CN115922054A - A Welding Process for Long Barrel Section of Storage Tank - Google Patents

Abstract

The invention provides a storage box long cylinder section welding process, which comprises the following steps: the long cylinder section comprises a plurality of arc wall plates; the welding process comprises the following steps: reserving a wall plate, and milling welding allowance on two circumferential sides of the other wall plates; welding the wall plate subjected to welding allowance milling to form a barrel section prefabricated part; measuring the arc lengths of the two axial ends of the welded barrel section prefabricated part; calculating the arc length required by the reserved wall plate according to the measurement result and the perimeter requirement of the finished product cylinder section; according to the calculation result, milling the welding allowance of the two circumferential sides of the reserved wall plate to obtain the required arc length; and welding the reserved wall plate and the barrel section prefabricated member to form a finished barrel section. The welding method solves the problem of excessive milling of welding allowance by reserving the wall plate.

Description

A Welding Process for Long Barrel Section of Storage Tank

technical field

The invention relates to the field of welding, in particular to a welding process for a long barrel section of a storage tank.

Background technique

Usually, the existing tank section is fabricated by vertical friction stir welding. However, for the long or super-long barrel section (such as 6-meter level) of the storage tank, it is necessary to uniformly mill the multiple short barrel sections completed by vertical friction stir welding, and then splice them together. Therefore, the storage tank needs to be assembled and welded with multiple girth welds, and it is easy to mill too much, resulting in the welding size of the long tube section of the finished product not meeting the requirements.

In order to improve the welding accuracy of the finished barrel section, it is particularly important to design a welding process for the long barrel section of the storage tank.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a welding process for the long barrel section of the storage tank.

The invention provides a welding process for a long barrel section of a storage tank, which includes: the long barrel section includes a plurality of arc wall panels; the welding process includes: reserving one wall panel, and performing welding allowance milling on both sides of the remaining wall panels; Weld the wall plate with welding allowance milling to form the prefabricated part of the barrel section; measure the arc length at both axial ends of the prefabricated barrel section after welding; Reserve the required arc length of the wall plate; according to the calculation results, carry out welding allowance milling on both sides of the reserved wall plate in the circumferential direction to obtain the required arc length; weld the reserved wall plate and the prefabricated part of the tube section to form the finished tube section .

According to an embodiment of the present invention, it includes a first wall panel, a second wall panel, a third wall panel and a fourth wall panel; the fourth wall panel is a reserved wall panel; the reserved For one wall plate, carry out welding allowance milling on both sides of the remaining wall plate in the circumferential direction, including: hoisting the first wall plate to the friction stir welding device, clamping and fixing one side of the wall plate in the circumferential direction, and welding it Residue milling: disassembling the first wall plate from the friction stir welding device, and performing welding margin milling on the second wall plate and the third wall plate in sequence.

According to an embodiment of the present invention, the reserved one wall plate, before milling the welding allowance on both sides of the remaining wall plate, further includes: , The required arc length of the third wall board is preset.

According to an embodiment of the present invention, the hoisting of the first wall plate to the friction stir welding device, clamping and fixing one side of its circumferential side, and milling the welding allowance includes: according to the The arc length required for the first wall plate is based on the axial end face of the first wall plate, and the welding milling allowance on the circumferential side of the first wall plate is marked by using a square and a pointed steel line; hoist the first wall plate to the friction stir welding device, use the upper pressing mechanism of the friction stir welding device to clamp and fix the milling backing plate on one side of its circumference to the main beam, so that The marking line is located in the milling groove; align the milling cutter of the welding equipment with the marking line of the first wall plate; start the main shaft of the welding equipment to complete the milling of the welding allowance on the circumferential side of the first wall plate .

According to an embodiment of the present invention, the friction stir welding device includes the main beam, a base assembly, a front seat assembly, a rear seat assembly, and a lower beam assembly arranged between the main beam and the base assembly The base assembly includes a base beam, and a plurality of profiling support seats are provided at both ends of the base beam in the width direction; one end of the front seat assembly and one end of the rear seat assembly are respectively arranged on the base The two ends of the length direction of the seat crossbeam; the other end of the front seat assembly and the other end of the rear seat assembly are respectively arranged at the two ends of the length direction of the main crossbeam to support the main crossbeam; the length direction of the lower crossbeam The two ends are respectively fixedly connected with the front seat assembly and the rear seat assembly; the lower beam assembly includes a lower beam and a support assembly; the support assembly is arranged at both ends of the lower beam in the width direction and extends outward; The support assembly includes a plurality of side support rods and cylinder section support rods; one end of the plurality of side support rods is fixedly connected to the lower beam, and the other end is connected to the cylinder section support rods; the side support rods are movable A telescopic structure; a plurality of first vertical support rods are arranged between the main beam and the lower beam to support the main beam; a detachable set is provided between the base beam and the lower beam A plurality of second vertical support rods are used to support the lower beam; the first vertical support rods and the second vertical support rods are telescopic mechanisms.

According to an embodiment of the present invention, the welding of the wall plate that has been milled with a welding allowance to form a prefabricated barrel section includes: replacing the milling backing plate with a welding backing plate; The plate is hoisted to the friction stir welding device, and its circumferential side is clamped and fixed in place by the upper pressing mechanism, so that the side edge is located at the center of the welding backing plate, and the cylinder on the side of the width direction of the lower beam is used The supporting rod supports the other side of the first wall plate in the circumferential direction; the second wall plate is clamped and fixed so that the welding edge of the first wall plate and the second wall plate are attached to each other. Combine; use a stirring pin to replace the milling cutter, the stirring pin is set against the welding edge, after the tack welding, start the main shaft of the welding equipment, complete the welding of the first wall plate and the second wall plate, and complete The first friction stir welding seam forms a 1/2 arc cylinder section; loosens the upper pressing mechanism, shrinks the second vertical support between the lower beam assembly and the base beam of the base assembly Rod; rotate the 1/2 circular arc cylinder section by 90°, adjust its upper side edge to be located in the center of the welding backing plate, and press it tightly, and its lower side is adaptively supported by a plurality of the profiling support seats Complete the clamping and fixing of the third wall plate, so that the circumferential side edge of the third wall plate fits with the upper side edge of the 1/2 arc tube section to form a welding edge; the other The side edge is supported by the support bar of the cylinder section; the stirring needle is aligned with the welding edge, and after the tack welding, the main shaft of the welding equipment is started to complete the welding of the third wall plate and the 1/2 arc cylinder section. Welding, complete the second friction stir welding seam to form a 3/4 arc tube section.

According to an embodiment of the present invention, the welding of the reserved wall plate and the prefabricated part of the barrel section to form the finished barrel section includes: releasing the upper pressing mechanism, shrinking the side support rod, and placing the 3 /4 The circular arc cylinder section continues to rotate 90°, adjust the upper side edge to be located in the center of the welding backing plate, and press it tightly; complete the clamping and fixing of the fourth wall plate, so that the circumferential direction of the fourth wall plate The edge of one side is attached to the upper side edge of the 3/4 arc tube section to form a welding edge; the edge of the other side is supported by the support bar of the tube section; Finally, start the main shaft of the welding equipment to complete the welding on the circumferential side of the fourth wall plate and complete the third friction stir welding seam; loosen the upper pressing mechanism, shrink the side support rod, The section continues to rotate 90°, adjust the edge on the other side of the fourth wall plate so that it is located in the center of the welding backing plate, and press the cylinder section again to complete the welding on the other side of the fourth wall plate. Welding, complete the fourth friction stir welding seam to form the finished tube section.

According to an embodiment of the present invention, the releasing the upper pressing mechanism includes: releasing a plurality of quick-pressing clamps of the upper pressing mechanism.

According to an embodiment of the present invention, after the welding of the reserved wall plate and the prefabricated part of the barrel section to form the finished barrel section, further includes: disassembling the finished barrel section, and restoring the friction stir welding device to its original state.

According to an embodiment of the present invention, the dismantling of the finished barrel section includes: releasing the quick-pressing clamp, disassembling the upper pressing mechanism from the main beam; using the first vertical support bar to support the the main beam, loosen the connection between the rear seat assembly and the main beam, the lower beam assembly, and the base assembly, and remove the rear seat assembly; shrink the second vertical support rod, Use the sling to lift the finished tube section to a certain height so that it is no longer in contact with the main beam and the profiling support seat, move it out of the friction stir welding device horizontally along the axial direction, and place it on the tube section support on the rack to complete the disassembly of the finished tube section.

According to the welding process of the long barrel section of the storage tank of the present invention, by reserving a wall plate, first carry out welding allowance milling and welding on both sides of the remaining wall plate in the circumferential direction, and then according to the measurement results of the welded barrel section prefabricated parts, The wall plate is reserved for welding allowance milling and welding to form the finished tube section, which solves the problem that the size of the finished tube section cannot meet the requirements due to excessive milling of the welding allowance on the wall plate.

It should be understood that the above general description and the following specific embodiments are only exemplary and explanatory, and should not limit the scope of the present invention.

Description of drawings

The accompanying drawings, which are a part of the specification of this invention, illustrate example embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a perspective view of a horizontal friction stir welding device according to an embodiment of the present invention;

Fig. 2 is the front view of the horizontal friction stir welding device of one embodiment of the present invention;

Fig. 3 is the top view of the horizontal friction stir welding device of one embodiment of the present invention;

Fig. 4 is the left view of the upper pressing mechanism of another embodiment of the present invention;

Fig. 5 is a flow chart of a welding process for a long barrel section of a storage tank according to an embodiment of the present invention;

Fig. 6 is a flowchart of the use of a horizontal friction stir welding device according to an embodiment of the present invention;

Figure 7 is a side view of a tank barrel section according to one embodiment of the present invention.

Explanation of reference signs:

1-base assembly, 2-rear seat assembly, 3-lower beam assembly, 4-front seat assembly, 5-main beam, 6-upper pressing mechanism, 7-pressing rod, 8-base beam, 9-press Tight seat, 10-Profiling support seat, 11-Clamp beam, 12-Quick pressure clamp, 13-Adjusting backing plate, 14-Side support rod, 15-Cylinder support rod, 16-First vertical support rod, 17- The second vertical support bar, 18-lower beam, 19-the first wall panel, 20-the second wall panel, 21-the third wall panel, 22-the fourth wall panel, FSW-1-the first road FSW weld, FSW-2-second FSW weld, FSW-3-third FSW weld, FSW-4-fourth FSW weld.

Detailed ways

The characteristics and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only configured to explain the present invention and to exemplify the principle of the present invention, and are not configured to limit the present invention. Additionally, the mechanical components in the figures are not necessarily drawn to scale. For example, the size of some structural components or regions in the drawings may be exaggerated for other structural components or regions, so as to facilitate the understanding of the embodiments of the present invention.

The orientation words appearing in the following description are all directions shown in the figure, and do not limit the specific structure of the embodiment of the present invention. In the description of the present invention, it should be noted that unless otherwise specified, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral ground connection; it can be directly connected or indirectly connected through an intermediary. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Furthermore, the terms "comprising", "comprising", "having" or any other variation thereof are intended to cover a non-exclusive inclusion such that a set of elements comprising a structure or component includes not only those elements, but also includes elements not expressly listed or inherently included. belong to structural parts and other mechanical parts on components. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the article or device comprising the element.

Spatially relative terms such as "below", "beneath", "under", "lower", "above", "on", "higher", etc. are used to facilitate description to explain the relative The orientation of two elements means that these terms are intended to encompass different orientations of the device in addition to orientations other than those shown in the figures. In addition, for example, "one element is on/under another element" may mean that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first", "second" and the like are also used to describe various elements, regions, parts, etc., without particularly implying a sequence or sequence, and should not be construed as limiting. Similar terms refer to similar elements throughout the description.

In the process of describing the present invention below, only "rocket", "launch vehicle", "spacecraft", "space vehicle" or "missile" may be used in the description of certain scenarios. limited to the specific words used. Usually, the rocket of the present invention not only includes space vehicles for carrying satellites or spaceships or other detectors, but also includes weapons such as various types of missiles and rockets for carrying military loads, and can send payloads into the air. of similar products. When interpreting the above specific words, those skilled in the art should not limit the rocket to only one of the launch vehicle or missile according to the specific words used to describe the scene, so as to narrow the protection scope of the present invention.

It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

Fig. 1 is a perspective view of a horizontal friction stir welding device of an embodiment of the present invention; Fig. 2 is a front view of a horizontal friction stir welding device of an embodiment of the present invention; Fig. 3 is a horizontal friction stir welding device of an embodiment of the present invention The top view of the welding device; Fig. 4 is a left side view of the upper pressing mechanism of another embodiment of the present invention; Fig. 5 is a process flow diagram of a long tube section welding process of a storage tank according to an embodiment of the present invention; Fig. 6 is a The flow chart of the use of the horizontal friction stir welding device of the embodiment; FIG. 7 is a side view of the barrel section of the tank according to an embodiment of the present invention.

As shown in FIG. 1 , the present invention provides a horizontal friction stir welding device, which includes: a base assembly 1 , a front seat assembly 4 , a rear seat assembly 2 , a main beam 5 and an upper pressing mechanism 6 . The base assembly 1 comprises a base beam 8 . One end of the front seat assembly 4 and one end of the rear seat assembly 2 are respectively arranged at two ends of the base beam 8 in the length direction. The other end of the front seat assembly 4 and the other end of the rear seat assembly 2 are respectively arranged at two ends of the main beam 5 in the length direction to support the main beam 5 . The upper pressing mechanism 6 is used for pressing the barrel section of the storage tank on the main beam 5, so as to weld the barrel section of the storage box.

Specifically, limited by the structural characteristics of the storage tank product and the existing equipment level, the difficulty of the entire production and manufacturing process of the storage tank when the girth welding of the storage tank is a bottleneck process that restricts the efficient production and delivery of the storage tank. Every additional girth weld will significantly increase the production cycle and quality risk of the tank. As the requirements for the design and quality level of rocket storage tanks are getting higher and higher, the manufacture of 6-meter-class long-section or ultra-long-section storage tanks is constantly developing towards the direction of integrated simplified design and efficient production. Therefore, the long-tube section is proposed One-piece welding requirements for even very long barrel sections to reduce tank girth weld welding. For the short tube section with a length of less than 2 meters, it is usually manufactured by vertical friction stir welding in China. Limited by equipment height restrictions and ultra-high factory building restrictions, if a vertical assembly and welding scheme is adopted for long barrel sections (such as 6-meter-longer barrel sections), the height of welding-related equipment needs to be greatly increased, and the cumulative height of the products to be welded is added. , the height of the factory building will be doubled, which will have a negative impact on the construction of the factory building and production safety. The vertical welding scheme is difficult to meet the welding needs of the long tube section.

In this embodiment, the front seat assembly and the rear seat assembly are main frames connected front and rear of the horizontal friction stir welding device. The main beam is the main supporting beam, which provides the rigid inner support force of milling and welding for the tank wall plate to be welded. Milling or welding backing plates can be installed on the main beam, and the two backing plates can be installed alternately. The upper hold-down mechanism provides a rigid outer hug to the milled or welded panel, preventing the panel from moving during processing. The base assembly provides support for the tank section at the bottom. The front seat assembly and the rear seat assembly are the front and rear connecting frames of the overall device. The horizontal friction stir welding device of this embodiment adopts a horizontal mode to support the long barrel section or the super long barrel section of the storage tank to be welded as a whole to complete the overall friction stir welding (that is, the welding side pressure of the length direction of the wall plate of the storage tank to be welded tightly on the main beam, the main beam is used as the inner support beam to support the upper part, and the base component supports the lower part), without the need for higher equipment and plant conditions, the longitudinal section of the entire storage tank can be seam welding, without the need for circumferential seam welding, which reduces the difficult assembly welding process in the production of the existing long barrel section of the storage tank, reduces the quality risk of the production of the barrel section of the storage tank, and significantly improves the safety of the barrel section of the storage tank Productivity.

According to one embodiment of the present invention, the horizontal friction stir welding device includes two upper pressing mechanisms, and the two upper pressing mechanisms are arranged on both sides in the width direction of the main beam, and the two wall plates to be welded are respectively To compress.

In this embodiment, pressing the two upper pressing mechanisms can respectively provide rigid outer hugs to the two arc-shaped wall panels to be milled or welded to achieve compression, which can ensure that the welding edges of the wall panels are assembled in place. There is no movement during the process to complete the milling or welding of the 4 curved wall panels to form a long tube section.

According to an embodiment of the present invention, the base beam, the front seat assembly, the rear seat assembly and the main beam can use H-shaped steel as their main structure to reduce the weight of the device. The base assembly includes a workbench connecting plate for connecting with the workbench, a front seat adapter plate for connecting with the front seat assembly and a rear seat adapter plate for connecting with the rear seat assembly. The connecting plate of the workbench, the adapter plate of the front seat and the adapter plate of the rear seat can form a reliable connection with the base beam (H-shaped steel) through bolts, so as to facilitate the installation and disassembly of the components. The workbench connecting plate can be reliably fixed on the workbench by several pairs of φ20 anchor bolts to realize the fixing of the base component and the workbench.

According to an embodiment of the present invention, the front seat assembly includes a first base connecting plate, which can be fixedly connected with the H-shaped steel of the front seat assembly through bolts. The rear seat assembly includes a second base connecting plate, which can be fixedly connected with the H-shaped steel of the rear seat assembly through bolts. The first base connecting plate of the front seat assembly and the second base connecting plate of the rear seat assembly can be fastened and connected with the front seat adapter plate and the rear seat adapter plate of the base assembly by bolts respectively, so that the front seat assembly, the rear seat The seat component is fixedly connected with the base component.

According to an embodiment of the present invention, three torsion ribs are respectively welded on both sides of the front seat assembly (H-shaped steel) and the rear seat assembly (H-shaped steel) in the width direction to ensure the rigidity in the width direction and increase its stability.

In this embodiment, the weight of the front seat assembly and the rear seat assembly is reduced by using H-shaped steel. Setting the torsional stiffener plate can prevent deflection due to insufficient rigidity in the width direction of the front seat assembly and the rear seat assembly during the welding process of the barrel section, thereby affecting the quality of the weld seam and enhancing the stability of the welding.

As shown in Figure 1, according to an embodiment of the present invention, in addition to the base assembly 1, the front seat assembly 4, the rear seat assembly 2, the main beam 5 and the upper pressing mechanism 6, the horizontal friction stir welding device also includes a The lower beam assembly 3 between the main beam 5 and the base beam 8 . The lower beam assembly 3 includes a lower beam 18 and a support assembly. Both ends of the lower beam 18 in the length direction are fixedly connected to the front seat assembly 4 and the rear seat assembly 2 respectively. The supporting components are arranged at both ends of the lower beam 18 in the width direction, and extend outwards to support the barrel section of the storage tank.

In this embodiment, for example, four 1/4 arc wall panels are subjected to four friction stir welding longitudinal seam welding. The support assembly of this embodiment can support the sides in the length direction of 1/4 of the wall plate, and can also support the inside of the side wall in the length direction of the wall plate that has completed the longitudinal seam welding, so as to provide support for the main beam and reduce the The pressure of the main beam avoids the concave deformation of the main beam. At the same time, the arc shape of the cylinder section is also supported to prevent deformation of the cylinder section.

According to an embodiment of the present invention, the front seat assembly further includes a first lower beam connecting plate, which can be fixedly connected with the H-shaped steel of the front seat assembly by bolts. The rear seat assembly also includes a second lower beam connecting plate, which can be fixedly connected with the H-shaped steel of the rear seat assembly by bolts. The lower beam adopts square steel as its main structural frame. The lower beam assembly also includes a first front seat connecting plate and a first rear seat connecting plate, the first front seat connecting plate and the first rear seat connecting plate are respectively fixedly connected to the first lower beam connecting plate and the second lower beam connecting plate by bolts, The lower beam assembly is fixedly connected with the front seat assembly and the rear seat assembly respectively.

According to an embodiment of the present invention, the main beam further includes a second front seat connecting plate and a second rear seat connecting plate, and the second front seat connecting plate and the second rear seat connecting plate are fixedly connected to the H-shaped steel of the main beam. Both ends of the main beam in the length direction are fixedly connected to the front seat assembly and the rear seat assembly through the second front seat connecting plate and the second rear seat connecting plate respectively.

According to one embodiment of the present invention, the support assembly includes a plurality of side support rods 14 and barrel section support rods 15 . One end of a plurality of side support rods 14 is fixedly connected with the lower beam 18 , and the other end is connected with the support rod 15 of the cylinder section.

According to an embodiment of the present invention, the side support rod 14 is a telescopic structure.

According to one embodiment of the invention, each side support bar 14 comprises two hollow bars. Two hollow rods are telescopically connected by threads.

In this embodiment, the side support rod is designed as a telescopic structure, which can drive the support rod of the cylinder section to stretch out and hold the wallboard in the semi-finished state of the cylinder section, and can also provide a support for the arc-shaped inner circular surface of the cylinder section after the cylinder section is closed. support. In addition, the length of the side support rods can be adjusted according to the size of the wall plate of the tank (that is, the diameter or radius of the cylinder section), so as to support the lengthwise side or the inner wall of the wall plate adaptively.

As shown in Figures 2, 3 and 4, according to an embodiment of the present invention, the upper pressing mechanism 6 includes two clamp beams 11, the clamp beams 11 are arranged along the length direction of the main beam 5, and the two ends of the length direction are connected to the main beam. 5 fixed connections. The clamp beam 11 is provided with multiple groups of quick-pressing clamps 12 along its length direction. The two clamping beams 11 are respectively used to compress the welds of the two tank barrel sections. Multiple sets of quick-pressing fixtures 12 are used to press the tank section to the main crossbeam 5 along the length direction of the fixture beam 11 .

In the horizontal friction stir welding device provided in this embodiment, a row of quick-pressing fixtures are respectively provided on the two fixture beams, and the two ends of the fixture beam in the length direction can be fastened and fixed to the main beam by bolts. Aiming at the local deformation position of the wall plate of the tank barrel section, it can be locally adjusted by adjusting the compression degree of the quick-pressing fixture near it, which ensures the overall compaction accuracy of the wall plate and reduces the processing difficulty of the fixture beam (such as straight line degrees) and production costs. In addition, when it is necessary to replace the milling or welding backing plate, and when each weld seam of the cylinder section is welded and rotated, it is not necessary to disassemble or remove the upper pressing mechanism as a whole, and then hoist it back after the product is set or rotated in place. Install. It only needs to loosen the quick-pressing clamp, without repeated disassembly and assembly of the clamp beam, to complete the replacement of the backing plate or the rotation of the cylinder section, which is more convenient to use, saves the time of disassembly and hoisting, and improves the production efficiency. Practice has proved that using the horizontal friction stir welding device of this embodiment can save about 2 hours of disassembly and hoisting time each time.

According to an embodiment of the present invention, the quick-pressing jig 12 includes a front-end pressing portion for pressing the barrel section of the tank. The front end pressing portion includes a pressing rod 7 and a pressing seat 9 . The compression rod 7 is threadedly connected with the compression seat 9, so that the compression seat 9 moves along the length direction of the compression rod 7, so as to adjust the extrusion degree of the compression seat to the storage tank tube section.

In this embodiment, after the tank section is placed on the main beam, the clamp beam is pressed on the front side of the cylinder section (that is, the outer surface of the cylinder section), and the handle of the quick-press clamp is pressed down to make the pressing part of the front end of the quick-press clamp The tight seat compresses the barrel section. The pressing rod is threadedly connected with the pressing seat, so that the height of the pressing seat can be adjusted. By adjusting the height of the pressing seat, the quick-pressing fixture ensures the overall pressing accuracy of the wallboard.

According to an embodiment of the present invention, the quick-pressing jig 12 includes a front-end pressing portion for pressing the barrel section of the tank. The front end pressing portion includes a pressing rod 7 and a pressing seat 9 . Compression rod 7 is threadedly connected with fast pressing fixture body, makes compression rod drive compression seat 9 to move along the length direction of compression rod 7, to regulate the degree of extrusion of compression seat to storage tank tube section.

In this embodiment, the pressing rod is threadedly connected with the body of the fast pressing fixture, so that the height of the pressing seat can be adjusted. By adjusting the height of the pressing seat, the quick-pressing fixture ensures the overall pressing accuracy of the wallboard.

In this embodiment, the compression rod and the body of the quick compression clamp can be fastened by a nut.

According to an embodiment of the present invention, the base of the quick-pressing fixture is provided with a plurality of (for example, four) installation holes, and bolts can be used to fasten the quick-pressing fixture to the fixture beam through the installation holes.

According to an embodiment of the present invention, the clamp beam 11 is a hollow structure to reduce its weight.

The horizontal friction stir welding device of this embodiment adopts two lightweight fixture beams, which reduces the production cost.

Further, the fixture beam can be designed as a triangular hollow structure in section.

In this embodiment, according to actual production requirements, the structural design of the fixture beam can be adjusted through finite element simulation, and the strength or rigidity of the fixture beam can be calculated on the premise of ensuring the lightest quality. It has been proved by practice that through finite element simulation, the deformation of the fixture beam in the state of welding stress can be controlled to be less than 3mm.

According to an embodiment of the present invention, the main beam is provided with a backing plate mounting seat for mounting a welding backing plate or a milling backing plate. The backing plate mounting seat is fixedly connected with the H-shaped steel of the main beam.

In this embodiment, the milling backing plate can be fastened to the center of the backing plate installation seat by countersunk head screws, so as to mill the welding edge of the wall plate before welding. For example, milling backing plates can be replaced with welding backing plates to weld the welded edges of the siding. During friction stir welding of barrel sections, welding backing plates or milling backing plates are used to provide rigid internal support for the barrel sections.

According to an embodiment of the present invention, a plurality of profiling support seats 10 are provided at both ends of the base beam 8 in the width direction. The upper sides of the plurality of profiling support seats 10 are arc-shaped, so as to adaptively support the barrel section of the storage tank.

In this embodiment, the inner arc of the profiling support seat is consistent with the arc shape of the outer diameter of the barrel section, providing support for the outer surface of the barrel section and ensuring the arc shape of the barrel section. The profiling support seat can be connected with the side of the base beam through bolts.

According to an embodiment of the present invention, a plurality of first vertical support rods 16 are arranged between the main beam 5 and the lower beam 18 to support the main beam 5 . A plurality of second vertical support rods 17 are detachably arranged between the base beam 8 and the lower beam 18 to support the lower beam 18 .

In this embodiment, in the process of welding the wall plate of the tank, the first vertical support bar and the second vertical support bar can provide support for the main beam, and transmit the pressure on the main beam to the base assembly and to the The working table avoids the influence of welding quality due to the downward bending of the main beam.

According to an embodiment of the present invention, the first vertical support rod and the second vertical support rod are telescopic mechanisms, and are respectively connected telescopically by two hollow rods through threads.

In this embodiment, through the contraction of the second vertical support rod, it is convenient for the cylinder section to be removed from the horizontal friction stir welding device after the welding is completed.

According to an embodiment of the present invention, main crossbeam adjustment pads 13 are provided between the front seat assembly 4 and the main crossbeam 5 , and between the rear seat assembly 2 and the main crossbeam 5 . The height of the main crossbeam adjusting backing plate 13 is adjustable, so as to adjust the two ends of the main crossbeam 5 in the lengthwise direction to the level.

According to one embodiment of the present invention, bolt structures are arranged on both sides and below of the main beam adjustment backing plate along the width direction of the main beam. By adjusting the bolt structure, the heights of both ends of the main beam in the length direction are adjusted to be consistent, and the width direction is adjusted to be horizontally centered. , to meet the demand for milling and welding of barrel segments.

The horizontal friction stir welding device provided in this embodiment realizes the adjustment of the height of the main beam and the horizontal centering of the left and right by setting the main beam adjustment backing plate and the adjustment bolt structure. The structure is simple, the operation is convenient, and the cost is low.

According to an embodiment of the present invention, the two main crossbeam adjusting backing plates are respectively fixedly connected with the H-shaped steel of the front seat assembly and the H-shaped steel of the rear seat assembly through bolts.

As shown in Fig. 5, in another aspect, the present invention provides a welding process for a long barrel section of a tank, and the long barrel section includes a plurality of arc wall panels. The welding process includes: S1 reserves a wall plate, and mills the welding allowance on both sides of the remaining wall plate. S2 Weld the wall plate that has been milled with welding allowance to form a prefabricated part of the barrel section. S3 measures the arc lengths at both axial ends of the welded barrel section preform. S4 Calculate the arc length required for the reserved wall plate according to the measurement result and the perimeter requirement of the finished cylinder section. S5 performs welding allowance milling on both sides of the reserved wall plate in the circumferential direction according to the calculation results to obtain the required arc length. S6 Weld the reserved wall plate and the prefabricated part of the barrel section to form the finished barrel section.

In this embodiment, by reserving a wall plate, the welding allowance milling and welding are first carried out on both sides of the remaining wall plate circumferentially, and then the reserved wall plate is welded according to the measurement results of the prefabricated part of the welded tube section The finished tube section is formed by milling and welding the allowance, which solves the problem that the size of the finished tube section cannot meet the requirements caused by excessive milling of the welding allowance on the wall plate, and improves the precision of the welded finished tube section.

According to an embodiment of the present invention, it includes a first wall panel, a second wall panel, a third wall panel and a fourth wall panel, and the fourth wall panel is a reserved wall panel. Reserve one wall plate, and carry out welding allowance milling on both sides of the remaining wall plate, including: S11 Hoist the first wall plate to the friction stir welding device, clamp and fix it on the circumferential side, and carry out Weld allowance milling. S12 disassemble the first wall plate from the friction stir welding device, and perform welding allowance milling on the second wall plate and the third wall plate in sequence.

According to an embodiment of the present invention, one wall plate is reserved, and before performing welding allowance milling on both sides of the remaining wall plates, it also includes: first wall plate, second wall plate, and third wall plate The desired arc length is preset.

According to an embodiment of the present invention, hoisting the first wall plate to the friction stir welding device, clamping and fixing its circumferential side, and milling the welding allowance includes: S111 according to the requirements of the first wall plate The arc length is based on the axial end face of the first wall plate, and the welding milling allowance on the circumferential side of the first wall plate is marked by a square and pointed steel. S112 Lift the first wall plate to the friction stir welding device, use the upper pressing mechanism of the friction stir welding device to clamp and fix its circumferential side to the milling backing plate on the main beam, so that the marking line is located in the milling groove . S113 Align the milling cutter of the welding equipment with the marking line of the first wallboard. S114 Start the main shaft of the welding equipment to complete the milling of the welding allowance on the circumferential side of the first wall plate.

According to an embodiment of the present invention, the friction stir welding device includes a main beam, a base assembly, a front seat assembly, a rear seat assembly, and a lower beam assembly arranged between the main beam and the base assembly. The base assembly includes a base crossbeam, and a plurality of profiling support seats are arranged at both ends in the width direction of the base crossbeam. One end of the front seat assembly and one end of the rear seat assembly are respectively arranged at two ends of the base beam in the length direction. The other end of the front seat assembly and the other end of the rear seat assembly are respectively arranged at the two ends of the main beam in the length direction to support the main beam. Both ends of the lower beam in the length direction are respectively fixedly connected with the front seat assembly and the rear seat assembly. The lower beam assembly includes a lower beam and a support assembly. The supporting components are arranged at both ends of the lower beam in the width direction and extend outward. The support assembly includes a plurality of side support rods and barrel section support rods. One end of the plurality of side support rods is fixedly connected with the lower beam, and the other end is connected with the supporting rod of the cylinder section. The side support rod is a telescopic structure. A plurality of first vertical support rods are arranged between the main beam and the lower beam to support the main beam. A plurality of second vertical support rods are detachably arranged between the base beam and the lower beam to support the lower beam. The first vertical support rod and the second vertical support rod are telescopic mechanisms.

According to an embodiment of the present invention, welding the wall plate that has been milled with a welding allowance to form a prefabricated barrel section includes: S21 replacing the milling backing plate with a welding backing plate. S22 Hoist the first wall plate to the friction stir welding device, use the upper clamping mechanism to clamp and fix its circumferential side in place so that the side edge is located in the center of the welding backing plate, and use the cylinder on the side of the width direction of the lower beam The segment support rod supports the other side of the first wall panel circumferentially. S23 Clamping and fixing the second wall plate, so that the welding edges of the first wall plate and the second wall plate are attached. S24 Use the stirring pin to replace the milling cutter, and set the stirring pin against the welding edge. After tack welding, start the main shaft of the welding equipment to complete the welding of the first wall plate and the second wall plate, and complete the first friction stir welding seam. Form a 1/2 arc cylinder segment. S25 loosen the upper pressing mechanism, shrink the second vertical support rod between the lower beam assembly and the base beam of the base assembly. S26 rotates the 1/2 arc tube segment by 90°, adjusts its upper side edge to be located in the center of the welding backing plate, and presses it tightly, and its lower side is adaptively supported by multiple profiling support seats. S27 Complete the clamping and fixing of the third wall plate, so that the peripheral side edge of the third wall plate is attached to the upper side edge of the 1/2 arc tube section to form a welding edge. The other side edge is supported by the barrel section support rod. S28 Stirring needle and welding edge tool alignment, after tack welding, start the main shaft of the welding equipment, complete the welding of the third wall plate and 1/2 arc tube section, and complete the second friction stir welding seam to form a 3/4 circle arc section.

According to an embodiment of the present invention, the reserved wall plate is welded with the prefabricated part of the barrel section to form the finished barrel section, including: S61 loosening the upper pressing mechanism, shrinking the side support rods, and continuing the 3/4 arc barrel section Rotate 90°, adjust its upper side edge to be located in the center of the welding backing plate, and press it tightly. S62 Complete the clamping and fixing of the fourth wall plate, so that the peripheral side edge of the fourth wall plate fits with the upper side edge of the 3/4 arc tube section to form a welding edge; the other side edge is supported by the tube section Hold the rod. S63 Stirring pin and welding side tool alignment, after tack welding, start the main shaft of the welding equipment, complete the welding of the fourth wall plate on the circumferential side, and complete the third friction stir welding seam. S64 Loosen the upper pressing mechanism, shrink the side support rod, continue to rotate the barrel section by 90°, adjust the edge of the fourth wall plate on the other side in the circumferential direction so that it is located in the center of the welding backing plate, and press the barrel section again to complete The welding of the fourth wall plate to the other side of the circumference completes the fourth friction stir welding seam to form the finished tube section.

Specifically, the length of a single section of an existing storage tank in China generally does not exceed 2 meters. In order to meet the requirements of the performance parameters (such as volume parameters) of the storage tank, the barrel section of the storage tank is usually combined and welded with multiple short sections, spliced into Long barrel section required. Therefore, the tank requires assembly welding of multiple girth welds. For example, if a 6-meter-long tank section is to be manufactured, at least three short sections must be used for combined welding, and at least two girth welds must be assembled and welded. However, the assembly and adjustment of the girth weld of the storage tank is relatively difficult, and the welding efficiency and welding quality are low, which is the bottleneck process of the entire storage tank production.

In this embodiment, by installing, debugging and using the friction stir welding device for the long section of the storage tank, the horizontal integral longitudinal seam welding of the 6-meter storage tank section can be realized without the need for circumferential seam welding.

According to an embodiment of the present invention, releasing the upper pressing mechanism includes: releasing a plurality of quick pressing clamps of the upper pressing mechanism.

According to an embodiment of the present invention, after welding the reserved wall plates to form the finished cylinder section, the method further includes: disassembling the finished cylinder section, and restoring the friction stir welding device to its original state.

According to an embodiment of the present invention, disassembling the finished tube segment includes: releasing the quick pressing clamp, and disassembling the upper pressing mechanism from the main beam. Use the first vertical support rod to withstand the main beam, loosen the connections between the rear seat assembly, the main beam, the lower beam assembly and the base assembly, and remove the rear seat assembly. Shrink the second vertical support rod, use the sling to lift the finished tube section to a certain height, so that it is no longer in contact with the main beam and the profiling support seat, remove it from the friction stir welding device along the axial direction, and place it on the tube segment bracket to complete the disassembly of the finished tube segment.

As shown in Figure 6, taking the barrel section of a rocket storage tank with a diameter of 3350 mm and a barrel section length of 6 meters as an example, four 1/4 arc wall plates can be welded by four friction stir welding through a horizontal friction stir welding device. Longitudinal seam welding, the specific process is as follows:

S001: Assemble the base assembly and fix it to the workbench.

S002: Assemble the front seat assembly, the rear seat assembly, and the lower beam assembly, and securely connect the base assembly, the lower beam assembly with the front seat assembly, and the rear seat assembly.

Wherein, step S002 also includes the assembly of the side support bar, the barrel segment support bar, the first vertical support bar, and the second vertical support bar, and the fixed connection between the components.

In order to reduce weight, the width of the H-shaped steel of the front seat assembly and the H-shaped steel of the rear seat assembly can be designed to be 300mm. Three torsion ribs are designed on both sides of the H-shaped steel of the front seat assembly and the H-shaped steel of the rear seat assembly in the width direction, so that the bottom width of the front seat assembly and the rear seat assembly can be increased to 950mm, which can enhance their stability.

S003: Assemble the main beam, fix it to the front seat assembly and the rear seat assembly, and adjust the main beam to a horizontal state.

This step also includes debugging the whole device.

S004: Assemble the milling backing plate and the upper pressing mechanism to the main beam, and clamp the wall plate to mill the wall plate of the long tube section.

In this step, a milling backing plate is installed above the main beam for milling the welding allowance of the wall plate. After the milling backing plate is installed in place, adjust the front and rear height of the main beam and the left and right centering position again by marking the dial indicator along the surface of the milling backing plate, and adjust the main beam and the milling backing plate to the exact center position to meet the requirements of subsequent milling and welding requirements.

As shown in Figure 7, this step includes milling the welding allowance of the first three wall panels, specifically including: S041 according to the required arc length of the first wall panel 19, with the axial end face of the wall panel as the reference, using a square and a pointed The head steel marks the milling allowance on the circumferential side of the first wall plate; S042 lifts the first wall plate to the device, and uses the upper clamping mechanism to clamp and fix one side of it in place to make it mark the line It is located in the milling groove; S043 starts the welding equipment spindle through the milling cutter of the welding equipment and the marking line of the first wall plate in the milling groove, and completes the milling of the allowance on the circumferential side of the first wall plate; S044 loosens Open the clamping mechanism, remove the first wall plate from the equipment, repeat S041~S043, complete the milling of the axial allowance on the other side of the first wall plate, and obtain the required arc length; S045 repeat S041~S044, The milling of the axial margins on both axial sides of the second wall plate 20 and the third wall plate 21 is completed in sequence to obtain the required arc length.

S005: Replace the milling backing plate with a welding backing plate, clamp the wall plates in sequence, press the two rows of quick-pressing fixtures, and weld the long barrel section.

As shown in Figure 5, this step includes performing assembly welding and dimension measurement on the first wall plate, the second wall plate, and the third wall plate, specifically including: S051 replacing the milling backing plate with a welding backing plate; S052 The first wall plate is hoisted to the device, and its circumferential side is clamped and fixed in place by the upper clamping mechanism, so that the side edge is located in the center of the welding backing plate, and the other side is dragged by the cylinder support bar; S053 Repeat S052 to complete the clamping and fixing of the second wall plate, so that the welding edge of the first wall plate and the second wall plate fit together; S054 use the stirring needle to replace the milling cutter on the main shaft of the welding equipment, and the stirring needle and the edge to be welded After tool setting and tack welding, start the spindle to complete the welding of the first wall plate and the second wall plate, that is, complete the first friction stir welding seam FSW-1, and obtain a 1/2 arc cylinder section; S055 loose Open the upper pressing mechanism, shrink the second vertical support rod, rotate the 1/2 arc tube section 90°, adjust the upper side edge to be located in the center of the welding backing plate, and the lower part is supported by the profiling support seat, press it again Tighten; S056 Repeat S052～S053 to complete the clamping and fixing of the third wall plate, so that the peripheral side edge of the third wall plate fits with the upper edge of the above 1/2 arc tube section to form a welding edge, and the third wall plate The edge of the other side of the wall plate is supported by the support bar of the cylinder section; S057 uses the stirring needle to meet the welding edge of S056. After the positioning welding, the main shaft is started to complete the welding of the third wall plate, that is, the second friction stirring process is completed. Weld the weld seam FSW-2 to form a 3/4 arc cylinder section; S058 loosen the upper pressing mechanism and shrink the side support rod, continue to rotate the 3/4 arc cylinder section by 90°, measure and record 3/4 of the arc cylinder section with a steel tape measure 4 The arc length of the axial ends of the arc cylinder segment.

This step also includes carrying out allowance milling to the fourth wall plate 22, which specifically includes: S151: According to the measurement results of the S058 steel tape and the perimeter requirements of the finished cylinder section, calculate the required arc length of the fourth wall plate; S152 uses Replace the welding backing plate with the milling backing plate, and replace the stirring needle on the main shaft of the welding equipment with a milling cutter; S153 repeat S041-S044 to complete the milling of the axial margin on both sides of the fourth wall plate according to the calculation result of S151, and obtain the required arc long.

This step also includes welding the fourth wall plate, specifically including: S251 Replace the milling backing plate with a welding backing plate, and replace the milling cutter with a stirring needle; S252 Adjust the upper edge of the 3/4 arc tube section so that it is on the welding backing plate center, and press it tightly; S253 clamps and fixes the fourth wall plate so that its upper edge fits with the edge of the upper side of the 3/4 arc tube section to form the edge to be welded, and the other side is supported by the tube section Hold the rod; S254 sets the tool against the welding edge in S253 through the stirring needle, start the spindle after tack welding, and complete the welding on one side of the fourth wall plate, that is, complete the third friction stir welding seam FSW-3; S255 Loosen the upper pressing mechanism, shrink the side support rod, continue to rotate the cylinder section by 90°, adjust the welding edge of the fourth welding seam to be located in the center of the welding backing plate, and press the cylinder section again; S254 completes the fourth wall plate and another The welding on one side is to complete the fourth friction stir welding seam FSW-4 to obtain the whole finished tube section.

S006: Disassemble the welded long barrel section of the finished product, and restore the welding process of the long barrel section of the tank to the original state.

This step includes: S061 loosen the two rows of quick-pressing clamps of the upper pressing mechanism, and disassemble the upper pressing mechanism from the main beam; S062 use the first vertical support rod to withstand the main beam, and loosen the rear seat assembly and the main beam, Remove the rear seat assembly at the connection between the lower beam assembly and the base assembly; S063 shrink the second vertical support rod, and use the sling to lift the long tube section to a certain height so that it is no longer in contact with the main beam and the profiling support seat , remove it from the welding process of the long barrel section of the storage tank along the axial direction and horizontally, and place it on the barrel section bracket to complete the disassembly of the finished long barrel section; S064 put the first vertical support rod against the main beam and restore the rear seat , The upper pressing mechanism restores the welding process of the long barrel section of the storage tank to the original state.

The above-mentioned embodiments of the present invention can be combined with each other and have corresponding technical effects.

The welding process of the long barrel section of the storage tank provided by the present invention can be completed by the above-mentioned horizontal friction stir welding device, or can be completed by using the existing support device or milling welding device.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention within.

Claims (10)

1. A welding process for the long barrel section of a storage tank, characterized in that the long barrel section includes a plurality of arc wall panels; Welding processes include: Reserve one wall plate, and carry out welding allowance milling on both sides of the remaining wall plates; Weld the wall plate that has been milled with welding allowance to form a prefabricated part of the barrel section; Measure the arc length at both axial ends of the welded barrel preform; According to the measurement results and the perimeter requirements of the finished tube section, calculate the arc length required for the reserved wall plate; According to the calculation results, the welding allowance is milled on both sides of the reserved wall plate to obtain the required arc length; Weld the reserved wall plate and the prefabricated part of the barrel section to form the finished barrel section. 2. The welding process according to claim 1, characterized in that, comprising a first wall plate, a second wall plate, a third wall plate and a fourth wall plate; stay siding; One wall plate is reserved, and the welding allowance milling is carried out on both sides of the remaining wall plates, including: hoisting the first wall plate to the friction stir welding device, clamping and fixing one side of its circumference, and milling the welding allowance; The first wall plate is disassembled from the friction stir welding device, and the welding allowance milling is performed on the second wall plate and the third wall plate in sequence. 3. The welding process according to claim 2, characterized in that, said reserving a wall plate, before performing welding allowance milling on both sides of the remaining wall plates, further comprising: , the required arc lengths of the second wall plate and the third wall plate are preset. 4. The welding process according to claim 3, characterized in that, the first wall plate is hoisted to the friction stir welding device, and its circumferential side is clamped and fixed, and it is welded The remaining milling includes: according to the required arc length of the first wall plate, taking the axial end face of the first wall plate as the reference, using a square and a pointed steel to measure the circumferential direction of the first wall plate Scribing the welding milling allowance on the side; Hoist the first wall plate to the friction stir welding device, and use the upper pressing mechanism of the friction stir welding device to clamp and fix the milling backing plate on one side of its circumference to the main beam, so that it can be scratched The line is located in the milled slot; Align the milling cutter of the welding equipment with the scribed line of the first wallboard; Start the main shaft of the welding equipment to complete the milling of the welding allowance on the circumferential side of the first wall plate. 5. The welding process according to claim 4, wherein the friction stir welding device comprises the main beam, a base assembly, a front seat assembly, a rear seat assembly, and is arranged on the main beam and the base The lower beam assembly between the seat assemblies; The base assembly includes a base beam, and a plurality of profiling support seats are provided at both ends of the base beam in the width direction; One end of the front seat assembly and one end of the rear seat assembly are respectively arranged at both ends of the length direction of the base beam; the other end of the front seat assembly and the other end of the rear seat assembly are respectively arranged at the length of the main beam. two ends of the direction to support the main beam; Both ends of the lower beam in the length direction are fixedly connected to the front seat assembly and the rear seat assembly; the lower beam assembly includes a lower beam and a support assembly; the support assembly is arranged at both ends of the lower beam in the width direction , and extend to the outside; the support assembly includes a plurality of side support rods and cylinder segment support rods; the side support rods are telescopic structures; Connect with the support rod of the cylinder section; A plurality of first vertical support rods are arranged between the main beam and the lower beam to support the main beam; a plurality of first vertical support rods are detachably arranged between the base beam and the lower beam. Two vertical support rods are used to support the lower beam; the first vertical support rod and the second vertical support rod are telescopic mechanisms. 6. The welding process according to claim 5, characterized in that, the welding of the wall plate that has been milled with a welding allowance to form a prefabricated part of the barrel section includes: replacing the milling backing plate with a welding backing plate; Hoist the first wall plate to the friction stir welding device, use the upper clamping mechanism to clamp and fix its circumferential side in place so that the side edge is located at the center of the welding backing plate, and use the width of the lower beam The support rod of the cylinder section on one side of the direction supports the other side of the first wall plate in the circumferential direction; Clamping and fixing the second wall plate, so that the welding edges of the first wall plate and the second wall plate are attached; Use a stirring pin to replace the milling cutter, and the stirring pin is aligned with the welding edge. After the tack welding, start the main shaft of the welding equipment to complete the welding of the first wall plate and the second wall plate, and complete the first One friction stir welding seam, forming a 1/2 arc tube section; releasing the upper pressing mechanism, shrinking the second vertical support rod between the lower beam assembly and the base beam of the base assembly; Rotate the 1/2 arc cylinder section by 90°, adjust the upper side edge to be located in the center of the welding backing plate, and press it tightly, and the lower side side is adaptively supported by a plurality of the profiling support seats; Complete the clamping and fixing of the third wall plate, so that the peripheral side edge of the third wall plate fits with the upper side edge of the 1/2 arc tube section to form a welding edge; the other side The edge is supported by the cylinder segment support rod; The stirring needle is aligned with the welding edge, and after the tack welding, the main shaft of the welding equipment is started to complete the welding of the third wall plate and the 1/2 arc tube section, and complete the second friction stir welding seam, Form a 3/4 arc cylinder segment. 7. The welding process according to claim 6, wherein the welding of the reserved wall plate and the prefabricated part of the cylinder section to form the finished cylinder section comprises: Loosen the upper pressing mechanism, shrink the side support rod, continue to rotate the 3/4 arc cylinder section by 90°, adjust the upper side edge to be located in the center of the welding backing plate, and perform pressing; Complete the clamping and fixing of the fourth wall plate, so that the peripheral side edge of the fourth wall plate fits with the upper side edge of the 3/4 arc tube section to form a welding edge; the other side The edge is supported by the cylinder segment support rod; The stirring needle is aligned with the welding edge, and after the tack welding, the main shaft of the welding equipment is started to complete the welding on the circumferential side of the fourth wall plate, and complete the third friction stir welding seam; Loosen the upper pressing mechanism, shrink the side support rod, continue to rotate the cylinder section by 90°, adjust the edge on the other side of the circumference of the fourth wall plate so that it is located in the center of the welding backing plate, and place the cylinder section again segment compression, complete the welding of the fourth wall plate to the other side in the circumferential direction, complete the fourth friction stir welding seam, and form the finished tube segment. 8. The welding process according to claim 5, wherein the releasing the upper pressing mechanism comprises: releasing a plurality of quick-pressing clamps of the upper pressing mechanism. 9. The welding process according to claim 8, characterized in that, after the welding of the reserved wall plate and the prefabricated part of the barrel section to form the finished barrel section, it further comprises: disassembling the finished barrel section, and friction stirring the The welding device is restored to its original state. 10. The welding process according to claim 9, wherein said disassembling the finished cylinder section comprises: releasing said quick-pressing clamp, and disassembling said upper pressing mechanism from said main beam; Use the first vertical support rod to withstand the main beam, loosen the connection between the rear seat assembly and the main beam, the lower beam assembly, and the base assembly, and remove the rear seat assembly ; Shrink the second vertical support rod, use the sling to lift the finished tube section to a certain height, so that it is no longer in contact with the main beam and the profiling support seat, and move it horizontally from the friction stir The welding device is removed and placed on the barrel section bracket to complete the disassembly of the finished barrel section.

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