136 results about "Weld penetration" patented technology

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 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 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 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.

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 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 application discloses a pipe welding equipment and a use method thereof, and relates to the technical field of pipe welding. The pipe welding equipment comprises a bottom plate and a control module arranged on the upper side of the bottom plate. Two groups of fixing mechanisms are arranged on the upper side of the bottom plate, and a welding mechanism is arranged between the two groups of fixing mechanisms, so that the fixing and central positioning of two pipe sections are realized, and a stable foundation is provided for subsequent welding. The fixing mechanism comprises a transmission assembly, a lower fixing frame and an upper fixing frame on the transmission assembly, and the lower fixing frame and the upper fixing frame are both semicircular arc plates. The clamping assembly driven by the first motor and rotating through the arc-shaped tooth plate is arranged, so that the pipe is rotated as a whole while the welding gun is fixed. The molten pool is always located in the central area of the lower side of the pipe, the disturbance of gravity to the molten metal is reduced, the stability of the molten pool in the welding process and the forming quality are improved, and the pipe welding equipment has the characteristics of high practicability, welding penetration improvement and welding seam forming quality improvement.

This invention belongs to the field of welding technology, and particularly relates to a laser-TIG hybrid welding device and method that can increase weld width. Its features include a laser welding torch and a TIG welding torch. The TIG welding torch incorporates an ultrasonic micro-vibration component. The laser welding torch is connected to a laser generator, and the tail of the TIG welding torch is connected to a welding power source. The TIG welding torch contains a combined electrode, which includes a copper rod at the top and a tungsten electrode connected to the lower end of the copper rod. The ultrasonic micro-vibration component includes a transducer and an amplitude transformer connected to the transducer. The copper rod is located within the central hole of the transducer and the amplitude transformer. The tungsten electrode is connected to the amplitude transformer via an eccentric ceramic ring. A tungsten electrode sleeve is connected to the bottom of the amplitude transformer, and a nozzle is located on the outer side of the tungsten electrode sleeve. The bottom of the tungsten electrode sleeve is a concave mirror surface. The beneficial effects of this invention are: it is suitable for welding nickel-based alloys, significantly increases weld penetration, improves weld formation quality, enhances the welding capability of thick plates, and solves the welding problem of nickel-based alloy thick plates larger than 10mm.

The application discloses a cold plate production method with an intermediate layer, comprising single-piece punch forming of an upper plate and a lower plate, and inlet and outlet water port processing; the upper and lower plate materials are selected from 5 series aluminum alloys with good strength and welding performance, such as 5754, 5083, 5182 and the like; a tool is used to fix the intermediate layer on a flat plate; point gluing fixation or lashing or spraying can be used to combine the intermediate layer with the flat plate; the intermediate layer is made of 4 series aluminum alloys, such as 4045 and 4047, and the thickness is between 0.1 mm and 0.2 mm; the lower plate is assembled above the intermediate layer; laser welding is performed along the track of the intermediate layer; due to the high penetration of laser energy, the thickness of the lower plate is less than or equal to the thickness of the upper plate; in order to ensure the flatness and welding strength of the upper plate after welding, the laser welding penetration depth is greater than or equal to 0.25 mm, and the welding width is greater than or equal to 1.2 mm; the application has the advantages of simple process, reduced production cost, reduced flatness requirement between the flat plate and the stamping plate after adding the intermediate layer, reduced processing difficulty and improved product yield.

The invention discloses a method for ultrafast laser welding of a ceramic reinforced aluminum-based composite material in a vacuum environment, and aims to solve the problems that high-precision welding and micro-area welding are difficult to realize by a traditional connection method of the existing ceramic reinforced aluminum-based composite material, the strength of a joint is limited by an ultrafast laser welding method, the thickness of a weldable workpiece is limited and the like. The ultrafast laser welding method in the vacuum environment comprises the steps that firstly, a to-be-connected face is ground and polished; secondly, the to-be-welded parts are assembled in a butt joint mode and placed in a vacuum cabin; 3, vacuumizing the vacuum chamber; and fourthly, ultrafast laser is aligned with the weld joint, the laser pulse width is controlled to be 200 fs to 10 ps, the laser power is 10 W to 120 W, the welding speed is 0.03 mm / s to 5 mm / s, and ultrafast laser welding is conducted. The obtained connector is almost free of welding deformation, the bending strength reaches 80% of that of base metal, high-precision welding and micro-area welding are achieved, meanwhile, the welding penetration depth can be effectively increased through the vacuum environment, and the thickness size range of weldable workpieces is enlarged.

The utility model provides a battery pack box and battery pack, the battery pack box comprises a plate body and a beam body, the beam body comprises a connecting part and a middle part, the connecting part is connected with the plate body, the middle part is connected with one side of the connecting part deviating from the plate body, in the extension direction of the plate body, at least one side of the connecting part is provided with a protruding part protruding out of the middle part, and the plate body is provided with a groove. The protruding part is welded to the plate body to form a welding seam, and the welding seam is connected to the side, away from the plate body, of the protruding part. By arranging the protruding part on the beam body, when the beam body and the plate body are welded, welding mainly occurs between the protruding part and the plate body, the protruding part is relatively thin and small in heat capacity, and the protruding part is prone to temperature rise and reaches the melting temperature, so that a welding seam is formed, and it is ensured that when the beam body reaches the needed fusion depth, the temperature rise of the plate body is still kept within the allowable range; and the risks of overheating and weld penetration are avoided. Therefore, the demand balance between the beam body welding penetration depth and the plate body welding penetration prevention can be realized, the plate body welding penetration risk is reduced, and the welding quality is improved.

The present application relates to the technical field of welding, in particular to a split type cement bin body welding device, which comprises an arm welding machine, a support plate is fixedly connected to the outer side of the arm welding machine, a bearing column is fixedly connected to the support plate, a starting assembly for welding the split type cement bin body is arranged on the bearing column, a movable column and a movable plate are arranged in the starting assembly, and the movable column and the movable plate can provide power for cleaning rust when the split type cement bin body is welded, the starting assembly, the main removing assembly and the slag removing assembly are matched, so that the grading polishing of the rust at the welding position, the high-frequency vibration and falling of the residual rust slag in the gap and the dust-free wiping of the water and oil stains can be simultaneously completed before welding, the arm welding machine is started immediately after rust cleaning to continuously weld, the core problems of poor fluidity of liquid metal, insufficient weld penetration and poor fusion caused by the rust on the carbon steel tile of the split type cement bin are avoided, and the stability of welding is improved.

The invention belongs to the technical field of laser welding automation, and discloses a high-precision laser welding device for a massage chair iron stand. The device comprises a laser welding execution unit, a vision measurement unit, a self-adaptive robust control unit and a man-machine interaction unit, aiming at the problems that the traditional welding quality is unstable and the anti-interference capability is poor, the core of the device is that the self-adaptive robust control unit carries out high-precision prediction through a welding process dynamic model module, and the self-adaptive robust control unit carries out real-time real-time monitoring. The robust tracking control module generates an anti-interference cooperative control instruction in real time and drives the execution unit to complete welding, precise closed-loop adjustment of the laser power, the welding speed and the track of the robot is achieved, the fluctuation range of the weld penetration depth and the weld width is reduced, the stability and consistency of the welding quality are remarkably improved, and the welding quality is improved. And the method has strong robustness for interference such as clamping errors and thermal deformation, and integrates an online quality evaluation early warning function based on deep learning.

The invention discloses automatic plasma splicing welding equipment and process for a stainless steel elevator door plank, and the equipment comprises a rack which is internally provided with a plurality of supporting rollers; the transfer mechanical arm is arranged outside the rack; the portal frame is erected on one side of the rack, two sets of sliding rails are fixed to the portal frame in a bilateral symmetry mode, and sliding blocks are installed on the sliding rails in a sliding mode; the machine plate is arranged on one side of the portal frame in parallel, and the machine plate is fixed to the sliding blocks; the rolling device is vertically fixed in the middle of the machine plate; the two welding units are symmetrically arranged; the two symmetrically-distributed welding units are adopted for synchronous welding, and the welding efficiency is improved; the rolling device can be pressed on one side of the upper end face of the door plate support, the welding seam scanning device can conduct image scanning on a welding seam on the side, not pressed tightly, of the door plate support, and therefore the welding seam form is obtained, the defects of incomplete fusion, undercut or weld penetration and the like possibly occurring in traditional welding are overcome, and the welding quality under the complex working condition is guaranteed.

The invention discloses an electron beam welding method for repairing a hole defect on the surface of a finish machining part and the part, and belongs to the technical field of electron beam welding.The method comprises the steps that a drill bit with the diameter capable of enveloping the size of the hole defect in the part to be repaired is selected, and a drill hole is machined in the position of the hole defect; controlling the diameter and depth of the drilled hole; a filling body with the diameter equal to that of the drill hole and the length larger than the depth of the drill hole is machined or cut out, and the filling body is stuffed into the drill hole; corresponding electron beam welding parameters are selected, so that the welding penetration depth reaches the drilling depth; a circular scanning beam is adopted, electron beam welding is conducted on the filling body, the beam value during welding is gradually increased to the preset maximum value from the zero value and then gradually decreased to the zero value, and an electron beam welding seam is formed; and processing to remove excess weld metal on the surface of the part and weld beading on the back surface. In the repair welding process, the heat input amount is small, the welding time is short, the deformation problem of parts caused by repair welding can be effectively reduced, it is guaranteed that the parts are delivered in a qualified mode, and good applicability is achieved.

The invention provides a thin-wall stainless steel skin heat insulation tile connecting structure welding method which comprises the following steps: marking a welding area and a welding sequence by marking a connecting piece distribution position of a to-be-welded area of a skin; according to the marked welding area and the welding sequence, the to-be-welded part is welded to the target position through a short-period and balanced magnetic field stud welding method; and after welding is completed, welding spot detection and air tightness detection are conducted on the skin welding seam area. High-quality and high-efficiency welding connection of rocket thin-wall stainless steel skin heat insulation tile metal structures repeatedly used in China can be achieved, the equipment investment cost is low, the welding technical problems of guaranteeing the welding strength of thin-wall stainless steel skin heat insulation tile structural parts and precisely controlling weld penetration are solved, and the technical blank of product development is filled.

The invention provides an automatic welding system and method for seal welding, and relates to the welding technology, which comprises the following steps of: before welding, controlling a motion control device to move a welding device and a welding tracking control device to a starting point of a welding position according to collected welding information; in the welding process, the motion control device is controlled to move the welding device along the to-be-welded position, and the welding tracking control device is controlled to collect welding information in real time; and the moving speed of the motion control device and the welding parameters of the welding device are adjusted according to the collected welding information so as to complete automatic welding. The method has the beneficial effects that the problems of low efficiency, large amount of heat generated by continuous high-temperature operation, electric arc radiation and toxic smoke dust of a traditional manual process are solved; segmented continuous welding is achieved, power at the lap joint corners is gradually changed, weld penetration of weld joints at the corners due to the power problem is avoided, and the technical effect of self-adaption of the welding process at different welding positions is achieved.

The invention provides a welding method for a guide pipe and a U-shaped clamping block. The welding method comprises the steps that the U-shaped clamping block with an arc through groove is machined and assembled with the guide pipe, an assembly body is installed on a special back protection tool, ventilation is conducted on the back protection tool before welding, after argon arc welding is adopted for evenly distributing spot welding, welding is completed through a segmented welding method, and the back protection tool is disassembled after welding. The back protection tool is provided with an air inlet pipe, an air outlet pipe, a left protective gas cavity, a right protective gas cavity and a U-shaped section structure, and protective gas enters the left cavity through the air inlet pipe, reaches the right cavity along an arc through groove and then is exhausted. The method solves the core problem that in the prior art, when the U-shaped clamping block and the guide pipe are welded, weld joint back protection is difficult to achieve, the weld joint forming effect is improved, the penetration detection defect occurrence rate is effectively reduced, and the requirements of weld joint penetration detection and go gauge detection are met.