28results about How to "Uniform welding" patented technology

The invention discloses a manufacturing method of an LNG storage tank, the manufacturing method is used for manufacturing the LNG storage tank, the manufactured LNG storage tank comprises an inner lining layer and a shell layer, the outer side of the inner lining layer is coaxially sleeved with the shell layer, horn-shaped first through openings are formed in the axis positions of the two ends of the inner lining layer, and straight-barrel-shaped second through openings are formed in the axis positions of the two ends of the shell layer. According to the detachable and maintainable LNG storage tank, the shell layer and the lining layer which are separated are arranged and assembled with the mounting end and the reinforcing layer to form the detachable and maintainable LNG storage tank, and the problem that a gap exists between the lining and the shell layer, so that a combined structure is not firm is solved; the machining precision is improved in cooperation with welding equipment, the effect of facilitating assembly and later maintenance is achieved, the maintenance cost is greatly reduced, a protection structure is formed by a protection rod, an installation nut, a short shaft ring buckle and a cable piece, the structural connection strength of the shell layer is enhanced, the protection effect is provided, and the safety is greatly improved.

This utility model relates to the field of box manufacturing technology, and in particular to a finished box partition with precise positioning and easy welding. It includes a box body, within which a first partition and a second partition are provided. A pin plate is installed at one end of the second partition, which is slidably connected to the inner wall of the first partition. A pair of positioning protrusions corresponding to the inner wall of the box are respectively provided at one end of the first and second partitions. A pair of welding reinforcing ribs corresponding to the second partition are respectively installed on both sides of the other end of the first partition. A welding guide groove is formed between the welding reinforcing ribs and the second partition. This effectively solves the problems in the prior art where inaccurate partition positioning leads to welding position deviations, and improper welding may cause marks and damage to the inner surface of the box.

The embodiment of the invention provides vertical shaft steel pipe welding equipment. Relates to the technical field of penstock shaft construction. The outer side welding mechanism comprises an outer side rail, an outer side trolley and an outer side welding robot, the outer side trolley is arranged on the outer side rail and slides along the outer side rail, the outer side welding robot is arranged on the outer side trolley, and the outer side welding robot is used for welding an outer side welding seam of the steel pipe; the inner side welding mechanism comprises a telescopic frame, a hoisting frame, an inner side track, an inner side trolley and an inner side welding robot, the inner side track is arranged on the telescopic frame, the hoisting frame is connected with the telescopic frame, the inner side trolley is arranged on the inner side track and slides along the inner side track, and the inner side welding robot is arranged on the inner side trolley and slides along the inner side track. The inner side welding robot is used for welding inner side welding seams of the steel pipes; the hoisting mechanism is connected with the hoisting frame so as to drive the inner side welding mechanism to move in the vertical shaft in the axis direction of the vertical shaft. The equipment is used for achieving the effects of reducing construction risks and relieving the labor intensity of operators.

The utility model belongs to the technical field of elbow welding devices, and particularly relates to a large-diameter elbow welding device which comprises an equipment main frame, an angle adjusting fixing piece is fixedly installed in the middle of one end of the equipment main frame, and an elbow fixing adjusting plate is installed in the angle adjusting fixing piece in an up-down sliding mode. The other end of the bent pipe fixing and adjusting plate is installed in the equipment main frame in a left-right sliding mode, the bent pipe fixing and adjusting plate is in threaded connection to a first transmission screw, one end of the first transmission screw is rotationally connected to an angle adjusting and fixing piece, and the other end of the first transmission screw is rotationally installed on the equipment main frame. According to the large-caliber elbow welding device, angle adjustment of the elbow fixing and adjusting plate is cooperated with height adjustment of the elbow supporting piece, so that the large-caliber elbow welding device is adaptive to welding of large-caliber elbows with different angles, tools do not need to be replaced, and universality is high.

The application discloses a kind of iron component multi-station synchronous welding device, belong to workpiece welding technical field, this iron component multi-station synchronous welding device, including workbench, the bottom of the workbench is fixedly connected with bottom fixed shell, rotating drive mechanism is installed between the workbench and bottom fixed shell, the top of the workbench both sides are fixedly connected with a group of limit multi-section ring, the top rear end of the workbench is provided with alternate welding mechanism, the bottom of the workbench both sides are fixedly connected with limit component, the top of the workbench both sides are installed with feeding positioning mechanism.The two positioning plates in the rotating drive mechanism and the two workpiece feeding sleeves in the feeding positioning mechanism are designed in the application, so that the welding device has two welding stations, cooperates with the alternate welding mechanism, and the feeding of the other group of workpieces can be completed during the welding of one group of workpieces, which greatly improves the welding efficiency.

The application discloses a suspended ceiling profile calibration welding equipment and relates to the technical field of welding. The equipment comprises a welding mechanism, a feeding mechanism and a calibration mechanism. The welding mechanism and the feeding mechanism are installed on a rack. The welding mechanism, the feeding mechanism and the calibration mechanism are in electrical communication with a control system circuit. The calibration mechanism comprises a pair of traction assemblies and a calibration circuit. The pair of traction assemblies are symmetrically arranged in the rack. Each traction assembly comprises a steel cable, a winding machine and a support machine. The steel cable is connected between the winding machine and the support machine. The support machine is arranged outside the rack. The calibration circuit comprises a pair of sliding variable resistance elements. The pair of sliding variable resistance elements are respectively arranged in the pair of winding machines. The feeding mechanism and the welding mechanism work cooperatively to realize automatic feeding, positioning and peripheral welding. An operator only needs to simply control to complete a plurality of welding, thereby guaranteeing uniform and consistent welding seams, improving welding speed and product quality and being applicable to batch and on-site rapid construction requirements.

This invention discloses a welding device for a one-way explosion-proof valve body, comprising an adjustment component, a welding component, and a welding surface finishing component. The adjustment component is used to adjust the position of the welding surface finishing, and the welding component is used for adjusting and welding the valve body. The welding component includes a fixed plate fixedly mounted on the top of a fixed base and a first sliding rod fixedly mounted on the fixed plate. The welding surface finishing component is used to pre-treat the welding surface of the valve body at the position where it is welded to the flange. The welding surface finishing component includes a mounting plate, a transverse partition fixedly mounted on one side of the mounting plate, and side plates fixedly mounted on both sides of the transverse partition. This invention uses a rotating annular finishing strip to clean the welding surface of the valve body and the flange. The annular finishing strip fits tightly with the welding surface of the valve body, effectively removing oxide layers, oil stains, and impurities from the welding surface, improving the weld bonding strength, and avoiding affecting the subsequent assembly and sealing performance of the valve body.

This utility model relates to the field of I-beam wheel technology, specifically to a high-strength I-beam wheel. The steel plate used in this utility model is not thick, but it is sturdy, durable, economical, and practical. The wheel rim is rounded, and the reinforcing rib cavity has several raised cavities punched from the inside out. The end plate and the reinforcing rib cavity are uniformly welded by spot welding, saving time and providing sufficient strength. By utilizing several folded reinforcing ribs, the fatigue caused by direct stress on the end plate can be distributed.

The present application relates to the technical field of welding, in particular to a cobalt-based filler metal, a preparation method and application thereof, the chemical composition of the cobalt-based filler metal comprises Co: 50-70%, Cr: 5-15%, Ni: 6-15%, W: 3-4%, and Zr: 10-30% by mass percentage; the preparation steps comprise weighing the corresponding metal elements according to the above chemical composition, inductive smelting at a temperature of 1500-1600 DEG C, and powdering. The cobalt-based filler metal or the cobalt-based filler metal prepared by the above preparation method has excellent fluidity and wettability and low brittle phase formation tendency, has extremely strong versatility, and the use of the filler metal can obtain uniform welds and perfect filling, the high-temperature performance can meet the use requirements of active parts, and can be applied to repairing surface damage of cobalt-based material workpieces.

The embodiment of the present disclosure relates to the technical field of steel bar welding, and one embodiment of the present disclosure provides a steel bar butt welding equipment capable of achieving uniform welding, which comprises two left electrodes and two right electrodes, a butt welding frame, two electrode bearing parts and two steel bar conveying assemblies. The two electrode bearing parts are symmetrically arranged, each of the electrode bearing parts is provided with a left electrode and a right electrode, the right electrode can slide towards the left electrode, one of the electrode bearing parts is arranged on the butt welding frame, and the other electrode bearing part is arranged on the butt welding frame through an electrode position adjusting part. The two steel bar conveying assemblies are symmetrically arranged on the butt welding frame, and the electrode bearing parts are located between the two steel bar conveying assemblies. Through the above technical scheme, the steel bar butt welding equipment in the prior art is improved, the steel bar conveying precision and stability are improved during steel bar butt welding, and the problem that the steel bar welding efficiency is affected is solved.

The utility model provides a winding battery, a winding core is of a multi-layer structure formed by winding a pole piece and a diaphragm in a winding direction after being compounded, the pole piece comprises a coating area and tabs connected with the coating area, and the tabs form a first tab group and a second tab group when the pole piece is in a winding state; the tabs in the first tab group are arranged from the innermost layer to the outermost layer of the roll core in a pushing manner, and the tabs in the second tab group are arranged from the outermost layer to the innermost layer of the roll core in a pushing manner; in the first tab group, the heights of the tabs are gradually increased layer by layer from the outermost layer to the innermost layer of the roll core; and in the second tab group, the heights of the tabs are gradually reduced layer by layer from the outermost layer to the innermost layer of the roll core. The winding battery disclosed by the utility model can ensure that the inner layer of the winding core is welded with the tabs and the tabs on the inner and outer layers are uniformly welded, the effective welding number of the tabs is increased, the welding short-circuit rate is reduced, the rate capability of the battery can be improved, the temperature rise is reduced, the production yield can be improved, and the production and manufacturing cost is reduced.

The utility model relates to the technical field of filter element welding, in particular to a rotary type filter element end cover welding device which comprises a base, two first sliding grooves, two second sliding grooves, a first rotating shaft and a second rotating shaft. The first clamping mechanism comprises a first shell, the bottom face of the first shell is fixedly connected with the top face of the base, the top of the first shell is rotationally connected with a first rotating ring, the outer wall of the first rotating ring is fixedly sleeved with a first gear ring, and the interior of the first shell is rotationally connected with a first rotating rod and a second rotating rod. According to the end cover welding device, the first clamping mechanism, the second clamping mechanism, the welding mechanism and the inserting rod are arranged in a matched mode, so that two end covers can be welded at the same time, the shutdown operation time is shortened, a second rotating rod and a fourth rotating rod are connected through the inserting rod, and after a servo motor is started, a first rotating ring and a second rotating ring can synchronously rotate; and then the filter element and the end cover are driven to rotate at the same time, uniform welding of the welding head is facilitated, manual operation is reduced, and the welding efficiency is improved.

The invention discloses stable welding equipment for a fan bearing, which relates to the technical field of bearing welding and comprises a supporting seat, a connecting frame welded on the outer wall of the circumference of the supporting seat, a rotating frame, a bearing positioning table welded on the outer wall of the top of the rotating frame, a triangular centering clamping mechanism, an angle-adjustable welding gun mechanism and a rotating mechanism, the triangular centering clamping mechanism comprises a pressure sensor, a servo control assembly, three threaded rods, three transmission bevel gears and three positioning rods which are sequentially connected to the three threaded rods in a threaded mode. By arranging the triangular centering and clamping mechanism, the intelligent and automatic clamping effect is achieved, bearings of different specifications can be centered and clamped, the situation that the bearings move in the welding process can be effectively avoided, and the welding stability and the welding precision are improved; the welding angle of the laser welding gun can be flexibly adjusted, and the diversified requirements for multi-angle welding of different bearings can be met conveniently.

The utility model relates to welding frock technical field, concretely is a kind of stainless steel corrugated compensator cat ear welding frock, including round seat, circular block, supporting plate, placing mechanism and clamping mechanism, the circular block is set at the top of round seat, the supporting plate fixed sleeve is set in the outer wall of circular block, flange is sleeved on the circular block, placing mechanism and clamping mechanism are all set on round seat;The placing mechanism includes moving block, connecting rod, trapezoidal block and spring;The utility model positions cat ear by positioning rod preliminary positioning, spring, trapezoidal block and connecting rod cooperate and firmly hold, spring provides elasticity, ensure that cat ear does not shift when welding, compared with traditional sleeve positioning, this mode locks cat ear, makes welding point accurate, weld even, greatly improves welding precision and quality, reduces the rate of defective products, saves cost, enhances product reliability and market competitiveness.

This utility model discloses an auxiliary tooling for welding and positioning hanging nails on the water-cooled wall of a waste incinerator. It features a positioning component that serves as a vertical and horizontal reference. The positioning component has adaptable grooves that mate with protrusions on the water-cooled wall, and the gap between adjacent grooves fits snugly against the surface of a recessed area on the water-cooled wall. The positioning component also includes magnetic blocks that can magnetically connect to the water-cooled wall, with these magnetic blocks spaced apart from the adaptable grooves. This solves the problem in existing technologies where operators cannot quickly and stably weld hanging nails to the water-cooled wall for subsequent stable installation of hanging plates.

The invention relates to the technical field of circuit board welding, in particular to a small integrated welding machine. The small integrated welding machine comprises a first conveying device. The first protective cover is arranged on the upper side of the first conveying device; the welding device and the soldering flux spraying device are arranged on the moving module and located on the lower side of the first conveying device. The scaling powder spraying device comprises a scaling powder box and a spray head arranged in the scaling powder box; the spray head can spray soldering flux to the circuit board; the welding device comprises a tin furnace, a tin soldering head and a tin furnace box; the tin furnace box covers the tin furnace, and the tin soldering head is connected with the tin furnace. And the soldering tin is welded on a welding spot of the circuit board by the soldering tin head. The tin furnace melts soldering tin, the melted soldering tin is spot-welded on the circuit board by the soldering tin head, and the soldered soldering tin is uniform, neat in appearance and good in soldering quality. The welding device and the soldering flux spraying device are located on the lower side of the first conveying device, so that parts in the cabinet are very compact, and miniaturization of equipment is facilitated.

The application discloses a laser welding device for chain production and relates to the technical field of laser welding devices.The laser welding device comprises a base;the fixing seat, the mechanical arm, the heating nozzle and the flow guide cover are cooperated, so that the cooling speed of the welding seam is delayed, the welding seam quality and stability are improved, the functions of uniform heating of the welding seam and avoidance of cracking and peeling defects are realized;based on a heat transfer formula, the transmission temperature drop is calculated in real time, and the influences of multiple factors such as the length of the hose, the total heat transfer coefficient and the environment temperature are quantified;when the environment temperature changes beyond a threshold value, the gas flow rate is reversely calculated and adjusted, the heat loss is actively compensated, the outlet temperature of the heating nozzle is stabilized, the consistency of the preheating and the heat preservation of the welding seam is ensured, and the welding defects caused by temperature fluctuation are avoided;through image analysis, the positions of the welding seam and the heating nozzle are accurately determined, the actual distance between the two is calculated in combination with the camera parameters, the synchronous movement of the heating nozzle and the welding device and the collaborative control of the preheating before welding and the heat preservation after welding are realized.

The invention relates to the field of welding technology, and specifically to an electric connector electronic component welding device, comprising a workbench, wherein the upper end of the workbench is fixedly connected with a placement groove, the inner side of the placement groove is slidably connected with a circuit board, the inner side of the placement groove is fixedly connected with a rubber pad on the side that is in contact with the circuit board, the upper end of the circuit board is provided with a SOP16 package, the upper end of the workbench is fixedly connected with two groups of symmetrical mounting brackets, a welding mechanism is installed between the lower end of the mounting bracket and the workbench, and a cleaning mechanism is installed at the lower end of the workbench, and the welding head can perform fixed-point welding on the circuit board and the SOP16 package at one time through the mutual cooperation of the arc-surface convex block and the sliding connecting rod, which increases the accuracy compared with manual welding, avoids the damage of the melted tin bar to the circuit board through the fixed-point welding, saves the use of tin welding rods, saves production costs, and improves work efficiency.

The utility model relates to a hinge structure for an AE case, and belongs to the technical field of sheet metal case accessories. The hinge is composed of a hinge sleeve, a pressing rivet gasket and a hinge seat support assembly. Wherein the hinge sleeve is welded to the door plate through a cold extrusion forming technology, the pressing rivet gasket is integrated with the sealing gasket and the nut to improve the sealing performance, and the hinge base support achieves elastic positioning of the pin shaft through snap spring preassembling. According to the utility model, efficiency is improved by optimizing a welding mode, sealing is enhanced by a multi-stage anti-seepage structure, an assembling process is simplified by a pre-assembling process, and assembling precision is guaranteed by a pin shaft guiding design, so that not only are the strength and reliability of the hinge improved, but also the requirement of high IP grade is met, and the hinge is applicable to the field of sheet metal cases requiring high sealing performance and stable connection.

The invention discloses a mechanical automatic welding system, and relates to the field of mechanical automation, the mechanical automatic welding system comprises a tool plate, a supporting plate is arranged on the tool plate, a pair of feeding devices are symmetrically arranged on the supporting plate, each feeding device comprises a supporting bottom plate, a guide mounting plate is mounted on each supporting bottom plate, and a welding plate is mounted on each guide mounting plate. The supporting plate is provided with a pair of first guide grooves matched with the supporting bottom plate. In the welding preparation stage, an operator operates the jacking device to adjust the distance according to the size of a to-be-welded material, and a part is placed on the feeding conveying belt. The top pressing plate and the transmission shaft are driven by the first control motor and the second control motor, and the part is accurately pushed to the welding position. By means of precise feeding, the positioning deviation of a traditional mode is avoided, it is guaranteed that the initial welding position is accurate, weld joints are uniform and attractive, the product percent of pass is greatly increased, the rejection rate caused by poor welding is reduced, the cost is saved for enterprises, and the market competitiveness is enhanced.

The invention discloses a steel structure plate butt welding device and a working method thereof. The steel structure plate butt welding device comprises a bottom plate, a top plate and lateral supports on the two sides. A clamping assembly used for clamping a steel structure plate is arranged on the lateral support, the welding assembly comprises a welding gun, a motor, a third lead screw, a sliding block and an electric push rod, and front-back movement and height adjustment of the welding gun are achieved; the driving assembly comprises a gear, a rotating rod, a rotating disc and a rack, and vertical displacement of the clamping assembly is achieved through gear and rack transmission. A positioning device is further arranged on the rack, comprises a second lead screw and an internal thread knob and is used for finely adjusting and locking the position of the clamping assembly. Coarse adjustment is achieved through the driving assembly, fine adjustment is achieved through the positioning device, the tops of the two plates with different thicknesses are adjusted to the same horizontal plane, it is ensured that welding faces are aligned, the problems that in the prior art, the welding faces are uneven and the welding seam quality is poor due to the plate thickness difference are solved, and the beneficial effects of being convenient and fast to operate, high in welding precision and high in adaptability are achieved.

The utility model relates to the technical field of steel pipe welding, and discloses an adjustable welding table for welding steel pipes, which comprises a welding table, a double-head motor is fixedly mounted on the inner wall of the welding table, the output end of the double-head motor is fixedly connected with a rotating shaft, the outer wall of the rotating shaft is provided with a transmission mechanism, and the rotating shaft synchronously drives a rotating rod to rotate through the transmission mechanism. The end portions of the rotating rods are fixedly connected with rotating discs, the end portions of the rotating discs are fixedly connected with a set of supporting plates, the end portions of the supporting plates are fixedly connected with a base and a support, the top end of the support is rotationally connected with a rotating handle, the outer wall of the rotating handle is fixedly connected with a main gear, and the main gear is meshed with a set of auxiliary gears. The bottom ends of the auxiliary gears are fixedly connected with threaded rods, the bottom ends of the threaded rods are rotationally connected with the base, the threaded rods jointly penetrate through a supporting frame and are in threaded connection with the supporting frame, and the two sides of the bottom end of the supporting frame are fixedly connected with sliding blocks.

The application belongs to the technical field of cable welding, and discloses an automatic wire twisting and welding device for a cable head, which comprises a twisting and welding positioning seat, a layered wire twisting assembly is fixedly installed on the inner side of the twisting and welding positioning seat, guide assemblies are fixedly installed on the left side and the right side of the layered wire twisting assembly, a moving assembly is fixedly installed on the back of the two guide assemblies, a wire placing assembly is movably assembled on the top of the moving assembly, a lifting assembly is fixedly installed on the front side of the wire placing assembly, and a circular uniform welding assembly is fixedly installed on the front side of the lifting assembly. Through the circular uniform welding assembly and the rotatable wire placing assembly which cooperate with each other, the guide pipe can drive the welding wire to make circular motion around the wire butt joint, the welding head synchronously performs circular heating welding on the wire butt joint, uniform and stable conveying of the welding wire and circular synchronous welding are realized, the welding wire is accurately sent to the wire butt joint, circular and uniform welding of the wire butt joint is realized, welding defects such as blowhole, inclusion, crack and uneven weld are effectively avoided, and the welding quality is improved.

The invention discloses a tool bit base body assembling and welding machine for saw blade machining, and relates to the technical field of metal welding. A sliding table air cylinder is fixedly connected to the top of the bottom plate, a welding mechanism is fixedly installed on the surface of the sliding table air cylinder, a driving assembly is arranged on the side, away from the bottom plate, of the sliding table air cylinder, the two sides of a driving plate are fixedly connected with the sides, close to each other, of the sliding table air cylinder and the driving assembly correspondingly, and the driving plate is fixedly connected with the output end of the sliding table air cylinder. The fixing assembly is fixedly connected with the output end of the driving assembly, the welding assembly is fixedly connected with the side, close to the fixing assembly, of the sliding table air cylinder, the driving assembly is arranged, lifting and rotating of the base body can be completed, welding of all tool bits on the base body is achieved, continuous machining can be achieved, and collision of welded saw blades can be avoided; and the tool bit which is just welded is prevented from being bent and even fractured.

The invention discloses a movable pressure vessel transportation frame manufacturing device, and relates to the technical field of frame manufacturing, the movable pressure vessel transportation frame manufacturing device comprises a sliding block, the sliding block is slidably connected with a welding assembly, a fixing block is fixedly connected to the middle of the sliding block, the fixing block is an L-shaped plate, and a circular groove is formed in the side, close to the welding assembly, of the fixing block; a plurality of rolling wheels are rotationally connected into the circular groove, a V-shaped groove is formed in the middle of the outer side of each rolling wheel, and the multiple rolling wheels are arranged in the inclined direction of the edge of the fixing block. According to the movable pressure vessel transportation frame manufacturing device, welding wires are guided through the rolling wheels and clamped between the rolling wheels and the circular grooves, so that the welding wires can be accurately conveyed to the welding position in the preset direction, the swing range of the welding wires can be limited through close contact of the rolling wheels, the stability of the welding wires is kept, uniform and continuous welding seams can be formed easily, and the production efficiency is improved. And the defects of non-uniform welding seam width, undercut and the like are avoided.

The present invention discloses an automatic welding device for a street light pole and a base flange in the field of welding devices, comprising a clamping mechanism for fixing the base flange, a rod support mechanism is provided on the side opposite to the clamping mechanism, the rod support mechanism comprises at least one pair of movable brackets for horizontally supporting the street light pole, the movable bracket sends one end of the street light pole to the central hole of the base flange, a tube expansion mechanism is provided on the side opposite to one end of the street light pole, the tube expansion mechanism expands the opening of one end of the street light pole, an end tightening plate movable along the axial direction of the street light pole is provided at a position corresponding to the other end of the street light pole, and a welding robot is provided at a position corresponding to the base flange. The present invention can clamp and fix the base flange, ensure that there is no relative displacement between the street light pole and the base flange, automatically complete welding, have high welding precision, and save time and effort.

The present invention relates to the technical field of fin tube welding, and specifically to a fin welding assembly device for radiator production, including a frame, a bearing platform is provided on the frame, two first support seats are provided on the bearing platform; two positioning seats are provided on the frame, an annular track and two first clamping claws are provided on the positioning seat, and a welding assembly is provided on the annular track. The present invention matches the straight-line distance between the two ends of the U-shaped tube by relative sliding of the two first support seats, so that the equipment can be adjusted for different types of U-shaped tubes, thereby improving the adaptability of the equipment; the bearing platform can slide along the height direction of the frame to drive the two first clamping claws, so that the end axis of the U-shaped tube after being supported is coaxially arranged with the axis of the annular track, so that when the subsequent welding assembly rotates along the annular track, there is no need to adjust the position of the welding assembly, so that the welding assembly can evenly surround the end of the U-shaped tube to weld the fin tube and it.

The present application provides a copper-clad steel welding device, comprising a frame, a transport assembly and a welding mechanism, wherein the transport assembly is arranged on the frame, and the transport assembly is used to transport bar stock; the welding mechanism comprises a receiving ring seat, a rotating assembly, a telescopic assembly, a welding gun and an end clamping assembly; the receiving ring seat is connected to the frame, and the ends of two sections of bar stock are located in the receiving ring seat and abut against each other; the end clamping assembly is connected to the receiving ring seat, and the end clamping assembly clamps the end of the bar stock; the rotating assembly comprises a guide ring rail, a supporting base block and a rotating driving source, the guide ring rail is connected to the receiving ring seat, and the supporting base block is slidably connected to the guide ring rail; the telescopic assembly is connected to the supporting base block, and the welding gun is connected to the telescopic assembly, and the telescopic assembly drives the welding gun to move in a direction close to or away from the bar stock; the rotating driving source drives the supporting base block to slide along the inner wall of the guide ring rail, so that the welding gun welds the end of the bar stock in the circumferential direction. The present application can improve the uniformity of bar stock welding.