WO2022016799A1

WO2022016799A1 - Welding apparatus for use in steel pipe production

Info

Publication number: WO2022016799A1
Application number: PCT/CN2020/138190
Authority: WO
Inventors: 林建维
Original assignee: 璋全五金制品(昆山)有限公司
Priority date: 2020-07-22
Filing date: 2020-12-22
Publication date: 2022-01-27
Also published as: CN111774711A

Abstract

A high-frequency longitudinal welding apparatus for use in steel pipe production. The welding apparatus comprises a welding base (1), a pressing base (2), a high-frequency base (3), a guiding base (4), a sealing cover (5), a first gas supply pipe (6), and a second gas supply pipe (7). The welding base (1), the pressing base (2), the guiding base (4), the high-frequency base (3), the first gas supply pipe (6), and the second gas supply pipe (7) are located in the sealing cover (5). A steel pipe (8) passes through a through hole on a guiding base sealing board (58) of the sealing cover (5), then passes in succession through the guiding base (4), the high-frequency base (3), the pressing base (2), and the welding base (1), and passes through a welding base sealing board (56) of the sealing cover (5). The first gas supply pipe (6) passes through the guiding base sealing board (58) of the sealing cover (5), then extends to the side of the pressing base (2) away from the high-frequency base (3). The second gas supply pipe (7) passes through the guiding base sealing board (58) of the sealing cover (5), then extends to the side of the pressing base (2) near to the high-frequency base (3). In the layout design of gas supply pipes, gas protects the area above the weld seam not only before the welding but also after the welding, effectively solving the problem of integrated high-frequency welding. The overall sealing effect of the sealing cover (5) on welded segments causes argon not to be easily emitted, with inert gas protection during the welding process ensured under dual protection.

Description

A welding device for steel pipe production

technical field

The invention relates to the technical field of steel pipe processing, in particular to a welding device for steel pipe production.

Background technique

When the ERW high-frequency pipe is welded, the material is easily oxidized during the melting and solidification process, which reduces the corrosion resistance of the weld, and the weld is combined with impurities and moisture in the air, which is easy to generate pores and cause weld cracking. The tube is melted to solidification during welding, and the weld needs pure argon protection to achieve the effect of anti-corrosion and air isolation of the weld.

Since ERW high-frequency welding must have a protective length of 500-800mm until it is cured, however, most common protective gases cover a single point, which is difficult to directly apply to high-frequency welded pipes. The gas supply pipeline, and the peripheral welding device is isolated from the outside world to ensure that the long welding section can protect the welding seam and isolate the contact with the outside world.

SUMMARY OF THE INVENTION

In view of the above technical problems, the present invention provides a welding device for steel pipe production, which can ensure that the long welding section can protect the welding seam, isolate the contact with the outside world, and at the same time, it is easy to disassemble when adjusting the mold.

For achieving the above object, the present invention adopts the following technical scheme:

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 closing 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 air supply pipe and the second air supply pipe are located in the closed cover. , and then pass 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, and the second air supply pipe passes through one side of the closed cover, and Extend to the side of the squeeze seat close to the high frequency seat.

Further, the air outlet end of the first air supply pipe is provided with an air supply section parallel to the welded steel pipe, and a plurality of air outlet holes are arranged on the air supply section.

Further, a plurality of the air outlet holes are evenly distributed on the pipe wall on the lower side of the air supply section along the axial direction of the first air supply pipe, and are located directly above the welding seam of the steel pipe.

Further, the end of the gas supply section is a closed end.

Further, the sealing cover includes a first column, a second column, a third column, a fourth column, and a top cover connected with the top ends of the four columns, and a welding seat is provided between the first column and the second column to seal. Plate, between the second column and the third column is provided with an extrusion seat closing plate, between the third column and the fourth column is provided with a guide seat closing plate, between the fourth column and the first column is provided with a high Frequency seat closing plate.

Further, the welding seat closing plate is fixed on the first pillar and the second pillar through screws, and the guide seat closing plate is fixed on the third pillar and the fourth pillar through a plurality of screws.

Further, the middle and lower parts of the sealing plate of the welding seat and the sealing plate of the guide seat are oppositely provided with openings. The closing block is oppositely provided with a hole for the steel pipe to pass through, and the first closing block and the second closing block are respectively fixed on the outer side of the welding seat closing plate oriented as the closing plate through a plurality of screws.

Further, the screw is an eyebolt screw.

Further, the squeeze seat closing plate includes a lower plate, an upper left plate and an upper right plate, and the front end seat and the rear end seat of the bottom of the squeeze seat are located outside the squeeze seat closing plate and the high frequency seat closing plate.

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

On the one hand, the coverage of high-frequency welding seam is different from the traditional welding gas supply. The traditional welding gas supply has no distribution problem because the single point faces the welding seam. The high-frequency welding itself is a three-roll mold welding, and the welding seam is divided by the welding roller. , the gas supply must be uniform before welding and after welding, so the distribution of gas supply is extremely important, otherwise the gas supply will interfere with each other. The second gas supply pipe at the beginning of the steel pipe near the welding point before welding realizes gas supply protection before and after welding. The gas supply section of the first gas supply pipe is distributed with air outlet holes along the pipe axis, which greatly improves the welding seam. The problem of cracking; the end of the first gas supply pipe is set as a closed section, and the air is not blown to the welding point after welding, so that the shielding air flow before and after welding can not affect each other; the gas around the welding point is covered by the second gas supply pipe to provide, the second The air supply pipe blows air around the welding point from the front of the welding.

On the other hand, the welding device of the present invention is provided with a closed cover, and the closed cover avoids the four-sided structure of the welding seat, the extrusion seat, the guide seat, and the high-frequency seat, and forms a closed structure in the welding area, so that the closed cover provides the welding section. The overall sealing effect makes it difficult for the argon gas to be emitted, and the inert gas protection effect of the welding process is fully guaranteed under the double protection.

Third, there must be a large adjustment space when changing the mold in the welding section. The closing plate of the welding seat and the closing plate of the guide seat of the closing cover are detachably fixed on the column by screws. At the same time, there is a first closing block with a steel pipe through hole. And the second closing block is also detachably fixed by screws. The overall closing cover is designed with a quick-release structure, which solves the problem that the disassembly time before the mold adjustment is too long after closing. It is convenient for personnel to work and quickly reset production.

The welding device for steel pipe production disclosed by the invention protects the surrounding of the welding bead, removes the adverse effects of impurities and moisture in the air on the welding process, and greatly improves the cracking problem of the welding bead. The oxidation problem of the weld bead at high welding temperature is improved, and through the design of the gas supply pipe, the gas shield is evenly distributed over the weld seam not only before welding, but also after welding, effectively improving the overall high-frequency welding problem.

Description of drawings

Fig. 1 is the structural schematic diagram 1 of the welding device closure cover for steel pipe production according to the present invention;

Fig. 2 is the structural representation 2 of the sealing cover of the welding device for steel pipe production according to the present invention;

Fig. 3 is the structural schematic diagram 3 of the sealing cover of the welding device for steel pipe production according to the present invention;

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

5 is an enlarged schematic view of the gas supply end of the first gas supply pipe of the welding device for steel pipe production according to the present invention.

Among them, 1-welding seat, 2-extrusion seat, 3-high frequency seat, 4-guide seat, 5-enclosed cover, 6-first gas supply pipe, 7-second gas supply pipe, 8-steel pipe, 9-screw , 21- front seat, 22- rear 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-left upper plate, 573-right upper plate, 61-air supply section, 611-air outlet.

detailed description

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1-5, a high-frequency straight seam welding device for steel pipe production, the welding device includes a welding seat 1, an extrusion seat 2, a high-frequency seat 3, a guide seat 4, a closed cover 5, a first The air supply pipe 6 and the second air supply pipe 7, the welding seat 1, the extrusion seat 2, the guide seat 3, the high frequency seat 4, the first air supply pipe 6 and the second air supply pipe 7 are located in the closed cover 5, and the welding The seat, the extrusion seat, the high frequency seat, the guide seat and the closing cover are all fixed on the machine base bed by bolts.

In some embodiments, the sealing 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 with the top ends of the four columns. A welding seat closing plate 56 is arranged between the second uprights 52 , a pressing seat closing plate 57 is arranged between the second upright column 52 and the third upright column 53 , and a guide is arranged between the third upright column 53 and the fourth upright column 54 The seat closing plate 58 is provided with a high frequency seat closing plate 59 between the fourth column 54 and the first column 51 .

In some embodiments, the welding seat closing plate 56 is fixed to the first pillar 51 and the second pillar 52 through screws 9 , and the guide seat closing plate 58 is fixed to the third pillar 53 and the fourth pillar 52 through a plurality of screws 9 . on the strut 54.

In some embodiments, the middle and lower parts of the welding seat closing plate 56 and the guide seat closing plate 58 are oppositely provided with openings, and the openings are respectively detachably installed with a first closing block 561 and a second closing block 581 to close the openings. The first closing block 561 and the second closing block 581 are oppositely 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 welding seat closing plate 56 and Guide the outer side of the closing plate 58 .

In some embodiments, the above-mentioned screws 9 are eye screws.

In some embodiments, the above-mentioned through holes are circular through holes, and the diameter of the circular through holes is adapted to the diameter of the steel pipe.

In some embodiments, the squeeze seat closing plate 57 includes a lower plate 571 , a left upper plate 572 and a right upper plate 573 , and the front end seat 21 and the rear end seat 22 of the bottom of the squeeze seat 2 are located on the squeeze seat closing plate 57 and the outer side of the high frequency seat closing plate 59.

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 of the closing cover 5. 56; after the first air supply pipe 6 is passed through the guide seat closing plate 58 of the closed cover 5, it extends to the side of the extrusion seat 2 away from the high frequency seat 3, and the second air supply pipe 7 is passed through the guide seat of the closed cover 5 to seal After the plate 58, it extends to the side of the squeeze seat 2 close to the high frequency seat 3.

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 the air supply section 61 is provided with a plurality of air outlet holes 611 .

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

In some embodiments, the end of the gas supply section 61 is a closed end.

It should be understood by those of ordinary skill in the art: the above are only specific embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement made within the spirit and principle of the present invention etc., should be included within the protection scope of the present invention.

Claims

A high-frequency straight seam welding device for steel pipe production, characterized in that the welding device comprises 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, and the The welding seat, the extrusion seat, the guide seat, the high frequency seat, the first air supply pipe and the second air supply pipe are located in the closed cover. and welding seat, and then pass through the other side of the closed cover; the first air supply pipe is passed through one side of the closed cover and extends to the side of the extrusion seat away from the high-frequency seat, and the second air supply pipe is passed through a side of the closed cover. side, and extend to the side of the squeeze seat close to the high frequency seat.
The high-frequency straight seam welding device for steel pipe production according to claim 1, wherein the gas outlet end of the first gas supply pipe is provided with a gas supply section parallel to the welded steel pipe, and the gas supply section is provided on the gas supply section. There are several vent holes.
The high-frequency straight seam welding device for steel pipe production according to claim 2, wherein a plurality of the air outlet holes are evenly distributed on the lower pipe wall of the gas supply section along the axial direction of the first gas supply pipe, and are located in the steel pipe welding Seam just above.
The high-frequency straight seam welding device for steel pipe production according to claim 2 or 3, wherein the end of the gas supply section is a closed end.
The high-frequency straight seam welding device for steel pipe production according to claim 1, wherein the sealing cover comprises a first column, a second column, a third column, a fourth column, and a top end of the four columns. The connected top cover is provided with a welding seat closing plate between the first column and the second column, an extrusion seat closing plate between the second column and the third column, and between the third column and the fourth column. A guide seat closing plate is provided, and a high frequency seat closing plate is arranged between the fourth column and the first column.
The high-frequency straight seam welding device for steel pipe production according to claim 5, wherein the welding seat closing plate is fixed on the first pillar and the second pillar by screws, and the guide seat closing plate passes through multiple A screw is fixed on the third pillar and the fourth pillar.
A high-frequency straight seam welding device for steel pipe production according to claim 6, characterized in that the middle and lower parts of the welding seat closing plate and the guide seat closing plate are oppositely provided with openings, and the openings are respectively formed by detachable first plates. A closing block and a second closing block are closed, the first closing block and the second closing block are oppositely provided with holes for the steel pipe to pass through, and the first closing block and the second closing block are respectively fixed to each other by a plurality of screws. The welding seat closing plate is oriented as the outer side of the closing plate.
A high-frequency straight seam welding device for steel pipe production according to claim 6 or 7, wherein the screw is an eyebolt screw.
The high-frequency straight seam welding device for steel pipe production according to claim 5, wherein the closing plate of the extrusion seat comprises a lower plate, an upper left plate and an upper right plate, and the front end seat at the bottom of the extrusion seat And the rear end seat is located on the outer side of the extruded seat closing plate and the high frequency seat closing plate.
A high-frequency straight seam welding device for steel pipe production according to claim 1, wherein the welding seat, the extrusion seat, the high-frequency seat, the guide seat and the closing cover are all fixed to the machine base by bolts. .