flexibly adjusted, and the welding penetration depth is accurately controlled. According to the device, while the welding efficiency and the welding quality are guaranteed, the personal error in the welding process can be reduced, the control capability on the welding penetration depth is remarkably improved, the personnel safety is guaranteed, and the overall use performance of equipment is improved.

To obtain essential welding quality by preventing occurrences of welding defects, such as burn through and defective weld penetration, when performing the weaving weld of a lap fillet joint and a butt joint, different in plate thickness, in an AC consumable electrode arc welding method.SOLUTION: An AC consumable electrode arc welding control method in which an electrode polarity is periodically switched between an electrode positive polarity period and an electrode negative polarity period, each of which includes a plurality of cycles of a short-circuit period and an arc period, and a welding torch is welded while woven so as to cross a boundary line between a first workpiece and a second workpiece, comprises: when the first workpiece is thinner than the second workpiece, welding the first workpiece from time t4 to time t7, in the electrode negative polarity period in which a weld current Iw and a weld voltage Vw are negative values, and welding the second workpiece from time t1 to time t4, in the electrode-positive polarity period in which the weld current Iw and the weld voltage Vw are positive values.SELECTED DRAWING: Figure 2

According to the manufacturing method of the ship side segment, a longitudinal framework, a transverse frame and an inlaying plate are symmetrically welded from the middle to the two sides, welding thermal stress can be offset, overall deformation of the segment is effectively controlled, and the follow-up leveling difficulty is reduced. Local heat concentration is avoided by welding the binding bowls through the middle skip welding method, and deformation is further restrained. And the weld penetration depth is ensured through the design that the groove is formed in the inlaying plate welding area in advance, and the structural integrity of the connecting part is improved. The cross welding sequence of the longitudinal skeletons and the transverse frames enhances the overall rigidity of the sections. And the sub-decks are pre-leveled before the subsections are manufactured, so that a reference surface is provided for subsequent assembly, and accumulated errors are reduced. The sub-decks are integrally spliced after being manufactured in a modularized mode, and parallel operation can be achieved. And the final dimensional precision is ensured through secondary leveling after the deck sections are formed, and the assembly requirements of the broadside sections and other parts of the ship body are met.

The invention relates to a road metal guardrail welding machining device which comprises a rack and a mounting seat arranged on the rack in a lifting mode, the rack is provided with a lifting part for driving the mounting seat to ascend and descend, the mounting seat is rotationally provided with a fixing cylinder, a grating column is movably located in the fixing cylinder, and the two ends of the grating column protrude out of the fixing cylinder. The fixing cylinder is provided with a material returning opening for the grille columns to slide out in the radius direction of the fixing cylinder, the two cross beams are located on the two sides of the fixing cylinder correspondingly, and the rack is provided with a moving assembly for driving the two cross beams to slide synchronously, a positioning assembly for positioning and fixing the grille columns and a welding assembly for welding the grille columns. The two sets of positioning assemblies and the two sets of welding assemblies correspond to the two ends of the fixing cylinder. The method has the effects that the overturning step during welding of the cross beam and the grating column is reduced, the welding automation degree and the welding efficiency are improved, meanwhile, the consistency of the weld penetration depth and the weld width is kept, and the mechanical property of the weld is improved.

The invention discloses an infrared vision sensing detection method and an infrared vision sensing detection device for rocking arc bottoming weld penetration. The infrared vision sensing detection method comprises the following steps: intercepting left and right image small windows by using double windows, or intercepting a molten pool tail image small window by using a single window; taking edges between the highest point and the maximum curvature point in the left and right images as left and right feature edges, or searching first extreme points of longitudinal coordinates of the edges from left to right and from right to left in a part above half of the height of the edge image at the tail of the molten pool; searching an edge curvature maximum point from the left extreme point to the left and from the right extreme point to the right, and intercepting an edge between the extreme point and the corresponding edge curvature maximum point as a left part and a right part of a feature edge; fitting the feature edge by adopting a quadratic curve in the global image coordinate system to obtain a curvilinear equation and a quadratic term coefficient thereof, and taking the quadratic term coefficient as a feature parameter detection value; the fusion penetration state information is obtained by detecting the characteristics of the tail of the rocking arc backing weld molten pool, and high fusion penetration sensing detection precision is achieved.

The utility model discloses a welding work fixture for improving square lithium battery cover plate welding penetration, which comprises a base, a roll core positioning component and a cover plate positioning component are arranged on the base, the roll core positioning component comprises two roll core positioning grooves symmetrically arranged at the top of the base, and positioning clamping plates are arranged at the tops of the roll core positioning grooves. The positioning clamping plates are connected with lifting driving mechanisms; the cover plate positioning assembly comprises a cover plate positioning groove formed in the middle of the two roll core positioning grooves, the cover plate positioning groove is deeper than the roll core positioning grooves, inclined guide faces are arranged on the periphery of the cover plate positioning groove, two movable clamping plates are arranged above the guide faces on the two sides in a central symmetry mode, and the two movable clamping plates are connected with a synchronous transverse driving mechanism. The roll core positioning grooves are formed to limit the roll cores on the two sides, the positioning clamping plates are arranged at the tops of the roll core positioning grooves, and the positioning clamping plates are clamped at the tops of the roll cores, so that the situation that the roll cores jump up and down in the welding process, and consequently welding seams of connecting pieces and cover plates on the roll cores are uneven can be prevented.

The utility model discloses a projection welding device for a nut plate and a plate electrode, which belongs to the technical field of projection welding electrodes, and comprises a nut electrode holder and a nut electrode cover, and a conical compression spring and a KCF positioning pin are arranged in the nut electrode holder and the nut electrode cover. According to the utility model, through differentiated electrode structure design, one side of a thinner welding workpiece is contacted by a smaller electrode, and one side of a thicker welding workpiece is contacted by a larger electrode, so that current can be concentrated on the thin plate side as required, accurate deviation of nuggets is realized, the welding precision is improved, and the production efficiency is improved. Meanwhile, the depth of fusion and nugget at the projection welding spot of the workpiece are obviously increased due to the increase of the current density and the concentration of heat, and the welding strength and reliability are enhanced; the electrode material is changed on the basis of changing the electrode structure, and the beryllium copper electrode with larger resistance is adopted on one side of the thin plate, so that the welding heat on the side of the thin plate is increased.

This invention relates to the field of welding technology, specifically disclosing a welding device for a snow sweeper roller brush bracket, applied to the welding of the cover and side plates of the roller brush bracket; it includes: a frame; a welding unit; a cover tooling unit; and a side plate tooling unit. This invention achieves automatic fitting and end alignment of the inner folded edges of the cover and side plates through the coordinated action of a V-shaped placement table and side plate positioning components, eliminating positional deviations; a drive motor drives the rotating shaft to rotate at a uniform speed, guiding the welding torch to move uniformly along the joint, eliminating speed fluctuations and trajectory deviations, ensuring uniform weld depth and width; the side plate clamping component is rotatably connected to the rotating shaft, keeping the side plate vertical and ensuring that the fitting state is not damaged throughout the welding process.

The application relates to a laser welding device and a control method. The laser welding device is composed of a welding mechanism, a first gas source in communication with the welding mechanism, a tool with a material placing plane and a lower containing space, a gas blowing assembly with a first gas outlet opening towards a slit opening in the containing space and a second gas source in communication with the gas blowing assembly, and a controller electrically connected with the above units, wherein the welding mechanism comprises a welding gun and a gas blowing pipe located above a workpiece; the tool is provided with a slit opening extending along a joint seam between adjacent welding areas; and the controller determines and controls a second gas supply parameter according to welding parameters and a first gas supply parameter, so that an airflow from bottom to top lifts a molten pool through the slit opening, effectively solves the problems of metal infiltration, large back face excess height / sagging and oxidation caused by only upper gas supply, and further realizes the consistency improvement of back face forming and welding penetration and the adaptation to multi-station production.

The invention provides a precise welding dynamic control method and system.The method comprises the steps that when it is detected that a first welding body and a second welding body get close to a preset limit position and enter a welding state, the moving speed of the first welding body and the moving speed of the second welding body getting close to each other are detected in real time; and the welding power applied between the first welding body and the second welding body by a welding power source is adjusted based on the moving speed and the preset fusion depth. According to the method, the weld penetration is indirectly represented by detecting the approaching rate of the welding body, and then the welding power is dynamically adjusted, namely, a closed-loop control link of the progress rate of the weld penetration and the welding temperature is established, so that the hysteresis quality of direct temperature measurement is effectively avoided, real-time regulation and control are completed in the welding period, and the welding efficiency is improved. The matching error of the heat input and the target fusion depth is reduced, the welding quality consistency is improved, and the defect rate caused by dynamic process fluctuation is reduced.