91results about How to "Precision welding" patented technology

The invention relates to an automobile body-in-white welding process planning method, which comprises the following steps of: performing data acquisition through terminal equipment, collecting welding process data in a welding process, and monitoring the running state of a welding robot in real time; edge computing nodes are arranged on a welding site and are responsible for preprocessing collected welding process data and extracting knowledge in real time; the cloud constructs a welding process knowledge graph according to the existing enterprise historical data and the welding process data extracted by the edge end knowledge; and after the cloud establishes a welding process knowledge graph, optimizing body-in-white welding process parameters and carrying out optimization solution on a body-in-white welding path and a body-in-white welding spot welding sequence on the basis of an improved artificial neural network-based automobile body-in-white welding process planning method. The method can adapt to different welding scenes and requirements, the method can adapt to shapes and materials of different workpieces, and efficient and accurate welding is achieved.

The invention belongs to the technical field of welding, and discloses a dissimilar metal power modulation galvanometer laser welding method which comprises the following steps: finely cleaning a 6061 aluminum alloy and a 304 stainless steel plate by using acetone, and then airing for more than 20 minutes; the aluminum steel sheet is assembled, pressed and fixed on a welding test platform in a steel-up-aluminum-down mode; the position of the welding test platform is adjusted, argon serves as welding protection gas, and a protection gas nozzle is arranged to be aligned with a welding pool area; laser welding parameters are set, a laser power modulation mode is set to be a gradient power mode, and the gradient power mode is to regulate and control phase point laser power in a circular scanning track in the advancing direction of a welding seam; a welding test is carried out in the mode that a galvanometer laser head is fixed and a welding test platform is moved, and a laser and the welding test platform are synchronously started and stopped; and the protective gas is started 5 seconds before the laser is started, and after the laser is stopped, the protective gas is stopped lagging for 10 seconds so as to continuously protect the welding seam and prevent oxidation.

The invention discloses an automatic welding device and method for FPSO ship body transverse butt welding seams, the automatic welding device comprises ship body steel plates and an equipment moving bottom plate, the number of the ship body steel plates is two, connecting grooves are formed in the side portions of the two ship body steel plates close to each other, and a fixing column is installed on the equipment moving bottom plate through a lifting height adjusting assembly; according to the ship body steel plate welding device, the contact roller is always in contact with a ship body steel plate during welding through the arranged contact self-adaptive adjusting assembly, the welding head can adjust the position in a self-adaptive mode and is always located at the position of one side of a welding seam, welding is more accurate, a connecting groove is polished through the arranged polishing assembly before welding, the welded part is smoother and smoother, and welding quality is improved. Stability after welding is facilitated, the problem that the welding quality is affected due to the fact that a welding part has rust is solved, chippings and rust are blown away through the air blowing assembly after grinding, and therefore the position of a connecting groove is cleaner, and the welding quality is guaranteed.

The invention relates to the field of stainless steel pipe machining, in particular to a stainless steel pipe splitting machine which comprises a supporting unit, and a cutting assembly and a cutting assembly are arranged on the supporting unit. The supporting unit comprises two rectangular frames symmetrically erected on the ground, each rectangular frame is provided with a driving assembly, the driving assemblies are used for driving stainless steel pipes to rotate and comprise first lead screws arranged in the rectangular frames, the first lead screws are in threaded connection with sliding blocks, and driving motors are arranged on the two sides of the upper ends of the sliding blocks. The end part of the driving motor is fixedly connected with a wheel body; the surface of the stainless steel pipe is extruded on the surface of the wheel body; the designed stainless steel pipe splitting machine, the designed cutting assembly and the designed cutting assembly are matched with one another to machine the stainless steel pipes, cutting into grooves and cutting off and segmenting are sequentially completed, stainless steel pipe materials do not need to be transferred in the period, compared with an existing machining mode, multiple links can be omitted, the production and machining efficiency can be improved, and when the cutting assemblies are executed, the machining efficiency is improved. Two grooves can be machined at the same time, and efficiency is improved.

The invention provides metal welding equipment and a using method thereof, and belongs to the technical field of welding, the metal welding equipment comprises a base, a workbench, a welding machine, a protection frame, a positioning cylinder, a clamping correction mechanism and a rotating mechanism, the workbench is fixedly connected to the center of the top of the base; the welding machine is arranged on the upper side of the workbench. The protection frame is fixedly connected to the top of the base, and the two positioning cylinders are arranged on the two sides of the workbench correspondingly and rotationally connected into the protection frame; the two clamping and correcting mechanisms are arranged on the corresponding positioning cylinders correspondingly and used for clamping and fixing the pipe fitting and correcting the position. The rotating mechanism is arranged on the base and used for driving the two positioning cylinders to rotate synchronously so as to be matched with the welding machine to conduct welding work. The automatic correction function is achieved when the pipe fitting is fixed, it is guaranteed that the pipe fitting can be accurately welded, deviation is avoided, annular welding work and automatic welding operation are achieved in cooperation with a welding machine, and the working efficiency is effectively improved.

The invention relates to the technical field of manufacturing of micro parts of electronic equipment, in particular to a rotating shaft decorating part of a folding screen mobile phone and a preparation method of the rotating shaft decorating part. The rotating shaft decorating part comprises a metal connecting part, an injection molding part and a metal plate, and the metal connecting part comprises a first end extending in the vertical direction and a second end extending from the bottom of the first end in the transverse direction; the second end comprises a first side face and a second side face which are oppositely arranged in the vertical direction. The injection molding part comprises a wrapping part wrapping the first end, an extension part attached to the first side face and a reinforced connecting part extending in the vertical direction. The extension part is connected with the wrapping part, and the reinforced connecting part is connected with the extension part; the metal plate adheres to the second side face and the reinforcing connecting part and is welded to the second end. On one hand, the connecting strength of the injection-molded part and the metal connecting part is enhanced, the probability that the injection-molded part is separated from the metal connecting part is reduced, on the other hand, the connecting strength of the injection-molded part and the metal part is also enhanced, and the probability that the injection-molded part is separated is reduced.

The utility model discloses a stainless steel inner floating disc welding device. The device comprises a shell, four first sliding rails are fixedly connected to the inner surface of the shell, four first sliding blocks are slidably connected to the inner surfaces of the four first sliding rails, a shielding cover is fixedly connected to the rear surfaces of the four first sliding blocks, the shielding cover communicates with an exhaust box shell, and an exhaust assembly is arranged on the exhaust box shell; two filter screens are fixedly connected to the inner surface of the exhaust box shell, a light-proof window is formed in the shielding cover, two first sliding rods are fixedly connected to the inner surface of the shell, two first electric telescopic rods are fixedly connected to the inner surface of the shell, and second sliding blocks are fixedly connected to the other ends of the two first electric telescopic rods correspondingly; the two second sliding blocks are slidably connected to the first sliding rods correspondingly, through the structure, generated harmful gas can be absorbed in the welding process, strong light can be shielded, and the safety of workers is protected.

The utility model provides a seamless steel tube welding support device, which relates to the technical field of seamless steel tube welding support and comprises a bottom plate, two mounting plates are arranged on the bottom plate, circular grooves are arranged on the mounting plates, a mounting structure is arranged on the two mounting plates jointly, the mounting structure mainly comprises two rotating rings, and the rotating rings are arranged on the bottom plate. The two rotating rings are both rotationally connected to the mounting plate, first gears are fixedly connected to the rotating rings, second gears are connected to the first gears in an engaged mode, the second gears are rotationally connected with the mounting plate, an outer rod is fixedly connected to one second gear, an inner rod is fixedly connected to the other second gear, and the outer rod is fixedly connected to the inner rod. According to the welding device, the problems that a seamless steel pipe needs to be welded by a circle along the outer diameter, the connecting position located at the bottom is shielded by the steel pipe, welding is not convenient for workers, and the welding precision is reduced are solved.

The utility model is suitable for the technical field of sheet metal part welding, and provides a sheet metal part welding device which comprises a base, an L-shaped back plate, a welding platform and a welding platform, wherein the top of the base is provided with the L-shaped back plate; the transverse limiting rods are fixedly mounted on the inner wall of the base; the two limiting grooves are formed in the base; the butt joint mechanism is arranged on the base, and the butt joint mechanism is used for butt joint of sheet metal parts; the two turnover mechanisms are arranged on the butt joint structure and used for controlling the sheet metal parts to turn over; and the two clamping and fixing mechanisms are arranged on the two overturning mechanisms correspondingly, and the two clamping and fixing mechanisms are used for clamping and fixing the sheet metal parts. The sheet metal part welding device provided by the scheme not only has the functions of clamping, fixing and butting sheet metal parts, but also can control the sheet metal parts to turn over in the welding process, so that the welding process is time-saving and labor-saving, and the welding efficiency is relatively high.

The utility model discloses a welding wire and laser center aligning structure for laser welding, relates to the field of laser welding, solves the problem that the position of a welding wire part is difficult to adjust for follow-up efficient welding according to the requirements of the position and specification of a welding seam in the conventional device, and adopts the following scheme that the welding wire and laser center aligning structure comprises a laser welding head, a main body of the clamping assembly is a clamping sleeve, a fixing table is fixedly installed at the top of the clamping sleeve, the fixing table is slidably sleeved with a sliding table, and a wire feeding assembly is assembled on the top side of the sliding table; a welding wire part is arranged in the wire feeding assembly; according to the welding wire and laser center alignment structure for laser welding, through the arrangement of a wire feeding assembly in a clamping assembly on the top side of a laser welding head, a wire feeding pipe can be pressed on the inner side of a pipe groove in the wire feeding assembly by screwing an adjusting bolt, the position of a welding wire part at the front end of the wire feeding pipe is synchronously adjusted, and therefore the contact position of the welding wire part and laser at the front end of the laser welding head is adjusted; and the precise welding effect is achieved.

The utility model provides an auxiliary structure that inverter sheet metal is used, relates to sheet metal processing technical field, include: bottom plate, the left and right sides of bottom plate top all weld a block adjusting support board, the left and right sides of bottom plate top still weld two groups of four guide posts, four guide posts outside all install a spring, still slide and install a block lower pressure plate between the two groups of guide posts of bottom plate top, the left and right sides of the top of two block adjusting support boards are all through thread screw joint has a locating screw, the left and right sides of the front of side support board also weld two groups of four guide posts, the guide post outside slide and install a block side pressure plate of side support board front, the left and right sides of side support board front still rotate and install two screw rods. This structure can clamp and fix when welding sheet metal part, will not appear the condition of activity in the welding process, guarantees welding accuracy.

The invention discloses a welding combined type spiral bevel gear milling cutter and a welding tool, and relates to the technical field of welding. The milling cutter comprises a base, a connecting seat is welded to the top of the base, a milling cutter body is welded to the top of the connecting seat, a positioning device is arranged at the top of the base and comprises a first positioning groove, the inner wall of the first positioning groove is formed in the top of the base, and a second positioning groove is formed in the bottom of the connecting seat. A hollow positioning column is clamped to the inner wall of the first positioning groove. Through the arrangement of the positioning device, the first positioning groove, the second positioning groove and the hollow positioning column are matched, the connecting base and the milling cutter body are welded to the base through welding bonding points, the hollow positioning column is clamped into the first positioning groove, and then the second positioning groove of the connecting base is aligned to the hollow positioning column; therefore, the base can be accurately welded together, and local weaknesses or defects such as air connecting holes and cracks are avoided.

The invention relates to the technical field of precious metal alloy material manufacturing, in particular to a process for hardening treatment of gold through micro-nano metal powder, which comprises the steps of blank charging, smelting, vacuum ingot casting, surface cleaning, rolling stretching and age hardening, product surface treatment, product welding and the like. The method has the advantages that in the aspect of material selection, the micro-nano metal powder, such as titanium powder and cobalt powder, is diversified and is small in adding amount, various strengthening mechanisms can be provided, and the economical efficiency is guaranteed. The smelting process is accurate, good vacuum and temperature control is achieved, and stirring is uniform after micro-nano metal powder is added. And rapidly solidifying the cast ingot by using a water-cooling copper mold, treating the surface by using aqua regia and the like, and drying. Midway annealing can be executed through rolling and stretching, and the process is flexible. Product manufacturing processes are diversified, and surface treatment includes polishing, electroplating, coloring and the like. Advanced modes such as laser are adopted for welding to avoid hardness reduction. According to the process, the gold hardening treatment effect and quality are improved from multiple aspects, different requirements are met, and wide application prospects are achieved.

The invention discloses an automatic soldering machine and a soldering method thereof and relates to the field of soldering processing. The tin soldering method comprises the steps that for each welding spot of a workpiece to be subjected to tin soldering, a preset tin soldering task on the welding spot is obtained, the tin soldering task comprises tin soldering process parameters, and the tin soldering process parameters at least comprise the welding spot position, the welding temperature and the tin wire feeding mode; the current temperature of a soldering iron set unit is obtained through a soldering station system, and when the current temperature of the soldering iron set unit reaches the welding temperature of the welding spot, the soldering iron set unit is controlled to move to the position of the welding spot; and a tin wire feeding unit is controlled to provide tin wires for the welding spots according to the tin wire feeding mode, and the soldering station system heats a soldering iron set unit according to the welding temperature so as to complete welding of each welding spot of the workpiece to be subjected to tin soldering.

The invention relates to the technical field of laser welding, in particular to a high-speed copper wire welding method. Comprising the following steps: shaping a high-speed copper wire to be welded; assembling the shaped high-speed copper conductor on a copper terminal; and the position of the blue-light semiconductor continuous laser is adjusted, so that emitted blue-light laser is focused to the joint of the high-speed copper wire and the copper terminal, and the copper wire and the copper terminal are welded. The high-speed copper wire welding mode is simple, the blue laser is adopted for welding the high-speed copper wire, the absorptivity and the welding effect of the laser welding copper wire can be improved, many problems existing in existing laser welding copper wires are solved, and the high-speed copper wire welding method has great popularization value.

The utility model discloses a kind of welding piece clamping devices, including welding base, the bottom of welding base is distributed with at least three supporting legs, lifting assembly is provided on supporting leg, the output end of lifting assembly is connected with the bottom of welding base, at least one first chuck assembly, second chuck assembly and third chuck assembly are distributed and arranged on welding base, workpiece clamping area is formed between first chuck assembly, second chuck assembly and third chuck assembly, first chuck assembly, second chuck assembly and third chuck assembly are used to clamp positioning for different workpieces;Stable welding base using supporting leg, and its height is adjusted by lifting assembly, to adapt to welding equipment gap;When welding, welding base moves to welding equipment to facilitate welding;When unloading, welding base is lowered away from welding equipment, convenient to take piece;Work staff can adjust material taking space, reduce material taking difficulty;Workpiece is fixed using first chuck assembly, second chuck assembly and third chuck assembly, accurate welding is realized.

The application discloses a kind of vertical assembly construction methods of steel bifurcated pipe, comprising the following steps: one, the tile of steel bifurcated pipe and crescent rib plate are made;Two, pre-assembled platform is set and steel bifurcated pipe lofting is carried out;Three, pre-assembled steel bifurcated pipe;Four, steel bifurcated pipe inner support is set;Five, steel bifurcated pipe disassembly;Six, steel bifurcated pipe transportation after disassembly;Seven, steel bifurcated pipe is assembled again.The application is welded positioning block on the tile of steel bifurcated pipe by pre-assembled segment of steel bifurcated pipe, and vertical assembly method is used to assemble steel bifurcated pipe, so that steel bifurcated pipe assembly difficulty is reduced, crescent rib plate and each tile assembly positioning, adjustment is simple;Tile assembly process is single, and deformation is small, and assembly quality is higher, after assembly, high-difficulty welding such as a lot of vertical welding and overhead welding is reduced, effectively improve the steel bifurcated pipe weld quality and efficiency;Positioning is accurate and stable using positioning block, greatly reduce the bifurcated pipe assembly difficulty again.

This utility model discloses a flange welding positioner device, belonging to the technical field of flange welding auxiliary equipment, used for rapid and precise alignment welding of pipes and flanges. The device includes a connecting rod and baffles fixed at both ends. The inner diameter of the baffles matches the outer diameter of the pipe to be welded, and the two baffles are kept parallel and positioned by the connecting rod. Multiple sets of through holes are opened on the baffles, corresponding to the bolt holes of the flange. In use, the positioner is fitted onto the pipe, leaving a flange installation section. The flange is then bolted through the through holes and securely connected to the baffles, eliminating radial sliding and circumferential rotation of the flange during welding. After positioning, spot welding can be performed directly. The device can be reused after removal. This utility model achieves automatic coaxial positioning of the flange and pipe through a mechanical limiting structure, solving the problem of manual alignment deviation; it has the advantages of simple structure and reusability.

This utility model discloses a tabletop battery welding machine, including a main unit with a worktable on which welding fixtures are provided for fixing the welding rod and the battery motherboard; a laser welding system mounted on a lifting and adjusting mechanism fixedly mounted on the worktable; and a cooling system for cooling the laser welding system. This utility model significantly improves welding quality, reduces welding defects, and effectively lowers the failure rate by optimizing laser welding technology, thereby reducing battery scrapping and repair costs. This technology enhances welding efficiency, increases production speed, and improves process stability through high-voltage power supply control, making operation simpler and more widely applicable to various workpieces. It demonstrates significant progress and practical application value in the welding field, providing the industry with a high-quality, high-efficiency welding solution.

This invention provides an automatic copper busbar welding device for busbar trunking production, relating to the field of busbar trunking welding. The automatic copper busbar welding device for busbar trunking production includes two docking components. Each docking component includes a YZ axis assembly, a flipping assembly, a clamping platform, a drive assembly, a fixing assembly, and a preheating assembly. The flipping assembly is mounted on the YZ axis assembly and can automatically move along the Y and Z axes based on the YZ axis assembly. The clamping platform is mounted on the flipping assembly and can switch between horizontal and vertical 90-degree angles. The drive assembly, fixing assembly, and preheating assembly are all mounted on the clamping platform. This automatic copper busbar welding device for busbar trunking production, by setting up the drive assembly and fixing assembly, can clamp copper busbars specifically for busbar trunking. Even with thin copper busbars, drive transmission can be achieved. It is applicable to both long and short copper busbars. The fixing assembly can clamp the copper busbars, facilitating precise welding later.

The utility model discloses a seat framework welding tool which comprises a fixed bottom frame, a longitudinal limiting mechanism and a pressing and fixing mechanism, and a plurality of limiting lifting seats are arranged on the fixed bottom frame; the limiting lifting seat is suitable for bearing a main body frame; the two longitudinal limiting mechanisms are installed on the fixed bottom frame in a sliding mode, and the two longitudinal limiting mechanisms abut against the two longitudinal sides of the main body frame. The pressing and fixing mechanism is installed on the fixing bottom frame and the longitudinal limiting mechanism, and the pressing and fixing mechanism abuts against the upper surface of the main body frame. The seat framework can be accurately positioned, the operation process is simplified, and the working efficiency is improved.

The application relates to the technical field of automobile parts, and particularly discloses an automobile front door hinge reinforcing plate assembly and a vehicle; a first hinge reinforcing section is arranged on a first hinge sheet metal part, the first hinge reinforcing section is provided with a first positioning sunken groove, a first protruding part and a second protruding part, meanwhile, a second positioning sunken groove, a third protruding part and a fourth protruding part are arranged on the surface of the first reinforcing sheet metal part, the first reinforcing sheet metal part is completely bonded and welded with the first hinge reinforcing section, the welding is more firm, meanwhile, the first reinforcing sheet metal part is convenient to accurately weld during production, a second hinge reinforcing section is arranged on a second hinge sheet metal part, the second hinge reinforcing section is bonded and welded with a second reinforcing sheet metal part, and the side end surface of the second reinforcing sheet metal part abuts against the side end surface of the sunken groove; in this way, on the basis of the original sheet metal part structure and under the condition of lower manufacturing cost, the problem that the front door of an armored escort vehicle is prone to falling off due to the special modification and weight increase of the door is solved.

The utility model provides a kind of full-automatic mesh gantry weld, including rack, welding device, discharging mould frame, pushing device, feeding mould frame, mould plate and material moving device, first feeding way, second feeding way and door type frame are equipped on rack, welding device is vertically equipped on door type frame, mould plate is pushed to feeding mould frame by pushing device, material moving device is used to lift and move mould plate in feeding mould frame and place back to discharging mould frame.Through feeding mould frame moves to welding device and carries out welding processing to mesh placed in mould plate, after mesh welding is completed, through the material circulation function of material moving device, mould plate is lifted and moves and places back to discharging mould frame and carries out material taking and again discharging, realizes the full-automatic flow of mould plate between discharging mould frame and feeding mould frame, completely gets rid of the operation mode of traditional manual sequence welding, significantly improves the automation degree and production continuity of welding process, effectively improves production efficiency.

The application relates to a dispensing and welding device, equipment and method of a glass fiber filter, the device comprising a rotating mechanism for rotating around its axis to switch the glass fiber product in a feeding station, a dispensing station, a lamination positioning station and a welding station in sequence, a dispensing mechanism is arranged at the relative position of the dispensing station, the end face of one end of the glass fiber in the dispensing station is dispensed when switched to the dispensing station, the lamination positioning station is used for laminating the end faces of the two ends of the glass fiber through the web laminating mechanism when switched to the lamination positioning station, and the positioning of the packaging material is completed, a welding mechanism is arranged at the relative position of the welding station to simultaneously heat the two end faces of the packaging material to complete welding. Through the switching among the feeding station, the dispensing station, the lamination positioning station and the welding station in sequence, the automatic dispensing and precise lamination process of the end face of the glass fiber are realized.

This utility model discloses a welding positioning device for positioning a template to be welded. The angle of the projection of the welding end of the template along the Z direction onto a plane perpendicular to the Z direction is degrees. The device comprises: two first positioning supports arranged perpendicularly; and two second positioning supports arranged perpendicularly and separated from the first supports. Each second positioning support is parallel to a corresponding first positioning support, forming a placement space for the template to be welded between the second and first positioning supports, thereby enabling welding of the two templates at an included angle of degrees. This welding positioning device can limit the welding of two templates, ensuring welding accuracy.

The utility model relates to the technical field of welding machines for welding machining of connecting pieces, and discloses a welding machine for welding machining of a steel disassembly and assembly cabinet connecting piece, the welding machine comprises a base, a lifting table and the connecting piece, a fixing mechanism is arranged outside the lifting table, a welding mechanism is arranged inside the base, two clamping blocks are close to each other to clamp the connecting piece, and the connecting piece is welded to the lifting table. The two connecting pieces are clamped, a gear A rotates to drive a gear B to rotate, so that rotating welding can be conducted, the problem that the welding position is inaccurate due to manual position moving is solved, welding points of different heights can be welded through lifting of a lifting table, and welding is more stable and more accurate when a welding device is found for welding through the welding points; the sliding block slides to drive the welding device to be close to a welding point, welding can be conducted, flying dust generated during welding enters the filter box through the dust suction pipe and is discharged under filtration of the activated carbon filter plate, the personnel safety problem caused by flying dust floating is avoided, and the comfortable operation environment is guaranteed.

The utility model discloses a spring end welding jig, relates to spring production technical field, the spring end welding jig includes base, locating table and drive subassembly, base is equipped with mounting cavity, locating table is movably installed in mounting cavity, and the locating table and mounting cavity enclose to form locating ring slot, locating ring slot is used for placing spring, drive subassembly is equipped with drive subassembly, the drive subassembly is equipped with drive subassembly. The positioning table is provided with a friction abutting part protruding towards the positioning ring groove, the friction abutting part is used for abutting against one end of the spring, and the driving assembly is arranged on the base and connected with the positioning table; the driving assembly is used for driving the positioning table to rotate in the mounting cavity, so that one end of the spring is in butt joint with the other end of the spring. According to the technical scheme provided by the utility model, the problem that the head end and the tail end of the spring are butted manually and are difficult to be butted accurately in the existing welding process of the spring is solved.

The utility model discloses a tin soldering device for sensor assembly, which comprises a four-axis mechanical arm, a lifting assembly and a guide pipe, an angle adjusting assembly is mounted on the four-axis mechanical arm, the angle adjusting assembly is connected with a lifter, a welding gun is mounted at the lower end of the lifter, the lifting assembly is connected with the lifter, and the guide pipe is connected with the lifting assembly. An exhaust pipe is mounted on the lifting assembly, the guide pipe is connected with the lifting assembly, and a tin bar is inserted into the guide pipe; the four-axis mechanical arm can flexibly control the welding gun to move, the lifter finely adjusts the height of the welding gun, precise welding is achieved, the problems that production efficiency is low and the reject ratio of sensors is high are solved, the produced sensors are better in appearance and quality consistency, the exhaust pipe extracts smoke generated in the tin soldering process, the smoke is prevented from diffusing into the environment, air is kept fresh, and the production efficiency is improved. The operation comfort is improved, and the risk of soldering tin smoke is remarkably reduced.

The utility model discloses a welding clamping device used for an automobile ventilation pipe, which comprises a clamping device body used for positioning the ventilation pipe and a welding piece, the ventilation pipe comprises a connecting part, and the welding piece comprises a connecting piece, a first welding frame and a second welding frame. The clamping device body comprises a support used for supporting the connecting part, a first fixing arm, a second fixing arm, a first fixing assembly used for fixing the connecting piece, a second fixing assembly used for fixing the first welding frame and a third fixing assembly used for fixing the second welding frame, wherein the first fixing arm and the second fixing arm are used for fixing the connecting part to the support. The first fixing arm is used for fixing the end, connected with the connecting piece, of the connecting part, the second fixing arm is movably connected to the support in the axial direction of the connecting part, and the third fixing assembly is movably connected to the support in the radial direction of the connecting part. By means of automatic replacement of the clamping assemblies, similar connecting pieces can be welded in the same clamping device, the welding efficiency is improved, and the machining cost is reduced.