CN114985876A - Welding method for pipeline welding seam - Google Patents
Welding method for pipeline welding seam Download PDFInfo
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- CN114985876A CN114985876A CN202210671637.8A CN202210671637A CN114985876A CN 114985876 A CN114985876 A CN 114985876A CN 202210671637 A CN202210671637 A CN 202210671637A CN 114985876 A CN114985876 A CN 114985876A
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- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- 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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
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- 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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Abstract
The invention provides a welding method for a pipeline welding seam, which belongs to the technical field of mechanical engineering and comprises the following steps: pickling, neutralizing and blow-drying the pipeline; filling argon into the pipeline for 10-30s, and then welding; after welding, immersing the welding seam in cooling water capable of keeping constant temperature for 20-30 seconds, taking out the pipeline from the water, and drying the inner surface and the outer surface; the temperature of the warm water is 25 +/-5 ℃; and cleaning the outer welding seam. According to the welding method for the pipeline welding seam, the stainless steel is austenite at the temperature of more than 900 ℃, is martensite at the temperature of 600-900 ℃, is transformed into austenite at the temperature of less than 600 ℃, cracks generally occur in the martensite phase after welding, the time of the welding seam in the martensite state is shortened, and the cracking rate can be reduced. Meanwhile, after the stainless steel is welded, when the surrounding temperature of the welding seam is 850-450 ℃, intergranular corrosion and chromium element loss occur, the cooling time is shortened, the chromium element loss can be reduced, and the corrosion resistance of the welding seam is enhanced.
Description
Technical Field
The invention belongs to the technical field of mechanical engineering, and particularly relates to a welding method for a pipeline welding seam.
Background
The welding seam is formed by melting and connecting the welding rod and metal at the joint seam by using the high temperature of a welding heat source. After the weld metal is cooled, the two weldment parts are connected into a whole.
The welding seam is a manufacturing process and technology for joining metal or other thermoplastic materials in a heating, high-temperature or high-pressure mode, and can be subdivided into other special welding such as gas welding, electric resistance welding, arc welding, induction welding, laser welding and the like according to the specific welding seam process, steel pipes are largely utilized in our production life, and the steel pipes can be used for pipelines, thermal equipment, machinery industry, petroleum geological drilling, containers, chemical industry and special purposes. In the process of welding seams of traditional steel pipes, spot welding is generally carried out between the steel pipes by manpower, and then seams between the steel pipes are welded.
The problem that a welding line is easy to rust in a severe corrosive environment of a stainless steel pipeline exists in the prior art.
Disclosure of Invention
The invention aims to provide a welding method for a pipeline welding seam, and aims to solve the technical problem that the stainless steel pipe welding seam in the prior art is low in corrosion resistance.
In order to achieve the purpose, the invention adopts the technical scheme that: a welding method for a pipeline welding seam is provided, which comprises the following steps:
step 1, pickling, neutralizing and blow-drying a pipeline;
step 2, filling argon into the pipeline for 10-30s, and then welding;
step 3, after welding, immersing the welding seam in cooling water capable of keeping constant temperature for 20-30 seconds, taking out the pipeline from the water, and drying the inner surface and the outer surface; the temperature of the warm water is 25 +/-5 ℃;
and 4, cleaning the outer welding line.
Preferably, the welding current parameter is 80 +/-2A and the gas flow is 8-10L/min during welding in the step 2.
Preferably, the step 1 comprises the steps of:
step 1.1, selecting the pipeline to be welded;
step 1.2, carrying out oil removal and acid washing on the pipeline;
step 1.3, washing and drying residual liquid in the inner cavity of the pipeline;
and step 1.4, cleaning the pipeline in a flow cleaning mode and drying the pipeline.
Preferably, in the step 1.4, the pipeline is washed for not less than 20s, and then dried by using compressed air of 1-2MPa for not less than 20 s.
Preferably, the implementation process of step 1.5 can be one or more of protective cap sealing, preservative film wrapping and soft foam sealing.
Preferably, cleaning the welding position by using alcohol is further included.
Preferably, when the welding seam is immersed in cooling water capable of keeping constant temperature, the water level is 3-8mm higher than the welding seam.
The welding method for the pipeline welding seam provided by the invention has the beneficial effects that: compared with the prior art, the welding method for the pipeline welding seam has the advantages that the stainless steel 1Cr18Ni9Ti is austenite at the temperature of more than 900 ℃, is martensite at the temperature of 600-900 ℃, is transformed into austenite at the temperature of less than 600 ℃, cracks generally occur in the martensite stage after welding, the time of the welding seam in the martensite state is shortened, and the cracking rate can be reduced. Meanwhile, after stainless steel is welded, when the surrounding temperature of a welding seam is 850-450 ℃, intergranular corrosion and chromium element loss occur, the cooling time is shortened, the chromium element loss can be reduced, and the corrosion resistance of the welding seam is enhanced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a block diagram illustrating a welding method for a weld of a pipeline according to an embodiment of the present invention;
FIG. 2 is a table showing the Cr content in the natural cooling and warm water cooling in the welding method for the weld joint of the pipeline according to the embodiment of the present invention; compared with welding tests in two modes of natural cooling and warm water cooling, the content of Cr element in the welding seam material adopting the warm water cooling mode is obviously improved;
FIG. 3 is a schematic diagram of an electric welding combination comparing a welding method for a pipeline welding seam with the prior art according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a welding method for a pipeline weld seam according to an embodiment of the present invention in a post-welding state compared with the prior art;
fig. 5 is a schematic diagram illustrating a comparison between a welding method for a pipeline weld joint according to an embodiment of the present invention and a post-welding internal state of the prior art.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 5, a welding method for a welding seam of a pipeline according to the present invention will now be described. The welding method for the pipeline welding seam comprises the following steps:
s1, pickling the pipeline, neutralizing and drying;
step S1 includes the following specific procedures:
s1.1, selecting the pipeline to be welded;
s1.2, carrying out oil removal and acid washing on the pipeline;
s1.3, washing and drying residual liquid in the inner cavity of the pipeline;
and S1.4, cleaning the pipeline by using flowing clear water and drying the pipeline by blowing.
In step S1.4, the pipeline is washed for not less than 20S, and then dried by using 1-2MPa compressed air for not less than 20S.
And S1.5, plugging two ends of the pipeline after cleaning.
S2, filling argon into the pipeline for 10-30S, and then welding;
in step S2, welding current parameters are 80 + -2A and gas flow is 8-10L/min during welding, so as to stabilize welding temperature.
S3, after welding, immersing the welding seam in cooling water capable of keeping constant temperature for 20-30 seconds, taking the pipeline out of the water, and drying the inner surface and the outer surface of the pipeline; the temperature of the warm water is 25 +/-5 ℃;
and S4, cleaning the outer welding seam.
Compared with the prior art, the welding method for the pipeline welding seam has the advantages that the stainless steel 1Cr18Ni9Ti is austenite at the temperature of over 900 ℃, is martensite at the temperature of 600-900 ℃, is transformed into austenite at the temperature of below 600 ℃, cracks generally occur in the martensite stage after welding, the time of the welding seam in the martensite state is shortened, and the cracking rate can be reduced. Meanwhile, after stainless steel is welded, when the surrounding temperature of a welding seam is 850-450 ℃, intergranular corrosion and chromium element loss occur, the cooling time is shortened, the chromium element loss can be reduced, and the corrosion resistance of the welding seam is enhanced.
Example 1
The specific description will be given by taking the pipe material as 1Cr18Ni9Ti, the specification phi 20X 3, and the welding mode as argon arc welding:
SS1, pickling the pipeline material;
the specific process of acid washing is as follows:
selecting a corresponding process state table according to the material of the pipeline material;
pickling, neutralizing and blow-drying the pipeline material; carrying out oil removal and acid washing on the pipeline material; washing and drying residual liquid in the inner cavity of the pipeline material;
cleaning pipeline material
Washing the inside and outside of the pipeline material (steel pipe) subjected to surface treatment by using flow cleaning within 4h, and mainly cleaning the pipe cavity of the steel pipe;
the washing time of each steel pipe is not less than 20s, then the steel pipes are dried by using 1-2MPa compressed air, and the blowing time is not less than 20 s.
The steel pipe after surface treatment is required to complete the subsequent process within 24 hours.
The surface and the inner wall of the steel pipe are free of oil stains and excess. The cleaning solution should be clean and transparent.
After cleaning, the two ends of the steel pipe are wrapped by soft foam.
SS2, filling argon into the pipeline for 10-30s, and then welding;
in this step, the welding current 80A is adjusted; the gas flow is adjusted to be 8-10L/min. And completing the welding of the steel pipe by using argon arc welding methods such as spot welding, full welding and the like.
The welding process has the following specific requirements: under the cooperation of a bench worker, the red copper core rod is practically positioned and welded by adopting argon arc welding. The welding parameters meet the requirements that the welding process specification of the stainless steel guide pipe is more than that of the stainless steel guide pipe Q/Dc 361. And after welding, the welding seam is cleaned, and the appearance is smooth and attractive. The catheter was inspected after the post-weld catheter returned to room temperature. Practical steel ball inspection, specifically, the steel ball passes through the pipe smoothly under self gravity for being qualified. The two ends of the conduit are blocked by protective blocking covers or rubber blocking covers and preservative films or packaged by soft foam and then bound by rubber bands, and then the next procedure is carried out. And (5) inspecting the welding interface, wherein cracks, air holes and inclusions are not allowed to appear at the welding position. And (4) cleaning welding slag at the welding position.
SS3, after welding, immersing the welding seam in cooling water capable of keeping constant temperature for 20-30 seconds, taking out the pipeline from the water, and drying the inner surface and the outer surface; the temperature of the warm water is 25 +/-5 ℃;
specifically, excess materials such as burrs at the opening part of the welding position are cleaned, and cleaned by alcohol; preparing an automatic temperature control water tank, setting the water temperature at 25 ℃, and setting the water level to be 3-8mm, preferably 5mm higher than the periphery of a welding line; and after welding, immersing the welding seam of the steel pipe into warm water in the automatic temperature control water tank for 20-30 seconds, taking out the steel pipe from the water, and drying the inner surface and the outer surface of the steel pipe to finish implementation.
SS4, cleaning the outer welding seam.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A welding method for pipeline welding seams is characterized by comprising the following steps:
step 1, pickling, neutralizing and blow-drying a pipeline;
step 2, filling argon into the pipeline for 10-30s, and then welding;
step 3, after welding, immersing the welding seam in cooling water capable of keeping constant temperature for 20-30 seconds, taking out the pipeline from the water, and drying the inner surface and the outer surface; the temperature of the warm water is 25 +/-5 ℃;
and 4, cleaning the outer welding line.
2. A welding method for a pipe weld according to claim 1, characterized in that: and (3) welding current parameters are 80 +/-2A during welding in the step (2), and the gas flow is 8-10L/min.
3. A welding method for a pipe weld according to claim 1, characterized in that said step 1 comprises the following steps:
step 1.1, selecting the pipeline to be welded;
step 1.2, carrying out oil removal and acid washing on the pipeline;
step 1.3, washing and drying residual liquid in the inner cavity of the pipeline;
and 1.4, cleaning the pipeline in a flow cleaning mode and drying the pipeline.
4. A welding method for a pipe weld according to claim 3, characterized in that: in the step 1.4, the pipeline is washed for not less than 20s, and then dried by using 1-2MPa compressed air for not less than 20 s.
5. A welding method for a pipe weld according to claim 3, wherein the step 1 further comprises; and step 1.5, plugging two ends of the pipeline after cleaning.
6. A welding method for a pipe weld according to claim 5, characterized in that: the implementation process of the step 1.5 can be one or more of protection blocking, wrapping with preservative film and soft foam blocking.
7. A welding method for a pipe weld according to claim 1, further comprising cleaning the weld site with alcohol.
8. A welding method for a pipe weld according to claim 1, characterized in that: when the welding seam is immersed in cooling water capable of keeping constant temperature, the water level is 3-8mm higher than the welding seam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210671637.8A CN114985876A (en) | 2022-06-14 | 2022-06-14 | Welding method for pipeline welding seam |
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| CN202210671637.8A CN114985876A (en) | 2022-06-14 | 2022-06-14 | Welding method for pipeline welding seam |
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| CN114985876A true CN114985876A (en) | 2022-09-02 |
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| CN202210671637.8A Pending CN114985876A (en) | 2022-06-14 | 2022-06-14 | Welding method for pipeline welding seam |
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Citations (6)
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|---|---|---|---|---|
| JPS5573477A (en) * | 1978-11-27 | 1980-06-03 | Mitsubishi Heavy Ind Ltd | Tig or mig automatic welding method of stainless steel pipe |
| CN101229605A (en) * | 2008-02-02 | 2008-07-30 | 泰山集团泰安市普瑞特机械制造有限公司 | Argon-arc welding for austenitic stainless steel using water cooling welding method |
| CN101586699A (en) * | 2009-06-30 | 2009-11-25 | 四川科新机电股份有限公司 | Stainless steel tube with welding bevel model, welding method and argon shield apparatus |
| CN109807433A (en) * | 2017-11-22 | 2019-05-28 | 中国商用飞机有限责任公司 | The welding processing of 304 stainless steel stents |
| CN110695499A (en) * | 2019-09-24 | 2020-01-17 | 江苏航运职业技术学院 | MAG welding process for austenitic stainless steel pipeline |
| CN113427170A (en) * | 2021-05-26 | 2021-09-24 | 江麓机电集团有限公司 | Heat dissipation device and process method for austenitic stainless steel welded by adopting water immersion method |
-
2022
- 2022-06-14 CN CN202210671637.8A patent/CN114985876A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5573477A (en) * | 1978-11-27 | 1980-06-03 | Mitsubishi Heavy Ind Ltd | Tig or mig automatic welding method of stainless steel pipe |
| CN101229605A (en) * | 2008-02-02 | 2008-07-30 | 泰山集团泰安市普瑞特机械制造有限公司 | Argon-arc welding for austenitic stainless steel using water cooling welding method |
| CN101586699A (en) * | 2009-06-30 | 2009-11-25 | 四川科新机电股份有限公司 | Stainless steel tube with welding bevel model, welding method and argon shield apparatus |
| CN109807433A (en) * | 2017-11-22 | 2019-05-28 | 中国商用飞机有限责任公司 | The welding processing of 304 stainless steel stents |
| CN110695499A (en) * | 2019-09-24 | 2020-01-17 | 江苏航运职业技术学院 | MAG welding process for austenitic stainless steel pipeline |
| CN113427170A (en) * | 2021-05-26 | 2021-09-24 | 江麓机电集团有限公司 | Heat dissipation device and process method for austenitic stainless steel welded by adopting water immersion method |
Non-Patent Citations (1)
| Title |
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| 宗涛;李卫国;施海斌;潘总;: "奥氏体不锈钢的全自动气体保护焊焊接工艺试验", 中国化工装备 * |
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