37results about How to "Reduce welding distortion" patented technology

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 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.

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 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 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 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.

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.

This invention relates to the field of marine engineering and shipbuilding technology, and in particular to a construction process for the pile legs of a self-elevating wind power installation platform. The unfolded cutting length of the cylindrical steel plate is L1 = DP + δ1 + δ2 - δ4. The allowance on both sides of the steel plate is L2 = L3 + δ1 + δ2 = L3 + 4 based on the width of a single cylindrical section. The cutting must ensure that the straightness error is no greater than 1 / 1000 and ≤5mm, the perpendicularity error in the plate thickness direction is no greater than 1mm, the cutting bevel angle error is ±1°, the cutting depth is no greater than 0.5mm, and the parallelism of the unfolded cutting line is less than 2mm. Thin-layer, narrow-channel, multi-pass welding is used during welding, which can effectively reduce welding deformation and avoid incomplete fusion and slag inclusion defects in full penetration fillet welds. The welding qualification rate is over 98%, which not only has good quality, but also reduces deformation caused by repair welding, reduces costs, and shortens the construction period.

The barrel segment wallboard processing system and barrel segment wallboard processing method provided by the application comprise a workbench provided with a work guide rail, a welding unit provided on the work guide rail and provided with a first transmission mechanism, the welding unit being adapted to move along the work guide rail under the action of the first transmission mechanism and to frictionally weld stringers and skins, a milling unit provided on the work guide rail and provided with a second transmission mechanism, the milling unit being adapted to move along the work guide rail under the action of the second transmission mechanism and to mill the skins, and a clamping tool provided on the workbench and provided adjacent to the work guide rail between the welding unit and the milling unit, the clamping tool being adapted to limit the stringers and the skins. Such a design enables the stringers and the skins to be automatically welded and connected, improves the manufacturing efficiency of the storage tank, and facilitates the system to realize different processes and improve the application range due to the separate arrangement and independent movement of the welding unit and the milling unit.

This invention relates to a radiator grid structure and its forming process, belonging to the field of welding technology. It solves the problem that existing technologies lack suitable grid structures for radiator products, making it impossible to form open areas and thus hindering the lightweighting of radiator products. The radiator grid structure includes grid plates and baffles, with the baffles sequentially connected to form a closed loop. The grid plates are inserted into the internal space formed by the baffles to form open areas, and the ends of the grid plates are fixedly connected to the baffles. This invention achieves lightweighting of products in the aerospace field.

The application discloses an aluminum alloy box unequal-thickness butt joint friction stir welding method, which comprises the following steps: process placing of an upper panel of an aluminum alloy box, increasing a friction stir welding arc receiving plate area; cleaning the left panel, the right panel and the upper panel of the aluminum alloy box, adopting mechanical polishing and cleaning; positioning and assembling the left panel, the right panel and the upper panel on a tool, controlling the assembly gap and the misalignment to be not greater than 0.5 mm; setting the parameters of the friction stir welding, and welding the weld joints between the left panel and the upper panel and between the right panel and the upper panel. The aluminum alloy box unequal-thickness butt joint friction stir welding method utilizes the advantages of the friction stir welding to improve the welding deformation, improves the welding quality and improves the production efficiency.

This invention belongs to the field of welding technology and relates to a welding method for a large-size long girder mold made of nickel-iron alloy, comprising the following steps: 1. Preparing various plates of the mold; 2. Clamping the prepared plates on a machine tool and milling bevels at the joints of the plates; 3. Joining the plates together to form a mold blank, and welding the joints of the plates in layers and passes; 4. Annealing the welded mold blank; 5. CNC machining the annealed mold blank; 6. Inspecting the machined mold.

This invention discloses a welding process for high-manganese, high-alumina steel anchor chains, comprising the following steps: material preparation; ring bending; beveling; self-fusion root pass welding; filler layer welding on the front of the chain links; root cleaning; filler layer welding on the back of the chain links; and inspection. This invention uses high-manganese, high-alumina steel to manufacture the anchor chain. Due to the excellent impact resistance of high-manganese, high-alumina steel, it can effectively absorb the impact energy from the movement of engineering equipment in harsh marine environments, significantly improving the service life of the anchor chain and ensuring its safety during use. The welding process for high-manganese, high-alumina steel anchor chains provided by this invention solves many problems in the welding of high-manganese, high-alumina steel anchor chains in the prior art and is more suitable for the production of high-manganese, high-alumina steel anchor chains.

This invention discloses a high-wear-resistant and impact-resistant composite surfacing material and an automated surfacing process for agitator liner / blade. The surfacing material is a metal powder-cored welding wire, whose core powder composition, by weight percentage, includes: C: 0.8%~1.5%, Cr: 5.0%~8.0%, Mo: 2.0%~4.0%, V: 1.0%~2.5%, Nb: 0.5%~1.5%, WC: 20%~35%, with the balance being iron. After surfacing, a microscopic composite structure of "tough matrix embedded with multi-scale hard phases" is formed, with a 2~10 micrometer metallurgical reaction transition zone formed between the WC particles and the matrix interface. The automated surfacing process includes: pretreatment and matrix evaluation, three-dimensional digital reconstruction and adaptive path planning, precise heat input control based on the line energy formula, dynamic interpass temperature management, and a controllable slow cooling step. This invention, through synergistic innovation in materials and processes, achieves a weld overlay hardness ≥60HRC, an impact energy ≥28J, and a repair lifespan 1.5 to 2.2 times that of a new part, solving the technical problems of short lifespan and unstable repair quality of vulnerable parts in the mixing host.

The utility model discloses a kind of clamping devices for forklift gantry welding, including base, fixed base and clamping assembly;Fixed base is respectively set close to the both ends of base, fixed base includes bottom plate and fixed block, bottom plate is slidably arranged on base, and fixed block is connected with bottom plate;Clamping assembly includes connecting seat, push block and hydraulic cylinder, connecting seat is respectively set in the both ends of base, and there is spacing between connecting seat and fixed base, hydraulic cylinder is set on connecting seat, and hydraulic cylinder is connected with push block.The utility model controls different opening size according to the different position of different types of gantry, controls the movement of bottom plate, makes the movement of bottom plate drive fixed block to move, and then adjust the spacing between fixed base and connecting seat, so that workpiece can be placed smoothly on base, and start hydraulic cylinder, make hydraulic cylinder drive push block act on workpiece, to realize the clamping of workpiece, carry out reverse deformation control to gantry welding, reduce its welding deformation.

This invention relates to a method for controlling welding deformation of the rear floor assembly of an aluminum alloy body-in-white. The invention designs a method for controlling welding deformation of the rear floor assembly of an aluminum alloy body-in-white by controlling welding process parameters, clamping positions, and welding sequence, thereby reducing the degree of deformation of the aluminum alloy rear floor assembly profile during welding. After optimization, the average absolute value of the final welding deformation of the aluminum alloy rear floor assembly is reduced from 1.659 mm to 0.735 mm, a reduction of 56%, significantly lowering welding deformation. The significantly reduced welding deformation of the aluminum alloy rear floor assembly of this invention ensures welding quality and dimensional accuracy.

The utility model relates to the technical field of lower side beam structures, in particular to a lower side beam structure of a light-weight dumper, which comprises a horizontally arranged upper frame wing support, a bottom plate is laid at the upper end of the upper frame wing support, and a side carriage plate is vertically mounted at the edge of the bottom plate; the two ends of the upper frame wing support are connected with edge beam reinforcing plates which are vertically arranged respectively, the outer sides of the edge beam reinforcing plates are connected with a side compartment lower edge beam, and the edge beam reinforcing plates and the side compartment lower edge beam are of a mutual cohesion structure. The light-weight dumper lower edge beam structure is simple in structure, the overall welding stability is improved through the edge beam reinforcing plate, welding deformation is reduced, and therefore the overall compartment strength and rigidity are improved, and the dumper driving safety is improved.

The invention belongs to the technical field of laser welding, and particularly relates to an aluminum plate laser welding device with a thermal deformation control structure, which comprises a base, a PLC (programmable logic controller), a positioning clamp assembly, a welding position adjusting assembly and a side synchronous pressing and cooling assembly, the movable end of the welding position adjusting assembly is fixedly connected with a positioning frame, and the lower end of the positioning frame is fixedly sleeved with a laser welding head in an inserted mode. The two aluminum plates are symmetrically arranged, and laser is vertically and directly opposite to the center of a welding seam for incidence, so that the aluminum plates on the two sides are uniformly heated, temperature fields are symmetrical, and continuous and synchronous cooling is realized by matching with the circulating flexible heat-conducting tracks synchronously moving on the two sides of the welding seam, heat can be quickly guided out, the temperature gradient and thermal stress are reduced, and welding deformation is inhibited; and meanwhile, through stable pressing and fixing and non-sliding-friction contact, vibration displacement and surface scratching of the aluminum plate are effectively avoided, and the welding process stability and the joint quality are further improved.

The utility model relates to industrial cleaning equipment technical field, concretely is a kind of oil package assembly for multi-station cleaning equipment, including oil package front plate, oil package back plate, first oil package side plate, second oil package side plate and oil package lower plate, the side of oil package front plate is connected with first oil package side plate by first flanging, the other side is connected with second oil package side plate by second flanging, oil package back plate is connected with second oil package side plate by third flanging, each board is collectively enclosed and is formed into the back-to-back character structure with top opening, the inside of each board is equipped with multiple oil package bar plate, oil liquid flow channel is formed between adjacent oil package bar plate, and the communication port for oil liquid penetration is equipped between oil package back plate and oil package lower plate, the utility model is optimized structure layout and welding mode, avoid the stress concentration problem brought by traditional diagonal welding, enhance the overall rigidity and heat distribution uniformity, improve welding firmness, heat exchange efficiency and service life, applicable to the heat preservation and energy continuation demand of multi-station cleaning equipment.

The present application relates to the technical field of automobile differential, and particularly relates to an assembling method of a laser-welded differential assembly, a welding groove is formed along an axial direction at a connecting position of a main reduction driven gear and a differential housing, the main reduction driven gear and the differential housing are welded at the welding groove by a laser filler wire welding mode, and the welding groove is provided as an asymmetric structure, wherein a welding wire in the laser filler wire welding is a nickel-based welding wire, the welding groove is a Y-shaped groove in an asymmetric structure, the Y-shaped groove comprises a gear side slope surface and a housing side slope surface at an opening end, and the gear side slope surface and the housing side slope surface meet into a welding through hole extending along the axial direction at a side away from the opening. The present application provides a relationship of welding performance of the differential housing material, a method for calculating a carbon equivalent of spheroidal graphite cast iron welding, and a welding guidance method. The assembling between the differential housing and the main reduction driven gear is performed by the laser filler wire welding technology, so that the cost can be reduced, the light weight can be realized, and the reliability can be enhanced.

The application discloses a magnetic separator medium box welding device and process method, and belongs to the technical field of magnetic separator medium box welding. The device comprises a control unit of whole machine control, a rack, a laser welding module and a top surface fluctuation acquisition unit. The control unit is internally provided with a data entry module, a motion path control module, a path compensation calculation module, a path calculation module and a laser welding control module. A Y-direction transposition electric sliding table is fixedly arranged in the middle of the top surface of the rack. A medium box bearing platform is fixedly arranged on the sliding block of the Y-direction transposition electric sliding table. The magnetic separator medium box welding device and process method adopt a double symmetrical welding sequence, so that the deformation stress in the Z-axis and Y-axis directions is offset, the welding deformation is greatly reduced from the source, the overall sinking amount of the medium box is measured in real time through a displacement monitoring unit, high-precision full-closed-loop compensation is realized, and the automatic welding of the medium box to be welded is high in efficiency and high in quality.

The utility model discloses a kind of ship superstructure deck structures, it is located on passenger ship or roll-on / roll-off passenger ship;It includes ribbed plate unit;Ribbed plate unit includes transverse plate shape part and reinforcing rib, and the both ends of transverse plate shape part are respectively provided with joint part and groove type part;The bottom of transverse plate shape part is equipped with two reinforcing ribs, one of which is connected to the middle part of transverse plate shape part, and the other reinforcing rib is arranged below groove type part;Transverse plate shape part, reinforcing rib, joint part and groove type part are integrally formed;Ribbed plate unit is multiple, and multiple ribbed plate unit is sequentially connected to form superstructure deck;Among the adjacent two ribbed plate units of superstructure deck, the joint part of one ribbed plate unit is inserted in the groove type part of adjacent ribbed plate unit.

This invention relates to the field of aero-engine manufacturing technology, specifically to a method for manufacturing a casing. The method includes the following steps: machining a ring forging into a near-net-shape casing cylindrical part with welding bosses using a spin forming process; machining a boss part that matches the welding bosses; preheating the boss part located on the vibration side using a heating coil before welding, while simultaneously performing linear friction welding on the casing cylindrical part and the boss part; continuing heating with the heating coil after welding and holding the pressure for a preset time; performing post-weld heat treatment on the entire part after welding; and performing CNC machining after heat treatment to obtain the finished casing. The purpose of this casing manufacturing method is to solve the problems of large heat input, large deformation of thin-walled cylindrical parts, easy generation of welding defects, and difficulty in controlling weld quality in traditional casing manufacturing processes.

This invention discloses a welding device for automotive rear axle housings, belonging to the field of rear axle housing welding technology. It includes a base, with a chuck fixing seat fixedly mounted on one side of the top of the base. A stepper motor is fixedly mounted inside the chuck fixing seat, and the output end of the stepper motor extends out of one side of the chuck fixing seat and is fixedly connected to an electric chuck. By setting the chuck fixing seat and the internal stepper motor and electric chuck on the top of the base, and cooperating with the first electric telescopic rod, rotating seat, and clamping sleeve on the clamping frame, precise clamping of both ends of the rear axle body is achieved. Simultaneously, the two third electric telescopic rods and the pre-clamping frame in the pre-clamping mechanism pre-position and support the middle section of the rear axle body, forming a three-point positioning structure of "fixed ends + middle section support." This structure significantly improves the positioning accuracy and stability of the rear axle body, effectively reduces welding deformation, and improves the quality of the welded joint and the overall strength of the rear axle housing.

The application discloses a flared X-shaped groove welding joint and a process method, wherein the joint comprises a front groove and a back groove in a symmetrical structure; a land is arranged in the direction of the front groove from the back groove root face cleaning starting position; the back groove is locally provided with a platform; the platform is provided with an opening, and the root face cleaning operation is facilitated. The welding depth of the front groove is h1=t / 2+x-c / 2; the welding depth of the back groove is h2=t / 2-x+c / 2; wherein t is the plate thickness, x is the root face cleaning depth, and c is the land thickness. The process method comprises joint design, joint assembly, front groove and back groove welding; the flared X-shaped groove welding joint and the process method have the advantages of fewer root face cleaning steps, unchanged root face angle after root face cleaning, fewer internal defects of the welding seam, high angle trimming efficiency, and the welding quality and the welding operation efficiency are remarkably improved.

The present application relates to the field of material processing engineering, and particularly relates to a high-energy precise pulse cold welding method for magnesium-steel sheet welding, the principle of which is to use a high-power capacitor as a welding power source, to release a pulse arc with high energy density and concentration between a tungsten electrode and a welding piece in an instant during welding, and to realize the connection of the workpiece. In view of the poor interface metallurgical compatibility existing in the welding of magnesium-steel dissimilar metals, the high-energy precise pulse cold welding method is adopted to precisely control the pulse current, pulse time and pulse interval in the order of ms, to optimize the energy distribution of the joint, to accurately control the interface temperature of the magnesium-steel dissimilar metals, to regulate the characteristics of the intermetallic compounds of the interface, and to obtain a high-quality magnesium-steel fusion-brazing joint. Moreover, the welding device used in the welding method is simple in equipment, convenient in operation, low in welding cost and high in efficiency.

This utility model discloses a welding assembly fixture for a standard section assembly of a tower crane, specifically relating to the field of tower crane manufacturing technology. It includes a base, a main chord angle steel member on the top of the base, a support plate fixedly mounted on the top of the base, a node plate on the top of the support plate, and a positioning mechanism on one side of the support plate. The positioning mechanism includes a fixing block fixedly mounted on one side of the support plate, and support frames fixedly mounted on both sides of the fixing block. A small stepper motor is fixedly mounted on the top of one support frame, and a rotating shaft is fixedly mounted on the output end of the small stepper motor. The other support frame is rotatably connected to one end of the rotating shaft, and multiple positioning plates are fixedly mounted on the outside of the rotating shaft. This utility model ensures precise installation of the node plate and enhances stability. The insertion of the positioning pins into the fixing holes restricts the displacement of the node plate, providing a stable foundation for welding. It is flexible in operation and has versatility.