CN116252104A - Welding forming process for thin-wall steel pipe - Google Patents
Welding forming process for thin-wall steel pipe Download PDFInfo
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- CN116252104A CN116252104A CN202210380340.6A CN202210380340A CN116252104A CN 116252104 A CN116252104 A CN 116252104A CN 202210380340 A CN202210380340 A CN 202210380340A CN 116252104 A CN116252104 A CN 116252104A
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- pipe
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 238000003466 welding Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000008569 process Effects 0.000 title claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 39
- 238000005498 polishing Methods 0.000 claims abstract description 21
- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 238000007493 shaping process Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000006698 induction Effects 0.000 claims abstract description 13
- 238000005452 bending Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 238000010791 quenching Methods 0.000 claims abstract description 9
- 230000000171 quenching effect Effects 0.000 claims abstract description 9
- 238000009966 trimming Methods 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims abstract description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000000110 cooling liquid Substances 0.000 claims description 8
- 238000002386 leaching Methods 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a welding forming process of a thin-wall steel pipe, which comprises the following steps: step 1, polishing welded edges on two sides of a steel plate according to process requirements to form a slope surface, and integrally polishing to remove surface rust and ash after polishing; step 2, the pretreated steel plate is sent into a bending mechanism, the thin-wall steel plate is bent into a tube shape under the continuous action of a plurality of groups of rollers, and welding edges at two sides are aligned in parallel; step 3, preheating the bent and sized steel pipe to more than 800 ℃, and then entering a high-frequency induction welding area for welding; cooling the welded pipe body by continuously passing the welded pipe body through an industrial medium cooling area and a pure water cooling area, wherein the industrial medium is water-soluble quenching agent; and 5, straightening the cooled pipe by a special straightening and shaping mechanism, and trimming the pipe into a finished round pipe by a plurality of groups of shaping guide rollers. Through the mode, the stability of the welding process can be enhanced, the stress during weld joint trimming can be reduced, and the overall quality can be improved.
Description
Technical Field
The invention relates to the field of steel tube processing, in particular to a welding forming process of a thin-wall steel tube.
Background
The thin-wall steel pipe is a common structural material of an electric power tower, the conventional thin-wall steel pipe is thinner in wall thickness in the production process, the bulge of a welded joint position is obvious after welding, the final forming of the steel pipe is easy to influence in the process of processing the welded joint, even the welding joint is brittle due to overlarge stress of the welded joint caused by unmatched polishing force and the running speed of the steel pipe on the production line, and the whole welding quality is influenced.
Disclosure of Invention
The invention mainly solves the technical problem of providing a welding forming process for thin-wall steel pipes, which can improve the stability of welding positions.
In order to solve the technical problems, the invention adopts a technical scheme that: the welding and forming process of the thin-wall steel pipe comprises the following steps:
step 1, preprocessing a steel plate, namely selecting a thin-wall steel plate according to the process requirement, polishing welded edges on two sides of the steel plate to form a slope surface with the slope surface height of 0.4-06 mm, and integrally polishing to remove surface rust and ash after polishing is finished;
step 2, a bending sizing procedure is carried out, wherein the pretreated steel plate is sent into a bending mechanism, the thin-wall steel plate is bent into a tube shape under the continuous action of a plurality of groups of rollers, and welding edges at two sides are aligned in parallel;
step 3, preheating the bent and sized steel pipe to be more than 800 ℃ in a heating and welding process, and then entering a high-frequency induction welding area for welding;
the welded pipe body is cooled by continuously passing through an industrial medium cooling area and a pure water cooling area after the steel pipe is welded in the cooling step 4, wherein the industrial medium is water-soluble quenching agent;
and 5, straightening the cooled pipe in the straightening and shaping process by a special straightening and shaping mechanism, and trimming the pipe into a finished round pipe by a plurality of groups of shaping guide rollers.
In a preferred embodiment of the present invention, the angle of the slope surface is 30 to 45 °.
In a preferred embodiment of the present invention, the preheating process in the step 3 is a secondary preheating, wherein the temperature of the first preheating is 300-500 ℃, and the temperature of the secondary preheating is 800-900 ℃.
In a preferred embodiment of the present invention, the industrial medium cooling area is cooled by spraying, the cooling temperature of the cooling liquid is 50-60 ℃, the pure water cooling mode is flow cooling, and the cooling temperature is normal temperature.
In a preferred embodiment of the invention, the inlet temperature of the straightening mechanism exceeds 60 ℃.
In a preferred embodiment of the invention, a weld polishing device, a leaching mechanism and a water removal air knife are arranged in sequence before the straightening structure.
The beneficial effects of the invention are as follows: according to the invention, the production process of the existing integrated thin-wall steel pipe production line is adjusted, the steel strip is pretreated, the height of the weld joint protrusion is obviously reduced, and on the other hand, the damage to the welding position caused by structural stress due to thermal expansion and cold contraction of the steel pipe caused by severe temperature change before and after welding is reduced, so that the integral forming quality is improved.
Drawings
FIG. 1 is a schematic view of a ramp surface structure of a thin-walled steel sheet according to a preferred embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Referring to fig. 1, an embodiment of the present invention includes:
example 1:
a welding and forming process of a thin-wall steel pipe with a wall thickness of 4mm and a diameter of 30mm, wherein the welding and forming process of the thin-wall steel pipe with the specification comprises the following steps:
step 1, pre-treating a steel plate, namely selecting a processed thin-wall steel plate with the thickness of 4mm according to the technological requirement, polishing welded edges on two sides of the steel plate to form a slope surface with the slope surface height of 0.4-0.6 mm, wherein an included angle between the slope surface and the plane of the steel plate is 30 degrees, and polishing integrally to remove surface rust and ash after polishing is finished;
step 2, a bending sizing procedure is carried out, wherein the pretreated steel plate is sent into a bending mechanism, the thin-wall steel plate is bent into a tube shape under the continuous action of a plurality of groups of rollers, and welding edges at two sides are aligned in parallel;
step 3, preheating the bent and sized steel pipe to be more than 800 ℃ in a heating and welding process, and then entering a high-frequency induction welding area for welding;
the welded pipe body is cooled by continuously passing through an industrial medium cooling area and a pure water cooling area after the steel pipe is welded in the cooling step 4, wherein the industrial medium is water-soluble quenching agent;
and 5, straightening the cooled pipe in the straightening and shaping process by a special straightening and shaping mechanism, then trimming the pipe into a finished round pipe by a plurality of groups of shaping guide rollers, and sequentially arranging a weld polishing device, a leaching mechanism and a dewatering air knife before the straightening structure, so that weld trimming and surface dewatering can be finished before straightening, the inlet temperature of the pipe entering the straightening mechanism can be increased to above 60 ℃ by adjusting the production speed and the pure water cooling length, the deformation resistance in straightening and shaping is reduced, and the structural stability after shaping is improved.
The preheating process in the step 3 is secondary preheating, wherein the temperature of the first preheating is 300-400 ℃, the temperature of the secondary preheating is 800-900 ℃, the secondary preheating is heated by an induction heater, the distance between the first induction heating ring and the second induction heating ring is 10 cm-15 cm, the distance between the second induction heating ring and the high-frequency welding head is 5-8 cm, and the temperature change gradient of a welding position is reduced by the secondary heating, the influence of welding actions on structures around a welding seam is reduced, so that the welding seam is firmer.
The industrial medium cooling area is cooled by spraying, the cooling temperature of the cooling liquid is 50-60 ℃, the pure water cooling mode is flow cooling, and the cooling temperature is normal temperature. The reason for adopting the cooling mode is that the reverse dissolution temperature of the water-soluble quenching agent serving as industrial medium cooling liquid is generally 70-80 ℃, the occurrence speed of the reverse dissolution of the medium can be improved by increasing the temperature of the cooling liquid to 50-60 ℃, and the liquid organic polymer in the water-soluble quenching agent can be deposited on the metal surface rapidly while the temperature is reduced rapidly, so that a protective film is formed, and the surface quality of the steel pipe is improved.
Example 2
A welding and forming process of a thin-wall steel pipe with a wall thickness of 5mm and a diameter of 34mm, wherein the welding and forming process of the thin-wall steel pipe with the specification comprises the following steps:
step 1, preprocessing a steel plate, namely selecting a processed thin-wall steel plate with the thickness of 5mm according to the technological requirement, polishing welded edges on two sides of the steel plate to form a slope surface with the slope surface height of 0.4-0.6 mm, wherein an included angle between the slope surface and the plane of the steel plate is 45 degrees, and polishing integrally to remove surface rust and ash after polishing is finished;
step 2, a bending sizing procedure is carried out, wherein the pretreated steel plate is sent into a bending mechanism, the thin-wall steel plate is bent into a tube shape under the continuous action of a plurality of groups of rollers, and welding edges at two sides are aligned in parallel;
step 3, preheating the bent and sized steel pipe to be more than 800 ℃ in a heating and welding process, and then entering a high-frequency induction welding area for welding;
the welded pipe body is cooled by continuously passing through an industrial medium cooling area and a pure water cooling area after the steel pipe is welded in the cooling step 4, wherein the industrial medium is water-soluble quenching agent;
and 5, straightening the cooled pipe in the straightening and shaping process by a special straightening and shaping mechanism, then trimming the pipe into a finished round pipe by a plurality of groups of shaping guide rollers, and sequentially arranging a weld polishing device, a leaching mechanism and a dewatering air knife before the straightening structure, so that weld trimming and surface dewatering can be finished before straightening, the inlet temperature of the pipe entering the straightening mechanism can be increased to above 60 ℃ by adjusting the production speed and the pure water cooling length, the deformation resistance in straightening and shaping is reduced, and the structural stability after shaping is improved.
The preheating process in the step 3 is secondary preheating, wherein the temperature of the first preheating is 400-500 ℃, the temperature of the secondary preheating is 800-900 ℃, the secondary preheating is heated by an induction heater, the distance between the first induction heating ring and the second induction heating ring is 15 cm-20 cm, the distance between the second induction heating ring and the high-frequency welding head is 5-8 cm, and the temperature change gradient of a welding position is reduced by the secondary heating, the influence of welding actions on structures around a welding seam is reduced, so that the welding seam is firmer.
The industrial medium cooling area is cooled by spraying, the cooling temperature of the cooling liquid is 50-60 ℃, the pure water cooling mode is flow cooling, and the cooling temperature is normal temperature. The reason for adopting the cooling mode is that the reverse dissolution temperature of the water-soluble quenching agent serving as industrial medium cooling liquid is generally 70-80 ℃, the occurrence speed of the reverse dissolution of the medium can be improved by increasing the temperature of the cooling liquid to 50-60 ℃, and the liquid organic polymer in the water-soluble quenching agent can be deposited on the metal surface rapidly while the temperature is reduced rapidly, so that a protective film is formed, and the surface quality of the steel pipe is improved.
In the forming process of the thin-wall steel pipes produced in the modes of the embodiment 1 and the embodiment 2, the highest position of the welding slag surface bulge at the welding seam is not more than 0.5mm, the requirement of subsequent polishing is obviously reduced, the welding quality is stable and efficient, and few leakage points exist in the water pressure test.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.
Claims (6)
1. The welding and forming process of the thin-wall steel pipe is characterized by comprising the following steps of:
step 1, preprocessing a steel plate, namely selecting a thin-wall steel plate according to the process requirement, polishing welded edges on two sides of the steel plate to form a slope surface with the slope surface height of 0.4-06 mm, and integrally polishing to remove surface rust and ash after polishing is finished;
step 2, a bending sizing procedure is carried out, wherein the pretreated steel plate is sent into a bending mechanism, the thin-wall steel plate is bent into a tube shape under the continuous action of a plurality of groups of rollers, and welding edges at two sides are aligned in parallel;
step 3, preheating the bent and sized steel pipe to be more than 800 ℃ in a heating and welding process, and then entering a high-frequency induction welding area for welding;
the welded pipe body is cooled by continuously passing through an industrial medium cooling area and a pure water cooling area after the steel pipe is welded in the cooling step 4, wherein the industrial medium is water-soluble quenching agent;
and 5, straightening the cooled pipe in the straightening and shaping process by a special straightening and shaping mechanism, and trimming the pipe into a finished round pipe by a plurality of groups of shaping guide rollers.
2. The welding forming process of a thin-walled steel pipe according to claim 1, wherein the angle of the slope surface is 30-45 °.
3. The welding and forming process of a thin-walled steel pipe according to claim 1, wherein the preheating in the step 3 is a secondary preheating, wherein the temperature of the first preheating is 300-500 ℃, and the temperature of the secondary preheating is 800-900 ℃.
4. The welding forming process of the thin-wall steel pipe according to claim 1, wherein the industrial medium cooling area is cooled by spraying, the cooling temperature of the cooling liquid is 50-60 ℃, the pure water cooling mode is flow cooling, and the cooling temperature is normal temperature.
5. A process for welding and forming a thin-walled steel pipe according to claim 1 wherein the inlet temperature of the straightening mechanism exceeds 60 ℃.
6. The welding forming process of the thin-wall steel pipe according to claim 1, wherein a welding line polishing device, a leaching mechanism and a water removal air knife are sequentially arranged in front of the straightening structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210380340.6A CN116252104A (en) | 2022-04-12 | 2022-04-12 | Welding forming process for thin-wall steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210380340.6A CN116252104A (en) | 2022-04-12 | 2022-04-12 | Welding forming process for thin-wall steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116252104A true CN116252104A (en) | 2023-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210380340.6A Pending CN116252104A (en) | 2022-04-12 | 2022-04-12 | Welding forming process for thin-wall steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116252104A (en) |
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2022
- 2022-04-12 CN CN202210380340.6A patent/CN116252104A/en active Pending
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