A welding joint impact rolling weld shaping device

Abstract

The present application discloses a device for shaping weld seams by impact rolling of welding joints, comprising a vibration and telescopic device and a main rolling wheel and an auxiliary rolling wheel arranged at the bottom of the vibration and telescopic device, wherein the main rolling wheel and the auxiliary rolling wheel are located on the same horizontal plane; the main rolling wheel comprises a cylindrical body and bowl-shaped bosses symmetrically arranged at both ends of the cylindrical body, a plurality of stamping convex patterns are evenly spaced along the circumference of the outer surface of the cylindrical body, and a first pin through hole is arranged in the center of the cylindrical body and the bowl-shaped boss; when the bowl-shaped boss moves toward the horizontal direction of the cylindrical body, the outer diameter of the bowl-shaped boss gradually decreases, and the outer diameter of the edge of the bowl-shaped boss away from the end of the cylindrical body is slightly larger than the outer diameter of the cylindrical body. The structure of the present application can improve the weld structure after welding, improve the welding quality of the welding joint and the weld, and thus extend the service life of the weldment. The device of the present application is easy to operate, has a simple structure, and can be automated with a control system to save manpower.

Description

Technical Field

[0001] The application relates to a device for shaping a weld seam by impact rolling during welding of a welded joint. Background Art

[0002] Welding is a basic process in engineering construction and a widely used engineering technology. However, welding joints and welds are often accompanied by some defects, and the organizational structure of some welding joints and welds is not satisfactory. For example, the weld pool of metals with poor heat dissipation crystallizes slowly, and generally may form a coarse grain organizational structure, and may also form segregation, thermal cracks, etc. Therefore, this patent design is proposed, which can be designed with different powers according to different needs and applied to different welding occasions to perform impact rolling and shaping of welds during welding to improve the quality of welds.

[0003] There are not many existing patent designs for impact rolling and shaping of welds during welding. Professor Fang Hongyuan, Wang Tao, Yang Jianguo and other teachers from Harbin Institute of Technology have designed a device for impact rolling and shaping welds of high-strength steel low-matching equal-load welding joints during welding, with patent number CN101890603A. This patented design uses an air hammer to provide power for impact rolling and shaping of welds during welding, and the surfaces of the front and rear rolling wheels are both smooth structures. The above patents have many advantages and overcome many shortcomings of traditional processes. However, at the same power, the air hammer equipment is large in size and occupies a large space. There are mutations when adjusting the hammer speed and frequency, which is not conducive to the operation of the equipment. Traditional weld improvement and shaping technologies are relatively simple, labor-intensive, and slightly inefficient. Summary of the invention

[0004] In order to solve the above-mentioned technical problems existing in the prior art, the purpose of the present application is to provide a device for shaping the weld seam of a welded joint by impact rolling during welding.

[0005] The device for shaping the weld seam of a welding joint by impact rolling during welding is characterized in that it includes a vibrating and telescopic device and a main rolling wheel and an auxiliary rolling wheel fixedly arranged at the bottom of the vibrating and telescopic device, the main rolling wheel and the auxiliary rolling wheel are located on the same horizontal plane; the main rolling wheel includes a cylindrical main body and bowl-shaped bosses symmetrically arranged at both ends of the cylindrical main body, the outer surface of the cylindrical main body is provided with a plurality of stamped convex grooves evenly spaced along the circumference, and a first pin through hole for installing an axle pin is arranged in the center of the cylindrical main body and the bowl-shaped boss; when the bowl-shaped boss moves toward the horizontal direction of the cylindrical main body, the outer diameter of the bowl-shaped boss gradually decreases, and the outer diameter of the edge of the bowl-shaped boss away from one end of the cylindrical main body is slightly larger than the outer diameter of the cylindrical main body; when the vibrating and telescopic device drives the main rolling wheel and the auxiliary rolling wheel to impact and shape the metal weld, the stamped convex grooves on the main rolling wheel cut and crush the large grains existing in the metal weld, and the auxiliary rolling wheel further rolls and hammers the metal weld to further improve the smoothness of the metal weld.

[0006] The device for shaping the weld seam by impact rolling during welding of a welding joint is characterized in that the stamping convex pattern is in a herringbone or V-shaped structure, and the raised edges of the stamping convex pattern are all ground and chamfered.

[0007] The device for shaping the weld seam of a welding joint by impact rolling during welding is characterized in that the auxiliary rolling wheel includes a cylindrical pressing wheel body and bowl-shaped pressing wheel bosses symmetrically arranged at both ends of the pressing wheel body, a second pin through hole for installing an axle pin is arranged in the center of the pressing wheel body and the pressing wheel boss; the outer diameter of the pressing wheel boss gradually decreases along the horizontal direction of the pressing wheel boss toward the pressing wheel body, and the outer diameter of the edge of the pressing wheel boss away from the pressing wheel body is slightly larger than the outer diameter of the pressing wheel body.

[0008] The device for shaping the weld seam of a welding joint by impact rolling is characterized in that the vibration and telescopic device comprises a hydraulic chamber, a T-shaped piston, a hydraulic pump, a high-pressure oil reservoir and a low-pressure oil reservoir. The upper end of the T-shaped piston is cooperatively arranged in the hydraulic chamber and divides the hydraulic chamber into an upper and a lower sub-chamber. An oil inlet and an oil outlet are respectively arranged on opposite sides of each sub-chamber. The lower end of the T-shaped piston passes through the bottom of the hydraulic chamber and is connected to the main rolling wheel and the auxiliary rolling wheel. The oil outlet pipe of the high-pressure oil reservoir is divided into two paths, one of which is connected to the upper sub-chamber of the hydraulic chamber through the first electromagnetic one-way valve. The oil inlet is connected by a pipeline, and the other is connected to the oil inlet of the lower sub-chamber of the hydraulic chamber by a pipeline through the second electromagnetic one-way valve; the oil inlet pipe of the low-pressure oil reservoir is divided into two routes, one is connected to the oil outlet of the upper sub-chamber of the hydraulic chamber by a pipeline through the third electromagnetic one-way valve, and the other is connected to the oil outlet of the lower sub-chamber of the hydraulic chamber by a pipeline through the fourth electromagnetic one-way valve; the oil outlet of the low-pressure oil reservoir is connected to the oil inlet of the high-pressure oil reservoir by a pipeline through the hydraulic pump, forming a hydraulic oil circuit circulation system; when the oil circulates, the oil pressure pushes the T-shaped piston to perform a cyclic reciprocating motion.

[0009] The device for shaping the weld seam of a welding joint by impact rolling is characterized in that an upper limit protrusion is provided on the top inner wall of the upper chamber, and the oil inlet and outlet on both sides of the upper chamber are at an equal distance from the top inner wall of the upper chamber and are slightly smaller than the distance from the bottom surface of the upper limit protrusion to the top inner wall of the upper chamber, so as to prevent the oil inlet and outlet on both sides of the upper chamber from being blocked during the upward pushing of the T-shaped piston.

[0010] The device for shaping the weld seam of a welding joint by impact rolling during welding is characterized in that a lower limit protrusion is provided on the bottom inner wall of the lower sub-chamber, and the oil inlet and the oil outlet on both sides of the lower sub-chamber are at an equal distance from the bottom inner wall of the lower sub-chamber, and are slightly smaller than the distance from the top surface of the lower limit protrusion to the bottom inner wall of the lower sub-chamber, so as to prevent the oil inlet and the oil outlet on both sides of the lower sub-chamber from being blocked during the downward pushing of the T-shaped piston.

[0011] The device for shaping weld seams by impact rolling during welding of welding joints is characterized in that a cylindrical hollow through hole is arranged at the center of the T-shaped piston, a central shaft rod which is adapted to the hollow through hole of the T-shaped piston is vertically fixed in the hydraulic chamber, and the T-shaped piston is fitted on the outside of the central shaft rod.

[0012] The device for shaping weld seam by impact rolling during welding of welding joints is characterized in that the outer diameter of the edge of the bowl-shaped boss away from one end of the cylindrical body is 0.5 to 3 mm larger than the outer diameter of the cylindrical body.

[0013] Compared with the prior art, the beneficial effects achieved by this application are:

[0014] The device can closely follow the welding equipment to process the high-temperature weld after welding, which can improve the weld structure to a certain extent, improve the welding quality of the welding joint and the weld, and thus extend the service life of the weld to a certain extent. The device is easy to operate, simple in structure, and can be automated with a control system to save manpower. In addition, the hydraulic drive, the speed of the hydraulic hammer can be adjusted steplessly, the frequency can be adjusted frequently, the mutation is small, and the noise is relatively small, which is conducive to the smooth operation of the welding impact shaping equipment and optimizes the working environment. The overall medium uses hydraulic oil, and the components of the equipment can be self-lubricated during operation, which is conducive to extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of this application;

[0016] Figure 2 This is a schematic diagram of the structure of the main rolling wheel of this application;

[0017] Figure 3 This is a schematic diagram of the structure of the vibration telescopic device of this application;

[0018] In the figure: 1-high-pressure oil reservoir, 2-hydraulic pump, 3-second electromagnetic one-way valve, 4-auxiliary rolling wheel, 5-main rolling wheel, 501-cylindrical body, 501a-stamping convex pattern, 502-bowl-shaped boss, 503-first pin through hole, 6-T-shaped piston, 7-fourth electromagnetic one-way valve, 8-third electromagnetic one-way valve, 9-low-pressure oil reservoir, 10-central shaft, 11-first electromagnetic one-way valve, 12-hydraulic chamber, 12a-upper sub-chamber, 12b-lower sub-chamber, 120-upper limit protrusion, 121-lower limit protrusion. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0020] Example: Control Figures 1 to 3

[0021] A welding joint impact rolling weld shaping device comprises a vibrating telescopic device and a main rolling wheel 5 and an auxiliary rolling wheel 4 fixedly arranged at the bottom of the vibrating telescopic device. The main rolling wheel 5 and the auxiliary rolling wheel 4 are located on the same horizontal plane.

[0022] The vibrating telescopic device includes a hydraulic chamber 12, a T-shaped piston 6, a hydraulic pump 2, a high-pressure oil reservoir 1, a low-pressure oil reservoir 9 and a central shaft 10, and the central shaft 10 is vertically fixed in the hydraulic chamber 12. A cylindrical hollow through hole matching the outer diameter of the central shaft 10 is arranged at the center of the T-shaped piston 6, and the T-shaped piston 6 is sleeved on the outside of the central shaft 10. The upper end of the T-shaped piston 6 is arranged in the hydraulic chamber 12 and divides the hydraulic chamber 12 into upper and lower sub-chambers, and each sub-chamber is provided with an oil inlet and an oil outlet on opposite sides; the lower end of the T-shaped piston 6 passes through the hydraulic chamber 12 and is connected to the main rolling wheel 5 and the auxiliary rolling wheel 4 through an axle pin. The way in which the lower end of the T-shaped piston 6 is connected to the main rolling wheel 5 and the auxiliary rolling wheel 4 can refer to Chinese patent CN101890603A.

[0023] The oil outlet pipe of the high-pressure oil reservoir 1 is divided into two paths, one of which is connected to the oil inlet of the upper chamber 12a of the hydraulic chamber 12 through the first electromagnetic one-way valve 11 by a pipeline, and the other is connected to the oil inlet of the lower chamber 12b of the hydraulic chamber 12 through the second electromagnetic one-way valve 3 by a pipeline.

[0024] The oil inlet pipe of the low-pressure oil reservoir 9 is divided into two paths, one of which is connected to the oil outlet of the upper sub-chamber 12a of the hydraulic chamber 12 through the third electromagnetic one-way valve 8, and the other is connected to the oil outlet of the lower sub-chamber 12b of the hydraulic chamber 12 through the fourth electromagnetic one-way valve 7. The oil outlet of the low-pressure oil reservoir 9 is connected to the oil inlet of the high-pressure oil reservoir 1 through the hydraulic pump 2, thereby forming a hydraulic oil circuit circulation system.

[0025] When oil enters the upper sub-chamber 12a of the hydraulic chamber 12, the first solenoid one-way valve 11 and the fourth solenoid one-way valve 7 are opened, and the second solenoid one-way valve 3 and the third solenoid one-way valve 8 are closed, so that the oil enters the upper sub-chamber 12a and pushes the T-shaped piston 6 downward. Under the downward pushing action of the T-shaped piston 6, the oil in the lower sub-chamber 12b enters the low-pressure oil reservoir 9 through the fourth solenoid one-way valve 7.

[0026] When the oil enters the lower sub-chamber 12b of the hydraulic chamber 12, the first solenoid one-way valve 11 and the fourth solenoid one-way valve 7 are closed, and the second solenoid one-way valve 3 and the third solenoid one-way valve 8 are opened, so that the oil enters the lower sub-chamber 12b and pushes the T-shaped piston 6 upward. Under the upward pushing action of the T-shaped piston 6, the oil in the lower sub-chamber 12b enters the low-pressure oil reservoir 9 through the third solenoid one-way valve 8.

[0027] The hydraulic pump 2 then pressurizes the oil in the low-pressure oil reservoir 9 and delivers it to the high-pressure oil reservoir 1, thereby forming a circulating flow of oil. The oil pressure pushes the T-shaped piston 6 to make a circular reciprocating motion, and finally drives the main rolling wheel 5 and the auxiliary rolling wheel 4 to vibrate. Through the above process, the automation of the vibration control system can be realized. In addition, the hydraulic drive and the pushing speed of the T-shaped piston 6 can be adjusted steplessly. By controlling the flow rate of the oil circulation and the frequency of the reciprocating motion of the T-shaped piston 6, the frequency can be adjusted frequently, with small mutations and relatively small noise. Secondly, because the oil in the hydraulic chamber 12 can play a certain role in shock absorption and buffering, when the lower end of the T-shaped piston 6 drives the main rolling wheel 5 and the auxiliary rolling wheel 4 to vibrate, the upper end of the T-shaped piston 6 moves smoothly in the hydraulic chamber 12, which is conducive to the overall smooth operation of the welding impact shaping equipment.

[0028] Comparison Figure 1 and Figure 3 An upper limit positioning protrusion 120 is provided on the top inner wall of the upper sub-chamber 12a, and the oil inlet and the oil outlet on both sides of the upper sub-chamber 12a are at an equal distance from the top inner wall of the upper sub-chamber 12a, and are slightly smaller than the distance between the bottom surface of the upper limit positioning protrusion 120 and the top inner wall of the upper sub-chamber 12a, so as to prevent the oil inlet and the oil outlet on both sides of the upper sub-chamber 12a from being blocked during the upward pushing of the T-shaped piston 6.

[0029] Comparison Figure 1 and Figure 3 A lower limit protrusion 121 is provided on the bottom inner wall of the lower sub-chamber 12b, and the oil inlet and the oil outlet on both sides of the lower sub-chamber 12b are at an equal distance from the bottom inner wall of the lower sub-chamber 12b, and are slightly smaller than the distance from the top surface of the lower limit protrusion 121 to the bottom inner wall of the lower sub-chamber 12b, so as to prevent the oil inlet and the oil outlet on both sides of the lower sub-chamber 12b from being blocked during the downward pushing of the T-shaped piston 6.

[0030] During the operation of the vibrating telescopic device of the present application, the action speed, force and frequency of the T-shaped piston 6 are adjusted by adjusting the switch and action time of the four electromagnetic one-way valves. The purpose of setting the upper limit projection 120 and the lower limit projection 121 in the hydraulic chamber 12 is to facilitate the control of the upper and lower vibration range of the T-shaped piston 6, and also to form two permanent sub-cavities in the hydraulic chamber 12. When the equipment is running, the sub-cavities are filled with oil for a long time, which is conducive to the timely response of the T-shaped piston 6 to the coordinated action of the four electromagnetic one-way valves.

[0031] Comparison Figure 2The main rolling wheel 5 includes a cylindrical body 501 and bowl-shaped bosses 502 symmetrically arranged at both ends of the cylindrical body 501. The outer surface of the cylindrical body 501 is evenly spaced along the circumference and a plurality of stamped convex grooves 501a are arranged. The shape of the stamped convex grooves 501a can be a herringbone or V-shaped structure. The raised edges of the stamped convex grooves 501a are all ground and chamfered, so that the raised edges of the stamped convex grooves 501a are relatively smooth. A first pin through hole 503 for installing an axle pin is arranged in the center of the cylindrical body 501 and the bowl-shaped boss 502. The main rolling wheel 5 is installed at the lower end of the T-shaped piston 6 by cooperating with the axle pin. The installation method can refer to Chinese patent CN101890603A.

[0032] When the bowl-shaped boss 502 is moved toward the horizontal direction of the cylindrical body 501, the outer diameter of the bowl-shaped boss 502 gradually decreases (refer to Figure 2 , the outer surface of the bowl-shaped boss 502 is a circular transition surface), the outer diameter of the edge of the bowl-shaped boss 502 away from the cylindrical body 501 is slightly larger than the outer diameter of the cylindrical body 501 (for example: 0.5~3mm larger than the outer diameter of the cylindrical body 501), the outer diameter of the intersection of the bowl-shaped boss 502 and the cylindrical body 501 is equal to the outer diameter of the cylindrical body 501, so that the transition outer diameter difference at both ends of the bowl-shaped boss 502 is relatively small, and the curvature of the outer surface of the bowl-shaped boss 502 is relatively gentle. According to different welding processes, different excess heights can control bowl-shaped bosses 502 with different transition outer diameter differences.

[0033] When the vibration expansion and contraction device is in operation and the T-shaped piston 6 vibrates, the main rolling wheel 5 and the auxiliary rolling wheel 4 also vibrate slightly. As the weldment moves, the friction between the two rolling wheels and the high-temperature weld causes the two rolling wheels to roll on the weld. When the main rolling wheel 5 passes through the weld, the high-temperature and plastic weld metal is shaped, and the weld part obtains the appropriate design excess height and width. The outer surface of the circular transition edge of the bowl-shaped boss 502 at both ends of the main rolling wheel 5 also squeezes and collects the weld metal from both sides to a certain extent, which reduces the adverse effects of the shrinkage of the weld metal after welding and reduces the probability of the formation of hot cracks in the weld.

[0034] The stamped convex pattern 501a on the surface of the cylindrical body 501 will be pressed into the high-temperature weld metal with good plasticity as the main rolling wheel rolls and vibrates. The stamped convex pattern 501a will "cut" and extrude the incompletely crystallized high-temperature weld in the depth direction, which is helpful to break up the possible dendrites and large-grained crystals and refine the grains. The raised edges of the stamped convex pattern 501a are ground and chamfered, and the weld toe position is smoothly transitioned, which ensures the "cutting" and extrusion effects without forming stress concentration. Then, the auxiliary rolling wheel 4 further processes the weld metal after the weld has been processed by the main rolling wheel 5, which still has a certain temperature and plasticity, to obtain a more ideal weld surface. The hammering action of the auxiliary rolling wheel 4 can release a certain welding residual stress. The combined action of the two rolling wheels makes the weld surface as smooth as possible and reduces possible surface microcracks.

[0035] The structure of the auxiliary rolling wheel 4 can be set according to the shape of the main rolling wheel 5, but its surface is no longer provided with stamped convex patterns. This is because the large-grained crystals at the metal weld position have been refined by the main rolling wheel 5. The function of the auxiliary rolling wheel 4 is to further impact and shape the weld that has been processed by the main rolling wheel 5. The surface of the auxiliary rolling wheel 4 needs to be designed to be a smooth surface to make the weld surface as flat and smooth as possible.

[0036] The contents described in this specification are merely an enumeration of implementation forms of the inventive concept, and the protection scope of the present invention should not be regarded as being limited to the specific forms described in the embodiments.

Claims

1. A device for shaping weld seams by impact rolling of welded joints, characterized in that The invention comprises a vibration and telescopic device and a main rolling wheel (5) and an auxiliary rolling wheel (4) fixedly arranged at the bottom of the vibration and telescopic device, wherein the main rolling wheel (5) and the auxiliary rolling wheel (4) are located on the same horizontal plane; the main rolling wheel (5) comprises a cylindrical body (501) and bowl-shaped bosses (502) symmetrically arranged at both ends of the cylindrical body (501); a plurality of stamped convex patterns (501a) are evenly spaced along the circumference of the outer surface of the cylindrical body (501); a first pin through hole (503) for mounting an axle pin is arranged at the center of the cylindrical body (501) and the bowl-shaped boss (502); a first pin through hole (503) for mounting an axle pin is arranged along the bowl-shaped boss When the boss (502) faces the horizontal direction of the cylindrical body (501), the outer diameter of the bowl-shaped boss (502) gradually decreases, and the outer diameter of the edge of the bowl-shaped boss (502) away from the cylindrical body (501) is slightly larger than the outer diameter of the cylindrical body (501); when the vibration telescopic device drives the main rolling wheel (5) and the auxiliary rolling wheel (4) to impact and shape the metal weld, the stamping convex pattern (501a) on the main rolling wheel (5) cuts and crushes the large grains existing in the metal weld, and the auxiliary rolling wheel (4) further rolls and hammers the metal weld to further improve the smoothness of the metal weld; The auxiliary rolling wheel (4) comprises a cylindrical rolling wheel body and bowl-shaped rolling wheel bosses symmetrically arranged at both ends of the rolling wheel body, a second pin through hole for installing an axle pin is arranged at the center of the rolling wheel body and the rolling wheel boss; the outer diameter of the rolling wheel boss gradually decreases along the horizontal direction of the rolling wheel boss toward the rolling wheel body, and the outer diameter of the edge of the rolling wheel boss away from the rolling wheel body is slightly larger than the outer diameter of the rolling wheel body; The vibrating telescopic device comprises a hydraulic chamber (12), a T-shaped piston (6), a hydraulic pump (2), a high-pressure oil reservoir (1) and a low-pressure oil reservoir (9); the upper end of the T-shaped piston (6) is arranged in the hydraulic chamber (12) and divides the hydraulic chamber (12) into an upper chamber and a lower chamber; each chamber is provided with an oil inlet and an oil outlet on opposite sides; the lower end of the T-shaped piston (6) passes through the bottom of the hydraulic chamber (12) and is connected to the main rolling wheel (5) and the auxiliary rolling wheel (4); The oil outlet pipe of the high-pressure oil reservoir (1) is divided into two routes, one route is connected to the oil inlet of the upper chamber (12a) of the hydraulic chamber (12) through a pipeline via a first electromagnetic one-way valve (11), and the other route is connected to the oil inlet of the lower chamber (12b) of the hydraulic chamber (12) through a pipeline via a second electromagnetic one-way valve (3); the oil inlet pipe of the low-pressure oil reservoir (9) is divided into two routes, one route is connected to the oil inlet of the lower chamber (12b) of the hydraulic chamber (12) through a third electromagnetic one-way valve (8). The oil outlet of the upper chamber (12a) of the hydraulic chamber (12) is connected by a pipeline, and the other oil outlet of the lower chamber (12b) of the hydraulic chamber (12) is connected by a pipeline through a fourth electromagnetic one-way valve (7); the oil outlet of the low-pressure oil reservoir (9) is connected by a pipeline to the oil inlet of the high-pressure oil reservoir (1) through a hydraulic pump (2), thereby forming a hydraulic oil circulation system; when the oil circulates, the oil pressure pushes the T-shaped piston (6) to perform a cyclic reciprocating motion; An upper limit convex block (120) is provided on the top inner wall of the upper chamber (12a); the oil inlet and the oil outlet on both sides of the upper chamber (12a) are at an equal distance from the top inner wall of the upper chamber (12a), and are slightly smaller than the distance between the bottom surface of the upper limit convex block (120) and the top inner wall of the upper chamber (12a), so as to prevent the oil inlet and the oil outlet on both sides of the upper chamber (12a) from being blocked during the process of the T-shaped piston (6) being pushed upward; A lower limit convex block (121) is provided on the bottom inner wall of the lower sub-chamber (12b); the oil inlet and the oil outlet on both sides of the lower sub-chamber (12b) are at an equal distance from the bottom inner wall of the lower sub-chamber (12b), and are slightly smaller than the distance between the top surface of the lower limit convex block (121) and the bottom inner wall of the lower sub-chamber (12b), so as to prevent the oil inlet and the oil outlet on both sides of the lower sub-chamber (12b) from being blocked during the process of pushing the T-shaped piston (6) downward.

2. The device for shaping weld seams by impact rolling of welded joints according to claim 1 is characterized in that The stamped convex pattern (501a) is in a herringbone or V-shaped structure, and the raised edges of the stamped convex pattern (501a) are all ground and chamfered.

3. The device for shaping weld seams by impact rolling during welding of welding joints according to claim 1 is characterized in that A cylindrical hollow through hole is arranged at the center of the T-shaped piston (6), a central shaft (10) adapted to the hollow through hole of the T-shaped piston (6) is vertically fixedly arranged in the hydraulic chamber (12), and the T-shaped piston (6) is sleeved on the outside of the central shaft (10).

4. The device for shaping weld seams by impact rolling during welding of a welded joint according to claim 1 is characterized in that The outer diameter of the edge of the bowl-shaped boss (502) away from one end of the cylindrical body (501) is 0.5 to 3 mm larger than the outer diameter of the cylindrical body (501).

Images