108results about How to "Reduce welding distortion" patented technology

The invention provides a welding residual deformation simulation prediction and parameter optimization method for a structural welding part, which comprises the following steps of: firstly, establishing a three-dimensional model of the structural welding part, and performing simulation analysis on a welding temperature field, welding residual stress and welding deformation of the three-dimensional model by using a professional simulation analysis tool; secondly, the influence of clamping conditions, heat source forms and welding parameters on welding deformation of the structural welding part is researched, and simulation and physical verification is achieved. And then, by taking the minimum welding residual deformation as an optimization target, optimizing the welding sequence by adopting a genetic algorithm and taking the welding sequence and the welding direction as design variables to obtain a group of optimal solutions, and obtaining the welding sequence with the minimum welding deformation through simulation. And finally, on the basis of a welding sequence optimization result, performing simulation optimization by utilizing tightening position adjustment and reversible deformation design in sequence to obtain a process design scheme with minimum welding deformation.

The invention discloses a laser welding machine assembly for self-positioning rotary welding, and belongs to the field of welding devices. Comprising a workbench, a rotatable welding table is arranged above the workbench, a laser welding head is arranged above the welding table, a gas conveying pipe is arranged in the laser welding head, a mounting plate is arranged on one side of the laser welding head, a swing assembly is arranged on the mounting plate, and one end of the swing assembly is connected with the laser welding head. According to the device, through the arranged connecting piece, during welding operation, the laser welding head can conduct swing welding operation, meanwhile, part of shielding gas is extracted through the action generated by the swing welding operation to be matched with output shielding gas, the covering range of the shielding gas is enlarged, and the welding quality of the device is further improved; defects generated during welding are effectively reduced, meanwhile, interference of plasmas on laser beams can be reduced, and the stability of welding operation is improved.

The invention provides a deformation control device and method in the additive manufacturing process of a GH4099 hollow thin-wall component, and relates to the technical field of high-temperature alloy additive manufacturing, the deformation control device comprises a laser welding device which comprises a rotary table and an expansion tool, and the laser welding device is fixed to a mechanical arm; a temperature control tool, a side clamp and an upper clamp are sequentially arranged above the rotary table from bottom to top, and a heating wire is arranged in the temperature control tool; the linear expansion coefficient of the expansion tool is higher than that of the temperature control tool, the side clamp, the upper clamp and the GH4099 hollow thin-wall component, the melting point of the expansion tool is lower than that of the GH4099 hollow thin-wall component, a sheet metal hole is formed in a top plate of the GH4099 hollow thin-wall component, and the wall thickness of the GH4099 hollow thin-wall component is not larger than 1 mm. The to-be-welded part and the tool are rotated through the rotary table, the laser welding device is kept relatively static in the welding process, the expansion tool is positioned inside, the expansion tool is heated to expand in the welding process, the to-be-welded part is fixed, the to-be-welded part is melted and flows out after welding is completed, and deformation control over the GH4099 hollow thin-wall component is achieved.

The invention provides an electron beam welding method for a ZL114A cast aluminum alloy oil tank product. The method comprises a pre-welding preparation step and a welding step. Wherein the welding part comprises the steps of spot fixed position welding and sealing welding of formal welding. According to the electron beam welding method provided by the invention, the defects of air holes, inclusions and the like in electron beam welding of ZL114A cast aluminum alloy fuel tank products are overcome.

The invention discloses a zirconium-nickel dissimilar metal welding method based on active regulation and control of a temperature field. The zirconium-nickel dissimilar metal welding method comprises the following steps that S1, base metal is cleaned; the butt-joint end faces and the welding surfaces of the zirconium and nickel alloy pipes are polished and cleaned, and clean zirconium and nickel base materials are obtained; s2, a to-be-welded part is assembled; the to-be-welded end face of the clean base metal is assembled in a protective gas cavity of the rotary clamping device; s3, welding is conducted; a laser scanner is adopted for welding at a preset welding position, heat source gradient distribution of base metal at the two ends of a welding seam is controlled by regulating and controlling laser power, welding seam temperature field feedback is established through an infrared temperature sensor, and real-time monitoring and laser power regulating and controlling are conducted; s4, postweld heat treatment; and the laser power is adjusted in real time according to welding seam temperature field feedback so as to adjust and control the welding seam cooling process. According to the method, effective connection of zirconium-nickel indissolvable metal is achieved by controlling the regional welding temperature field, the temperature range for forming brittle compounds is avoided, the uniformity of a molten pool between Zr and Ni materials is ensured, and welding defects such as hot cracks and air holes are reduced.

The invention belongs to the technical field of battery box body welding, and discloses a water-cooling battery box body applying an FSW welding technology, the water-cooling battery box body comprises an aluminum alloy box body, the aluminum alloy box body comprises an upper shell, a lower shell, a fixed side skirt and a predetermined welding groove, the upper shell and the lower shell are symmetrically arranged up and down, and the upper shell and the lower shell are symmetrically arranged up and down; a fixed side skirt is integrally formed on the outer side faces of the ends, close to each other, of the upper shell and the lower shell. According to the method, the battery box is fixed through the clamp made of steel, the bolts and the positioning pins, displacement in the welding process is effectively prevented, the welding precision and stability are guaranteed, meanwhile, fine adjustment is conducted on welding parameter setting, including the rotating speed of a welding tool, the feeding speed, the diameter of the tool, the shoulder width of the tool and the like, and welding quality is improved. Therefore, the uniformity of the welding process and the quality of a welded joint are ensured. In the welding process, preheating treatment and reasonable welding sequence and welding position planning are adopted, and the welding efficiency and the joint quality are further improved.

The invention relates to the technical field of stator core production, in particular to a motor stator core automatic processing and forming method, which comprises a first punching mechanism, a second punching mechanism, a first feeding mechanism, a second feeding mechanism, a lamination conveying mechanism, an assembling jig, a welding mechanism and a discharging mechanism, the first punching mechanism is used for punching a first stator iron sheet, the second punching mechanism is used for punching a second stator iron sheet, the first feeding mechanism is used for grabbing a first stator iron sheet punched by the first punching mechanism and placing the first stator iron sheet on the assembling jig to be assembled into a first stator iron ring, and the second feeding mechanism is used for grabbing the second stator iron sheet punched by the second punching mechanism and placing the second stator iron sheet on the assembling jig to be assembled into a second stator iron ring. And stacking the first stator iron rings placed on the assembling jig to form a second stator iron ring. By means of a series of automatic and precise processing steps, efficient, precise and stable production of the stator iron core is achieved. According to the method, the production efficiency is improved, the production cost is reduced, and the quality and reliability of products are remarkably improved.

The invention discloses a heat exchanger tube plate and barrel welding seam welding process. The process comprises the following steps of A, preparation before welding; b, the aluminum gasket is machined; c, assembling an aluminum gasket; d, a plurality of rigid fixing blocks are welded to the outer edges of the two tube plates; e, the two tube plates are arranged between the two barrels and assembled in pairs; f, the two tube plates and the two barrels are subjected to manual arc welding and tack welding; g, preheating before welding; h, manual argon tungsten-arc welding backing weld bead welding; i, manual arc welding filling cosmetic welding bead welding is conducted; J, after welding seams are cooled, all rigid fixing blocks are polished and removed, and welding scars are polished to be flush with base metal; k, polishing and removing all defects on two sides of the weld to ensure that the weld surface must be in smooth transition with the outer surfaces of the tube plate and the cylinder; and L, nondestructive testing. By means of the welding process, the welding quality is stable and reliable during large-diameter heat exchanger tube plate welding, and component welding deformation can be controlled within the design requirement range.

The invention belongs to the field of pipeline prefabrication and assembly, and provides a pipeline prefabrication flexible assembly working platform which comprises a construction assembly. Comprising a structural part, a stand column adjusting mechanism arranged on the upper side of the structural part, an angle seat adjusting mechanism arranged on the upper side of the structural part, a box body assembling mechanism arranged on the upper side of the structural part and a clamping mechanism arranged on the upper side of the structural part, and the structural part comprises an assembling platform support and an assembling platform plate installed on the upper side of the assembling platform support; the stand column adjusting mechanism comprises a stand column base arranged on the upper side of the assembling platform plate and a first lead screw lifting column arranged on one side of the stand column base. According to the flexible assembly working platform for pipeline prefabrication, the structure assembly, the stand column adjusting mechanism, the angle seat adjusting mechanism, the assembly box body mechanism and the clamping mechanism are integrated, and the linear sliding rail is ingeniously arranged on the upper side of the assembly platform plate, so that the positions of all the mechanisms can be flexibly adjusted on the linear sliding rail; therefore, the adjusting flexibility and the positioning precision of pipeline prefabrication assembly are remarkably improved.

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 present invention belongs to the field of weld heating welding technology, and discloses a multi-stage heating device for thick-walled pipe welds, including a base, a coolant storage tank fixedly connected to the upper surface of the base, four evenly distributed table legs fixedly connected to the lower surface of the base, a support column and a curved pipe fixedly connected to the upper surface of the coolant storage tank, a straight pipe fixedly connected to one end of the curved pipe, a support column fixedly connected to one end of the straight pipe, a heating plate fixedly connected to the outer edge of the other end of the straight pipe, a temperature regulating and pressurizing mechanism fixedly connected to the curved pipe is provided inside the curved pipe, two sliding grooves are fixedly connected to the upper surface of the base, and a cylinder is fixedly connected to the lower surface of the base. The present invention can effectively control the temperature in the welding process through the principle of thermal expansion and contraction of the medium inside the shell when the temperature of the heating plate is too high, reduce heat waste, shorten welding time, and improve production efficiency through the design of the temperature regulating and pressurizing mechanism.

The sleeper beam assembling and welding production line comprises a welding robot, a welding head is mounted on a mechanical arm of the welding robot, and a mounting cylinder, a vibration column and a vibration mechanism used for driving the vibration column to vibrate are arranged on one side of the welding head; a switching head is rotationally mounted at one end of the vibration column, a vibration head and a flame spray gun are mounted on the switching head, a cooling channel is formed in one end of the vibration head, and a driving mechanism used for driving the switching head to turn over is arranged on the mounting cylinder; when welding stress relief operation is carried out, one driving mechanism drives the switching head on the driving mechanism to turn over until the vibration head on the driving mechanism is aligned with a welding seam on one side, and the other driving mechanism drives the switching head on the driving mechanism to turn over until the flame spray gun on the driving mechanism is aligned with the welding seam on the other side. The obvious temperature difference is formed on the welding seams on the two sides of the web welding part, the vibration energy is transmitted into the web welding part through the vibration head, the welding stress removing efficiency can be remarkably improved, the reliability of the welding seam area is improved, and welding deformation is restrained.

The application provides a straddle type bogie frame and a straddle type monorail vehicle, the straddle type bogie frame comprising a combined beam and a down bending beam, the combined beam comprising a high side beam, a low side beam, a traction beam connecting the high side beam and the low side beam, and an end beam connecting the high side beam and the low side beam, the number of the down bending beams being two, and the two down bending beams being connected with the high side beam and the low side beam respectively, and the combined beam and the down bending beam being connected in a T joint fillet welding and V type butt joint welding mode. The straddle type bogie frame and the straddle type monorail vehicle are formed by combining and welding the combined beam and the down bending beam formed in a split mode, the air chamber is independently formed in the down bending beam, the low side beam and the high side beam are decoupled, the structure is better in stress bearing, and the weld accessibility is better; the combined beam serves as a base, and when the combined beam is combined with the down bending beam, the overall welding deformation is small, the combined beam is not prone to twisting, and the size after welding is easy to control.

The invention discloses a novel hinge expansion joint for high-temperature flue of flue gas turbine, comprising: end pipe I, end pipe II, bellows, load-bearing frame I, load-bearing frame II, two sets of hinge mechanisms and eight sets of supporting components; end pipe I, bellows and end pipe II are connected in sequence; load-bearing frame I is located at the side of end pipe I and supports end pipe I through four sets of supporting components; load-bearing frame II is located at the side of end pipe II and supports end pipe II through another four sets of supporting components; two sets of hinge mechanisms are installed between load-bearing frame I and load-bearing frame II. The invention ensures the long-term operation of the expansion joint under high-temperature working conditions and improves the service life of the product.

The invention relates to a thin-wall complex flow channel liquid cooling structure high-energy beam welding method, and belongs to the field of metal materials and processes. Manufacturing an assembling and shape correcting clamp; the fixed base is horizontally placed, and the thin-wall complex flow channel liquid cooling structure is horizontally placed on the upper surface of the fixed base; horizontally placing a cover plate on the upper surface of the thin-wall complex flow channel liquid cooling structure; a pressing plate is horizontally placed on the upper surface of the cover plate; the pressing plate is fixedly connected with the fixed base through a tensioning screw; spot welding is conducted on the cover plate, and after spot welding is completed, the pressing plate is dismantled; formally welding the cover plate; after welding is completed, stress relief annealing treatment is conducted at high pressure and high temperature, and forming is conducted; according to the method, the welding seam is smooth and good in forming after welding, the internal quality meets the QJ20645-2016 requirement, the pressure of the laser welding seam is maintained for 60 min under 0.8 MPa, the laser welding seam is fatigued for 1000 weeks under 0.8 MPa, the leak rate is smaller than or equal to 1.0 * 10 <-10 > Pa.m < 3 > / s, the strength coefficient of a laser welding joint is larger than or equal to 0.9, and the flatness is smaller than or equal to 0.2 mm.

This application belongs to the field of friction stir welding technology, and specifically relates to a friction stir welding apparatus, a friction stir welding method, and a workpiece. The friction stir welding apparatus includes a stirring head and a follower pressure ring. The stirring head includes a shoulder and a stirring pin connected to the first end of the shoulder. The follower pressure ring has an inner hole, and the stirring head is movably inserted into the inner hole. The end face of the first end of the shoulder is flush with the lower end face of the follower pressure ring. The follower pressure ring forms a cavity with the shoulder on one side in the welding forward direction, and the lower end face of the other side is a plane. The above structure not only enables friction stir welding through the stirring head, but also allows the lower end face of the follower pressure ring to press down on the welded area, thereby restraining and eliminating flash.

The present invention discloses a pressure sensing support device for a turbine partition body, comprising a base, a cylinder, a guide rail, a dustproof plate, a lower mounting plate, a connecting plate, a connecting shaft, an electric cylinder, a horizontal floating joint, a connecting block, an upper mounting plate, a linear bearing, a top mounting plate, a pressure sensor, a top floating joint, a slide groove, an inclined block, a locking handle, an adjustment foot and a drag chain, which respectively constitute a horizontal adjustment component, a support platform, a vertical top pressure adjustment component and a pressure measuring component of the device. The device has a simple structure, is easy to operate and has a low cost. A set of devices provides a supporting force to offset welding deformation and can be adapted to workpieces of different specifications, thereby effectively reducing the intensity of manual labor.

The invention discloses an LNG (Liquefied Natural Gas) ship liquid cargo deck building method, which is characterized in that the original welding operation of a stainless steel plate and a carbon steel plate on a large-group jig frame is advanced to a plate splicing stage, so that the continuity of the operation of a large group on the large-group jig frame can be effectively ensured, the manufacturing period of the large group on the jig frame is obviously reduced, and the production efficiency is improved. Meanwhile, on the basis that the original total welding length is kept unchanged; a T-shaped seam and a cross-shaped seam formed between a stainless steel plate and a first carbon steel plate, a butt seam in the stainless steel plate, a linear segment weld seam formed between the first carbon steel plate and the stainless steel plate and between a second carbon steel plate and the stainless steel plate, a weld seam at the position where the stainless steel plate is turned into a circular bead and a butt seam between the first carbon steel plate and the second carbon steel plate are sequentially welded through automatic welding. The butt joints between the first carbon steel plate, the second carbon steel plate and the third carbon steel plates and the butt joints between the adjacent third carbon steel plates can remarkably shorten the welding operation time and improve the welding efficiency.

The utility model relates to the technical field of cylinder welding supporting, and discloses a cylinder welding hydraulic circle supporting device which comprises a rotating cylinder, an air cylinder is fixedly connected to the interior of the rotating cylinder, a fixing ring is fixedly connected to the outer wall of the air cylinder, a pushing piece is fixedly connected to the output end of the air cylinder, and a first rotating shaft is rotationally connected to the interior of the pushing piece. A first rotating block is fixedly connected to the outer wall of the first rotating shaft, a second rotating shaft is rotatably connected to the interior of the first rotating block, an inner supporting plate is fixedly connected to the outer wall of the second rotating shaft, a first rotating rod is fixedly connected to the interior of the inner supporting plate, and a second rotating block is rotatably connected to the outer wall of the first rotating rod. According to the welding device, the air cylinder is started to push the push piece to slide, the first rotating shaft, the first rotating block, the second rotating shaft, the inner supporting plates, the first rotating rod and the second rotating rod are matched, the four inner supporting plates are used for supporting the cylinder body, and the effects that pressure is evenly applied through the inner supporting plates, and it is guaranteed that the cylinder body is always kept round in the welding process are achieved.

The application discloses a kind of semiconductor water-cooled ring part machining process method, and semiconductor water-cooled ring part includes two parts of water-cooled ring main body and a cover plate, and the body is opened with annular groove feature, cover plate is placed in ring groove, and sealed water channel structure is formed by welding method, and processing method includes twice machining and once welding. Among them, first machining processes water-cooled ring main body and cover plate respectively, and annular groove feature is machined on the front and back of water-cooled ring main body respectively, and cover plate is assembled on both sides during welding, and the front and back are welded respectively, and second machining cuts open the part after welding in the center position of main body thickness direction using wire cutting method, to form two water-cooled ring parts.The process method of the application is welded on both sides, which can effectively reduce the welding deformation, and there is no need for straightening after welding, and two water-cooled rings can be formed after machining once, which can improve production efficiency.

This invention relates to an electron beam welding method for ZL114A / ZL270 dissimilar aluminum alloy materials, belonging to the field of electron beam welding technology. It addresses one of the problems encountered in existing electron beam welding methods for ZL114A / ZL270, namely, the presence of obvious cracks, incomplete fusion, and excessive internal porosity within the weld seam. The electron beam welding method of this invention includes: tack welding of assembled ZL114A and ZL270 alloy test plates; welding using a dual electron beam synchronous welding method with one electron beam preheating the weld seam first, followed by the other electron beam for the final welding; during the final welding process, the center of the electron beam spot is shifted from the butt joint of the test plates towards the ZL270 alloy plate side.

The application provides a manufacturing method of a forklift fork frame assembly, which comprises the following steps: step S1, vertical plate cross beam assembly assembling and welding: using a tool to clamp and position a lower cross beam, an upper cross beam, a right rib plate, a right vertical plate, a left vertical plate and a left rib plate, assembling and welding the vertical plate cross beam assembly; step S2, vertical plate cross beam assembly processing: after the vertical plate cross beam assembly is cooled to normal temperature after welding, a fitting surface for assembling with each roller seat is processed on the right vertical plate and the left vertical plate respectively; step S3, fork frame assembly assembling: assembling the processed vertical plate cross beam assembly with the right side plate, the left side plate and each roller seat into a fork frame assembly; and step S4, fork frame assembly welding: welding the assembled fork frame assembly. The application can effectively reduce the welding deformation of the fork frame assembly, and can also better ensure the position precision of each fitting surface, and the position precision of the left side plate, the right side plate and each roller seat is high, and the production efficiency is high.

The invention relates to the technical field of temperature and pressure monitoring cable splicing, and provides an SAGD lifting operation temperature and pressure monitoring cable rapid splicing cold welding method which comprises the following steps: S1, preparation work; s2, point solidification is carried out; s3, welding is conducted; s4, post-welding treatment is carried out; s5, a welding seam is inspected; according to the method, a stable and uniform welding foundation can be provided for subsequent argon tungsten-arc welding filling and capping through cold welding bottoming, and the overall welding quality can be improved; argon tungsten-arc welding which has the advantages of being concentrated in heat, narrow in weldment heat affected zone, small in welding deformation and high in welding quality is selected for seam filling so as to ensure the sealing performance, and then argon tungsten-arc welding is used for covering so as to ensure the attractiveness and the protection effect of welding seams; the method is suitable for high-temperature underground operation of SAGD, fireflooding, electric heating wells and the like due to simple and convenient operation and good sealing performance and corrosion resistance, and the use requirements in different environments are met.

The invention discloses a tailor-welded component manufacturing method and a tailor-welded component, and the tailor-welded component manufacturing method comprises the following steps: performing combined blanking on each splicing section to obtain a unit combined blanking plate of each splicing section; the splicing end of each unit combination blanking plate is subjected to pre-welding machining; splicing and welding the splicing ends of all the unit combined blanking plates to obtain a component combined blanking plate; the component combination blanking plate is divided into at least two tailor-welded components, so that at least two original independent short welding seams can be connected into a single long welding seam, continuous automation of pre-welding processing, welding seam welding and welding seam flaw detection can be realized, the production efficiency is greatly improved, meanwhile, arc starting and arc stopping are reduced through combined production, and the production cost is reduced. In addition, by means of combined production, the length-width ratio of the component combined blanking plate obtained through tailor welding can be remarkably reduced, the rigidity is improved, and welding deformation is reduced.

The utility model discloses a rail transit linear motor induction plate, including back iron and set up on the aluminium cover plate of back iron, its characterized in that, the upper surface of aluminium cover plate (10) forms a plurality of parallel arrangement's V -shaped groove (11), and the section of each V -shaped groove (11) is trapezoidal. The utility model's structure standardizes secondary induction eddy current path, weakens horizontal lateral end effect, and can effectively reduce secondary induction plate loss. Compared with linear rectangular groove, V -shaped groove structure can make vehicle traction force continuous and stable, and the two edges of horizontal direction V -shaped groove provide centering induction force, so that vehicle has no offset lateral force.

The utility model relates to ventilation equipment, in particular to an anti-deformation shutter ventilation fence which comprises an upper frame, a lower frame, a left frame, a right frame, a first positioning clamping strip, a second positioning clamping strip and shutter blades which are connected with one another, the left frame comprises a first plate body, the right frame comprises a second plate body, the first positioning clamping strip is connected with the first plate body, and the second positioning clamping strip is connected with the second plate body. The first positioning clamping strip is connected with the first plate body, the second positioning clamping strip is connected with the second plate body, a plurality of first clamping grooves are formed in the upper edge of the first positioning clamping strip, a plurality of second clamping grooves are formed in the upper edge of the second positioning clamping strip, and the two ends of the louver blades located on the lower layer are clamped in one first clamping groove and one second clamping groove respectively. Third clamping grooves are formed in the upper edge of the first plate body, fourth clamping grooves are formed in the upper edge of the second plate body, and the two ends of the louver blades located on the upper layer are clamped in one third clamping groove and one fourth clamping groove respectively. Welding workload can be reduced, the problem of welding deformation is solved, and cost is reduced.

The application discloses a construction method of a space special-shaped tree column structure, which comprises the following steps: after a layer of steel rod members are installed and a first layer closed loop structure is formed, the steel rod members are continuously assembled to the next layer; after the steel rod members of the next layer form a second layer closed loop structure, butt joints of vertical rod members of the steel rod members of the first layer closed loop structure are welded; after the butt joints of the vertical rod members are welded, butt joints of horizontal rod members of the layer of steel rod members are welded; after the butt joints of the horizontal rod members are welded, the next layer of steel rod members is continuously assembled on the basis of the second layer closed loop structure; after a third layer closed loop structure is formed, the butt joints of the steel rod members of the second layer closed loop structure are welded; and the welding is sequentially and intervally performed until the last layer of steel rod members is welded. The application can reduce or avoid the welding seam deformation of the complex space special-shaped structure, and greatly improves the construction quality.

The invention discloses a method for improving the manufacturing precision of a welded double-layer tube plate. The method comprises the following steps: step 1, respectively carrying out rough turning, finish turning and drilling on an inner tube plate and an outer tube plate in the double-layer tube plate; 2, the inner tube plate and the outer tube plate are oppositely arranged, and after the tube holes of the inner tube plate and the outer tube plate are aligned, the inner tube plate and the outer tube plate are fixed together through fasteners; 3, the double-layer tube plates fixed together are placed on a lathe to be aligned; 4, after alignment is completed, turning a welding groove of one tube plate, and turning an alignment reference when a welding groove of the other tube plate is formed in the outer circle; 5, the double-layer tube plate is turned over, the outer circle turned in the step 4 and the end face turned in the step 4 are aligned, and a welding groove of the other tube plate is turned; step 6, performing tube hole coaxiality detection on the inner tube plate; 7, after the tube hole coaxiality is detected to be qualified, the double-layer tube plate is precisely welded; and 8, penetrating the pipe through the pipe hole. The method has the advantages of high tube hole coaxiality and high welding groove assembly precision of the inner and outer tube plates.

The invention discloses a welding device and method for an auxiliary fuel tank, and relates to the field of aircraft auxiliary fuel tank welding. Each girth welding machine tool comprises a headstock and a tailstock which are arranged on the rigid base; the girth welding inner supporting and outer pressing positioning clamping system is arranged on a girth welding machine tool and comprises an inner supporting tool and an outer pressing positioning tool, the inner supporting tool comprises an inner supporting tool support and a plurality of expansion blocks, an inner supporting air cylinder is arranged in the inner supporting tool support and connected with the expansion blocks, and the outer pressing positioning tool comprises a tool frame and an annular key mechanism. The annular key mechanism is connected with the headstock or the tailstock through the tool frame. The annular key mechanism comprises a plurality of key assemblies and a driving unit. The welding device can ensure that the roundness, the perimeter, the welding seam assembly gap and the alignment tolerance consistency of the butt joint girth welding port of the conical cylinder section of the airplane auxiliary fuel tank meet the requirements.

This invention discloses a method for unsteady-state ultrasonic standing wave-assisted control of fusion welding. It utilizes dual ultrasonic transducers to perform dual-wave interference, forming an ultrasonic standing wave. This ultrasonic standing wave is introduced into the fusion welding process, and its action on the welding area allows for real-time control of the microstructure and properties of different parts of the weld joint. This forms a unsteady-state ultrasonic standing wave with controlled directional movement of the wave packet nodes, which is then used to regulate the microstructure and properties of the weld joint. This invention enables control over the direction and speed of movement of the unsteady-state ultrasonic standing wave wave packet nodes, allowing for regional control of the microstructure and properties of different parts of the weld joint, resulting in a more uniform joint composition and microstructure. It can solve problems such as undercut, burn-through, high residual stress, severe deformation, and columnar crystals that reduce joint performance during the welding of thin materials or fine wires, refining grains and improving joint performance. It can achieve controllable connections from the centimeter scale to the micrometer scale.