Narrow gap welding apparatus and welding method using the same

Abstract

The present application provides a kind of for narrow gap welding device and welding method using the device, including support device;The support device is fixedly connected at the bottom of operating device;Support device top is fixedly connected with shrink joint structure;Support device top is fixedly connected with positioning part;Positioning part is slidably connected with floating welding part, and the bottom of floating welding part is slidably sleeved with adjusting part;Adjusting part is fixedly connected with protection device;The front side of adjusting part is fixedly connected with dust removal device;Welding plate, welding plate is slidably connected on support device, floating welding part uses the mode of slidably connected floating shaft, and spring is sleeved on floating shaft and can realize that welding main body is pushed down, automatically adjust according to welding profile height, adjusting part is driven two pitch adjusting shafts in the bottom of sliding sleeve frame by using two electric telescopic rods, realize the welding depth of intelligent control welding main body, improve welding quality.

Description

[0001] This application is a divisional application of the invention patent application with application number 2021108522423 entitled "Apparatus for Narrow Gap Welding", and the original application date was July 27, 2021. Technical Field

[0002] This invention belongs to the field of narrow gap welding technology, and more specifically, relates to a narrow gap welding apparatus and a welding method using the apparatus. Background Technology

[0003] Narrow gap welding is a gas shielded welding process used in thick plate welding where the workpiece is not beveled before welding, leaving only a narrow gap of about 10 mm. It employs multi-layer, multi-pass welding. With the rapid development of industrial technology, narrow gap welding technology has become the preferred technology for welding thick plate structures in modern industrial production. Because welding quality is involved, a good narrow gap welding device is particularly important.

[0004] For example, application number CN202010812058.1 relates to an ultra-narrow gap welding device and method for pipe welding, belonging to the field of welding technology. One such device includes a welding mechanism, a rotating mechanism, and a positioning mechanism. The welding mechanism rotates around the positioning mechanism via the rotating mechanism. The positioning mechanism is located inside the pipe to be welded, and the rotating mechanism is rotatably connected to the positioning mechanism. This invention enables transverse welding in bevels with small gap widths. Due to its narrow bevel width, low welding line energy, and low heat input during welding, it effectively suppresses molten pool growth and prevents molten pool collapse. This effectively solves the molten pool collapse defect and improves welding production efficiency. This invention is easy to operate and move, overcoming the difficulties and high technical requirements of operating large equipment in on-site welding.

[0005] Based on existing technology, it has been found that existing narrow-gap welding equipment lacks welding positioning and running devices, which greatly reduces welding accuracy and makes it unsuitable for welding longer profiles. This results in extremely low work efficiency. Furthermore, the lack of floating welding devices and dust removal systems means the welding depth cannot be adjusted according to the changing surface of the profile, leading to suboptimal shielding gas performance. Additionally, impurities within the bevel affect overall welding quality, significantly increasing the defect rate. Moreover, the lack of adjustable protective devices hinders cooling, failing to protect the weld joint from burns and eye injuries to workers. Finally, it fails to improve weld aesthetics and economic efficiency. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides an apparatus and welding method for narrow gap welding. This addresses the issues of existing narrow gap welding apparatuses lacking welding positioning and running devices, which significantly reduces welding accuracy and makes them unsuitable for welding longer profiles, resulting in extremely low work efficiency. Furthermore, the absence of floating welding and dust removal devices prevents the welding depth from adjusting to changes in the profile's outer surface, leading to suboptimal shielding gas performance. Additionally, impurities within the bevel negatively impact overall welding quality, significantly increasing the defect rate. Moreover, the lack of adjustable protective devices hinders cooling, failing to protect the weld joint from burns and eye injuries to workers, and ultimately fails to improve weld aesthetics and economic efficiency.

[0007] The purpose and effectiveness of the apparatus and welding method for narrow gap welding of the present invention are achieved by the following specific technical means: An apparatus for narrow gap welding, comprising a support device; The support device is fixedly connected to the bottom of the operating device; a contraction structure is fixedly connected to the top of the support device; a positioning part is fixedly connected to the top of the support device; a floating welding part is slidably connected to the positioning part, and an adjustment part is slidably fitted to the bottom of the floating welding part; a protective device is fixedly connected to the adjustment part; and a dust removal device is fixedly connected to the front side of the adjustment part. The welding plate is slidably connected to the support device.

[0008] Furthermore, the operating device includes: The running bracket is fixedly connected to the mounting base plate. The running rollers are arranged in a row, and each row of running rollers is rotatably connected to the running support; each row of running rollers is equipped with a gear at the top. The drive threaded rod is fixedly connected to the running support and is meshed with gears provided on the top of a row of running rollers.

[0009] Furthermore, the support device includes: The mounting base plate is fixedly connected to the bottom of the running device, and two rows of sliding rollers are connected to the rotating shaft on the mounting base plate. The support frame is fixedly connected to the mounting base plate.

[0010] Furthermore, the floating welding section includes: The welding body is fixedly connected to four floating shafts; There are four floating shafts, and each of the four floating shafts is slidably inserted into the positioning slide plate; each of the four floating shafts is fitted with a spring.

[0011] Furthermore, the dust removal device includes: The air nozzle is fixedly connected to the two adjustable shafts via a bracket. An air pump is fixedly connected to the positioning slide plate; the air pump pipe is connected to the air nozzle.

[0012] Furthermore, the adjustment unit includes: A sliding sleeve is fitted onto the welding body. Two electric telescopic rods are provided, and the two electric telescopic rods are fixedly connected to both sides of the sliding sleeve frame respectively; The adjustable shaft has two shafts, which are fixedly connected to the bottom sides of the sliding sleeve respectively; the bottom of each adjustable shaft is fitted with ball bearings.

[0013] Furthermore, the positioning part includes: The positioning slide plate has its two sides slidably connected to the support frame via sliding shafts; The drive screw has its rotation shaft connected to the support frame, and its threaded rotation is connected to the positioning slide plate.

[0014] Furthermore, the contraction structure includes: Contraction joint fixing plate, which is fixedly connected to the mounting base plate; The contraction roller frame is slidably connected to the contraction fixing plate via a sliding shaft, and a spring is fitted on the sliding shaft; a row of push rollers is connected to the rotating shaft on the contraction roller frame.

[0015] Furthermore, the protective device includes: The guard plate drives the threaded rod, and the rotating shaft of the guard plate drives the threaded rod is connected to two rod holders; the guard plate drives the threaded rod with reverse threads on both sides. The pole frame consists of two pole frames, each fixedly connected to one of the two adjustable shafts. The guard plate has two plates, and the two plates are respectively threadedly rotatably connected to both ends of the guard plate drive threaded rod; the two plates are slidably connected between the two rod frames through a sliding shaft.

[0016] Furthermore, the welding method of the apparatus for narrow gap welding: 1) Place the welding plate on top of the mounting base plate, and drive the adjusting positioning slide by rotating the drive screw to move the floating welding part to position the weld seam; 2) A row of running rollers on the set running device runs under the drive of the threaded rod, which drives the welding plate forward. During the process, the set shrinking roller frame squeezes the welding plate under the pressure of the spring. The set adjustment part has two electric telescopic rods that drive the two adjusting shafts at the bottom of the sliding sleeve frame to control the height difference between the adjusting shaft and the welding body and adjust the welding depth of the welding body. 3) During the process, the dust removal device can effectively blow high-pressure gas into the weld seam of the welding plate through the air nozzle.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This device incorporates a support system. Two rows of sliding rollers on the mounting base facilitate the sliding of the profiles. The separate rollers also create space in the center of the mounting base, allowing for the direct placement of small welding profiles, thus diversifying its use. The support frame further assists in the installation of the running device and the contraction joint structure, ensuring greater stability. The running device operates using a row of rollers driven by a threaded rod, resulting in greater stability. This threaded rod operation also provides more controllable speed, reduces effort, and improves welding quality. The running device enables automated profile movement, suitable for welding longer profiles, making it more practical and enabling integrated welding. It eliminates the need for repeated profile movement, preventing excessive weld seams and affecting the stress response of the welded plate. The contraction joint structure features a contraction joint roller frame; the elastically connected frame facilitates the fixing of profiles of varying widths, preventing excessively large weld seams that could compromise welding quality.

[0018] 2. This device includes a positioning unit that uses a drive screw to move and adjust the positioning slide plate, making positioning more convenient and improving work efficiency. The floating welding unit uses a sliding connection to a floating shaft, with a spring mounted on the shaft to push the welding body downwards. It automatically adjusts according to the height of the welding profile, broadening its application range. The adjustment unit uses two electric telescopic rods to drive two adjusting shafts at the bottom of the sliding sleeve, intelligently controlling the height difference between the adjusting shafts and the welding body to adjust the welding depth. Simultaneously, it ensures that the welding body can slide in real-time according to the profile surface through the support of the adjusting shafts during welding. The adjusting shafts use ball bearings embedded at the bottom for sliding, reducing wear. The adjustment unit is suitable for welding profiles with uneven surfaces, and the method of adjusting the welding depth using the adjustment unit greatly improves weld quality.

[0019] 3. This device includes a protective mechanism. Two guard plates on the protective mechanism are driven by threaded rods with reverse threads, allowing them to move simultaneously in opposite directions. This ensures that the two guard plates are aligned with the welding bevel in real time. Adjusting the distance between the two guard plates allows for scraping of the weld joint during welding, preventing the weld lines from spreading outwards, resulting in straighter and more aesthetically pleasing weld lines, thus increasing economic efficiency. The guard plates also effectively protect workers from burns and eye injuries. The dust removal device effectively blows high-pressure gas into the weld seam through nozzles, preventing internal impurities and dust, significantly reducing the defect rate of welds. It also facilitates ventilation and cooling, reducing the weld seam cooling time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the rear structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the bottom structure of the present invention.

[0023] Figure 4 This is a schematic diagram of the floating welding part structure of the present invention.

[0024] Figure 5 This is a cross-sectional view of the overall welding process of the present invention.

[0025] Figure 6 This is a schematic diagram of the support device structure of the present invention.

[0026] Figure 7 This is a schematic diagram of the positioning part structure of the present invention.

[0027] Figure 8 This is an enlarged schematic diagram of the floating welding part structure of the present invention.

[0028] Figure 9 This is a schematic diagram of the adjustment part of the present invention.

[0029] Figure 10 This is a schematic diagram of the protective device structure of the present invention.

[0030] Figure 11 This is a schematic diagram of the dust removal device of the present invention.

[0031] Figure 12 This is a schematic diagram of the operating device structure of the present invention.

[0032] Figure 13 This is a schematic diagram of the contraction joint structure of the present invention.

[0033] In the diagram, the correspondence between component names and drawing numbers is as follows: 1. Support device; 101. Install the base plate; 102. Install the support frame; 2. Positioning section; 201. Positioning slide; 202. Drive screw; 3. Floating welding section; 301. Welding body; 302. Floating shaft; 4. Adjustment section; 401. Sliding sleeve; 402. Electric telescopic rod; 403. Adjustable shaft; 5. Protective devices; 501. Protective plate drive threaded rod; 502. Rod frame; 503. Protective plate; 6. Dust removal device; 601. Air nozzle; 602. Air pump; 7. Operating device; 701. Running support; 702. Running roller; 703. Drive threaded rod; 8. Contraction joint structure; 801. Contraction joint fixing plate; 802. Contraction joint roller frame; 9. Welding plate. Implementation

[0034] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0035] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0037] As attached Figure 1 To be continued Figure 13 As shown: This invention provides an apparatus for narrow gap welding, comprising a support device 1; the support device 1 is fixedly connected to the bottom of an operating device 7; a narrowing structure 8 is fixedly connected to the top of the support device 1; a positioning part 2 is fixedly connected to the top of the support device 1; a floating welding part 3 is slidably connected to the positioning part 2, and an adjusting part 4 is slidably fitted to the bottom of the floating welding part 3; a protective device 5 is fixedly connected to the adjusting part 4; a dust removal device 6 is fixedly connected to the front side of the adjusting part 4; and a welding plate 9 is slidably connected to the support device 1.

[0038] As attached Figure 6 , 12As shown in Figure 13, the support device 1 includes: a mounting base plate 101, which is fixedly connected to the bottom of the running device 7, and two rows of sliding rollers are rotatably connected to the mounting base plate 101; a support frame 102, which is fixedly connected to the mounting base plate 101; the running device 7 includes: a running bracket 701, which is fixedly connected to the mounting base plate 101; running rollers 702, which are arranged in a row, and each row of running rollers 702 is rotatably connected to the running bracket 701; a row of running rollers 702... Each of the rollers 702 has a gear at its top; a drive threaded rod 703 is fixedly connected to the running bracket 701 and meshes with the gears at the top of each row of rollers 702; the contraction structure 8 includes: a contraction fixing plate 801, which is fixedly connected to the mounting base plate 101; a contraction roller frame 802, which is slidably connected to the contraction fixing plate 801 via a sliding shaft, and a spring is fitted on the sliding shaft; a rotating shaft is connected to the contraction roller frame 802. The mounting base 101 is equipped with two rows of sliding rollers, which facilitates the sliding of the profile on the mounting base 101. The two separate rows of sliding rollers also create space in the middle of the mounting base 101, allowing for the direct placement of small welding profiles and increasing versatility. The support frame 102 assists in the installation of the running device 7 and the contraction structure 8, making their installation more stable. The running device 7 operates using a row of running rollers 702 driven by a threaded rod 703, resulting in greater stability. The use of the threaded rod 703 also provides more controllable speed, reduces effort, and improves welding quality. The running device 7 enables automated profile movement and is suitable for welding longer profiles, making it more practical. The contraction structure 8 is equipped with a contraction roller frame 802. The elastically connected contraction roller frame 802 facilitates the fixing of profiles of different widths, preventing excessively large weld seams that could affect welding quality.

[0039] As attached Figure 7 To be continued Figure 9As shown, the positioning part 2 includes: a positioning slide plate 201, the two sides of which are slidably connected to the support frame 102 via sliding shafts; a drive screw 202, the drive screw 202's rotation shaft is connected to the support frame 102, and the drive screw 202 is threadedly rotatably connected to the positioning slide plate 201; the floating welding part 3 includes: a welding body 301, the welding body 301 being fixedly connected to four floating shafts 302; four floating shafts 302 are provided, and the four floating shafts 302 are respectively slidably inserted into the positioning slide plate 201; Springs are fitted onto each of the four floating shafts 302; the adjusting part 4 includes: a sliding sleeve 401, which is fitted onto the welded body 301; two electric telescopic rods 402, which are respectively fixedly connected to both sides of the sliding sleeve 401; and two adjusting shafts 403, which are respectively fixedly connected to both sides of the bottom of the sliding sleeve 401; ball bearings are fitted onto the bottom of each of the two adjusting shafts 403, and a positioning part 2 is provided. The positioning part 2 adopts... The movable adjustment and positioning slide plate 201 is achieved by driving the lead screw 202, making positioning more convenient and improving work efficiency. The floating welding part 3 adopts a sliding connection with the floating shaft 302, and a spring is installed on the floating shaft 302 to push the welding body 301 downward. It automatically adjusts according to the height of the welding profile, making it more widely applicable. In conjunction with the adjustment part 4, the two adjustable shafts 403 at the bottom of the sliding sleeve 401 are driven by two electric telescopic rods 402 to achieve intelligent control of the height difference between the adjustable shafts 403 and the welding body 301, thereby adjusting the welding depth of the welding body 301. At the same time, it can ensure that the welding body 301 can slide in real time according to the surface of the profile through the support of the adjustable shafts 403 during the welding process. The adjustable shafts 403 adopt a bottom embedded ball bearing to achieve sliding, reducing wear. The adjustment part 4 can be used for more profiles with uneven welding surfaces, and the method of adjusting the welding depth by using the adjustment part 4 can greatly improve the welding quality.

[0040] As attached Figure 10 , 11As shown, the protection device 5 includes: a guard plate drive threaded rod 501, the rotating shaft of which is connected to two rod holders 502; the guard plate drive threaded rod 501 has reverse threads on both sides; two rod holders 502 are provided, and the two rod holders 502 are respectively fixedly connected to two adjusting shafts 403; two guard plates 503 are provided, and the two guard plates 503 are respectively threadedly rotatably connected to both ends of the guard plate drive threaded rod 501; the two guard plates 503 are slidably connected between the two rod holders 502 via a sliding shaft; the dust removal device 6 includes: an air nozzle 601, which is fixedly connected to the two adjusting shafts 403 via a bracket; an air pump 602, which is fixedly connected to the positioning slide plate 201; the air pump 602 is pipe-connected to the air nozzle 601 and is equipped with a protective device. The protective device 5 has two protective plates 503 that can move simultaneously in opposite directions by using a threaded rod 501 driven by the protective plates with reverse threads. By setting the protective plates 503 to move in opposite directions, it can ensure that the two protective plates 503 are aligned with the welding bevel in real time. After adjusting the distance between the two protective plates 503, the weld joint can be scraped during the welding process, making the weld line straighter and more beautiful, increasing economic benefits. At the same time, the protective plates 503 can effectively protect the workers from burns and eye injuries. The dust removal device 6 can effectively blow high-pressure gas into the weld joint of the welding plate 9 through the air nozzle 601 to prevent the presence of impurities and dust inside, greatly reducing the defect rate of welding. It also helps to assist ventilation and cooling, reducing the welding cooling time.

[0041] The welding method of the device for narrow gap welding is as follows: 1) The welding plate 9 is placed on top of the mounting base plate 101, and the adjusting positioning slide plate 201 is driven by rotating the drive screw 202, which moves the floating welding part 3 to position the weld; 2) A row of running rollers 702 on the running device 7 is driven by the drive screw rod 703 to move and push the welding plate 9 forward. During the process, the shrinking roller frame 802 is squeezed by the spring to tighten the welding plate 9. The two electric telescopic rods 402 on the adjusting part 4 drive the two adjusting shafts 403 at the bottom of the sliding sleeve frame 401 to control the height difference between the adjusting shafts 403 and the welding body 301 and adjust the welding depth of the welding body 301; 3) During the process, the dust removal device 6 can effectively blow high-pressure gas into the weld of the welding plate 9 through the air nozzle 601.

[0042] In another embodiment, other structures remain unchanged. This embodiment provides another structural form of the mounting base plate 101. An anti-slip pad is provided on the top of the mounting base plate 101. By providing the pad on the mounting base plate 101, the frictional resistance can be increased, making the welding of small welding plates 9 more stable.

[0043] In use: First, fix the equipment to the ground on both sides of the mounting base 101. After connection, it can be put into use. During use, pull the contraction roller frame 802 to place the welding plate 9 on the top of the mounting base 101. Then, drive the adjusting positioning slide plate 201 by rotating the drive screw 202, thereby moving the floating welding part 3 to position the weld seam. Then, welding can be performed on the welding plate 9. The row of running rollers 702 on the running device 7 runs under the drive screw 703, moving the welding plate 9 forward. During the process, the contraction roller frame 802 squeezes the welding plate 9 under the pressure of the spring. During the operation of the welding plate 9, the two electric telescopic rods 402 on the adjusting part 4 drive the two adjusting shafts 403 at the bottom of the sliding sleeve 401 to achieve intelligent operation. The height difference between the adjustable shaft 403 and the welding body 301 is controlled to adjust the welding depth of the welding body 301. At the same time, it can ensure that the welding body 301 can slide in real time according to the surface of the profile through the support of the adjustable shaft 403 during the welding process. The welding body 301 will then weld the welding plate 9 to achieve integrated welding. During the welding process, the dust removal device 6 can effectively blow high-pressure gas into the weld seam of the welding plate 9 through the air nozzle 601 to prevent impurities and dust inside. Before welding, the two guard plates 503 can be adjusted in opposite directions by rotating the guard plate to drive the threaded rod 501, so as to adjust according to the weld seam and scrape the weld joint to prevent the welding rod from spreading outward after melting during welding. This makes the weld more aesthetically pleasing and also protects the workers. Finally, narrow gap welding is achieved.

[0044] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An apparatus for narrow gap welding, characterized in that: It includes a support device (1); the support device (1) is fixedly connected to the bottom of the operating device (7); a contraction structure (8) is fixedly connected to the top of the support device (1); a positioning part (2) is fixedly connected to the top of the support device (1); a floating welding part (3) is slidably connected to the positioning part (2), and an adjustment part (4) is slidably fitted to the bottom of the floating welding part (3); a protective device (5) is fixedly connected to the adjustment part (4); a dust removal device (6) is fixedly connected to the front side of the adjustment part (4); a welding plate (9) is slidably connected to the support device (1); wherein the support device (1) includes: a mounting base plate (101), the mounting base plate (101) is fixedly connected to the bottom of the operating device (7), and a welding plate (9) is slidably connected to the support device (1); The base plate (101) has two rows of sliding rollers connected to a rotating shaft; a support frame (102) is fixedly connected to the mounting base plate (101); the positioning part (2) includes: a positioning slide plate (201), the two sides of which are slidably connected to the support frame (102) via sliding shafts; a drive screw (202), the rotating shaft of which is connected to the support frame (102), and the drive screw (202) is threadedly connected to the positioning slide plate (201); the floating welding part (3) includes: a welding body (301), which is fixedly connected to four floating shafts (302); there are four floating shafts (302), and the four floating shafts (302) are respectively slidably inserted into the fixed base plate (101). The four floating shafts (302) are each fitted with a spring; the adjusting part (4) includes: a sliding sleeve (401), which is fitted on the welding body (301); two electric telescopic rods (402), and the shaft ends of the two electric telescopic rods (402) are respectively fixedly connected to the sliding sleeve (401); the two electric telescopic rods (402) are respectively fixedly connected to both sides of the welding body (301); two adjusting shafts (403), which are respectively fixedly connected to both sides of the bottom of the sliding sleeve (401); the bottom of the two adjusting shafts (403) is fitted with a ball bearing; the protective device (5) includes: a guard plate. The drive threaded rod (501) and the rotating shaft of the drive threaded rod (501) are connected to two rod holders (502); the drive threaded rod (501) has reverse threads on both sides; there are two rod holders (502), and the two rod holders (502) are respectively fixedly connected to two adjusting shafts (403); the two guard plates (503) are respectively threaded and rotatably connected to the two ends of the drive threaded rod (501); the two guard plates (503) are slidably connected between the two rod holders (502) through a sliding shaft; the dust removal device (6) includes: an air nozzle (601), which is fixedly connected to the two adjusting shafts (403) through a bracket; and an air pump (602), which is fixedly connected to the positioning slide plate (201);An air pump (602) is connected to an air nozzle (601); the operating device (7) includes: an operating bracket (701), which is fixedly connected to the mounting base plate (101); operating rollers (702), which are arranged in a row, and the rotating shafts of the row of operating rollers (702) are respectively connected to the operating bracket (701); a gear is provided at the top of each row of operating rollers (702); and a drive threaded rod (703), which is fixedly connected to the operating bracket. (701) and the drive threaded rod (703) is meshed with gears provided on the top of a row of running rollers (702); the contraction structure (8) includes: a contraction fixing plate (801), which is fixedly connected to the mounting base plate (101); a contraction roller frame (802), which is slidably connected to the contraction fixing plate (801) through a sliding shaft, and a spring is fitted on the sliding shaft; a row of push rollers is connected to the rotating shaft on the contraction roller frame (802).

2. The welding method using the narrow gap welding apparatus according to claim 1, characterized in that: The steps are as follows: 1) Place the welding plate (9) on top of the mounting base plate (101), and drive the adjusting positioning slide plate (201) by rotating the drive screw (202) to move the floating welding part (3) to position the weld. 2) The row of running rollers (702) on the set running device (7) is driven by the drive threaded rod (703) to move and drive the welding plate (9) forward. During the process, the set shrinking roller frame (802) squeezes the welding plate (9) under the spring compression. The two electric telescopic rods (402) on the set adjustment part (4) drive the two adjusting shafts (403) at the bottom of the sliding sleeve frame (401) to control the height difference between the adjusting shaft (403) and the welding body (301) and adjust the welding depth of the welding body (301). 3) The dust removal device (6) can effectively blow high-pressure gas into the weld seam of the welding plate (9) through the air nozzle (601).

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