Cylinder section end face welding shape maintaining method

Abstract

The invention provides a cylinder section end face welding shape maintaining method which comprises the following steps that S1, shape maintaining devices are installed, specifically, a front welding face shape maintaining device, a lower cylinder section shape maintaining device and an upper cylinder section shape maintaining device are installed at the front end and the rear end of a cylinder section assembly, the current posture of the cylinder section assembly is fixed and kept, and the cylinder section assembly comprises an upper cylinder section and a lower cylinder section; the bottom end of a welding face clamp is installed on a workbench, the upper portion of the clamp is driven by a bottom rotary table to rotate to the welding face of the barrel section assembly, and the welding face of the barrel section assembly is clamped; and S3, welding operation is executed, specifically, a welding path is planned for a welding operation table, and the welding operation table is controlled to execute welding operation. By designing the shape maintaining device and the clamp matched with the structural characteristics of the cylinder section assembly, the influence of factors such as workpiece dislocation and thermal stress on the welding process is reduced, and welding defects are reduced.

Description

Technical Field

[0001] The invention relates to the field of shape preservation and welding of barrel sections, and in particular to a shape preservation method for barrel section end face welding. Background Art

[0002] In contemporary industrial production, the cylinder is one of the common workpieces in the welding field. Cylindrical workpieces are generally large in size and weight, and they need to be effectively supported during the welding process. The current common cylinder welding is generally circumferential welding or straight seam welding for a single cylinder segment, and there is a lack of welding solutions for multiple cylinder segments. In addition, the welding process conditions are harsh, and the products of the welding process are very harmful to the human body. It is of great significance to improve the degree of automation of the welding process. Prior art, such as the patent document with publication number CN105451930A, discloses a support device for the manufacture of cylindrical containers, which fails to achieve automatic welding of cylinder segments and cannot avoid harm to the human body. Summary of the invention

[0003] In view of the defects in the prior art, the object of the present invention is to provide a method for welding the end face of a cylinder segment in a shape-preserving manner.

[0004] A method for welding a barrel end surface in a shape-preserving manner according to the present invention comprises the following steps:

[0005] Step S1, installing the shape-keeping device: installing the front welding surface shape-keeping device, the lower barrel section shape-keeping device, and the upper barrel section shape-keeping device to the front and rear ends of the barrel section assembly to fix and maintain the current posture of the barrel section assembly, wherein the barrel section assembly includes two layers of barrel sections, the upper and the lower layers;

[0006] Step S2, welding fixture clamping: the bottom end of the welding surface fixture is mounted on the workbench, and the upper part of the fixture is driven by the bottom turntable to rotate to the welding surface of the barrel section assembly to clamp the welding surface of the barrel section assembly;

[0007] Step S3, welding operation execution: planning a welding path for the welding operation station, and controlling the welding operation station to execute the welding operation.

[0008] Preferably, steps S1-S3 include the following structures: a front welding surface shape-keeping device, a lower barrel section shape-keeping device, an upper barrel section shape-keeping device, a welding surface fixture, and a welding operation table;

[0009] A front welding surface shape retaining device and a lower barrel section shape retaining device are installed at both ends of the side surface of the workbench, a welding surface clamp is arranged at the front welding surface shape retaining device, an upper barrel section shape retaining device is arranged above the lower barrel section shape retaining device, and welding operating tables are arranged on the front and rear sides of the welding surface clamp.

[0010] Preferably, the lower barrel section shape-keeping device comprises: a lower shape-keeping roller frame support seat and a lower shape-keeping roller frame;

[0011] The lower profile-retaining roller frame support seat is installed on the workbench, the lower profile-retaining roller frame is installed on the lower profile-retaining roller frame support seat, and the lower profile-retaining roller frame is installed with left and right groups of rollers, each of which is installed on a roller support, and the bottom of the roller support is connected to the bottom support. The rotation of the left and right roller supports can drive the adjustment of the inclination angles of the left and right groups of rollers, thereby adjusting the posture of the roller when it contacts the barrel section during work.

[0012] Preferably, the upper barrel section shape-keeping device comprises: a lower shape-keeping frame support, a lower shape-keeping support frame, an upper shape-keeping support frame and an upper shape-keeping roller frame;

[0013] The lower profile retaining frame pillar is installed on the workbench, the lower profile retaining support frame is installed on the lower profile retaining frame pillar, the upper profile retaining support frame and the upper profile retaining roller frame are installed on the lower profile retaining support frame, and the upper profile retaining roller frame is located at the inner side of the bottom of the upper profile retaining support frame.

[0014] Preferably, the shape of the lower profile-retaining support frame facing the workbench side is adapted to the shape of the lower barrel section, and the shape of the upper profile-retaining support frame facing the workbench side is adapted to the shape of the upper barrel section. The upper profile-retaining roller frame is provided with left and right groups of rollers, and the two groups of rollers are respectively installed on roller supports. The bottom of the roller support is connected to the bottom support. The rotation of the left and right roller supports can drive the adjustment of the inclination angles of the left and right groups of rollers, thereby adjusting the posture of the rollers when they contact the barrel section during work.

[0015] Preferably, the welding surface fixture comprises: a fixture frame and a rotary clamping support cylinder;

[0016] The clamp frame is installed on the workbench, and the clamp frame is arranged as a square frame structure. A plurality of inwardly telescopic rotating clamping support cylinders are distributed on the periphery of the clamp frame. The rotating clamping support cylinder comprises a fixed part and a rotating clamping part. The fixed part is installed on the clamp frame, and the rotating clamping part is connected to the outside of the fixed part. The rotating clamping part can be clamped by rotating 90° toward the direction close to the barrel section, and can be loosened by rotating 90° in the opposite direction.

[0017] Preferably, the welding operation table comprises: a front welding surface welding operation table and a rear welding surface welding operation table;

[0018] The front welding surface welding operation table and the rear welding surface welding operation table are located on both sides of the welding surface fixture, the front welding surface welding operation table can be movably placed on a horizontal ground, and the rear welding surface welding operation table is installed on a workbench;

[0019] The front welding surface welding operation platform and the rear welding surface welding operation platform are both arranged on a mechanical arm installation lifting platform, and the mechanical arm adjusts its height through the lifting platform.

[0020] Preferably, step S1 further comprises the following steps:

[0021] Step A1, installation of the front welding surface shape retaining device: install four front welding surface shape retaining devices below the barrel segment assembly welding surface, one at each of the left and right ends below the welding surface of each barrel segment in the lower layer, and the installation positions on the barrel segment assembly welding surface are symmetrical about the center of the barrel segment assembly.

[0022] Step A2, installation of the lower barrel section shape-keeping device: install two lower shape-keeping roller frame support seats on the bottom workbench, install the two lower shape-keeping roller frames on one lower shape-keeping roller frame support seat respectively, and adjust the rotation angle of the roller support on the lower shape-keeping roller frame so that the rollers of the lower shape-keeping roller frame are in close contact with the outer walls of the two lower connected barrel sections;

[0023] Step A3, installation of the upper barrel section shape-preserving device: after the two lower coupled barrel sections have completed shape preservation, the two lower shape-preserving frame pillars are symmetrically installed to the outside of the lower coupled barrel section, a lower shape-preserving support frame is installed on the upper end of the lower shape-preserving frame pillars, the lower arc of the lower shape-preserving support frame is tightly fitted with the outer wall of the lower coupled barrel section, an upper shape-preserving roller frame is installed on the lower shape-preserving support frame, the rotation angle of the roller support on the upper shape-preserving roller frame is adjusted to make the roller in close contact with the outer wall of the two upper coupled barrel sections, an upper shape-preserving support frame is installed on the lower shape-preserving support frame, the lower arc of the upper shape-preserving support frame is tightly fitted with the outer wall of the upper coupled barrel section.

[0024] Preferably, step S2 further comprises the following steps:

[0025] Step B1, fixture rotation: the welding surface fixture is initially installed on both sides of the welding work area, the extension surface of the welding surface fixture in the initial posture is not coplanar with the extension surface of the working posture, and the welding surface fixture rotates from the initial posture to the working posture during operation;

[0026] Step B2, fixture positioning: the welding surface fixture is adjusted until all the rotating clamping support cylinders on the fixture frame of the welding surface fixture are in the effective working position, at which time the axis of the fixed part of the rotating clamping support cylinder is perpendicular to the end face of the barrel section, the rotating clamping part is outside the end face of the barrel section, and the end face of the barrel section is within the clamping working range of the rotating part;

[0027] Step B3, clamping the fixture: all the rotary clamping support cylinders on the welding surface fixture are rotated and tightened, and the ends of the rotary clamping support cylinders are crimped onto the welding surface.

[0028] Preferably, step S3 further comprises the following steps:

[0029] Step C1, positioning the welding operation table: the welding operation table is moved to the vicinity of the welding surface of the barrel assembly, and the position of the welding operation table is finely adjusted so that the end of the mechanical arm of the welding operation table is aligned with the point to be welded;

[0030] Step C2, welding path planning: teaching the welding path of the welding operation table robot arm through the teaching pendant;

[0031] Step C3, welding process execution: write the control program of the welding operation table, control the mechanical arms of the front and rear welding operation tables to link with the lifting platform of the corresponding welding operation table to achieve full coverage of the welding path, and control the welding process of the welding operation table to proceed synchronously.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. This application reduces the influence of workpiece misalignment, thermal stress and other factors on the welding process and reduces welding defects by designing a shape-preserving device and a fixture that are adapted to the structural characteristics of the barrel section assembly.

[0034] 2. The welding solution of this application using a robot and a lifting platform in collaboration is of great significance for improving the degree of automation of the welding process and increasing the welding rate.

[0035] 3. This application can clamp and weld multiple barrel sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0037] Figure 1 It is a schematic diagram of the overall structure of the device using the method of maintaining the shape of the end face of the barrel;

[0038] Figure 2 It is a schematic diagram of the welding surface fixture structure;

[0039] Figure 3 Provide a flow chart for welding the barrel section assembly to maintain shape;

[0040] Figure 4 This is a schematic diagram of the welding shape-preserving process of the barrel section assembly;

[0041] As shown in the figure:

[0042] DETAILED DESCRIPTION

[0043] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0044] like Figure 1-2 As shown, this embodiment includes: a front welding surface shape retaining device 1, a lower barrel section shape retaining device 2, an upper barrel section shape retaining device 3, a welding surface clamp 4 and a welding operating table 5; the front welding surface shape retaining device 1 and the lower barrel section shape retaining device 2 are installed at both ends of the side surface of the workbench, the welding surface clamp 4 is arranged at the front welding surface shape retaining device 1, the upper barrel section shape retaining device 3 is arranged above the lower barrel section shape retaining device 2, and the welding operating table 5 is arranged on the front and rear sides of the welding surface clamp 4.

[0045] The lower barrel section shape-keeping device 2 comprises: a lower shape-keeping roller frame support seat 21 and a lower shape-keeping roller frame 22; the lower shape-keeping roller frame support seat 21 is installed on the workbench, the lower shape-keeping roller frame 22 is installed on the lower shape-keeping roller frame support seat 21, and rollers are arranged on the lower shape-keeping roller frame 22. The upper barrel section shape-keeping device 3 comprises: a lower shape-keeping frame pillar 31, a lower shape-keeping support frame 32, an upper shape-keeping support frame 33 and an upper shape-keeping roller frame 34; the lower shape-keeping frame pillar 31 is installed on the workbench, the lower shape-keeping support frame 32 is installed on the lower shape-keeping frame pillar 31, the upper shape-keeping support frame 33 and the upper shape-keeping roller frame 34 are installed on the lower shape-keeping support frame 32, and the upper shape-keeping roller frame 34 is located at the inner side of the bottom of the upper shape-keeping support frame 33. The shape of the lower profile support frame 32 facing the workbench is adapted to the shape of the lower barrel section, the shape of the upper profile support frame 33 facing the workbench is adapted to the shape of the upper barrel section, and the upper profile roller frame 34 is provided with rollers. The welding surface fixture 4 includes: a fixture frame 41 and a rotary clamping support cylinder 42; the fixture frame 41 is installed on the workbench, the fixture frame 41 is set as a square frame structure, and a plurality of rotary clamping support cylinders 42 extending inward are distributed on the periphery of the fixture frame 41. The welding operation table 5 includes: a front welding surface welding operation table 51 and a rear welding surface welding operation table 52; the front welding surface welding operation table 51 and the rear welding surface welding operation table 52 are located on both sides of the welding surface fixture 4, the front welding surface welding operation table 51 can be movably placed on a horizontal ground, and the rear welding surface welding operation table 52 is installed on the workbench; the front welding surface welding operation table 51 and the rear welding surface welding operation table 52 are both set on a mechanical arm installation lifting platform, and the mechanical arm adjusts the height through the lifting platform.

[0046] like Figure 3 As shown, the welding shape-keeping method using the above-mentioned device in this embodiment includes the following steps: Step S1, shape-keeping device installation: install the front welding surface shape-keeping device 1, the lower barrel segment shape-keeping device 2, and the upper barrel segment shape-keeping device 3 to the front and rear end positions of the barrel segment assembly to fix and maintain the current posture of the barrel segment assembly, and the barrel segment assembly includes an upper and lower barrel segment; Step S2, welding fixture clamping: rotate the welding surface fixture 4 to the welding surface of the barrel segment assembly to clamp the welding surface of the barrel segment assembly; Step S3, welding operation execution: plan the welding path for the welding operating table 5, and control the welding operating table 5 to execute the welding operation.

[0047] Step S1 also includes the following steps: Step A1, installation of the front welding surface shape-retaining device 1: install four front welding surface shape-retaining devices 1 below the welding surface of the barrel section assembly, install one at each of the left and right ends below the welding surface of each barrel section of the lower layer, and the installation positions on the welding surface of the barrel section assembly are symmetrical about the center of the barrel section assembly. Step A2, installation of the lower barrel section shape-retaining device 2: install two lower shape-retaining roller frame support seats 21 on the bottom workbench, install two lower shape-retaining roller frames 22 on one lower shape-retaining roller frame support seat 21 respectively, adjust the rotation angle of the roller support on the lower shape-retaining roller frame 22, so that the rollers of the lower shape-retaining roller frame 22 are in close contact with the outer wall of the lower barrel section; Step A3, installation of the upper barrel section shape-retaining device 3: symmetrically install the two lower shape-retaining frame pillars 31 to the lower layer of the combined barrel section. On the outside of the lower shape-retaining frame 32, a lower shape-retaining support frame 32 is installed on the upper end of the lower shape-retaining support frame pillar 31, and the arc below the lower shape-retaining support frame 32 is tightly fitted with the outer wall of the lower layer of the combined barrel section; an upper shape-retaining roller frame 34 is installed on the lower shape-retaining support frame 32, and the rotation angle of the roller support on the upper shape-retaining roller frame 34 is adjusted to make the roller in close contact with the outer wall of the barrel section; an upper shape-retaining support frame 33 is installed on the lower shape-retaining support frame 32, and the arc below the upper shape-retaining support frame 33 is tightly fitted with the outer wall of the upper layer of the combined barrel section.

[0048] Step S2 also includes the following steps: Step B1, fixture rotation: the welding surface fixture 4 is initially installed on both sides of the welding work area, and the extension surface of the initial posture of the welding surface fixture 4 is not coplanar with the extension surface of the working posture. During operation, the welding surface fixture 4 rotates from the initial posture to the working posture; Step B2, fixture positioning: the welding surface fixture 4 adjusts its position until all the rotating clamping support cylinders 42 on the fixture frame 41 of the welding surface fixture 4 are in an effective working position; Step B3, fixture clamping: all the rotating clamping support cylinders 42 on the welding surface fixture 4 are rotated and tightened, and the ends of the rotating clamping support cylinders 42 are crimped onto the welding surface.

[0049] Step S3 also includes the following steps: Step C1, positioning the welding operation platform 5: transporting the welding operation platform 5 to the vicinity of the welding surface of the barrel section assembly, and fine-tuning the position of the welding operation platform 5 so that the end of the mechanical arm of the welding operation platform 5 is aligned with the point to be welded; Step C2, welding path planning: teaching the welding path of the mechanical arm of the welding operation platform 5 through the teaching pendant, which is a handheld device for manual robot operation, program writing, parameter configuration and monitoring; Step C3, welding process execution: writing a control program for the welding operation platform 5, controlling the mechanical arms of the front and rear welding operation platforms 5 to be linked with the lifting platform of the corresponding welding operation platform 5 to achieve full coverage of the welding path, and controlling the welding process of the welding operation platform 5 to proceed synchronously.

[0050] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for welding a barrel end surface in a shape-preserving manner, characterized in that: The following steps are involved: Step S1, installing the shape retaining device: installing the front welding surface shape retaining device (1), the lower barrel section shape retaining device (2), and the upper barrel section shape retaining device (3) at the front and rear ends of the barrel section assembly to fix and maintain the current posture of the barrel section assembly, wherein the barrel section assembly includes two layers of barrel sections, the upper and the lower layers; Step S2, welding fixture clamping: the bottom end of the welding surface fixture (4) is mounted on the workbench, and the upper part of the fixture is driven by the bottom turntable to rotate to the welding surface of the barrel section assembly to clamp the welding surface of the barrel section assembly; Step S3, welding operation execution: planning a welding path for the welding operation station (5), and controlling the welding operation station (5) to execute the welding operation.

2. The method for welding the barrel end surface according to claim 1, characterized in that: Steps S1-S3 include the following structures: a front welding surface shape-keeping device (1), a lower barrel section shape-keeping device (2), an upper barrel section shape-keeping device (3), a welding surface fixture (4) and a welding operation table (5); A front welding surface shape retaining device (1) and a lower barrel section shape retaining device (2) are installed at both ends of the side surface of the workbench, a welding surface clamp (4) is arranged at the front welding surface shape retaining device (1), an upper barrel section shape retaining device (3) is arranged above the lower barrel section shape retaining device (2), and a welding operating table (5) is arranged at the front and rear sides of the welding surface clamp (4).

3. The method for maintaining the shape of the barrel end surface welding according to claim 2 is characterized in that: The lower barrel section shape-keeping device (2) comprises: a lower shape-keeping roller frame support seat (21) and a lower shape-keeping roller frame (22); The lower profile-retaining roller frame support seat (21) is installed on the workbench, and the lower profile-retaining roller frame (22) is installed on the lower profile-retaining roller frame support seat (21). The lower profile-retaining roller frame (22) is provided with left and right groups of rollers, and the two groups of rollers are respectively installed on roller supports. The bottom of the roller supports is connected to the bottom support. The rotation of the left and right roller supports can drive the adjustment of the inclination angles of the left and right groups of rollers, thereby adjusting the posture of the rollers when they are in contact with the barrel section during work.

4. The method for welding the barrel end surface according to claim 2, characterized in that: The upper cylinder section shape-keeping device (3) comprises: a lower shape-keeping frame support (31), a lower shape-keeping support frame (32), an upper shape-keeping support frame (33) and an upper shape-keeping roller frame (34); The lower profile-keeping frame pillar (31) is installed on a workbench, the lower profile-keeping support frame (32) is installed on the lower profile-keeping frame pillar (31), the upper profile-keeping support frame (33) and the upper profile-keeping roller frame (34) are installed on the lower profile-keeping support frame (32), and the upper profile-keeping roller frame (34) is located at the inner side of the bottom of the upper profile-keeping support frame (33).

5. The method for maintaining the shape of the barrel end surface welding according to claim 4 is characterized in that: The shape of the lower profile-retaining support frame (32) facing the workbench is adapted to the shape of the lower barrel section, and the shape of the upper profile-retaining support frame (33) facing the workbench is adapted to the shape of the upper barrel section. The upper profile-retaining roller frame (34) is provided with left and right groups of rollers, each of which is mounted on a roller support. The bottom of the roller support is connected to the bottom support. The rotation of the left and right roller supports can drive the adjustment of the inclination angles of the left and right groups of rollers, thereby adjusting the posture of the rollers when they are in contact with the barrel section during work.

6. The method for maintaining the shape of the barrel end surface welding according to claim 2, characterized in that: The welding surface fixture (4) comprises: a fixture frame (41) and a rotary clamping support cylinder (42); The clamp frame (41) is installed on a workbench. The clamp frame (41) is set as a square frame structure. A plurality of inwardly telescopic rotating clamping support cylinders (42) are distributed around the periphery of the clamp frame (41). The rotating clamping support cylinder (42) comprises a fixed part and a rotating clamping part. The fixed part is installed on the clamp frame (41). The rotating clamping part is connected to the outside of the fixed part. The rotating clamping part can be rotated 90° in the direction close to the barrel section to achieve clamping, and can be rotated 90° in the opposite direction to achieve loosening.

7. The method for maintaining the shape of the barrel end surface welding according to claim 2, characterized in that: The welding operation table (5) comprises: a front welding surface welding operation table (51) and a rear welding surface welding operation table (52); The front welding surface welding operation table (51) and the rear welding surface welding operation table (52) are located on both sides of the welding surface fixture (4); the front welding surface welding operation table (51) can be movably placed on a horizontal ground, and the rear welding surface welding operation table (52) is installed on a workbench; The front welding surface welding operation platform (51) and the rear welding surface welding operation platform (52) are both arranged on a mechanical arm installation lifting platform, and the height of the mechanical arm is adjusted by the lifting platform.

8. The method for maintaining the shape of the barrel end surface welding according to claim 1, characterized in that: Step S1 also includes the following steps: Step A1, installation of the front welding surface shape retaining device (1): four front welding surface shape retaining devices (1) are installed below the welding surface of the barrel segment assembly, one is installed at each of the left and right ends below the welding surface of each barrel segment in the lower layer, and the installation positions on the welding surface of the barrel segment assembly are symmetrical about the center of the barrel segment assembly. Step A2, installation of the lower barrel section shape-keeping device (2): install two lower shape-keeping roller frame support seats (21) on the bottom workbench, and install two lower shape-keeping roller frames (22) on one lower shape-keeping roller frame support seat (21) respectively. Adjust the rotation angle of the roller support on the lower shape-keeping roller frame (22) so that the rollers of the lower shape-keeping roller frame (22) are in close contact with the outer walls of the two lower connected barrel sections; Step A3, installation of the upper barrel section shape-keeping device (3): after the two lower coupled barrel sections have completed shape-keeping, two lower shape-keeping frame pillars (31) are symmetrically installed on the outer side of the lower coupled barrel section, a lower shape-keeping support frame (32) is installed on the upper end of the lower shape-keeping frame pillars (31), the lower arc of the lower shape-keeping support frame (32) is tightly fitted with the outer wall of the lower coupled barrel section, an upper shape-keeping roller frame (34) is installed on the lower shape-keeping support frame (32), the rotation angle of the roller support on the upper shape-keeping roller frame (34) is adjusted so that the roller is in tight contact with the outer wall of the two upper coupled barrel sections, an upper shape-keeping support frame (33) is installed on the lower shape-keeping support frame (32), the lower arc of the upper shape-keeping support frame (33) is tightly fitted with the outer wall of the upper coupled barrel section.

9. The method for maintaining the shape of the barrel end surface welding according to claim 6, characterized in that: Step S2 also includes the following steps: Step B1, fixture rotation: the welding surface fixture (4) is initially installed on both sides of the welding work area, the extension surface of the welding surface fixture (4) in the initial posture is not coplanar with the extension surface of the working posture, and the welding surface fixture (4) rotates from the initial posture to the working posture during operation; Step B2, fixture positioning: the welding surface fixture (4) is adjusted in position until all the rotating clamping support cylinders (42) on the fixture frame (41) of the welding surface fixture (4) are in an effective working position, at which time the axis of the fixed part of the rotating clamping support cylinder (42) is perpendicular to the end face of the barrel section, the rotating clamping part is outside the end face of the barrel section, and the end face of the barrel section is within the clamping working range of the rotating part; Step B3, clamping the fixture: tighten the rotary clamping part on the rotary clamping support cylinder (42), and the end of the rotary clamping part is crimped onto the welding surface.

10. The method for welding the barrel end surface according to claim 1, characterized in that: Step S3 also includes the following steps: Step C1, positioning the welding operation table (5): the welding operation table (5) is moved to the vicinity of the welding surface of the barrel section assembly, and the position of the welding operation table (5) is finely adjusted so that the end of the mechanical arm of the welding operation table (5) is aligned with the point to be welded; Step C2, welding path planning: teaching the welding path of the mechanical arm of the welding operation table (5) through the teaching pendant; Step C3, welding process execution: writing a control program for the welding operation table (5), controlling the mechanical arms of the front and rear welding operation tables (5) to link with the lifting platform of the corresponding welding operation table (5) to achieve full coverage of the welding path, and controlling the welding process of the welding operation table (5) to proceed synchronously.

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