Lifting type multifunctional welding test platform

Abstract

The invention provides a lifting type multifunctional welding test platform which comprises a welding platform between two stand columns, a key pressing device is arranged above the welding platform, and a plurality of lifting adjusting mechanisms are installed at the adjacent positions of the welding platform and the two stand columns. The distance between the welding platform and the key pressing device is changed by adjusting the lifting adjusting mechanism so that welding of test plates with unconventional wall thicknesses smaller than 3 mm and larger than 40 mm can be achieved. The lifting type multifunctional welding test platform further provides a gas dragging cover and a back gas cooling protection structure, the gas dragging cover is installed on the welding gun structure, shielding gas of the gas dragging cover can carry out post-welding gas protection and cooling on a welding seam area of an easy-to-oxidize material, and welding of an easy-to-oxidize alloy material with poor heat conductivity is met; the back gas cooling protection structure can provide shielding gas and cooling water for the test piece, prevents back oxidation of welding seams of non-ferrous metals such as stainless steel on one hand, cools the test piece on the other hand, takes away heat generated in the welding process, and prevents high-temperature deformation of metal materials with poor thermal conductivity.

Description

Technical Field

[0001] The present invention belongs to the field of welding equipment, and particularly relates to a lifting multi-functional welding test platform. Background Art

[0002] With the implementation of China's oil and gas strategy and the development of high-performance new products, thick-walled oil and gas transmission pipes, high-alloy composite pipes, bimetallic composite pipes and new materials have become the key points and difficulties in the development of oil pipes. Welding of large-wall-thickness plates, composite plates and new material plates has become a trend.

[0003] At present, most conventional flat welding experimental devices can only meet the welding of plates with conventional wall thicknesses (5 - 20 mm). There is no effective welding test device for test plates with small wall thicknesses (below 3 mm) and large wall thicknesses (40 mm). For new materials such as stainless steel, titanium alloy plates, and composite plates, due to the lack of corresponding gas protection devices and cooling devices, and the single welding method, it is impossible to conduct in-depth research on gas shielded welding processes, welding methods and welding quality control. Summary of the Invention

[0004] The purpose of the present invention is to provide a lifting multi-functional welding test platform to overcome the above technical defects.

[0005] To solve the above technical problems, the present invention provides a lifting multi-functional welding test platform, which includes two columns. A welding platform is installed between the two columns. Above the welding platform, there is a piano key pressing device installed on the two columns. At the adjacent parts of the welding platform and the two columns, a plurality of lifting adjustment mechanisms are evenly distributed. By adjusting the lifting adjustment mechanisms, the distance between the welding platform and the piano key pressing device is changed to realize the welding of test plates with unconventional wall thicknesses below 3 mm and above 40 mm.

[0006] The lifting adjustment mechanism includes a support block installed on the column and a connection block installed on the welding platform. The connection block is directly above the support block; the connection block and the support block are locked by a bolt and nut assembly.

[0007] The connection block at least includes an L-shaped structure formed by two rectangular plates. One of the rectangular plates of the L-shaped structure is detachably fixed to the welding platform. A long circular hole is opened on the other rectangular plate of the L-shaped structure, and a positioning bolt screwed on the column is inserted into the long circular hole;

[0008] Angle plates are respectively covered at the right-angle edges at both ends of the L-shaped structure. Threaded holes are opened on both angle plates. A rotating bolt is inserted into the threaded hole of the angle plate close to the support block, and the rotating bolt penetrates through the support block;

[0009] Four nuts are sleeved on the rotating bolt.

[0010] The welding platform and the column are provided with a sliding structure to change the distance between the welding platform and the key pressing device.

[0011] The sliding mechanism includes a T-shaped keyway opened on the side of the column and a T-shaped key bar fixed on the side of the welding platform. The T-shaped key bar can slide along the T-shaped keyway.

[0012] The key pressing device at least includes a pressing frame and keys installed in the pressing frame. An inflatable airbag is arranged above the keys. The inflatable airbag is wrapped in the pressing frame and contacts the keys.

[0013] A girder is arranged on the welding platform, and a welding torch is installed on the girder. A drag gas shield is connected to the welding torch, and a shielding gas is introduced into the drag gas shield.

[0014] A back gas cooling and protection structure is installed at the weld formation position of the welding platform. The back gas cooling and protection structure includes a copper plate laid on the welding platform.

[0015] Three channels are opened in the plate body of the copper plate, namely a cooling water injection hole, a first shielding gas injection hole, and a cooling water outlet hole. The first shielding gas injection hole is located directly below the weld to uniformly spray shielding gas onto the weld, and the other two cooling water channels are interconnected.

[0016] The beneficial effects of the present invention are as follows:

[0017] The lifting type multi-functional welding test platform is designed with a lifting adjustment mechanism. By adjusting the lifting adjustment mechanism, the distance between the welding platform and the key pressing device is changed to realize the welding of test plates with unconventional wall thicknesses below 3 mm and above 40 mm. Moreover, welding methods such as TIG, MIG, and MAG are integrated, and it is applicable to the gas shielded welding processes of low alloy steel, stainless steel, titanium alloy, and new composite plates.

[0018] The lifting type multi-functional welding test platform also provides a drag gas shield and a back gas cooling and protection structure. The drag gas shield is installed on the welding torch structure. The shielding gas of the drag gas shield can provide post-weld gas protection and cooling for the weld area of easily oxidized materials, meeting the welding requirements of easily oxidized and poor heat-conducting alloy materials. The back gas cooling and protection structure is located between the key pressing device and the test plate to be welded. The back gas cooling and protection structure can provide shielding gas and cooling water for the test piece. On the one hand, it prevents the back surface oxidation of welds of non-ferrous metals such as stainless steel, and on the other hand, it cools the test piece and takes away the heat generated during the welding process to prevent the high-temperature deformation of poor heat-conducting metal materials.

[0019] To make the above content of the present invention more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. Description of the Drawings

[0020] Figure 1It is a schematic structural diagram of a lifting multi-functional welding test platform.

[0021] Figure 2 It is a top view of a lifting multi-functional welding test platform.

[0022] Figure 3 It is a schematic structural diagram of a welding platform (the connecting block 21 is not shown).

[0023] Figure 4 It is a schematic structural diagram of a column.

[0024] Figure 5 It is an exploded view of a lifting adjustment mechanism (the bolts are not shown).

[0025] Figure 6 It is a front view of a lifting adjustment mechanism.

[0026] Figure 7 It is a cross-sectional view of a key pressing device.

[0027] Figure 8 It is a schematic structural diagram of a drag gas hood.

[0028] Figure 9 It is a cross-sectional view of a drag gas hood.

[0029] Explanation of reference numerals:

[0030] 10. Column; 11. Support block; 12. T-shaped keyway;

[0031] 20. Welding platform; 21. Connecting block; 22. Positioning bolt; 23. Rotating bolt; 231. First nut; 232. Second nut; 233. Third nut; 234. Fourth nut; 24. T-shaped key bar; 25. Support box; 251. T-shaped groove plate; 252. Pressing plate;

[0032] 30. Key pressing device; 31. Key; 32. Inflatable airbag;

[0033] 40. Drag gas hood; 41. Second protective gas injection hole; 42. Cavity; 43. Copper mesh;

[0034] 50. Back gas cooling protection structure; 51. Copper plate; 511. Cooling water injection hole; 512. First protective gas injection hole; 513. Cooling water outlet hole. Detailed implementation manners

[0035] The following specific embodiments illustrate the implementation manners of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0036] It should be noted that in the present invention, the up, down, left, and right in the figures are regarded as the up, down, left, and right of the liftable multi-functional welding test platform described in this specification.

[0037] Now, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely, and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the drawings are not limitations on the present invention. In the drawings, the same units / components are denoted by the same reference numerals.

[0038] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the ordinary meaning understood by those skilled in the art. Additionally, it can be understood that terms defined in commonly used dictionaries should be construed as having a meaning consistent with the context of their relevant fields, and should not be construed as having an idealized or overly formal meaning.

[0039] This embodiment relates to a liftable multi-functional welding test platform. Please refer to Figure 1 , which includes two columns 10. A welding platform 20 is installed between the two columns 10. Above the welding platform 20, a key pressing device 30 installed on the two columns 10 is provided. A plurality of lifting adjustment mechanisms are evenly distributed at the adjacent parts of the welding platform 20 and the two columns 10. By adjusting the lifting adjustment mechanisms, the distance between the welding platform 20 and the key pressing device 30 is changed to achieve welding of test plates with unconventional wall thicknesses below 3 mm and above 40 mm.

[0040] The two columns 10 and the key pressing device 30 can be considered as being fixedly integrated. Therefore, when the welding platform 20 is driven to slide up and down along the two columns 10 by the lifting adjustment mechanisms, the gap between the welding platform 20 and the key pressing device 30 will gradually increase or decrease, so as to meet the welding of test plates with small wall thicknesses (wall thickness below 3 mm) and test plates with large wall thicknesses (wall thickness above 40 mm).

[0041] Test plates, test pieces, and workpieces all refer to the plates to be welded.

[0042] Specifically, the structure of the lifting adjustment mechanism is as follows:

[0043] Please refer to Figure 1 and Figure 4 , the lifting adjustment mechanism includes a support block 11 installed on the column 10 and a connection block 21 installed on the welding platform 20. As Figure 5 shown, the connection block 21 is directly above the support block 11, and the connection block 21 and the support block 11 are locked by a bolt and nut assembly.

[0044] The installation position of the lifting adjustment mechanism can be referred to Figure 1 , in this embodiment, a lifting adjustment mechanism is respectively arranged at the four corners of the welding platform 20. The four lifting adjustment mechanisms are symmetrically distributed at the four corners of the welding platform 20. If the gap between the welding platform 20 and the key pressing device 30 needs to be adjusted, the lifting adjustment mechanism needs to be adjusted synchronously to ensure the smooth up and down sliding of the welding platform 20.

[0045] Refer to Figure 5 and Figure 6 , the connecting block 21 at least includes an L-shaped structure formed by splicing two rectangular plates. One of the rectangular plates of the L-shaped structure is detachably fixed to the welding platform 20, and a long circular hole is opened on the other rectangular plate of the L-shaped structure. A positioning bolt 22 screwed on the column 10 is inserted in the long circular hole. When the welding platform 20 needs to be moved up or down, the welding platform 20 slides along the long circular hole along with the connecting block 21. Here, the long circular hole and the positioning bolt 22 play a role of positioning and guiding.

[0046] Angle plates are respectively covered on the right-angle edges at both ends of the L-shaped structure. Threaded holes are opened on both angle plates. A rotating bolt 23 is inserted in the threaded hole of the angle plate close to the support block 11. The rotating bolt 23 penetrates through the support block 11. As Figure 6 shown, four nuts are sleeved on the rotating bolt 23. The four nuts are the first nut 231, the second nut 232, the third nut 233, and the fourth nut 234 from top to bottom respectively.

[0047] The support block 11 is composed of two square plates, and one of the square plates is perpendicular to the center of the other square plate. Specifically, it can be referred to Figure 5 .

[0048] The welding platform 20 is connected to the left and right columns 10 by means of a key bar and screws. The specific structure is as follows:

[0049] The distance between the welding platform 20 and the key pressing device 30 is changed by the welding platform 20 and the column 10 through a sliding structure. The sliding mechanism includes a T-shaped key groove 12 opened on the side of the column 10 (see Figure 4 ) and a T-shaped key bar 24 fixed on the side of the welding platform 20 (see Figure 3 ). The T-shaped key bar 24 can slide along the T-shaped key groove 12.

[0050] The cooperation between the T-shaped key bar 24 and the T-shaped key groove 12 realizes the up and down sliding of the welding platform 20.

[0051] It should be particularly noted here that when installing the equipment, the welding platform 20 has been connected to the left and right columns 10 by using the lifting adjustment mechanism and locked and fixed. Therefore, every time the height of the welding platform 20 is adjusted, only need to adjust Figure 6The lifting and adjusting mechanism can be used.

[0052] The key pressing device 30 at least includes a pressing frame and a key 31 installed in the pressing frame. Figure 2 and Figure 7 An inflatable airbag 32 is provided above the key 31 , and the inflatable airbag 32 is wrapped in the compression frame and contacts the key 31 .

[0053] The key 31 and the test plate need to be in uniform and close contact to ensure that the workpiece is evenly pressed, and need to have a good heat dissipation effect to improve the welding quality. Therefore, an inflatable airbag 32 is provided in this embodiment. When the inflatable airbag 32 is filled with gas, the key 31 can be pressed down, and the key 31 presses the workpiece to achieve uniform force on the workpiece.

[0054] A beam is provided on the welding platform 20, and a welding gun is installed on the beam. Figure 1 As shown, a gas hood 40 is connected to the welding gun, and a protective gas is passed through the gas hood 40. The structure of the gas hood 40 can be referred to in Figure 8 , which is a hood-like structure having a cavity 42, in which a protective gas is filled. Figure 8 The second shielding gas injection hole 41 is used to inject shielding gas, which is an inert gas, such as argon. The shielding gas can extend the gas protection and cooling time of the weld area, avoid oxidation and cracking of the weld after welding of special materials, and can meet the welding of alloy materials that are easily oxidized and have poor thermal conductivity.

[0055] See also Figure 9 A copper mesh 43 is also installed in the drag gas hood 40. The copper mesh 43 can ensure that the protective gas injected into the drag gas hood 40 through the air pipe can be dispersed to every place in the drag gas hood 40 to protect the weld in all directions. Specifically, the drag gas hood 40 is equipped with a copper mesh 43 in the width direction of the drag gas hood. The copper mesh 43 is stuck in the drag gas hood 40. For example, the width of the drag gas hood 40 and the copper mesh 43 is about 40 mm, and the width of the weld is 20 mm. The protective gas in the drag gas hood 40 is blown uniformly and stably through the copper mesh 43 to protect the weld and the heat-affected zone; at the same time, air flow turbulence is prevented to form a stable protective gas atmosphere.

[0056] like Figure 2 As shown, a back gas cooling protection structure 50 is installed at the weld formation position of the welding platform 20. The back gas cooling protection structure 50 includes a copper plate 51 laid on the welding platform 20. Figure 7 The copper plate 51 is provided with three holes, namely a cooling water injection hole 511, a first shielding gas injection hole 512 and a cooling water outlet hole 513. The first shielding gas injection hole 512 is located directly below the weld so that the first shielding gas injection hole 512 can evenly spray shielding gas toward the weld. The other two cooling water holes are interconnected.

[0057] That is to say, the back gas cooling protection structure 50 can provide protective gas and cooling water for the test piece. On the one hand, it can prevent the back of the weld of non-ferrous metals such as stainless steel from oxidation. On the other hand, it can cool the test piece, take away the heat generated during the welding process, and prevent the high-temperature deformation of metal materials with poor thermal conductivity.

[0058] The application process of the lifting multi-functional welding test platform will be illustrated by examples below.

[0059] It should be noted that Figure 6 The positions of the four nuts shown are only for illustration, and the four nuts do not always remain in the Figure 6 position, but the positions of the four nuts are adjusted according to the height requirements during the adjustment process.

[0060] Welding of small wall thickness test plates (wall thickness below 3mm):

[0061] When welding a welding test plate with dimensions of X80500 (length) × 150 (width) × 3 (thickness) mm, after the test plate enters the welding area and is centered, the key pressing device 30 is started. At this time, the inflation airbag 32 has been inflated, but the key 31 of the key pressing device 30 cannot press the welding test plate, and the welding experiment cannot be carried out. At this time, it is necessary to adjust the height of the welding platform 20 to reduce the gap between the key pressing device 30 and the welding platform 20, so that after the inflation airbag 32 is inflated, the key 31 of the key pressing device 30 can press the welding test plate. The process of adjusting the welding platform 20 is as follows:

[0062] First, loosen the positioning bolt 22 in the lifting adjustment mechanism, loosen the first nut 231 and the third nut 233, then tighten the second nut 232 and the fourth nut 234 in turn. Manually or mechanically drive the side T-shaped key bar 24 of the welding platform 20 to rise along the side T-shaped key groove 12 of the column 10. Stop when reaching the specified height, tighten the first nut 231 and the third nut 233, and finally tighten the positioning bolt 22. That is, there are four symmetrically distributed welding platform lifting adjustment mechanisms at the four corners of the welding platform 20. After the action starts, the four lifting adjustment mechanisms are adjusted evenly and synchronously. Finally, start the key pressing device 30. After the inflation airbag 32 is inflated, the key pressing device 30 presses the welding test plate, and welding starts.

[0063] Welding of large wall thickness test plates (wall thickness above 40mm):

[0064] When using a welding test plate with dimensions of X80500 (length) × 150 (width) × 40 (thickness) mm, since the thickness of the welding test plate is greater than the gap between the key pressing device 30 and the welding platform 20, the test plate cannot enter the welding area. It is necessary to increase the gap between the key pressing device 30 and the welding platform 20 so that the test plate can enter the welding platform. The process of adjusting the welding platform 20 is as follows:

[0065] First, loosen the positioning bolt 22 inside the lifting adjustment mechanism, loosen the second nut 232, and loosen the fourth nut 234. Then, loosen the first nut 231 and the third nut 233 in sequence. Manually or mechanically drive the side T-shaped key bar 24 of the welding platform 20 to start descending along the side T-shaped key groove 12 of the column 10. Stop when it reaches the specified height. Tighten the second nut 232 and the fourth nut 234, tighten the first nut 231 and the third nut 233, and finally tighten the positioning bolt 22. That is, there are four symmetrically distributed welding platform lifting adjustment mechanisms at the four corners of the welding platform 20. After the action starts, the four lifting adjustment mechanisms are adjusted evenly and synchronously. Finally, start the key pressing device 30. After the inflatable airbag 32 is inflated, the key pressing device 30 presses onto the welding test plate, and welding begins.

[0066] Or remove the positioning block bolts at the four corners of the key 31, move the key 31 away, place the 40-mm thick test plate on both sides of the center line of the T-shaped groove plate 251 on the upper surface of the support box 25, align the welding bevel, and use bolts and the 35-mm thick pressing plate 252 through the 4 positioning blocks on the center seat and the T-shaped groove of the center platform for mechanical pressing and fixing, and conduct a welding test.

[0067] Welding of small-wall-thickness materials that are prone to oxidation and have poor thermal conductivity:

[0068] When using a titanium alloy welding test plate of 500 (length) × 150 (width) × 3 (thickness) mm, when the test plate enters the welding area and is centered, after the inflatable airbag 32 is inflated, the key pressing device 30 presses onto the welding test plate. At the same time, argon is passed through the back gas cooling protection structure 50, cooling water is injected into the cooling water injection hole 511, and the protective gas argon is passed through the trailing gas hood 40. After the preparatory work is ready, start welding. 10 - 20 seconds after welding is completed, turn off the argon gas inside the copper plate 51, the cooling water, and the argon gas inside the trailing gas hood 40 in sequence.

[0069] Welding of 2205 duplex stainless steel (inner layer) + X65 pipeline steel (outer layer) composite plates:

[0070] When using a 2205 + X65 composite plate of 500 (L) × 150 (W) × 8 (3 + 5) (t) mm for welding the test plate, it is welded in two steps:

[0071] First step, weld the 2205 duplex stainless steel layer. The test plate enters the welding area. After the test plate is centered, after the inflatable airbag 32 is inflated, the key pressing device 30 presses onto the welding test plate. At the same time, argon gas is passed through the copper plate 51 of the back gas cooling protection structure 50, cooling water is injected into the cooling water injection hole 511, and protective gas argon is passed through the trailing gas shield 40. After the preparatory work is ready, welding is carried out using the gas tungsten arc welding (TIG) method. 10 - 20 seconds after welding is completed, the argon gas in the copper plate 51, the cooling water, and the argon gas in the trailing gas shield 40 are turned off in sequence.

[0072] Second step, weld the X65 layer. The test plate enters the welding area. After the test plate is centered, after the inflatable airbag 32 is inflated, the key pressing device 30 presses onto the welding test plate. At the same time, argon gas is passed through the copper plate 51 of the back gas cooling protection structure 50, and cooling water is injected into the cooling water injection hole 511. After the preparatory work is ready, welding is carried out using the metal inert gas welding (MIG) method. 10 - 20 seconds after welding is completed, the argon gas in the copper plate 51 and the cooling water are turned off in sequence.

[0073] The lifting multi-functional welding test platform provided by this embodiment is applicable to methods such as TIG, MIG, MAG, etc. and combined welding, and meets the requirements of the flat gas shielded welding process and the weldability research of materials for low alloy steel, stainless steel, titanium alloy, composite plates and other materials. By adjusting the gap between the key pressing device and the welding platform, welding of test plates with different thicknesses can be satisfied. The key pressing fingers are in uniform and close contact with the test plate, which can ensure uniform pressure on the workpiece and has a good heat dissipation effect, and can improve the welding quality. Protective gas and water are passed through the copper plate. During the welding test, protective gas and cooling water are provided for the test piece. On the one hand, it prevents oxidation of the back of the welds of non-ferrous metals such as stainless steel, and on the other hand, it cools the test piece and takes away the heat generated during the welding process to prevent high-temperature deformation of metal materials with poor thermal conductivity. Protective gas is passed through the trailing gas shield, which can extend the gas protection and cooling time in the weld area, avoid oxidation and cracking of the welds after welding of special materials, and can meet the welding of alloy materials that are easy to oxidize and have poor thermal conductivity.

[0074] Those of ordinary skill in the art can understand that the above embodiments are specific examples for implementing the present invention, and in practical applications, various changes can be made in form and details without departing from the spirit and scope of the present invention.

Claims

1. Lifting multi-functional welding test platform, comprising two columns (10), a welding platform (20) is installed between the two columns (10), and a piano key pressing device (30) installed on the two columns (10) is provided above the welding platform (20). It is characterized in that: A plurality of lifting adjustment mechanisms are evenly distributed at the adjacent parts of the welding platform (20) and the two columns (10). By adjusting the lifting adjustment mechanisms, the distance between the welding platform (20) and the piano key pressing device (30) is changed to realize the welding of test plates with unconventional wall thicknesses below 3 mm and above 40 mm.

2. The lifting multi-functional welding test platform according to claim 1, It is characterized in that: The lifting adjustment mechanism includes a support block (11) installed on the column (10) and a connection block (21) installed on the welding platform (20), and the connection block (21) is directly above the support block (11); The connection block (21) and the support block (11) are locked by a bolt-nut assembly.

3. The lifting multi-functional welding test platform according to claim 2, It is characterized in that: The connection block (21) at least includes an L-shaped structure formed by splicing two rectangular plates. One of the rectangular plates of the L-shaped structure is detachably fixed to the welding platform (20), and a long circular hole is opened on the other rectangular plate of the L-shaped structure. A positioning bolt (22) screwed on the column (10) is inserted in the long circular hole; Angle plates are respectively covered on the right-angle edges at both ends of the L-shaped structure. Threaded holes are opened on both of the angle plates. A rotating bolt (23) is inserted into the threaded hole of the angle plate close to the support block (11), and the rotating bolt (23) penetrates through the support block (11); Four nuts are sleeved on the rotating bolt (23).

4. The lifting multi-functional welding test platform according to claim 1 or 2 or 3, It is characterized in that: The distance between the welding platform (20) and the piano key pressing device (30) is changed by a sliding structure between the welding platform (20) and the column (10); The sliding mechanism includes a T-shaped key groove (12) opened on the side of the column (10) and a T-shaped key bar (24) fixed on the side of the welding platform (20), and the T-shaped key bar (24) can slide along the T-shaped key groove (12).

5. The lifting multi-functional welding test platform according to claim 1, It is characterized in that: The piano key pressing device (30) at least includes a pressing frame and piano keys (31) installed in the pressing frame. An inflatable airbag (32) is provided above the piano keys (31), and the inflatable airbag (32) is wrapped in the pressing frame and contacts the piano keys (31).

6. The lifting multi-functional welding test platform according to claim 1, It is characterized in that: A girder is provided on the welding platform (20), a welding torch is installed on the girder, a drag gas hood (40) is connected to the welding torch, and a shielding gas is passed through the drag gas hood (40).

7. The lifting multi-functional welding test platform according to claim 1 or 6, characterized in that: a back gas cooling and protection structure (50) is installed at the weld formation position of the welding platform (20), and the back gas cooling and protection structure (50) includes a copper plate (51) laid on the welding platform (20); three channels are formed in the plate body of the copper plate (51), namely a cooling water injection hole (511), a first protective gas injection hole (512) and a cooling water outlet hole (513) in sequence, wherein the first protective gas injection hole (512) is located directly below the weld so that the first protective gas injection hole (512) uniformly sprays protective gas to the weld, and the other two cooling water channels are communicated with each other.

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