184 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.

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 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 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.

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 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.

The utility model belongs to the technical field of geonet pad manufacturing, and particularly relates to one-time forming equipment for a three-dimensional geonet pad. The one-time forming equipment for the three-dimensional geonet pad comprises an extruder and a die head connected with the end part of the extruder, and is characterized in that an unwinding roller is arranged below the extruder, a slidable spinneret plate is connected below the die head, a plurality of uniformly arranged spinneret orifices are formed in the spinneret plate, a cooling water tank is arranged behind the unwinding roller, and a drawing roller is arranged behind the cooling water tank. The beneficial effects of the utility model are that one-step molding can be realized, the cost is effectively saved, and the material waste is avoided; by means of melt bonding, the problem of heating weld penetration caused in the prior art is avoided; and the flat screen does not need to be heated, so that the energy consumption is reduced.

The invention provides an intelligent welding system of a multifunctional self-dumping semitrailer, which relates to the technical field of laser welding and comprises a reciprocating driving mechanism, a movable welding mechanism, a fusion depth detection mechanism and an auxiliary observation mechanism, the mounting and positioning mechanism is mounted on the reciprocating driving mechanism, and the reciprocating driving mechanism is used for reciprocating the mounting and positioning mechanism; the movable welding mechanism is mounted on the mounting and positioning mechanism; the fusion depth detection mechanism is mounted on the rear side of the mounting and positioning mechanism; the auxiliary observation mechanism is mounted on the reciprocating driving mechanism and the mounting and positioning mechanism, and is used for assisting in observing the welding penetration depth; when an output shaft of a driving motor b drives a circular mounting shaft to rotate by 90 degrees, two rectangular detection plates move right below a laser welding head, so that the laser welding head can weld a gap between the two rectangular detection plates; the problems that a welding penetration automatic detection structure is lacked, and it is inconvenient for workers to detect the laser welding quality are solved.

A laser welding method for a stagnation shield and a turbine blade for improving a weld quality. The laser welding method includes laying a welding wire along a gap between the stagnation shield and the turbine blade; melting the welding wire using a laser having a laser incidence angle of 30° to 70°; and forming a weld having a weld penetration depth of less than 200 micrometers by one welding pass or two welding passes.

The embodiment of the invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode terminal, an electrode assembly and an adapter, wherein the electrode terminal is arranged on the shell; the electrode assembly is arranged in the shell. The electrode assembly is provided with a tab. And the tabs are electrically connected with the electrode terminals through adapters. The adapter comprises a first connecting part and a second connecting part, the first connecting part is electrically connected with the electrode terminal, and the second connecting part is electrically connected with the tab. Wherein the first connecting part comprises a first area and a second area, the second area is in welded connection with the electrode terminal, the reflectivity of the second area is smaller than that of the first area, and the reflectivity of the first area is 60%-100%. According to the battery monomer provided by the embodiment of the invention, the welding position of the adapter and the electrode terminal can be controlled, the problems of insufficient welding, weld penetration and other welding defects in the welding process are reduced, the welding stability between the adapter and the electrode terminal is improved, and the product quality is further improved.

The application discloses a titanium alloy heat source dynamic regulation and control welding and joint performance hybrid prediction method, relates to the technical field of welding, and comprises the following steps: aiming at the problem that the heat source of the titanium alloy medium plate welding is concentrated in the weld center and the side wall has a high unmelted rate, taking a heat source dispersion coefficient λ as a core regulation and control variable, constructing a physical-data hybrid driving model chain of the heat source form, the weld geometry, the microstructure and the tensile strength, defining the λ as the ratio of the side wall heat and the center heat, and realizing the active regulation of the λ in the safe range through a welding gun swing device; adopting a multivariate nonlinear regression and support vector machine regression hybrid mapping process parameter to the λ; adaptively fusing and predicting the weld penetration, the weld width and the remaining height by using MNR, BPNN and SVR; forcibly introducing physical intermediate variables such as the average width of α martensite and the proportion of low-angle grain boundaries to construct a tensile strength prediction model, and nonlinearly correcting the model by using the λ correction factor; solving a Pareto optimal process solution set; and establishing an online updating mechanism of the model chain causality consistency.

The invention relates to a method for determining the weld penetration depth in a laser welding process, comprising the steps of: moving a laser beam and a workpiece (10) relative to each other along a feed direction to form a weld seam, and aligning a measuring beam of an optical coherence tomograph to a measuring position (16) on the workpiece (10) to determine the weld penetration depth. In this method, the movement of the laser beam and the workpiece relative to each other is superimposed with a periodic movement of the laser beam along a path of motion that extends at least in a transverse direction (Y) perpendicular to the feed direction (X), and the measuring beam is aligned to a measuring position (16.Y) on the workpiece (10) that is constant in the transverse direction (Y) perpendicular to the feed direction (X).

The invention provides a special-shaped nut welding tool and a control method thereof, and relates to the technical field of mechanical tools.The special-shaped nut welding tool comprises a positioner workbench, the bottom of the positioner workbench is driven by a positioner to rotate, eight positioning tables are annularly distributed at the positions, close to the edge, of the positioner workbench, and vertical air cylinders are arranged at the bottoms of the positioning tables; the lower end of the air cylinder is vertically embedded in a mounting groove of the positioner workbench through a bolt; a pipe fitting is vertically clamped at the upper end of the positioning table; according to all welding process parameters set by the argon arc welding robot, a weld pool is stably formed on the lap joint face of the outer side of the special-shaped nut and the pipe fitting, weld joints are continuous and complete and free of defects such as air holes, inclusions and pits, the requirement for welding airtightness is met, and experimental performance detection such as weld joint penetration depth can be passed.