A high frequency straight seam welding device for steel pipe production

Abstract

The present invention provides a high-frequency straight seam welding device for steel pipe production, the welding device comprises a welding seat, an extrusion seat, a high-frequency welding seat, a guide seat, a closed cover, a first gas supply pipe and a second gas supply pipe, the welding seat, the extrusion seat, the guide seat, the high-frequency seat, the first gas supply pipe and the second gas supply pipe are located in the closed cover, the steel pipe passes through one side of the closed cover and then passes through the guide seat, the high-frequency welding seat, the extrusion seat and the welding seat in sequence, and then passes through the other side of the closed cover; the first gas supply pipe passes through one side of the closed cover and extends to the side of the extrusion seat away from the high-frequency seat, the second gas supply pipe passes through one side of the closed cover and extends to the side of the extrusion seat close to the high-frequency seat. The layout design of the gas supply pipe ensures that the gas protection is not only before welding, but also protects the upper part of the weld after welding, effectively improving the overall high-frequency welding problem; the closed cover has an overall sealing effect on the welding section, so that argon gas is not easy to dissipate, and the inert gas protection effect of the welding process is ensured under double protection.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe processing, and in particular to a welding device for steel pipe production. Background Art

[0002] When ERW high-frequency pipes are welded, the material is easily oxidized during the melting and solidification process, which reduces the corrosion resistance of the weld. In addition, the weld is combined with impurities and moisture in the air, which easily produces pores and causes weld cracking. Therefore, high-frequency pipes are welded.

[0003] During the melting to solidification process, the weld needs to be protected by pure argon gas to achieve the effect of weld corrosion protection and air isolation.

[0004] Since ERW high-frequency welding must have a protection length of 500~800mm from solidification, most common shielding gases cover a single point and are difficult to be directly applied to high-frequency welded pipes. Therefore, a shielding gas that can cover the pipe during the welding stage of the pipe making process is required.

[0005] The gas supply pipeline before and after welding and the welding device are isolated from the outside world on the periphery to ensure that the weld can be protected and isolated from the outside world in the longer welding section. Summary of the invention

[0006] In view of the above technical problems, the present invention provides a welding device for steel pipe production, which can ensure that the longer welding section can protect the weld and isolate the contact with the outside world, and is easy to disassemble when adjusting the mold.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] A high-frequency straight seam welding device for steel pipe production, the welding device comprises a welding seat, an extrusion seat, a high-frequency seat, a guide seat, a sealing cover, a first air supply pipe and a second air supply pipe, the welding seat, the extrusion seat, the guide seat, the high-frequency seat, the first air supply pipe

[0009] The air pipe and the second air supply pipe are located in the closed cover. The steel pipe passes through one side of the closed cover and then passes through the guide seat, high-frequency seat, extrusion seat and welding seat in sequence, and then passes through the other side of the closed cover; the first air supply pipe passes through one side of the closed cover

[0010] The second air supply pipe passes through a side surface of the closed cover and extends to a side of the extrusion seat close to the high frequency seat.

[0011] Furthermore, the gas outlet end of the first gas supply pipe is provided with a gas supply section parallel to the welded steel pipe, and a plurality of gas outlet holes are provided on the gas supply section.

[0012] Furthermore, the plurality of air outlet holes are evenly distributed on the lower pipe wall of the air supply section along the axial direction of the first air supply pipe, and are located directly above the weld of the steel pipe.

[0013] Furthermore, the end of the air supply section is a closed end.

[0014] Furthermore, the closing cover includes a first column, a second column, a third column, a fourth column and a top cover connected to the top ends of the four columns, a welding seat closing plate is provided between the first column and the second column, an extrusion seat closing plate is provided between the second column and the third column, a guide seat closing plate is provided between the third column and the fourth column, and a high-frequency seat closing plate is provided between the fourth column and the first column.

[0015] Furthermore, the welding seat closing plate is fixed to the first pillar and the second pillar by screws, and the guide seat closing plate is fixed to the third pillar and the fourth pillar by multiple screws.

[0016] Furthermore, the welding seat closing plate and the guide seat closing plate are provided with openings in the middle and lower parts, and the openings are detachably installed with a first closing block and a second closing block for closing, respectively. The first closing block and the second closing block are provided with holes for the steel pipe to pass through, and the first closing block and the second closing block are fixed to the outer surfaces of the welding seat closing plate and the guide seat closing plate respectively by multiple screws.

[0017] Furthermore, the screw is an eye screw.

[0018] Furthermore, the extrusion seat closing plate includes a lower plate, a left upper plate and a right upper plate, and the front end seat and the rear end seat at the bottom of the extrusion seat are located outside the extrusion seat closing plate and the high-frequency seat closing plate.

[0019] Furthermore, the welding seat, extrusion seat, high-frequency seat, guide seat and closing cover are all fixed to the machine base bed by bolts.

[0020] On the one hand, high-frequency weld coverage is different from traditional welding gas supply. Traditional welding gas supply has no distribution problem because of the single point facing the weld. High-frequency welding itself is three-roller mold welding. The weld is separated by the welding roller area. The gas supply must be uniform before and after welding. Therefore, the gas supply distribution is extremely important, otherwise the gas supply will interfere with each other. The welding device for steel pipe production of the present invention is provided with a first gas supply pipe extending to the top of the steel pipe after welding and a second gas supply pipe extending to the beginning of the steel pipe near the welding point before welding, so that gas supply protection is realized before and after welding. The gas supply section of the first gas supply pipe is provided with gas outlets along the axial direction of the pipe, which greatly improves the problem of weld cracking; the end of the first gas supply pipe is set as a closed section, and air is not blown to the welding point from the rear of welding, so that the protective gas flow before and after welding does not affect each other; the gas coverage around the welding point is provided by the second gas supply pipe, and the second gas supply pipe blows air around the welding point from the front of welding.

[0021] On the other hand, the welding device of the present invention is provided with a closed cover, which avoids the four-sided structural arrangement of the welding seat, the extrusion seat, the guide seat, and the high-frequency seat, forming a closed structure in the welding area. The closed cover provides an overall sealing effect for the welding section, making it difficult for argon gas to be emitted, and fully ensuring the inert gas protection effect of the welding process under double protection.

[0022] Third, there must be a large adjustment space when changing the mold in the welding section. The welding seat closing plate and the guide seat closing plate of the closing cover are detachably fixed to the column by screws. At the same time, the first closing block and the second closing block with steel pipe through holes are also detachably fixed by screws. The overall closing cover adopts a quick-disassembly structure design, which solves the problem of long disassembly time before mold adjustment caused by sealing; the screws use lifting eye screws and can be quickly disassembled, providing adjustment personnel with convenient operation and quick reset of production.

[0023] The welding device for steel pipe production disclosed in the present invention is used to protect the area around the weld, remove the adverse effects of impurities and moisture in the air on the welding process, and greatly improve the cracking problem of the weld. Since the gas supply is argon inert gas, the oxidation problem of the weld at high welding temperature is also improved. In addition, through the layout design of the gas supply through the gas supply pipe, the gas protection is evenly distributed above the weld not only before welding, but also after welding, effectively improving the overall high-frequency welding problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structure of the sealing cover of the welding device for steel pipe production according to the present invention is schematically shown. Figure 1 ;

[0025] Figure 2 The structure of the sealing cover of the welding device for steel pipe production according to the present invention is schematically shown. Figure 2 ;

[0026] Figure 3 The structure of the sealing cover of the welding device for steel pipe production according to the present invention is schematically shown. Figure 3 ;

[0027] Figure 4 It is a schematic diagram of the internal structure of the welding device for steel pipe production according to the present invention;

[0028] Figure 5 It is an enlarged schematic diagram of the gas supply end of the first gas supply pipe of the welding device for steel pipe production described in the present invention.

[0029] Among them, 1- welding seat, 2- extrusion seat, 3- high-frequency seat, 4- guide seat, 5- closing cover, 6- first air supply pipe, 7- second air supply pipe, 8- steel pipe, 9- screw, 21- front end seat, 22- rear end seat, 51- first column, 52- second column, 53- third column, 54- fourth column, 55- top cover, 56- welding seat closing plate, 57- extrusion seat closing plate, 58- guide seat closing plate, 59- high-frequency seat closing plate, 561- first closing block, 581- second closing block, 571- lower plate, 572- upper left plate, 573- upper right plate, 61- air supply section, 611- air outlet. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] like Figure 1-Figure 5 A high-frequency straight seam welding device for steel pipe production is shown, and the welding device includes a welding seat 1, an extrusion seat 2, a high-frequency seat 3, a guide seat 4, a closing cover 5, a first air supply pipe 6 and a second air supply pipe 7. The welding seat 1, the extrusion seat 2, the guide seat 4, the high-frequency seat 3, the first air supply pipe 6 and the second air supply pipe 7 are located in the closing cover 5, and the welding seat 1, the extrusion seat 2, the high-frequency seat 3, the guide seat 4 and the closing cover 5 are all fixed to the machine base bed by bolts.

[0032] In some embodiments, the closing cover 5 includes a first column 51, a second column 52, a third column 53, a fourth column 54 and a top cover 55 connected to the top ends of the four columns, a welding seat closing plate 56 is provided between the first column 51 and the second column 52, an extrusion seat closing plate 57 is provided between the second column 52 and the third column 53, a guide seat closing plate 58 is provided between the third column 53 and the fourth column 54, and a high-frequency seat closing plate 59 is provided between the fourth column 54 and the first column 51.

[0033] In some embodiments, the welding seat closing plate 56 is fixed to the first pillar 51 and the second pillar 52 by screws 9 , and the guide seat closing plate 58 is fixed to the third pillar 53 and the fourth pillar 54 by multiple screws 9 .

[0034] In some embodiments, openings are relatively provided in the middle and lower parts of the welding seat closing plate 56 and the guide seat closing plate 58, and the openings are respectively detachably installed with a first closing block 561 and a second closing block 581 for closing, and the first closing block 561 and the second closing block 581 are relatively provided with through holes for the steel pipe to pass through, and the first closing block 561 and the second closing block 581 are respectively fixed to the outer surfaces of the welding seat closing plate 56 and the guide closing plate 58 by multiple screws 9.

[0035] In some embodiments, the screw 9 is a lifting eye screw.

[0036] In some embodiments, the through hole is a circular through hole, and the diameter of the circular through hole is adapted to the diameter of the steel pipe.

[0037] In some embodiments, the extrusion seat closing plate 57 includes a lower plate 571, an upper left plate 572 and an upper right plate 573, and the front end seat 21 and the rear end seat 22 at the bottom of the extrusion seat 2 are located on the outside of the extrusion seat closing plate 57 and the high-frequency seat closing plate 59.

[0038] After the steel pipe 8 passes through the through hole on the guide seat closing plate 58 of the closing cover 5, it passes through the guide seat 4, the high-frequency seat 3, the extrusion seat 2 and the welding seat 1 in sequence, and then passes through the welding seat closing plate 56 of the closing cover 5; after the first air supply pipe 6 passes through the guide seat closing plate 58 of the closing cover 5, it extends to the side of the extrusion seat 2 away from the high-frequency seat 3, and after the second air supply pipe 7 passes through the guide seat closing plate 58 of the closing cover 5, it extends to the side of the extrusion seat 2 close to the high-frequency seat 3.

[0039] In some embodiments, the air outlet end of the first air supply pipe 6 is provided with an air supply section 61 parallel to the steel pipe 5 , and a plurality of air outlet holes 611 are provided on the air supply section 61 .

[0040] In some embodiments, the plurality of air outlet holes 611 are evenly distributed on the lower wall of the air supply section 61 along the axial direction of the first air supply pipe 6 , and are located directly above the weld of the steel pipe 5 .

[0041] In some embodiments, the end of the air supply section 61 is a closed end.

[0042] Those skilled in the art should understand that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-frequency straight seam welding device for steel pipe production, characterized in that: The welding device includes a welding seat, an extrusion seat, a high-frequency seat, a guide seat, a closed cover, a first air supply pipe and a second air supply pipe. The welding seat, extrusion seat, guide seat, high-frequency seat, the first air supply pipe and the second air supply pipe are located in the closed cover. After the steel pipe passes through one side of the closed cover, it passes through the guide seat, high-frequency seat, extrusion seat and welding seat in sequence, and then passes through the other side of the closed cover; the first air supply pipe passes through one side of the closed cover and extends to the side of the extrusion seat away from the high-frequency seat, the second air supply pipe passes through one side of the closed cover and extends to the side of the extrusion seat close to the high-frequency seat, and the second air supply pipe blows air from the front of the welding to the surrounding of the welding point; the air outlet end of the first air supply pipe is provided with an air supply section parallel to the steel pipe after welding, and a plurality of air outlet holes are provided on the air supply section, and the plurality of air outlet holes are evenly distributed on the lower side pipe wall of the air supply section along the axial direction of the first air supply pipe, and are located directly above the weld of the steel pipe, and the end of the air supply section is a closed end.

2. A high-frequency straight seam welding device for steel pipe production according to claim 1, characterized in that: The closing cover includes a first column, a second column, a third column, a fourth column and a top cover connected to the top ends of the four columns, a welding seat closing plate is provided between the first column and the second column, an extrusion seat closing plate is provided between the second column and the third column, a guide seat closing plate is provided between the third column and the fourth column, and a high-frequency seat closing plate is provided between the fourth column and the first column.

3. A high frequency straight seam welding device for steel pipe production according to claim 2, characterized in that: The welding seat closing plate is fixed to the first pillar and the second pillar by screws, and the guide seat closing plate is fixed to the third pillar and the fourth pillar by multiple screws.

4. A high frequency straight seam welding device for steel pipe production according to claim 3, characterized in that: The welding seat closing plate and the guide seat closing plate are provided with openings in the middle and lower parts, and the openings are closed by a removable first closing block and a second closing block respectively. The first closing block and the second closing block are provided with holes for the steel pipe to pass through, and the first closing block and the second closing block are fixed to the outer surfaces of the welding seat closing plate and the guide seat closing plate respectively by multiple screws.

5. A high frequency straight seam welding device for steel pipe production according to claim 3 or 4, characterized in that: The screw is a lifting eye screw.

6. A high frequency straight seam welding device for steel pipe production according to claim 2, characterized in that: The extrusion seat closing plate comprises a lower plate, a left upper plate and a right upper plate. The front end seat and the rear end seat of the bottom of the extrusion seat are located outside the extrusion seat closing plate and the high frequency seat closing plate.

7. A high frequency straight seam welding device for steel pipe production according to claim 1, characterized in that The welding seat, extrusion seat, high-frequency seat, guide seat and closing cover are all fixed to the machine base bed by bolts.

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