Argon filling device for pipe fitting welding training

Abstract

The utility model provides an argon filling device for pipe fitting welding training. Comprising a stand column, an adjusting assembly, a test piece fixing sealing block and a test piece jacking sealing block, the adjusting assembly is assembled on the stand column and provided with a longitudinal lifting sleeve and a transverse fixing sleeve. The longitudinal lifting sleeve is used for longitudinally adjusting the height; the transverse fixing sleeve perpendicularly intersects with the longitudinal lifting sleeve and is used for transversely adjusting the distance. One end of the test piece fixing and sealing block is connected with one transverse fixing sleeve, and a to-be-welded test piece is inserted into the other end; the test piece fixing and sealing block is provided with an argon filling pipe; one end of the test piece jacking sealing block is connected with the other transverse fixing sleeve, and the other end of the test piece jacking sealing block is inserted into the other end of the to-be-welded test piece and is combined with the test piece fixing sealing block to seal and fix the to-be-welded test piece; the test piece jacking sealing block is provided with a deflation pipe. Argon filling protection is carried out in the to-be-welded test piece, it is guaranteed that welding seams and near-seam areas in the to-be-welded test piece are not oxidized, the welding seam quality is not affected, the welding seam quality reaches the standard, and the welding training efficiency is improved. The argon filling device is suitable for pipe fitting welding training.

Description

Technical Field

[0001] This utility model relates to practical welding training for welders in the field of welding, and in particular to an argon purging device for training in pipe welding. Background Technology

[0002] Currently, pipeline welding is widely used in shipbuilding, petrochemicals, aerospace, nuclear industry, power, construction, and machinery manufacturing. Pipeline welding technology is an essential processing method in these fields, but there is a current shortage of human resources for pipeline welding, especially for highly skilled personnel with specific skill requirements. Practical training for pipe welders primarily involves basic welding skills training using standard pipe fittings. However, when training for non-consumable electrode gas shielded welding of some non-ferrous metal pipe fittings, if argon purging is not performed inside the fitting, oxidation easily occurs in the weld and near-weld zone, affecting weld quality. Therefore, argon purging is necessary.

[0003] However, in the process of implementing the inventive technical solution in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems:

[0004] Currently, the argon purging methods used in training non-ferrous metal pipe fittings for non-consumable electrode gas shielded welding are outdated and ineffective. In particular, one particular argon purging device was not used during the training process.

[0005] Therefore, it is crucial to bridge the final "mile" in the training of welders for non-ferrous metal pipeline systems. This can be achieved by constructing an argon-filling training device for pipe welding, enriching the means of improving welders' skill levels, further enhancing the effectiveness of welder training, and reducing product quality risks. An argon-filling training device for pipe welding is urgently needed. Summary of the Invention

[0006] To address the shortcomings of existing technologies and improve the efficiency of pipe welding training while reducing product construction quality risks, this application provides an argon-filling device for pipe welding training. This device, by setting a specimen fixing sealing block and a specimen clamping sealing block at both ends of the specimen to be welded, and then purging with argon, ensures that oxidation does not occur in the weld seam and near-weld area inside the specimen, thus preventing damage to weld quality. This solves the technical problem that oxidation easily occurs in the weld seam and near-weld area of ​​non-consumable electrode gas shielded welding specimens during non-consumable electrode gas shielded welding training, resulting in substandard weld quality.

[0007] The solution adopted by the embodiments of this application to solve the technical problem is:

[0008] An argon purging device for training pipe welding includes a column, an adjustment assembly, a specimen fixing sealing block, and a specimen tightening sealing block;

[0009] The column is used to fix the device on the operating platform; the adjustment assembly is mounted on the column and has a longitudinal lifting sleeve and a transverse fixing sleeve; the longitudinal lifting sleeve is used for longitudinal height adjustment; the transverse fixing sleeve intersects the longitudinal lifting sleeve perpendicularly and is used for transverse locking and fixing; one end of the specimen fixing sealing block is connected to a transverse fixing sleeve, and the other end is inserted into the specimen to be welded, which is used to seal and clamp the end of the specimen to be welded; the specimen fixing sealing block has an argon filling tube; one end of the specimen tightening sealing block is connected to another transverse fixing sleeve, and the other end is inserted into the other end of the specimen to be welded, which, together with the specimen fixing sealing block, seals and fixes the specimen to be welded; the specimen tightening sealing block has a venting tube;

[0010] One end of the test piece to be welded is inserted into the test piece fixing sealing block, and the other end is inserted into the test piece and pressed against the sealing block. The test piece to be welded is sealed and clamped between the two columns and the adjusting components by pressing the test piece against the sealing block, and argon is used to protect the inside of the test piece to be welded.

[0011] In order to further solve the technical problems to be solved by the embodiments of this application, the specimen fixing sealing block provided in the embodiments of this application includes a fixing sealing plug and a connecting rod;

[0012] The fixed sealing plug is a cylindrical structure with a sealed bottom. A fixed groove is provided in the open inner cavity of the fixed sealing plug for inserting one end of the test piece to be welded. A fixed sealing gasket is provided at the bottom of the fixed groove for sealing the end of the test piece to be welded. A hole is opened on the sealed bottom of the fixed sealing plug, and an argon filling tube is welded to the hole and extends outward through the hole to connect with the argon gas source.

[0013] The connecting rod is located on the outside of the bottom of the fixed sealing plug. It is used to insert the corresponding transverse sleeve and connect with the adjustment component, and to lock and fix the specimen fixing sealing block by transverse fixing bolts.

[0014] Furthermore, the specimen clamping sealing block includes a clamping sealing plug, a telescopic shaft, and a connecting pipe;

[0015] The top-tightening sealing plug is a cylindrical structure with a sealed bottom. A top-tightening groove is provided in the open inner cavity of the top-tightening sealing plug for inserting the other end of the test piece to be welded. A top-tightening sealing gasket is provided at the bottom of the top-tightening groove for sealing the end of the test piece to be welded. A through hole is opened on the sealed bottom of the top-tightening sealing plug, and a venting pipe is welded to the through hole. A venting valve is provided on the venting pipe.

[0016] The telescopic shaft is round, with one end connected to the outer side of the bottom of the sealing plug and welded to the sealing plug; the other end of the telescopic shaft is equipped with a telescopic spring, which allows the telescopic shaft to extend and retract for axial tightening. A telescopic shaft retaining ring is provided inside the telescopic spring for limiting and fixing.

[0017] One end of the connecting pipe is inserted into the telescopic shaft, and the other end is inserted into the corresponding transverse sleeve and connected to the adjustment component. The specimen fixing sealing block is locked and fixed by the transverse fixing bolt. A shaft end retaining ring is set at the end of the connecting pipe, and a limit ring is set in the inner cavity of the connecting pipe. The shaft end retaining ring and the limit ring limit the telescopic spring and the telescopic shaft retaining ring.

[0018] Positive effects:

[0019] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0020] 1. Because the embodiments of this application adopt the technical means of setting a specimen fixing sealing block and a specimen tightening sealing block at both ends of the specimen to be welded, with an argon filling tube on the specimen fixing sealing block and a venting tube on the specimen tightening sealing block, after the specimen to be welded is tightly clamped by the specimen fixing sealing block and the specimen tightening sealing block, argon is filled inside the specimen to be welded through the argon filling tube for protection, which effectively solves the technical problem of oxidation of the weld and near-weld area inside the specimen to be welded in the prior art, thereby achieving the technical effect of weld quality meeting the standard.

[0021] 2. Because the embodiments of this application adopt the technical means of adjusting the components and mounting them on the column, and clamping the test piece to be welded between the two adjusting components by the test piece fixing sealing block and the test piece pressing sealing block, the height of the test piece to be welded can be adjusted by adjusting the components, which is convenient for welding operation and observation. This effectively solves the technical problem of arbitrarily adjusting the height of the test piece to be welded in the prior art, and thus achieves the technical effect of meeting the welding training needs.

[0022] 3. As this application embodiment adopts the technical means of clamping and fixing the test piece to be welded by the test piece fixing sealing block and the test piece tightening sealing block, the test piece tightening sealing block has a telescopic spring, which can axially compress the test piece to be welded, effectively solving the technical problem of easy disassembly and easy replacement of the test piece to be welded in the prior art, thereby achieving the technical effect of meeting the needs of welding training work.

[0023] 4. Since the embodiments of this application adopt the technical means of setting a vent pipe on the top sealing plug and installing a vent valve on the vent pipe, the technical problem of effectively controlling the purity of argon gas inside the test piece to be welded by the vent valve in the prior art is effectively solved, thereby achieving the technical effect of simple and convenient operation and good argon filling effect.

[0024] It is suitable for use as an argon purging device for training in pipe welding. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure in this embodiment;

[0027] Figure 2 A schematic diagram of the sealing block structure for fixing the specimen;

[0028] Figure 3 This is a schematic diagram of the structure of the sealing block for tightening the specimen.

[0029] In the picture:

[0030] 100. Column;

[0031] 200. Adjust components,

[0032] 210. Longitudinal lifting sleeve,

[0033] 211. Longitudinal sleeve,

[0034] 212. Longitudinal fixing bolts,

[0035] 220. Horizontal fixing sleeve,

[0036] 221. Horizontal sleeve,

[0037] 222. Horizontal fixing bolts;

[0038] 300. Specimen fixing sealing block,

[0039] 310. Fix the sealing plug,

[0040] 311. Fixed card slot,

[0041] 312. Fix the sealing gasket,

[0042] 313. Argon filling tube,

[0043] 320. Connecting rod;

[0044] 400. Tighten the specimen against the sealing block.

[0045] 410. Tighten the sealing plug.

[0046] 411. Tighten the locking slot.

[0047] 412. Tighten the sealing gasket.

[0048] 413. Venting pipe,

[0049] 414. Vent valve,

[0050] 420. Telescopic shaft,

[0051] 430. Connecting pipe,

[0052] 440. Extension spring,

[0053] 450. Telescopic shaft retaining ring,

[0054] 460. Shaft end retaining ring,

[0055] 470. Limiting ring;

[0056] 500. Test piece to be welded. Detailed Implementation

[0057] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0058] This application provides an argon-filling device for pipe welding training, which solves the problem in the prior art where non-ferrous metal test pieces 500 are prone to oxidation in the weld seam and near-weld area during non-consumable electrode gas shielded welding training, resulting in substandard weld quality. In this argon-filling device for pipe welding training, the test piece 500 is sealed and clamped by the test piece fixing sealing block 300 and the test piece pressing sealing block 400, and protected by argon filling, thus preventing oxidation in the weld seam and near-weld area of ​​the test piece 500 and thus ensuring weld quality.

[0059] As shown in the attached drawings of the specification, an argon filling device for pipe welding training includes a column 100, an adjustment assembly 200, a specimen fixing sealing block 300, and a specimen tightening sealing block 400.

[0060] The column 100 is a rod-shaped structure with a base, used to fix the device to the operating platform;

[0061] The adjustment component 200 is mounted on the column 100 and has a longitudinal lifting sleeve 210 and a transverse fixing sleeve 220. The longitudinal lifting sleeve 210 is mounted on the column 100 and is used for longitudinal height adjustment. The transverse fixing sleeve 220 intersects the longitudinal lifting sleeve 210 perpendicularly and is used for transverse locking and fixing.

[0062] One end of the specimen fixing sealing block 300 is connected to a transverse fixing sleeve 220, and the other end is inserted into the specimen to be welded 500, which is used to seal and clamp the end of the specimen to be welded 500; the specimen fixing sealing block 300 has an argon filling tube 313 for inputting argon gas for welding protection.

[0063] One end of the specimen clamping sealing block 400 is connected to another transverse fixing sleeve 220, and the other end is inserted into the other end of the specimen to be welded 500. Together with the specimen fixing sealing block 300, the specimen to be welded 500 is sealed and fixed. The specimen clamping sealing block 400 has a vent pipe 413 for venting argon gas.

[0064] In this process, one end of the test piece 500 is inserted into the test piece fixing sealing block 300, and the other end is inserted into the test piece and tightened against the sealing block 400. The test piece 500 is then clamped between the two columns 100 and the adjusting assembly 200 by tightening the test piece against the sealing block 400. Argon purging is applied to the inside of the test piece 500 for welding training, which effectively ensures that the weld and near-weld area inside the test piece 500 do not oxidize and affect the weld quality, thereby achieving the weld quality standard and improving the efficiency of welding training.

[0065] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0066] Since a specimen fixing sealing block 300 and a specimen tightening sealing block 400 are respectively set at both ends of the specimen to be welded 500, and an argon filling pipe 313 is provided on the specimen fixing sealing block 300 and a venting pipe 413 is provided on the specimen tightening sealing block 400, after the specimen to be welded 500 is tightly clamped by the specimen fixing sealing block 300 and the specimen tightening sealing block 400, the specimen to be welded 500 is protected by argon filling through the argon filling pipe 313. This can ensure that the weld and near-weld area inside the specimen to be welded 500 do not oxidize, thus avoiding substandard weld quality.

[0067] Since the adjustment component 200 is mounted on the column 100, the test piece 500 to be welded is clamped between the two adjustment components 200 by the test piece fixing sealing block 300 and the test piece tightening sealing block 400. Therefore, the height of the test piece 500 to be welded can be adjusted by the adjustment component 200, which facilitates welding operation and observation, meets the welding training needs, and allows for arbitrary adjustment of the height of the test piece 500 to be welded.

[0068] To ensure the stability of the structure in this embodiment, the longitudinal lifting sleeve 210 includes a longitudinal sleeve 211 and a longitudinal fixing bolt 212;

[0069] The longitudinal sleeve 211 has a hollow structure and slides on the column 100, allowing for height adjustment. A longitudinal fixing bolt 212 is provided on the side of the longitudinal sleeve 211, which is used to fix the longitudinal lifting sleeve 210 to the column 100.

[0070] The transverse fixing sleeve 220 includes a transverse sleeve 221 and a transverse fixing bolt 222;

[0071] The transverse sleeve 221 is also a hollow structure, which is horizontally welded to the middle of the longitudinal lifting sleeve 210 and is used to assemble the specimen fixing sealing block 300 or the specimen tightening sealing block 400. The transverse sleeve 221 is equipped with transverse fixing bolts 222, which are used to lock and fix the specimen fixing sealing block 300 or the specimen tightening sealing block 400.

[0072] To further ensure the stability of the structure in this embodiment, the specimen fixing sealing block 300 includes a fixing sealing plug 310 and a connecting rod 320;

[0073] The fixed sealing plug 310 is a cylindrical structure with a sealed bottom. A fixed groove 311 is provided in the open inner cavity of the fixed sealing plug 310 for inserting one end of the test piece 500 to be welded. A fixed sealing gasket 312 is provided at the bottom of the fixed groove 311 for sealing the end of the test piece 500 to be welded. A hole is opened on the sealed bottom of the fixed sealing plug 310. An argon filling tube 313 is welded to the hole and extends outward through the hole to connect with the argon gas source.

[0074] The connecting rod 320 is located on the outside of the bottom of the fixed sealing plug 310. It is used to insert the corresponding transverse sleeve 221 and connect it to the adjustment assembly 200. The test piece fixing sealing block 300 is locked and fixed by the transverse fixing bolt 222.

[0075] To optimize the structure of this embodiment, the specimen clamping sealing block 400 includes a clamping sealing plug 410, a telescopic shaft 420, and a connecting pipe 430.

[0076] The top-tightening sealing plug 410 is a cylindrical structure with a sealed bottom. A top-tightening groove 411 is provided in the open inner cavity of the top-tightening sealing plug 410 for inserting the other end of the test piece 500 to be welded. A top-tightening sealing gasket 412 is provided at the bottom of the top-tightening groove 411 for sealing the end of the test piece 500 to be welded. A through hole is opened on the sealed bottom of the top-tightening sealing plug 410. A vent pipe 413 is welded to the through hole and extends outward through the through hole to discharge argon gas. A vent valve 414 is provided on the vent pipe 413 to control the purity of argon gas inside the test piece 500 to be welded, so that welding training can be carried out in an orderly manner when the purity of argon gas is appropriate.

[0077] The telescopic shaft 420 is round. One end of it is connected to the outer side of the bottom of the sealing plug 410 and welded to the sealing plug 410. The other end of the telescopic shaft 420 is equipped with a telescopic spring 440, which allows the telescopic shaft 420 to extend and retract for axial tightening. The telescopic spring 440 is provided with a telescopic shaft retaining ring 450 inside for limiting and fixing.

[0078] One end of the connecting pipe 430 is inserted into the telescopic shaft 420, and the other end is inserted into the corresponding transverse sleeve 221 and connected to the adjustment assembly 200. The specimen fixing sealing block 300 is locked and fixed by the transverse fixing bolt 222. A shaft end retaining ring 460 is provided at the end of the connecting pipe 430, and a limit ring 470 is provided in the inner cavity of the connecting pipe 430. The shaft end retaining ring 460 and the limit ring 470 limit the telescopic spring 440 and the telescopic shaft retaining ring 450, so that the elastic force of the telescopic spring 440 fixes the specimen to be welded 500 between the specimen fixing sealing block 300 and the specimen pressing sealing block 400.

[0079] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0080] Since the test piece 500 to be welded is clamped and fixed by the test piece fixing sealing block 300 and the test piece tightening sealing block 400, and the test piece tightening sealing block 400 has a telescopic spring 440, the test piece tightening sealing block 400 can axially compress the test piece 500 to be welded. Therefore, the test piece 500 to be welded is easy to disassemble and can be replaced at will, which meets the needs of welding training.

[0081] Because a vent pipe 413 is provided on the top sealing plug 410, and a vent valve 414 is installed on the vent pipe 413; therefore, the purity of argon gas inside the test piece 500 to be welded can be effectively controlled by the vent valve 414, which is simple and convenient to operate and has a good argon filling effect.

[0082] The working process of this embodiment:

[0083] First, adjust the two longitudinal lifting sleeves 210 of the adjustment assembly 200 on the column 100 to the same adaptive height according to the welding training height requirements. Then, fix the adjustment assembly 200 on the column 100 with the longitudinal fixing bolts 212 and determine the distance between the two columns 100 to adapt to the test piece 500 to be welded.

[0084] Next, the connecting rod 320 of the fixed sealing plug 310 is inserted into the transverse fixing sleeve 220 of one of its adjustment components 200, and the connecting rod 320 is fastened to the transverse sleeve 221 by the transverse fixing bolt 222;

[0085] Next, the connecting pipe 430 of the specimen pressing against the sealing block 40 is inserted into the transverse fixing sleeve 220 of another adjustment component 200, and the connecting pipe 430 is fastened to the transverse sleeve 221 by the transverse fixing bolt 222;

[0086] Secondly, one end of the test piece 500 to be welded is inserted into the fixing slot 311 of the fixing sealing plug 310, and the test piece is squeezed to tighten the sealing block 400 to shrink it. The other end of the test piece 500 to be welded is inserted into the tightening slot 411 of the tightening sealing plug 410. The elastic force of the telescopic spring 440 squeezes the test piece 500 to be welded, sealing it between the test piece fixing sealing block 300 and the test piece tightening sealing block 400.

[0087] Secondly, argon is purged into the interior of the test piece 500 using the argon filling tube 313 on the fixed sealing plug 310;

[0088] Finally, the purity of argon gas inside the test piece 500 is controlled by the venting valve 414 installed on the venting pipe 413 that tightens the sealing plug 410. When the argon gas purity is suitable, welding training is carried out in an orderly manner.

[0089] It is worth noting that all contents not described in detail in the specification are existing technologies known to those skilled in the art, and the model parameters of the telescopic spring 440 are not specifically limited, and conventional technologies can be used for selection. Electrical control components not mentioned in this technical solution are existing technologies and are therefore not shown in the figures, and will not be described here.

[0090] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An argon-filling device for pipe welding training, characterized in that: include: A column (100) is used to fix the device on the operating platform; An adjustment assembly (200) is mounted on the column (100) and has a longitudinal lifting sleeve (210) and a transverse fixing sleeve (220); the longitudinal lifting sleeve (210) is used for longitudinal height adjustment; the transverse fixing sleeve (220) intersects the longitudinal lifting sleeve (210) perpendicularly and is used for transverse locking and fixing. A specimen fixing sealing block (300) is provided, one end of which is connected to a transverse fixing sleeve (220), and the other end of which is inserted into the specimen to be welded (500) for sealing and clamping the end of the specimen to be welded (500); the specimen fixing sealing block (300) has an argon filling tube (313); and The specimen is tightened against the sealing block (400), one end of which is connected to another transverse fixing sleeve (220), and the other end is inserted into the other end of the specimen to be welded (500), which, together with the specimen fixing sealing block (300), seals and fixes the specimen to be welded (500); the specimen tightening sealing block (400) has a vent pipe (413). One end of the test piece (500) to be welded is inserted into the test piece fixing sealing block (300), and the other end is inserted into the test piece tightening sealing block (400). The test piece (500) to be welded is closed and clamped between the adjustment components (200) on the two columns (100) by the test piece tightening sealing block (400), and argon filling protection is implemented inside the test piece (500).

2. The argon purging device for pipe welding training according to claim 1, characterized in that: The longitudinal lifting sleeve (210) includes a longitudinal sleeve (211) and a longitudinal fixing bolt (212). The longitudinal sleeve (211) slides on the column (100) and can be raised and lowered to adjust its height. The longitudinal fixing bolt (212) is provided on the side of the longitudinal sleeve (211) and the longitudinal lifting sleeve (210) is fixed on the column (100) by the longitudinal fixing bolt (212).

3. The argon purging device for pipe welding training according to claim 1, characterized in that: The transverse fixing sleeve (220) includes a transverse sleeve (221) and a transverse fixing bolt (222); The transverse sleeve (221) is horizontally welded to the middle of the longitudinal lifting sleeve (210) for assembling the specimen fixing sealing block (300) or the specimen tightening sealing block (400); the transverse sleeve (221) is provided with the transverse fixing bolt (222), and the specimen fixing sealing block (300) or the specimen tightening sealing block (400) is locked and fixed by the transverse fixing bolt (222).

4. The argon purging device for pipe welding training according to claim 3, characterized in that: The specimen fixing sealing block (300) includes: A fixed sealing plug (310) is a cylindrical structure with a sealed bottom. A fixed groove (311) is provided in the open inner cavity of the fixed sealing plug (310) for inserting one end of the test piece (500) to be welded. A fixed sealing gasket (312) is provided at the bottom of the fixed groove (311) for sealing the end of the test piece (500). A hole is opened in the sealed bottom of the fixed sealing plug (310), and an argon filling tube (313) is welded to the hole and extends outward through the hole to connect with an argon gas source. The connecting rod (320) is located on the outside of the bottom of the fixed sealing plug (310) and is used to insert the corresponding transverse sleeve (221) to connect with the adjustment assembly (200) and to lock the specimen fixing sealing block (300) by the transverse fixing bolt (222).

5. The argon purging device for pipe welding training according to claim 3, characterized in that: The test piece is tightened against the sealing block (400), which includes: A top-tightening sealing plug (410) is a cylindrical structure with a sealed bottom. A top-tightening groove (411) is provided in the open inner cavity of the top-tightening sealing plug (410) for inserting the other end of the test piece (500) to be welded. A top-tightening sealing gasket (412) is provided at the bottom of the top-tightening groove (411) for sealing the end of the test piece (500) to be welded. A through hole is opened on the sealed bottom of the top-tightening sealing plug (410), and a venting pipe (413) is welded to the through hole. A venting valve (414) is provided on the venting pipe (413). A telescopic shaft (420) is a round shaft, one end of which is connected to the outer side of the bottom of the tightening sealing plug (410) and welded to the tightening sealing plug (410); the other end of the telescopic shaft (420) is equipped with a telescopic spring (440), which allows the telescopic shaft (420) to extend and retract for axial tightening; a telescopic shaft retaining ring (450) is provided inside the telescopic spring (440) for limiting and fixing; and A connecting pipe (430) is inserted into the telescopic shaft (420) at one end and into the corresponding transverse sleeve (221) at the other end, which is connected to the adjusting assembly (200). The specimen fixing sealing block (300) is locked and fixed by the transverse fixing bolt (222). A shaft end retaining ring (460) is provided at the end of the connecting pipe (430), and a limit ring (470) is provided in the inner cavity of the connecting pipe (430). The shaft end retaining ring (460) and the limit ring (470) limit the telescopic spring (440) and the telescopic shaft retaining ring (450).

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