771 results about "Arc welding" patented technology

The invention provides a swing control method based on molten pool oscillation multi-feature fusion and related equipment, and relates to the technical field of welding, the method comprises the steps that in the argon arc welding process, an electric arc signal and a molten pool oscillation signal of a variable wall thickness welding area are collected in real time; oscillation amplitude, main frequency characteristics, current fluctuation coefficients and voltage-current phase difference characteristics are extracted from the molten pool oscillation signals and the electric arc signals and combined, and an oscillation comprehensive characteristic matrix is obtained; inputting the oscillation comprehensive characteristic matrix into a pre-trained classification model, and identifying a current molten pool state type; a corresponding swing compensation strategy is matched according to the state type of the molten pool, and asymmetric swing parameters are generated; and the asymmetric swing parameters and a preset basic welding track are subjected to superposition operation, and a composite control instruction is generated to control a welding gun to execute asymmetric swing welding. By implementing the method, different abnormal states of different molten pools can be subjected to differential control, and the stability of the variable-wall-thickness welding process and the forming quality of a final weld joint are improved.

The invention relates to the technical field of pipeline splicing and welding, and discloses a rapid splicing and welding device for a large pipeline in a narrow space, which comprises a base, a butt joint assembly is arranged on the upper part of the base, a lower hoop plate is arranged on the outer surface of the butt joint assembly, and an upper hoop plate is arranged on the upper part of the lower hoop plate; an automatic electric arc welding mechanism is arranged in the driving assembly, the butt joint assembly comprises a support fixedly connected to the upper surface of the base, a lead screw is slidably inserted into the middle of the support in a penetrating mode, and the end of the lead screw is fixedly connected with the side edge of the lower hoop plate. The pipeline is locked through splicing of the upper hoop plate and the lower hoop plate, bidirectional extrusion force is generated through cooperation of the inclined butt joint groove and the butt joint block, the pipeline is synchronously held by the upper hoop plate and the lower hoop plate, after the ends of the hoop plates are aligned, the pipeline is accurately arranged in the circular hoop in a sleeved mode, misalignment caused by gravity sagging is effectively eliminated, concentric alignment of the welding ends is rapidly completed, and the welding efficiency is improved. And the assembly precision and efficiency are improved.

The invention belongs to the field of argon arc welding devices, and particularly relates to an automatic device for circular tube butt-joint argon arc welding, which comprises a base, and a circular tube butt-joint positioning assembly is arranged on the base; the round pipe butt joint positioning assembly comprises a rotating plate rotationally arranged on one side of the upper end face of the base, two transverse moving columns are distributed on the upper end face of the rotating plate in a 90-degree array mode with the rotating shaft as the axis, the transverse moving columns are slidably connected to the rotating plate, and a connecting plate is fixedly connected to the upper end of the rotating plate. According to the round pipe butt joint device, automatic butt joint of round pipes is achieved through the round pipe butt joint positioning assembly, the round pipe feeding assembly, the orientation angle recognition assembly and the material moving assembly, the process that operators conduct manual butt joint on the round pipes is omitted, and the labor intensity is reduced. The orientation and the angle of the circular pipes are judged in a distance sensing mode, the two circular pipes are accurately adjusted to be at the proper angle, then it is guaranteed that the inclined faces of the two circular pipes are accurately attached, weld joint deviation is avoided, and therefore it is guaranteed that welding work is conducted smoothly.

The invention discloses a method for performing visual inspection on surface forming quality characteristics of a welding seam by utilizing three-dimensional reconstruction, which comprises the following steps of: S1, performing uniform-speed scanning on the welding seam along the direction of a welding bead by using linear structured light emitted by a linear laser, and performing image acquisition on linear structured light stripes formed on the surface of the welding seam by using an industrial camera; s2, converting the acquired RGB image into a gray level image frame by frame, and carrying out image distortion correction and image denoising processing; s3, carrying out ROI (Region of Interest) positioning on the formed line structured light stripe image on the surface of the welding seam by adopting a pixel point gray level distribution calculation method; s4, carrying out image segmentation on the ROI region of the weld line structured light stripe image; and S5, carrying out sub-pixel-level center line extraction on the ROI of the weld line structured light stripe image by adopting a gray extreme value weighted centroid method. Automatic detection of welding seam forming quality characteristics such as laser welding and electric arc welding can be achieved, and the operation efficiency of a production line and the welding seam quality detection precision can be greatly improved.

The invention provides an automatic wire feeding device of a gas shielded welding machine, which belongs to the technical field of electric arc welding equipment and comprises a wire feeding motor, a wire feeding wheel and a wire pressing wheel. Wherein a rotating frame is installed on the side, close to the wire incoming direction, of the output end of the wire feeding motor, a movable straightening wheel and two fixed straightening wheels are installed on the two sides of the center of the interior of the rotating frame respectively, the movable straightening wheel is located between the two fixed straightening wheels, and the rotating frame is arranged to be capable of rotating around the center of the wire guiding pipe. By arranging the rotating frame, the movable straightening wheel and the fixed straightening wheel, a drawn welding wire penetrates through the space between the movable straightening wheel and the fixed straightening wheel in the rotating frame before entering the wire feeding wheel, and the movable straightening wheel and the fixed straightening wheel exert pressure on the circumference of the welding wire along with rotation of the rotating frame; the bending of the welding wire in any direction of the whole circular section can be straightened, and unsmooth wire feeding caused by the fact that the tilting distance of the welding wire is too large is avoided.

To obtain excellent welding quality by suppressing an increase in generation amount of spatters even when a short circuit occurs between a welding wire and a base material in consumable electrode pulse arc welding.SOLUTION: A feed speed Fw of a weld wire is set to a forward feed peak during a peak period from a time t2 to a time t3, and is set to a reverse feed peak during a base period from the time t4 to the time t52, and a start of the peak period at the time t41 is delayed until a short circuit between the weld wire and a base metal generated during the base period at the time t52 is released.SELECTED DRAWING: Figure 3

The invention discloses electric arc welding equipment and method for pin shaft machining, and relates to the technical field of pin shaft machining. The electric arc welding equipment and method for pin shaft machining comprise a welding bin, an electric arc welding device, a welding device and an electric arc welding device, and a placing base is assembled in the welding bin; the rotating part is assembled in the welding bin and is driven by a servo motor, and a movable welding head is assembled at the bottom of the rotating part; a first hydraulic bin connected with the oil pump is assembled in the welding bin. According to the electric arc welding equipment and method for pin shaft machining, a welding bin is opened, a to-be-welded pin shaft is placed in a placing base, an oil pump is driven, oil is introduced into a first hydraulic bin, a partition plate, a first spring, a first transmission rod, a second transmission rod, a sliding plate, a first elastic telescopic rod, a pressing plate, a rotating rod, a hinge rod and a gravity column are matched, and then a shaft base can be stably supported; and the other side of the shaft seat is prevented from tilting during welding, so that the welding effect of the device is improved.

The utility model relates to the technical field of welding machines, and discloses a gas shielded welding machine for corner bracket production, which comprises a movable seat, a welding machine main body is arranged at the top of the movable seat, and an adjustable push handle positioned on the left side of the welding machine main body is arranged at the top of the movable seat. A welding gun pipeline assembly located on the right side of the welding machine body and connected with the welding machine body is arranged at the top of the movable base. According to the gas shielded welding machine for corner bracket production, by arranging a welding gun pipeline assembly and a protection assembly, firstly, a threaded rod is rotated to drive a protection frame to move upwards, so that a winding roller is opened, a worker can wind a pipeline outside the winding roller at the moment, and the welding gun pipeline is clamped in a U-shaped clamping seat at the moment; and at the moment, a fastening bolt is screwed off to fasten and limit the welding gun pipeline, then the purpose of winding and unwinding the pipeline can be achieved, then a threaded rod is rotated to drive a protection frame to move downwards to protect the pipeline, the practicability of the device is improved, and the device is convenient to use by workers.

A method for controlling pulse arc welding involving feeding a welding wire and applying a welding current by repeating a pulse cycle including: a peak rising period of applying a peak rising current increasing from a base current to a peak current; a peak period of applying the peak current; a peak falling period of applying a peak falling current decreasing from the peak current to the base current; and a base period of applying the base current. The feed speed of the welding wire is changed such that it beings to change from a reverse-feeding peak value toward a forward-feeding peak value at a point earlier by a first preceding period than the start of the peak rising period. Then, the feed speed reaches the forward-feeding peak value at a point earlier than an end of the peak rising period, and beings to change from the forward-feeding peak value toward the reverse-feeding peak value at a point earlier by a second preceding period than the start of the peak falling period, and reaches the reverse-feeding peak value at a point earlier than an end of the peak falling period.

The invention relates to the technical field of surfacing, in particular to a high-toughness wear-resistant martensitic stainless steel flux-cored wire and a surfacing method thereof. According to the welding wire, a tubular structure containing Cr-Mo-Ni-V (-Nb) alloy powder wrapped by a low-carbon 13Cr steel belt is adopted, low-heat-input multi-layer submerged-arc welding and 550-560 DEG C postweld heat treatment are matched, a surfacing layer obtains a tempered martensite matrix and a dispersed carbide structure, the hardness reaches 52-56 HRC, the dilution rate is smaller than or equal to 15%, high abrasion resistance, corrosion resistance and hot crack resistance are achieved, and the room-temperature impact energy is 25-28 J.

The invention discloses a welding power supply extension module integrating arc voltage tracking and welding machine control functions and a welding control method, and belongs to the technical field of electric arc welding. In order to solve the problems that arc voltage tracking and welding machine control are mutually independent and cannot cooperate in real time in the existing TIG welding process, so that the welding process is tedious in operation and unstable in quality, the system comprises a core processor for executing an arc voltage tracking control algorithm and a welding parameter adjusting algorithm; the signal conditioning circuit is used for collecting and conditioning a current signal and a voltage signal output by the welding power supply; the welding power supply control module is provided with a plurality of interface circuits used for being connected with welding power supplies of different interface types; the core processor receives state information of the welding process through the high-speed communication module and generates a first control instruction used for adjusting output parameters of a welding power source and a second control instruction used for adjusting the height of a welding gun according to the state information and current signals and voltage signals collected by the signal conditioning circuit. The method is used for electric arc welding.

The invention discloses a multi-angle welding tool for welding a cylindrical shell of a petroleum separator, relates to the technical field of petroleum machining equipment, and provides the following scheme that the multi-angle welding tool comprises a welding gun body, and further comprises supporting mechanisms arranged at the two ends of the whole tool and used for carrying out balanced supporting on the two ends of the welding position in the cylindrical shell of the petroleum separator to be welded; the transverse welding mechanism is arranged between the two supporting mechanisms and used for driving the welding gun body to move transversely. Longitudinal and circumferential welding seam welding can be independently completed, arc welding seam welding can also be cooperatively achieved, the distance between the welding gun body and a welding point can be accurately adjusted, shells with different diameters and lengths can be adapted, the whole set of tool does not need to be replaced, pressure feedback of an extrusion sensing block is matched, the inner wall of the shell can be clamped in a self-adaptive mode, and it is guaranteed that a welding area is horizontal and free of displacement; dislocation weld defects are reduced, movement errors of the welding gun body are controlled, weld forming uniformity is guaranteed, and the problems of undercut and incomplete fusion are avoided.

The invention relates to the field of welding automation, and discloses an aluminum profile multi-process automatic welding method and system. The method includes: acquiring workpiece structure parameters to generate a weld recognition track and an initial welding track; scanning to obtain a weld space curve and calculating left-right deviation and height deviation; segmenting the welding seam based on the curve and the deviation, and judging full welding, intermittent welding, swing welding, spot welding and intersecting line welding to generate a welding process sequence; correcting the initial welding track according to the deviation, determining a welding parameter set by a welding data expert database, and issuing the welding parameter set to a digital arc welding power supply; and in the welding process, closed-loop correction and linkage compensation of welding parameters are carried out, and scanning data, correction, a process sequence, a parameter set and abnormal information are recorded. The system comprises a clamping and positioning module, a welding execution module, a welding power supply module, a welding seam scanning and tracking module and a welding control module.

The invention belongs to the technical field of welding, and particularly discloses a solid welding wire fusion repair welding method which comprises the steps that a to-be-fusion repair area is cleaned; the extending length of a tungsten needle on the argon tungsten-arc welding gun is adjusted not to exceed the inner diameter of a nozzle of the argon tungsten-arc welding gun; the height from the tungsten needle to the to-be-repaired area is adjusted to be a preset height, so that the electric arc does not deviate; the fusion repair included angle is adjusted to be within a first preset angle on the two sides of the weld toe included angle bisector; welding toes and plates around the welding toes are molten again through an electric arc, molten metal on the two sides of the welding toes is drained to the middle area through the surface tension of a molten pool after melting, and the surface of the solid welding wire welding seam is made to be smooth. By means of the method, a smooth transition area can be formed on the surface of the weld toe, the effect of stress concentration of the weld toe can be remarkably reduced, the weld bead shape can be finished by replacing a grinding machine with the method of weld toe fusion repair between layers, the incomplete fusion condition is reduced, and therefore the internal quality of the weld is improved.

The invention relates to the technical field of fireproof cables, in particular to a flexible fireproof cable with staggered cooling runners, which comprises a fireproof cable body, and the fireproof cable body comprises a stranded copper conductor, a conductor insulator, a cabling, an argon arc welding corrugated copper sleeve and a halogen-free flame-retardant polyolefin outer sheath from inside to outside. And the outer side of the fireproof cable body is sleeved with an externally-hung monitoring flow guide device at the joint positions at the two ends. According to the flexible fireproof cable with the staggered cooling flow channel, conductor insulation is formed by a polyester belt, a double-sided synthetic mica belt and a conductor single-sided synthetic mica belt, and a cabling is formed by a halogen-free flame-retardant filling rope, a cabling single-sided synthetic mica belt and a halogen-free flame-retardant belt to form a flame-retardant material; the flame-retardant effect of the whole cable can be greatly enhanced, and secondary pollution is avoided; and an argon arc welding corrugated copper sleeve is arranged between the cabling and the halogen-free flame-retardant polyolefin outer sheath, so that the fireproof cable body has certain flexibility, and a serial cavity can be formed in the fireproof cable body.

The invention relates to the technical field of welding devices, in particular to a metal guardrail electric arc welding device which comprises a workbench, a mounting support is fixedly connected to the upper end of the workbench, a fixing mechanism used for calibrating the position of a transverse rod is arranged on the inner side of the mounting support, and two symmetrical supporting frames are fixedly connected to the upper end of the mounting support. Two sets of welding mechanisms used for welding guardrails are installed on the inner side of the supporting frame, a transverse pipe is preliminarily clamped and fixed through a first electric clamp at the upper end, the transverse pipe is prevented from moving in the adjusting process, and an arc-shaped rack of a positioning assembly can be unfolded to form a complete annular track surrounding a welding seam; and the first sliding blocks limit the racks to move only along the arc-shaped tracks, and it is ensured that the tracks are completely attached to the weld joints.

This invention relates to an automated splicing arc welding production device. It employs a seven-axis transport robot positioned below an automated intelligent transport truss along a preset axis. Below the automated intelligent transport truss, and on one side of the seven-axis transport robot, several positioning trolleys are positioned along the preset axis. Below the automated intelligent transport truss, and on one side of the positioning trolleys' travel path, an assembly fixture is positioned. A welding robot is positioned on one side of the assembly fixture. The main control system controls the positioning trolleys to transport materials to the assembly fixture, where the seven-axis transport robot assembles the materials. The welding robot welds the assembled materials. The automated intelligent transport truss removes the welded materials from the production line. This device solves the technical problems of on-site chaos, frequent errors, low production efficiency, and high manual labor intensity.

The invention discloses a welding method for a through connecting pipe of a high-strength steel outer shell and a low-strength steel inner shell of a jacketed pressure vessel. The welding method comprises the core steps that pre-welding precision pretreatment is conducted, specifically, size and defect detection, homogenization finishing and preheating are conducted on a machined groove; sequence optimization welding is conducted, specifically, the sequence of combining'inside and outside 'and'segmented skip welding' is adopted, and bottoming surfacing welding is conducted on the connecting pipe side (the high-strength steel side) preferentially; strict control in welding: adopting a combined process of argon tungsten-arc welding bottoming and shielded metal arc welding filling, and accurately controlling interlayer temperature, heat input and weld bead size; and timely and effective post-welding treatment is conducted, specifically, after welding is completed, high-temperature post-heat treatment is conducted immediately, or overall intermediate annealing is selected according to the structural constraint degree. Through systematic process combination, welding stress is effectively decomposed and released, generation of cracks is restrained, and the welding quality and reliability of the jacketed container penetrating connecting pipe connector are remarkably improved.

This utility model relates to the field of welding technology, specifically an electron beam welding fixture for clamping a workpiece. The workpiece consists of a flat portion and a bridge-shaped portion, with the two flat portions respectively located on both sides of the bridge-shaped portion. A groove is provided on the back of the bridge-shaped portion, and a ring of welds consisting of a straight weld and a circular arc weld on opposite sides is provided on the bridge-shaped portion. The fixture includes an "L"-shaped plate composed of a horizontal plate and a vertical plate. The horizontal plate consists of a fixture flat portion and a fixture bridge-shaped portion that respectively mate with the flat portion and the bridge-shaped portion of the workpiece. A protrusion on the fixture bridge-shaped portion mates with the groove on the back of the bridge-shaped portion. A workpiece positioning structure and a workpiece fastening structure are provided between the flat portion of the workpiece and the fixture flat portion. This electron beam welding fixture can reduce welding deformation of special structure workpieces, ensure post-weld dimensional accuracy, ensure the welding quality of arcs and junctions, and meet special welding requirements.

This invention discloses a brake release device for an arc welding robot, relating to the field of robot technology. The brake release device includes: a collision sensor, which outputs a low level when the welding torch of the arc welding robot collides with another object, and outputs a high level when no collision occurs; and a main control chip, whose input is connected to initial, intermediate, and end manual switches, the output of the collision sensor, and a switching switch. The main control chip outputs a shaft brake release switch. When the welding torch of the arc welding robot collides with another object, the main control chip controls the relevant brake to release the brake through signal acquisition and calculation from the collision sensor. When a collision fault occurs during the automatic operation of the arc welding robot, the end brake is automatically released, allowing the robot to be removed from the interference zone for maintenance at any time, while ensuring that the servo origin is not lost during the rotation of each axis.

The utility model relates to the field of arc welding room ventilation, and discloses an arc welding room ventilation assembly which comprises a welding room used for supporting, a protruding plate of the welding room is fixedly connected with a ventilation air pump, the output end of the ventilation air pump is fixedly connected with an air inlet pipe, and the inner side of the air inlet pipe is fixedly connected to the left side of the welding room. An exhaust pipe is fixedly connected to the left side of the top end of the welding room, an exhaust pump is fixedly connected to the outside of the exhaust pipe, a cooling box is fixedly connected to the position, located on the right side of the exhaust pipe, of the top end of the welding room, a cooling screw pipe is fixedly connected to the right side of the exhaust pipe, and a discharging pipe is fixedly connected to the bottom end of the cooling screw pipe. A water flow cooling assembly is installed in the cooling box and used for achieving cooling of high-temperature gas. According to the utility model, the high-temperature waste gas treatment effect of the device is improved, the pipeline is prevented from cracking due to high temperature, the stability of the device in the exhaust process is improved, and waste particles are conveniently treated.

The utility model relates to the technical field of steel structure welding, in particular to a steel structure electric arc welding device which comprises a base, and the upper end face of the base is fixedly connected with a supporting frame. The position adjusting assembly comprises a linear sliding rail fixedly connected to the upper end of the supporting frame, an electric sliding seat is slidably installed on the linear sliding rail, a switching frame body is fixedly connected to the lower end face of the electric sliding seat, a ball screw is rotatably connected to the inner side of the switching frame body, a sliding block is in threaded connection to the ball screw, and a sliding block is fixedly connected to the sliding block. The outer wall of the sliding block is fixedly connected with a bearing plate. The welding position of the electric arc welding gun on the steel structure can be conveniently adjusted, the electric arc welding operation efficiency of the steel structure can be improved, the steel structure can be adaptively limited and fixed, the stability of the steel structure in the electric arc welding operation process can be kept, and the welding strength of the steel structure is guaranteed.

The invention relates to a nozzle machining process based on friction welding and argon arc welding. The nozzle machining process comprises the following steps that S1, a blank is machined; s2, assembling is carried out; s3, welding is conducted; and S4, the nozzle part is machined. On one hand, the split type design is adopted, the multiple connecting parts are correspondingly attached to the side edge of the cover plate in the circumferential direction, the nozzle body supports the inner wall of the cover plate, a supporting foundation is provided for friction welding, meanwhile, the nozzle part and other characteristics are machined step by step, accurate assembly and welding are ensured, and welding deformation is effectively reduced; and on the other hand, based on cooperation of friction welding and argon arc welding, comprehensive welding is achieved, the welding missing probability is reduced, the machining cost is low, the yield is high, and the requirements of single-piece and batch production are met.

The application discloses a lamp processing horizontal automatic circular arc welding machine and relates to the technical field of arc welding machines.The application comprises a mounting frame, a welding head is mounted on the mounting frame, and a driving motor is mounted on the mounting frame; a fixing member is mounted on the mounting frame, and the fixing member comprises a containing cavity and a fixing portion, and the containing cavity is used for containing a base body.When welding is performed, the base body is first fixedly mounted in the containing cavity through the fixing portion, the cylindrical component is clamped and fixed through the clamping portion, the clamping member is slid to make the clamping member approach the base body with the cylindrical component and contact the base body, in the process of sliding of the clamping member, the positioning plate is inserted into the positioning hole, the inner wall of the positioning hole is shielded and limited through the positioning plate, when the cylindrical component contacts the base body, the axis of the cylindrical component is collinear with the axis of the base body, the two are positioned, the welding accuracy is increased, and the practicability of the device is increased.

The invention discloses a CMT electric arc welding method for defect repair welding of a ZL114A aluminum alloy casting, and belongs to the technical field of defect repair of aluminum alloy castings. The method aims at solving the problems that an existing repair welding method for the ZL114A cast aluminum alloy is high in heat input, large in deformation and low in repair efficiency. The method comprises the following steps: firstly, aiming at defects of different sizes, machining the defects into regular spherical-crown-shaped grooves of different sizes by utilizing a cold machining method; an electric steel wire brush is used for polishing the inner wall of the groove and base metal around the groove, and surface stains and oxide skin are removed; the casting is placed on a welding workbench; robot CMT welding equipment is adopted for repair welding; and writing a welding gun repairing path on the robot demonstrator. And repair welding is carried out according to the following principles: repair welding is carried out by utilizing an Al-Si welding characteristic curve, a repair welding piece is preheated to 250-350 DEG C, shielding gas is started, and automatic repair is started according to the planned path, the wire feeding speed and the welding speed. By means of the method, high-quality repair welding seams without pores and cracks can be obtained.

The application discloses a valve piece positioning type plasma arc welding equipment and relates to the technical field of plasma arc welding machines.The valve piece positioning type plasma arc welding equipment comprises a machining table, an arc welding gun body, a vertical rod fixedly connected to the top of the machining table, an elevating rail fixedly connected to the end of the vertical rod, an elevating sliding block slidingly connected to the inside of the elevating rail, and a fixed machine ring fixedly connected to one side of the elevating sliding block.The valve piece positioning type plasma arc welding equipment has the advantages that in the process of inside supporting positioning, a sealing pressure seat extrudes a sealing air bag, so that the sealing air bag is in close contact with the open end of a valve piece, the sealing air bag cooperates with the sealing pressure seat and a telescopic sleeve column to realize the sealing of the open end of the valve piece, back protection gas is introduced into the valve piece through the penetrating air holes, and thus, in the case of rapidly realizing the positioning of the valve piece, the sealing treatment is realized, so that the back of the welding point of the valve piece cannot be oxidized and the molten pool is stable.

The utility model belongs to the field of cables, and provides a high-voltage cable filled with an elastic semi-conductive buffer layer, which comprises a conductor; the insulating layer coats the outer surface of the conductor to ensure the stability of electric energy transmission; the conductor and the insulating layer are combined to form an insulating wire core, and liquid semiconductive foaming liquid is sprayed outside the insulating wire core through an argon arc welding process so as to foam outside the insulating wire core and form a semiconductive foaming buffer layer; and a metal aluminum sheath, an asphalt anti-corrosion layer, a non-metal sheath and a sheath outer semi-conductive layer are sequentially coated outside the semi-conductive foaming buffer layer from inside to outside. Compared with the prior art, the utility model has the advantages that the semi-conductive foaming buffer layer is sprayed on the surface of the insulation shielding layer in the production process of the argon arc welding process, so that on one hand, the process link of wrapping a buffer strip is omitted, the production efficiency is improved, and the production cost is reduced; and on the other hand, the important quality problem caused by damping of the buffer water-blocking tape is effectively avoided.

The application provides an automatic welding system and method for liquefied natural gas ship pipe manufacturing, wherein the welding area of the liquefied natural gas ship pipe is divided into multiple welding sub-areas through surface topography data of the welding area of the liquefied natural gas ship pipe; the posture reachable space of the arc welding gun end effector in the Cartesian space is determined, and multiple process control points of the ship pipe welding area are calibrated according to the feature correlation relationship between the weld geometric features of each welding sub-area in combination with the posture reachable space, and then the heat affected zone of each process control point under the thermal state is predicted; the preheating regulation and control parameters when the welding area of the ship pipe is welded are determined through the interaction relationship of the heat affected zones between adjacent process control points; the welding area is guided by heat energy according to the preheating regulation and control parameters, and then the weld fusion work of the welding area after the heat energy guidance is completed. The above scheme can avoid local thermal burn-through of the weld during welding based on the preheating regulation and control parameters.

1. The name of the design product: the pipe pliers (the mouth pliers, the force pliers). 2. The use of the design product: special-shaped / circular workpiece clamping positioning, accurate fixing of workpiece position in welding (such as spot welding, argon arc welding) operation, avoiding displacement during welding. 3. The design points of the design product: in shape. 4. The picture or photo that can best show the design points: perspective view.

The invention discloses automatic laser welding equipment for a convex seat and a ring of a stress application header pipe and a welding process method of the automatic laser welding equipment. The automatic laser welding equipment comprises a positioning point fixing device, a dust suction and exhaust device, a welding device of an integrated positioner, a 3D measuring camera, a welding robot, a robot controller, a water cooling machine, a laser, an integrated console and a voltage-stabilized source. All the components are integrally connected through cables or pipelines, the 3D measuring camera and the welding robot move synchronously, the water cooling machine and the dust suction and exhaust device form cooling and dust removal loops with related components respectively, and the stabilized voltage supply supplies power to all the components. The process method comprises the following steps: positioning and locking the convex seat through the bolt, and tacking a welding seam to ensure that a gap is less than or equal to 0.1 mm Inputting a theoretical model, scanning a real object, modeling and comparing, and automatically planning a track; and according to the logic of first scanning confirmation and second welding, 24 welding seams on the outer side and partial welding seams on the inner side are symmetrically completed, and the remaining welding seams on the inner side are completed after turning over. Manual argon arc welding is replaced by laser welding, the problem of automatic welding of pipelines of complex structures is solved, the welding technology level is improved, and the product quality consistency and the machining efficiency are improved.