CN211727844U - Flat plate straight seam welding test fixture - Google Patents

Abstract

The utility model discloses a dull and stereotyped transversal joint welding test anchor clamps belongs to the welding jig field. The flat plate straight seam welding test fixture comprises a bottom plate, a first base plate, a pressing plate assembly, a clamping assembly and a lifting assembly; the pressure plate assembly comprises a first pressure plate and a second pressure plate; the first base plate is arranged in the middle of the bottom plate and provided with a strip-shaped groove; the lifting assembly comprises a bearing seat, a rotating shaft arranged on the bearing seat, a cam sleeved on the rotating shaft and a handle fixedly arranged on the rotating shaft, wherein the mounting surface of the bearing seat is connected with the side end surface of the bottom plate, and the distance between the rotating axis of the rotating shaft and the mounting surface is larger than the base radius of the cam; the diameter of the base circle of the cam is less than or equal to the thickness of the bottom plate; when the handle control cam rotates around the rotating shaft, the pressing plate assembly is close to or far away from the bottom plate, the clamp is switched between a loading and unloading state and a clamping state, and the clamping assembly is used for clamping a workpiece between the pressing plate assembly and the bottom plate; the clamp can improve the convenience of clamping and disassembling the workpiece and can realize single-person operation.

Description

Flat plate straight seam welding test fixture

Technical Field

The utility model relates to a welding jig especially relates to a dull and stereotyped transversal joint welding test anchor clamps.

Background

At present, a flat plate straight seam welding test is the most basic and common test mode in metal material research and development and component welding process tests. The accuracy of the test result is closely related to the welding clamping condition of the test piece, repeatable clamping and welding states are the premise of obtaining accurate data, and rapid clamping is beneficial to improving the test efficiency.

The flat plate straight seam welding test fixture in the prior art has the following defects: when the workpiece is clamped, the operation is complex, the cooperation of multiple persons is needed, and the working efficiency is low.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a flat plate straight seam welding test fixture capable of realizing single-person operation.

The purpose of the utility model is realized by adopting the following technical scheme:

a flat plate straight seam welding test fixture comprises a bottom plate, a first base plate, a pressing plate assembly, a clamping assembly and a lifting assembly; the pressure plate assembly comprises a first pressure plate and a second pressure plate, and the pressure plate assembly is movably connected with the bottom plate; the first base plate is arranged in the middle of the bottom plate and provided with a strip-shaped groove;

the lifting assembly comprises a bearing seat, a rotating shaft arranged on the bearing seat, a cam sleeved on the rotating shaft and a handle fixedly arranged on the rotating shaft, the mounting surface of the bearing seat is connected with the side end surface of the bottom plate, and the distance between the rotating axis of the rotating shaft and the mounting surface is larger than the base radius of the cam; the diameter of the base circle of the cam is smaller than or equal to the thickness of the base plate;

the clamp has a loading and unloading state and a clamping state; when the clamp is in the assembling and disassembling state, the cam abuts against the pressure plate assembly, so that a space for assembling and disassembling a workpiece to be welded is formed between the pressure plate assembly and the bottom plate, and the cam abuts against the side end face of the bottom plate; when the clamp is in the clamping state, the pressure plate assembly abuts against a workpiece, and the clamping assembly is used for clamping the workpiece between the pressure plate assembly and the bottom plate; the handle is used for driving the cam to rotate around the rotating axis, so that the clamp is switched between the assembling and disassembling state and the clamping state.

Further, the bearing seat is provided with a first mounting hole, the rotating shaft is mounted in the first mounting hole, the central axis of the first mounting hole is the rotating axis of the rotating shaft, and the distance between the central axis and the mounting surface is larger than the base radius of the cam.

Furthermore, the number of the lifting assemblies is two, and the two lifting assemblies are respectively arranged on the end surfaces of two opposite sides of the bottom plate; two cams are arranged on the rotating shaft of each lifting assembly at intervals; when the rotating shaft of each lifting assembly rotates, one cam is used for enabling the first pressure plate to be lifted or lowered, and the other cam is used for enabling the second pressure plate to be lifted or lowered;

the interval between the adjacent cams of one lifting assembly is a first interval, the interval between the adjacent cams of the other lifting assembly is a second interval, the second interval is larger than the first interval, and the second interval is used for clamping and disassembling workpieces.

Furthermore, the lengths of the first pressing plate and the second pressing plate are both longer than the length of the bottom plate, so that the first pressing plate and the second pressing plate are pushed by the cam to lift the pressing plate assembly.

Further, the bottom plate is provided with a mounting groove, and the first backing plate is embedded in the mounting groove.

Further, the clamping assembly comprises a connecting bolt and a connecting nut;

the two sides of the mounting groove of the base plate are respectively provided with a first through hole, the first pressing plate and the second pressing plate are respectively provided with a second through hole, the connecting bolt penetrates through the first through hole and the second through hole, and the connecting nut is in threaded connection with the connecting bolt so as to clamp a workpiece to be welded between the pressing plate assembly and the base plate.

Further, the first through hole is a through hole with a counter bore.

Furthermore, two rows of through holes are symmetrically arranged on two sides of the mounting groove of the bottom plate, and each row of through holes comprises a plurality of first through holes which are arranged at intervals along the length direction of the bottom plate; the first pressing plate is provided with a plurality of second through holes at intervals along the length direction; a plurality of second through holes are arranged at intervals along the length direction of the second pressing plate;

each second through hole comprises a plurality of communicated round holes.

The second base plate is as thick as the workpiece to be welded and clamped between the pressure plate assembly and the base plate, and the arc striking plate and the arc quenching plate are arranged on the base plate;

the distance between the central axis and the mounting surface is L, the radius of the cam base circle is R, and the L-R/R is more than or equal to 0.15 and less than or equal to 0.3.

Further, the device also comprises a lateral connecting piece;

lateral threaded holes are respectively formed in the side end faces of the two sides of the bottom plate in the length direction, a second mounting hole is formed in the mounting face of the bearing seat, and the lateral connecting piece penetrates through the second mounting hole and the lateral threaded holes to fix the bearing seat on the bottom plate.

Compared with the prior art, the beneficial effects of the utility model reside in that: can realize one-man operation, low manufacturing cost and high working efficiency.

Drawings

FIG. 1 is a view showing one of the structural diagrams of the flat plate butt welding test jig of the present invention in a loading/unloading state;

FIG. 2 is a second structural diagram of the flat plate butt welding test fixture in a loading/unloading state according to the present invention;

FIG. 3 is one of the structural diagrams of the flat plate straight seam welding test fixture in the clamping state according to the present invention;

FIG. 4 is a second structural diagram of the flat plate straight seam welding test fixture in the clamping state according to the present invention;

FIG. 5 is a third structural diagram of the flat plate straight seam welding test fixture in the clamping state according to the present invention;

fig. 6 is one of the schematic structural diagrams of the bottom plate of the present invention;

fig. 7 is a second schematic structural view of the bottom plate of the present invention;

fig. 8 is a schematic structural view of the platen assembly of the present invention;

fig. 9 is a schematic structural view of the first pad of the present invention;

fig. 10 is a schematic structural view of the lifting assembly of the present invention;

fig. 11 is a schematic structural view of the cam of the present invention;

fig. 12 is a schematic structural view of a bearing seat of the present invention;

in the figure: 10. a base plate; 11. mounting grooves; 12. a first through hole; 13. a lateral threaded hole; 20. a first backing plate; 21. a strip-shaped groove; 30. a platen assembly; 301. a second through hole; 31. a first platen; 32. a second platen; 40. a clamping assembly; 41. a connecting bolt; 42. a connecting nut; 50. a lifting assembly; 51. a bearing seat; 511. a mounting surface; 512. a first mounting hole; 513. a second mounting hole; 52. a rotating shaft; 53. a cam; 54. a handle; 61. a second backing plate; 62. an arc striking plate; 63. an arc extinguishing plate; 90. and (5) a workpiece.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

As shown in fig. 1 to 12, the present embodiment provides a flat plate straight seam welding test jig, which can be used for a straight seam welding test of a flat plate having a thickness of 10mm or less, and includes a base plate 10, a first backing plate 20, a pressing plate assembly 30, a clamping assembly 40, and a lifting assembly 50; the pressure plate assembly 30 comprises a first pressure plate 31 and a second pressure plate 32, the pressure plate assembly 30 is movably connected with the base plate 10, the lifting assembly 50 is used for adjusting the height of the pressure plate assembly 30 to realize the lifting, supporting and falling of the pressure plate assembly 30, so that the distance between the pressure plate assembly 30 and the base plate 10 is adjusted, a workpiece 90 to be welded is conveniently installed between the pressure plate assembly 30 and the base plate 10 from the side direction, or the pressure plate assembly 30, the workpiece 90 and the base plate 10 are stacked in sequence, so that the workpiece 90 to be welded is clamped between the pressure plate assembly 30 and the base plate 10 through the clamping assembly 40 for welding; in this embodiment, the first backing plate 20 is a copper first backing plate 20, the first backing plate 20 is disposed in the middle of the bottom plate 10, the first backing plate 20 is provided with a strip-shaped groove 21, and the strip-shaped groove 21 is a forming groove or a back protection groove according to the material of the test workpiece 90.

Specifically, the lifting assembly 50 includes a bearing seat 51, a rotating shaft 52 disposed on the bearing seat 51, a cam 53 sleeved on the rotating shaft 52, a handle 54 fixedly disposed on the rotating shaft 52, a snap spring, a flat key and other standard components; the diameter of the base circle of the cam 53 is less than or equal to the thickness of the base plate 10; the bearing seat 51 has a mounting surface 511, the mounting surface 511 of the bearing seat 51 is connected with a side end surface of the bottom plate 10, and it should be noted that, in the present embodiment, the side end surface is a side end surface of the bottom plate 10 when the jig is in a normal use state; the cam 53 has a base circular surface and a profile surface protruding relative to the base circular surface, and the distance between the rotating axis O' of the rotating shaft 52 and the mounting surface 511 of the bearing seat 51 is larger than the base circular radius of the cam 53; the clamp of the embodiment has a detachable state and a clamping state; as shown in fig. 1 and 2, when the fixture is in a loading and unloading state, the contour surface of the cam 53 abuts against the pressure plate assembly 30, so that a space for loading and unloading a workpiece 90 to be welded is formed between the pressure plate assembly 30 and the bottom plate 10, and the cam 53 laterally abuts against the side end surface of the bottom plate 10; as shown in fig. 3, 4 and 5, when the clamp is in the clamping state, the platen assembly 30 abuts against the workpiece 90, and the clamping assembly 40 is used for clamping the workpiece 90 between the platen assembly 30 and the base plate 10; the handle 54 is used to rotate the cam 53 about the rotation axis O' so as to switch the clamp between the loading and unloading state and the clamping state.

Preferably, as shown in fig. 2, 4, 10 and 12, the bearing seat 51 has a first mounting hole 512, the rotating shaft 52 is mounted in the first mounting hole 512, a central axis O 'of the first mounting hole 512 is a rotation axis O' of the rotating shaft 52, a distance L between the central axis O 'and the mounting surface 511 is greater than a base radius of the cam 53, and a center of a base circle of the cam 53 is located on the central axis O'; through the arrangement, when the clamp is in a loading and unloading state, the top end of the profile surface of the cam 53 crosses the vertical reference line passing through the center of the base circle of the cam 53, the profile surface of the cam 53 abuts against the side end surface of the base plate 10, so that the cam 53 is prevented from being turned over and rotated in the direction away from the base plate 10, at the moment, an operator is not required to apply holding force to the lifting assembly 50 to keep the relative position of the cam 53, the clamp can also be kept in the loading and unloading state, when a test is carried out, the lifting assembly 50 is not required to be specially operated by one person, the test workpiece 90 is specially placed by one.

Preferably, in this embodiment, as shown in fig. 4, 10 and 12, the distance from the central axis O' of the first mounting hole 512 to the mounting surface 511 is L, the radius of the base circle of the cam 53 is R, and in order to ensure the stability of the clamp in the loading and unloading state during the process, the clamp can be operated by one person, and the ratio of (L-R)/R is more than or equal to 0.15 and less than or equal to 0.3.

In this embodiment, the lifting assembly 50 is configured to: the distance between the rotating axis O' of the rotating shaft 52 and the mounting surface 511 of the bearing seat 51 is larger than the base circle diameter of the cam 53; in this way, after the cam 53 rotates around the rotation axis O' to push the pressing plate assembly 30 to the high position through the profile surface of the cam 53, the cam 53 can be laterally supported by the side end surface of the base plate 10, so that the cam 53 can be kept at the current position to keep the pressing plate assembly 30 at the high position, so that the clamp is in a loading and unloading state, thereby facilitating an operator to release the handle 54 for loading and unloading the workpiece 90; through the size of reasonable design cam 53 and bearing frame 51, can be so that experimental one-man operation for the operation process of the repeatedly clamping of anchor clamps is more convenient, is favorable to improving work efficiency. By setting the diameter of the base circle of the cam 53 to be not more than, i.e., equal to or less than the thickness of the base plate 10, as shown in fig. 3, the cam 53 does not abut against the platen assembly 30 when the tip of the contour of the cam 53 is traversed, so that the platen assembly 30 can be pressed against the workpiece 90.

Preferably, in the present embodiment, the bottom plate 10 is a rectangular low carbon steel bottom plate 10, and the pressing plate is a low carbon steel pressing plate; processing has mounting groove on the bottom plate 10, and the overall dimension of first backing plate 20 is the same in mounting groove's size, and processing has a plurality of bottom plate 10 screw holes in the mounting groove for fixed dress inlays the first backing plate 20 in mounting groove, as shown in fig. 9, the bilateral symmetry of the bar groove 21 of first backing plate 20 is equipped with the through-hole of taking the counter bore, and the bolt penetrates the through-hole of taking the counter bore on the first backing plate 20 in proper order, bottom plate 10 screw hole, with the cooperation nut, in order to realize being connected of first backing plate 20 and bottom plate 10.

Preferably, in order to achieve reliable clamping and improve data accuracy, the clamping assembly 40 of the present embodiment is implemented by the following implementation modes:

the clamping assembly 40 includes a coupling bolt 41 and a coupling nut 42; two rows of through holes are respectively arranged on two sides of the mounting groove 11 of the bottom plate 10, each row of through holes comprises a plurality of first through holes 12 arranged at intervals along the length direction of the bottom plate 10, second through holes 301 arranged at intervals along the length direction of the pressure plate assembly 30 are respectively arranged on the first pressure plate 31 and the second pressure plate 32, the connecting bolt 41 penetrates through the first through holes 12 and the second through holes 301, and the connecting nut 42 is screwed on the connecting bolt 41 so as to clamp the workpiece to be welded 90 between the pressure plate assembly 30 and the bottom plate 10. Preferably, the first through hole 12 is a through hole with a counterbore, and the diameter of the counterbore is slightly smaller than the diameter of a circumcircle of the head of the hexagon bolt.

In the present embodiment, the movable connection between the first pressing plate 31 and the base plate 10 and between the second pressing plate 32 and the base plate 10 may be achieved by passing the connection bolt 41 through the first through hole 12 and the second through hole 301, so that the pressing plate assembly 30 may move up and down along the bolt to approach or separate from the base plate 10.

Preferably, as shown in fig. 8, each second through hole 301 includes a plurality of connected circular holes, and the diameters of the circular holes are the same as the diameter of the first through hole 12 on the bottom plate 10, and are all 0.5mm larger than the diameter of the bolt.

On the basis of the above structure, in order to realize the movable connection between the pressure plate assembly 30 and the bottom plate 10, so as to realize that the pressure plate assembly 30 can approach or leave the bottom plate 10 along a fixed stroke, the following technical solutions are adopted in the present embodiment:

preferably, in order to ensure that the pressure plate assembly 30 can be lifted smoothly, and the fixture is convenient for an operator to clamp and disassemble the workpiece 90, the number of the lifting assemblies 50 is two, and the two lifting assemblies 50 are respectively installed on the two opposite side end faces of the bottom plate 10; two cams 53 are mounted on the rotating shaft 52 of each lifting assembly 50 at intervals; when the rotating shaft 52 of each lifting assembly 50 rotates, one cam 53 is used for lifting or lowering the first pressure plate 31, and the other cam 53 is used for lifting or lowering the second pressure plate 32; as shown in fig. 4 and 5, an interval between adjacent cams 53 of one of the lifting assemblies 50 is a first interval, an interval between adjacent cams 53 of the other lifting assembly 50 is a second interval, the second interval is greater than the first interval, the second interval is used for clamping and disassembling the workpiece 90, and in fig. 5, an interval between two right cams 53 is the second interval, so that the workpiece 90 can be conveniently inserted and extracted.

Specifically, in the present embodiment, the length of the cam 53 of one of the lifting members 50 is long, and the length of the cam 53 of the other lifting member 50 is short, so that the interval between the adjacent cams 53 is large, and the second interval is larger than the first interval.

Preferably, the lengths of the first and second pressing plates 31 and 32 are longer than the length of the base plate 10, so that both ends of the first and second pressing plates 31 and 32 in the length direction protrude from the base plate 10, and when the cam 53 rotates, the first and second pressing plates 31 and 32 can be abutted to lift the pressing plate assembly 30.

Preferably, as shown in fig. 5, a second backing plate 61, an arc striking plate 62 and an arc extinguishing plate 63 having the same thickness as the workpiece 90 to be welded and clamped between the pressure plate assembly 30 and the base plate 10 are further included.

Preferably, in this embodiment, the lifting assembly 50 is connected to the base plate 10 by:

preferably, the clamp further comprises a lateral connector, in this embodiment the lateral connector is a bolt; lateral threaded holes 13 are respectively formed in the side end surfaces of two sides in the length direction of the base plate 10, a second mounting hole 513 is formed in the mounting surface 511 of the bearing seat 51, and a lateral connecting piece penetrates through the second mounting hole 513 and the lateral threaded holes 13 so as to fix the bearing seat 51 to the base plate 10.

On the basis of the structure, the working principle of the flat plate straight seam welding test fixture of the embodiment is as follows:

placing a flat plate straight seam welding test fixture on a workbench, and selecting a proper copper first base plate 20 to be installed in an installation groove of a bottom plate 10 according to different test piece materials; according to different requirements on the thickness or the clamping distance of the workpiece 90 to be welded, when the first pressing plate 31 is connected with the base plate 10 and the second pressing plate 32 is connected with the base plate 10, a proper round hole in the second through hole 301 is selected to penetrate through the connecting bolt 41, and the connecting nut 42 is screwed to the end part of the bolt; an operator rotates the two handles 54 simultaneously to rotate the cam 53 around the rotating shaft 52, the first pressure plate 31 and the second pressure plate 32 are lifted up by the aid of the profile surface of the cam 53, when the pressure plates are lifted to the highest point, the cam 53 is continuously rotated to enable the tip of the profile surface of the cam 53 to continuously rotate towards the direction close to the side end surface of the bottom plate 10 until the profile surface of the cam 53 is contacted with the side end surface of the bottom plate 10, the handle 54 can be released, the pressure plate assembly 30 can be kept at the current height, and the clamp is kept in a detachable state; inserting the workpiece 90 into the second interval below the pressure plate and centering the workpiece, and then placing two second base plates 61, arc striking plates 62 and arc extinguishing plates 63 which are as thick as the workpiece 90; after loading of the workpiece 90 is completed, the handle 54 is rotated, so that the tip of the profile surface of the cam 53 rotates in the direction away from the bottom plate 10, the pressing plate descends, after the pressing plate is contacted with the workpiece 90, the handle 54 is loosened, the nut is screwed, and reliable clamping of the workpiece 90 to be welded can be completed, and at the moment, the clamp is in a clamping state; after welding is completed, the nuts are unscrewed to the end portions of the bolts, the two handles 54 are rotated to enable the cams 53 to rotate, the pressure plate assembly 30 is lifted by means of the profile surfaces of the cams 53, the cams 53 are continuously rotated after the pressure plate assembly 30 is lifted to the highest point until the profile surfaces of the cams 53 are in contact with the end portions of the bottom plate 10, the handles 54 are loosened, the workpiece 90 is taken out of the fixture, and clamping, welding and dismounting processes of the workpiece 90 are completed.

The flat plate straight seam welding clamp of the embodiment is simple and convenient to operate, can be operated by one person, is reliable in clamping and is beneficial to improving the working efficiency.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims (10)

1. The utility model provides a flat plate straight seam welding test fixture which characterized in that:

the device comprises a bottom plate, a first base plate, a pressure plate assembly, a clamping assembly and a lifting assembly; the pressure plate assembly comprises a first pressure plate and a second pressure plate, and the pressure plate assembly is movably connected with the bottom plate; the first base plate is arranged in the middle of the bottom plate and provided with a strip-shaped groove;

the lifting assembly comprises a bearing seat, a rotating shaft arranged on the bearing seat, a cam sleeved on the rotating shaft and a handle fixedly arranged on the rotating shaft, the mounting surface of the bearing seat is connected with the side end surface of the bottom plate, and the distance between the rotating axis of the rotating shaft and the mounting surface is larger than the base radius of the cam; the diameter of the base circle of the cam is smaller than or equal to the thickness of the base plate;

the clamp has a loading and unloading state and a clamping state; when the clamp is in the assembling and disassembling state, the cam abuts against the pressure plate assembly, so that a space for assembling and disassembling a workpiece to be welded is formed between the pressure plate assembly and the bottom plate, and the cam abuts against the side end face of the bottom plate; when the clamp is in the clamping state, the pressure plate assembly abuts against a workpiece, and the clamping assembly is used for clamping the workpiece between the pressure plate assembly and the bottom plate; the handle is used for driving the cam to rotate around the rotating axis, so that the clamp is switched between the assembling and disassembling state and the clamping state.

2. The flat plate butt welding test jig of claim 1, characterized in that:

the bearing seat is provided with a first mounting hole, the rotating shaft is mounted in the first mounting hole, the central axis of the first mounting hole is the rotating axis of the rotating shaft, and the distance between the central axis and the mounting surface is larger than the base radius of the cam.

3. The flat plate butt welding test jig of claim 2, wherein:

the number of the lifting assemblies is two, and the two lifting assemblies are respectively arranged on the two opposite side end surfaces of the bottom plate; two cams are arranged on the rotating shaft of each lifting assembly at intervals; when the rotating shaft of each lifting assembly rotates, one cam is used for enabling the first pressure plate to be lifted or lowered, and the other cam is used for enabling the second pressure plate to be lifted or lowered;

the interval between the adjacent cams of one lifting assembly is a first interval, the interval between the adjacent cams of the other lifting assembly is a second interval, the second interval is larger than the first interval, and the second interval is used for clamping and disassembling workpieces.

4. The flat plate butt welding test jig of claim 3, characterized in that:

the lengths of the first pressing plate and the second pressing plate are both longer than that of the bottom plate, so that the first pressing plate and the second pressing plate are pushed by the cam to lift the pressing plate assembly.

5. The flat plate butt welding test jig of claim 1, characterized in that:

the bottom plate is provided with a mounting groove, and the first backing plate is embedded in the mounting groove.

6. The flat plate butt welding test jig of claim 5, characterized in that:

the clamping assembly comprises a connecting bolt and a connecting nut;

the two sides of the mounting groove of the base plate are respectively provided with a first through hole, the first pressing plate and the second pressing plate are respectively provided with a second through hole, the connecting bolt penetrates through the first through hole and the second through hole, and the connecting nut is in threaded connection with the connecting bolt so as to clamp a workpiece to be welded between the pressing plate assembly and the base plate.

7. The flat plate butt welding test jig of claim 6, characterized in that:

the first through hole is a through hole with a counter bore.

8. The flat plate butt welding test jig of claim 6, characterized in that:

two rows of through holes are symmetrically arranged on two sides of the mounting groove of the bottom plate, and each row of through holes comprises a plurality of first through holes which are arranged at intervals along the length direction of the bottom plate; the first pressing plate is provided with a plurality of second through holes at intervals along the length direction; a plurality of second through holes are arranged at intervals along the length direction of the second pressing plate;

each second through hole comprises a plurality of communicated round holes.

9. The flat plate butt welding test jig of claim 2, wherein:

the second base plate is as thick as the workpiece to be welded and clamped between the pressure plate assembly and the bottom plate, and the arc striking plate and the arc quenching plate are arranged on the second base plate;

the distance between the central axis and the mounting surface is L, the radius of the cam base circle is R, and the L-R/R is more than or equal to 0.15 and less than or equal to 0.3.

10. The flat plate butt welding test jig of claim 1, characterized in that:

the device also comprises a lateral connecting piece;

lateral threaded holes are respectively formed in the side end faces of the two sides of the bottom plate in the length direction, a second mounting hole is formed in the mounting face of the bearing seat, and the lateral connecting piece penetrates through the second mounting hole and the lateral threaded holes to fix the bearing seat on the bottom plate.

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