CN112372254A - Welding process of steel pipe for building - Google Patents
Welding process of steel pipe for building Download PDFInfo
- Publication number
- CN112372254A CN112372254A CN202011316436.3A CN202011316436A CN112372254A CN 112372254 A CN112372254 A CN 112372254A CN 202011316436 A CN202011316436 A CN 202011316436A CN 112372254 A CN112372254 A CN 112372254A
- Authority
- CN
- China
- Prior art keywords
- welding
- steel pipe
- steel
- pipe
- steel pipes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 151
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 103
- 239000010959 steel Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000010276 construction Methods 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- CPSYWNLKRDURMG-UHFFFAOYSA-L hydron;manganese(2+);phosphate Chemical compound [Mn+2].OP([O-])([O-])=O CPSYWNLKRDURMG-UHFFFAOYSA-L 0.000 claims abstract description 7
- 239000012535 impurity Substances 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 7
- 238000005498 polishing Methods 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 7
- 238000009966 trimming Methods 0.000 claims abstract description 7
- 238000004321 preservation Methods 0.000 claims abstract description 6
- 238000010583 slow cooling Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 241000755266 Kathetostoma giganteum Species 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Heat Treatment Of Articles (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a welding process of a steel tube for construction, which comprises the following steps: cleaning the welding part before welding, removing impurities such as rust, oil stain and the like, polishing important parts to be smooth and clean, and then wiping the important parts for later use; respectively placing two steel pipes on two welding roller frames, and adjusting the welding seam distance of the two steel pipes; the steel pipe is driven to rotate by the welding roller carrier; adjusting a welding gun on the welding machine to be positioned in the center of the welding seam and in the direction deviating from the center of the steel pipe by 40 mm; respectively carrying out external welding and internal welding on the welding seams of the two steel pipes by using an automatic welding frame; soaking the steel pipe in a manganese phosphate phosphating solution for phosphating, and performing pipe end flat head processing on the steel pipe; immediately performing heat treatment after welding the steel pipe with the machined pipe end, and performing heat preservation and slow cooling; and then straightening, finishing and trimming the steel pipe. The steel pipe welded by the invention has high processing precision and stable quality, and the straightness of the common steel pipe is lower than 1 mm/m.
Description
Technical Field
The invention relates to the technical field of steel pipe welding, in particular to a welding process of a steel pipe for a building.
Background
Steel pipes are steel with a hollow cross section whose length is much greater than the diameter or circumference. The steel pipe is divided into round, square, rectangular and special-shaped steel pipes according to the shape of the cross section; the steel pipe is divided into a carbon structural steel pipe, a low-alloy structural steel pipe, an alloy steel pipe and a composite steel pipe according to the material quality; the steel pipes are divided into steel pipes for conveying pipelines, engineering structures, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment and the like according to the application; in many occasions, two steel pipes need to be welded together due to the length, the existing welding process is formed by manually melting and connecting welding flux and metal at a joint at the welding seam, and after the welding seam is cooled, the two steel pipes are connected into a whole.
The invention provides a welding process of a steel pipe for a building, aiming at improving the safety of the welded steel pipe for the building.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a welding process of a steel pipe for a building.
The technical scheme of the invention is as follows:
a welding process of a steel tube for construction comprises the following steps:
A. cleaning the welding part before welding, removing impurities such as rust, oil stain and the like, polishing important parts to be smooth and clean, and then wiping the important parts for later use;
B. respectively placing two steel pipes on two welding roller frames, and adjusting the welding seam distance of the two steel pipes to be 10-12 mm;
C. the steel pipe is driven to rotate for 3-4 circles per minute by a welding roller carrier;
D. adjusting a welding gun on a welding machine to be positioned in the center of a welding seam and in a direction deviating 40mm from the center of the steel pipe, wherein the deviation direction of the welding gun is consistent with the rotation direction of the steel pipe;
E. respectively carrying out outer welding and inner welding on the welding seams of the two steel pipes by using an automatic welding frame, wherein the current of a welding machine on the automatic welding frame during the outer welding is 650-700A, the voltage is 40V, the current of the welding machine on the automatic welding frame during the inner welding is 800A, and the voltage is 45V;
F. soaking the steel pipe in a manganese phosphate phosphating solution of 30-40 mi;
G. pipe end processing, namely performing pipe end flat-head processing on the steel pipe;
H. heat treatment, namely uniformly heating the welded steel pipe with the machined pipe end to 260-300 ℃ and carrying out heat preservation and slow cooling;
I. straightening, wherein the straightness accuracy allowed by the standard can be achieved only after the straightening;
J. finishing, namely forcibly and accurately shaping by using a die; and (5) trimming the end to smooth the end of the steel pipe.
Preferably, in the step E, during welding, a protective gas is used to protect the welding point.
Further preferably, the protective gas is argon or nitrogen.
Preferably, in the step H, the time for reducing the temperature of the welded steel pipe from 260-300 ℃ to the normal temperature is 60-90 min.
The invention has the advantages that: the invention relates to a welding process of a steel pipe for construction, which comprises the following steps: cleaning the welding part before welding, removing impurities such as rust, oil stain and the like, polishing important parts to be smooth and clean, and then wiping the important parts for later use; respectively placing two steel pipes on two welding roller frames, and adjusting the welding seam distance of the two steel pipes to be 10-12 mm; the steel pipe is driven to rotate for 3-4 circles per minute by a welding roller carrier; adjusting a welding gun on a welding machine to be positioned in the center of a welding seam and in a direction deviating 40mm from the center of the steel pipe, wherein the deviation direction of the welding gun is consistent with the rotation direction of the steel pipe; respectively carrying out external welding and internal welding on the welding seams of the two steel pipes by using an automatic welding frame; and soaking the steel pipe in a manganese phosphate phosphating solution for phosphating, and then performing pipe end processing, heat treatment, straightening, finishing and end trimming. The steel pipe welded by the invention has high processing precision and stable quality, and the straightness of the common steel pipe is lower than 1 mm/m.
Detailed Description
Example 1
A welding process of a steel tube for construction comprises the following steps:
A. cleaning the welding part before welding, removing impurities such as rust, oil stain and the like, polishing important parts to be smooth and clean, and then wiping the important parts for later use;
B. respectively placing two steel pipes on two welding roller frames, and adjusting the welding seam distance of the two steel pipes to be 10-12 mm;
C. the steel pipe is driven to rotate for 3 circles per minute by a welding roller carrier;
D. adjusting a welding gun on a welding machine to be positioned in the center of a welding seam and in a direction deviating 40mm from the center of the steel pipe, wherein the deviation direction of the welding gun is consistent with the rotation direction of the steel pipe;
E. respectively carrying out outer welding and inner welding on the welding seams of the two steel pipes by using an automatic welding frame, wherein the current of a welding machine on the automatic welding frame during the outer welding is 680A, the voltage is 40V, and the current of the welding machine on the automatic welding frame during the inner welding is 800A, and the voltage is 45V;
F. soaking the steel pipe in a manganese phosphate phosphating solution 35 mi;
G. pipe end processing, namely performing pipe end flat-head processing on the steel pipe;
H. heat treatment, namely, uniformly heating the welded steel pipe with the machined pipe end to 275 ℃, and carrying out heat preservation and slow cooling;
I. straightening, wherein the straightness accuracy allowed by the standard can be achieved only after the straightening;
J. finishing, namely forcibly and accurately shaping by using a die; and (5) trimming the end to smooth the end of the steel pipe.
And E, protecting the welding point by using protective gas during welding.
The protective gas is argon.
In the step H, the time for reducing the temperature of the welded steel pipe from 275 ℃ to normal temperature is 70 min.
Example 2
A welding process of a steel tube for construction comprises the following steps:
A. cleaning the welding part before welding, removing impurities such as rust, oil stain and the like, polishing important parts to be smooth and clean, and then wiping the important parts for later use;
B. respectively placing two steel pipes on two welding roller frames, and adjusting the welding seam distance of the two steel pipes to be 10-12 mm;
C. the steel pipe is driven to rotate for 3 circles per minute by a welding roller carrier;
D. adjusting a welding gun on a welding machine to be positioned in the center of a welding seam and in a direction deviating 40mm from the center of the steel pipe, wherein the deviation direction of the welding gun is consistent with the rotation direction of the steel pipe;
E. respectively carrying out outer welding and inner welding on the welding seams of the two steel pipes by using an automatic welding frame, wherein the current of a welding machine on the automatic welding frame during the outer welding is 700A, the voltage is 40V, and the current of the welding machine on the automatic welding frame during the inner welding is 800A, and the voltage is 45V;
F. soaking the steel pipe in a manganese phosphate phosphating solution 30 mi;
G. pipe end processing, namely performing pipe end flat-head processing on the steel pipe;
H. heat treatment, namely, uniformly heating the welded steel pipe with the machined pipe end to 300 ℃, and carrying out heat preservation and slow cooling;
I. straightening, wherein the straightness accuracy allowed by the standard can be achieved only after the straightening;
J. finishing, namely forcibly and accurately shaping by using a die; and (5) trimming the end to smooth the end of the steel pipe.
And E, protecting the welding point by using protective gas during welding.
The protective gas is argon.
And in the step H, the time for reducing the temperature of the welded steel pipe from 300 ℃ to normal temperature is 90 min.
Example 3
A welding process of a steel tube for construction comprises the following steps:
A. cleaning the welding part before welding, removing impurities such as rust, oil stain and the like, polishing important parts to be smooth and clean, and then wiping the important parts for later use;
B. respectively placing two steel pipes on two welding roller frames, and adjusting the welding seam distance of the two steel pipes to be 10-12 mm;
C. the steel pipe is driven to rotate for 3 circles per minute by a welding roller carrier;
D. adjusting a welding gun on a welding machine to be positioned in the center of a welding seam and in a direction deviating 40mm from the center of the steel pipe, wherein the deviation direction of the welding gun is consistent with the rotation direction of the steel pipe;
E. respectively carrying out outer welding and inner welding on the welding seams of the two steel pipes by using an automatic welding frame, wherein the current of a welding machine on the automatic welding frame during the outer welding is 650A, the voltage is 40V, and the current of the welding machine on the automatic welding frame during the inner welding is 800A, and the voltage is 45V;
F. soaking the steel pipe in a manganese phosphate phosphating solution 40 mi;
G. pipe end processing, namely performing pipe end flat-head processing on the steel pipe;
H. heat treatment, namely, uniformly heating the welded steel pipe with the machined pipe end to 260 ℃, and carrying out heat preservation and slow cooling;
I. straightening, wherein the straightness accuracy allowed by the standard can be achieved only after the straightening;
J. finishing, namely forcibly and accurately shaping by using a die; and (5) trimming the end to smooth the end of the steel pipe.
And E, protecting the welding point by using protective gas during welding.
The protective gas is nitrogen.
And in the step H, the time for reducing the welded steel pipe from 260 ℃ to normal temperature is 60 min.
The steel pipes for construction after welding in examples 1-3 all have straightness lower than 1mm/m and average 0.058 mm/m.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A welding process of a steel tube for construction is characterized by comprising the following steps:
A. cleaning the welding part before welding, removing impurities such as rust, oil stain and the like, polishing important parts to be smooth and clean, and then wiping the important parts for later use;
B. respectively placing two steel pipes on two welding roller frames, and adjusting the welding seam distance of the two steel pipes to be 10-12 mm;
C. the steel pipe is driven to rotate for 3-4 circles per minute by a welding roller carrier;
D. adjusting a welding gun on a welding machine to be positioned in the center of a welding seam and in a direction deviating 40mm from the center of the steel pipe, wherein the deviation direction of the welding gun is consistent with the rotation direction of the steel pipe;
E. respectively carrying out outer welding and inner welding on the welding seams of the two steel pipes by using an automatic welding frame, wherein the current of a welding machine on the automatic welding frame during the outer welding is 650-700A, the voltage is 40V, the current of the welding machine on the automatic welding frame during the inner welding is 800A, and the voltage is 45V;
F. soaking the steel pipe in a manganese phosphate phosphating solution of 30-40 mi;
G. pipe end processing, namely performing pipe end flat-head processing on the steel pipe;
H. heat treatment, namely uniformly heating the welded steel pipe with the machined pipe end to 260-300 ℃ and carrying out heat preservation and slow cooling;
I. straightening, wherein the straightness accuracy allowed by the standard can be achieved only after the straightening;
J. finishing, namely forcibly and accurately shaping by using a die; and (5) trimming the end to smooth the end of the steel pipe.
2. A process for welding a steel pipe for construction as set forth in claim 1, wherein in said step a, said step E, a protective gas is used to protect the welded spot during welding.
3. A welding process for steel tubes for construction as claimed in claim 2, wherein said shielding gas is argon or nitrogen.
4. The welding process of steel tube for construction as claimed in claim 1, wherein in the step H, the time for lowering the welded steel tube from 260-300 ℃ to normal temperature is 60-90 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011316436.3A CN112372254A (en) | 2020-11-23 | 2020-11-23 | Welding process of steel pipe for building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011316436.3A CN112372254A (en) | 2020-11-23 | 2020-11-23 | Welding process of steel pipe for building |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112372254A true CN112372254A (en) | 2021-02-19 |
Family
ID=74587219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011316436.3A Pending CN112372254A (en) | 2020-11-23 | 2020-11-23 | Welding process of steel pipe for building |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112372254A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2163340A1 (en) * | 2001-11-21 | 2010-03-17 | Dana Canada Corporation | Improvements in fluxless brazing |
| CN102294572A (en) * | 2010-06-25 | 2011-12-28 | 上海月月潮钢管制造有限公司 | Method for manufacturing high-temperature and high-pressure steel pipe |
| CN105986110A (en) * | 2015-01-31 | 2016-10-05 | 重庆麦卡瑞机械制造有限公司 | Postweld heat treatment process for steel pipe |
| CN106811745A (en) * | 2015-11-30 | 2017-06-09 | 广汉市川西机电备件有限责任公司 | A kind of steel tube surface handling process |
| CN110722279A (en) * | 2019-09-11 | 2020-01-24 | 珠海东方重工有限公司 | Steel pipe butt welding process |
-
2020
- 2020-11-23 CN CN202011316436.3A patent/CN112372254A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2163340A1 (en) * | 2001-11-21 | 2010-03-17 | Dana Canada Corporation | Improvements in fluxless brazing |
| CN102294572A (en) * | 2010-06-25 | 2011-12-28 | 上海月月潮钢管制造有限公司 | Method for manufacturing high-temperature and high-pressure steel pipe |
| CN105986110A (en) * | 2015-01-31 | 2016-10-05 | 重庆麦卡瑞机械制造有限公司 | Postweld heat treatment process for steel pipe |
| CN106811745A (en) * | 2015-11-30 | 2017-06-09 | 广汉市川西机电备件有限责任公司 | A kind of steel tube surface handling process |
| CN110722279A (en) * | 2019-09-11 | 2020-01-24 | 珠海东方重工有限公司 | Steel pipe butt welding process |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210219 |
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| RJ01 | Rejection of invention patent application after publication |