CN111360376A - Inert gas shielded dynamic welding without adding filler metal to pipeline - Google Patents
Inert gas shielded dynamic welding without adding filler metal to pipeline Download PDFInfo
- Publication number
- CN111360376A CN111360376A CN202010168878.1A CN202010168878A CN111360376A CN 111360376 A CN111360376 A CN 111360376A CN 202010168878 A CN202010168878 A CN 202010168878A CN 111360376 A CN111360376 A CN 111360376A
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- CN
- China
- Prior art keywords
- welding
- pipeline
- joint
- argon
- protection
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Classifications
-
- 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
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
-
- 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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
- B23K9/0052—Welding of pipe panels
-
- 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
-
- 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
- B23K9/32—Accessories
-
- 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
Abstract
The invention discloses a dynamic welding method for pipelines without adding filler metal and inert gas protection. Cutting the pipeline by using a pipe cutting machine, and scraping burrs generated by cutting the pipeline by using a scraper; butting the cut pipelines, and fixing the pipeline connection position through a pipeline clamp; a paper adhesive tape is attached to the joint of the pipelines for protection; filling argon into the assembled pipeline; taking down the paper adhesive tape, wiping the joint of the pipeline by using acetone, installing a tungsten-grade inert gas shielded welding clamp after wiping is finished, and aligning the tungsten grade of a welding gun to the joint of the pipeline; sealing the welding fixture, and filling argon gas between the welding fixture and the outer surface of the pipeline for protection; starting a direct current power supply, and performing inert gas shielded welding on the joint of the pipeline by using a welding gun; and after welding is finished, the welding fixture is disassembled, nondestructive testing is carried out on the welding seam on the pipeline, and the two ends of the pipeline are plugged after the welding seam is qualified. The invention improves the strength of the welding line, improves the quality of the pipeline and ensures that the pipeline can normally convey liquid raw materials for production.
Description
The technical field is as follows:
the invention belongs to the technical field of pipeline production, and particularly relates to an inert gas shielded arc welding method for pipelines without adding filler metal.
Background art:
in the production process of spices, beverage, food, often need to carry liquid raw materials, to the requirement of conveying pipe is stricter, and the conveying pipe needs to be kept off with the outside air, prevents that liquid raw materials from oxidizing or polluting. Because the general length of pipeline is longer, and single pipeline is difficult to satisfy length, generally forms by many pipeline welding, and when using, the welding department is because fill solder welding back, and intensity reduces, often can take place the condition of leaking, and how to improve pipeline welding quality is the problem that people need solve.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
The invention content is as follows:
the invention aims to provide the inert gas shielded arc welding method for pipelines without adding filler metal, thereby overcoming the defects in the prior art.
In order to realize the purpose, the invention provides a power welding machine without adding filling metal inert gas protection to a pipeline, which comprises the following steps:
(1) cutting the pipeline by using a pipe cutting machine, and scraping burrs generated by cutting the pipeline by using a scraper;
(2) butting the pipelines cut in the step (1), and fixing the pipeline connection position through a pipeline clamp;
(3) the paper adhesive tape is attached to the joint of the pipeline for protection, so that dust and impurities are prevented from entering the pipeline;
(4) filling argon into the assembled pipeline, wherein the flow of the argon is 3-6L/min;
(5) taking down the paper adhesive tape, wiping the joint of the pipeline by using acetone, installing a tungsten-grade inert gas shielded welding clamp after wiping is finished, aligning the tungsten grade of a welding gun to the joint of the pipeline, wherein the diameter of the tungsten grade is phi 2.5mm, and the diameter of a nozzle of the welding gun is phi 8 mm;
(6) sealing the welding fixture, and filling argon gas between the welding fixture and the outer surface of the pipeline for protection, wherein the flow of the argon gas is 5-7L/min;
(7) starting a direct current power supply, and performing inert gas shielded welding on the pipeline joint by using a welding gun, wherein the welding current range is 140-160A, the arc voltage of the welding gun is 8-10V, and the welding speed is 42-52 cm/min;
(8) after welding, waiting for 1 minute, continuing argon filling protection, then disassembling the welding clamp, carrying out nondestructive testing on the welding line on the pipeline, and plugging the two ends of the pipeline after the welding is qualified.
Preferably, in the technical scheme, in the step (2), after the pipeline clamp fixes the pipeline joint, the pipeline joint is fixed by spot welding, and argon is filled for protection during spot welding.
Preferably, in the technical scheme, in the step (4), after argon gas is filled in the pipeline, a welding opening is added at the tail end of the pipeline to serve as a sample, the sample welding opening is welded firstly, and after the welding is qualified, the sample is taken down, and the number date and the number of a welder are stored in a sample storage area.
Preferably, in the technical scheme, in the step (7), the pipeline is preheated before welding, and the preheating temperature is 150 ℃.
Preferably, in the technical scheme, in the step (8), after the pipeline welding is finished and the welding clamp is disassembled, the inner surface of the welding seam of the pipeline is inspected by using an endoscope, and after the welding seam is qualified, the outer surface of the welding seam is subjected to nondestructive testing.
Compared with the prior art, the invention has the following beneficial effects:
the inner surface and the outer surface of the welded part of the pipeline are protected by inert gas, filling metal solder is not required to be added during welding, the strength of a welding seam is guaranteed after welding, the quality of the pipeline is improved, and the pipeline can normally convey liquid raw materials to produce.
Description of the drawings:
FIG. 1 argon flow Q in the tube1A curve diagram of the change of the welding seam strength;
FIG. 2 flow Q of argon outside the pipe2A curve diagram of the change of the welding seam strength;
FIG. 3 is a graph showing a comparison of welding current A, welding torch arc voltage V, and welding speed S;
FIG. 4 is a graph showing the change of the welding speed S and the strength of the weld.
The specific implementation mode is as follows:
the following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
A kind of pipeline does not add the dynamic welding of metal inert gas protection, its step is:
(1) cutting a pipeline by using a pipe cutting machine, wherein the diameter of the pipeline is phi 23mm, the flatness of the section of the pipeline is ensured, and burrs generated by cutting on the pipeline are scraped by using a scraper;
(2) butting the pipelines cut in the step (1), wherein the gap of the joint of the pipelines is 1.5mm, fixing the joint of the pipelines by pipeline clamps to ensure that the butted misalignment is within a reasonable range, fixing the joint of the pipelines by spot welding by a welder holding the qualification certificate of a pressure welder to ensure that the welded junction can not have misalignment before welding, and filling argon for protection during spot welding;
(3) the paper adhesive tape is attached to the joint of the pipelines, and the welding is started after all the pipelines are assembled completely instead of one welding group, so that the welding opening needs to be protected to prevent foreign matters such as dust from entering the pipelines;
(4) filling argon into the assembled pipeline, wherein the argon flow is 3-6L/min, adding a welding opening at the tail end of the pipeline as a sample, welding the sample welding opening firstly, taking down the sample after the welding is qualified, numbering the date and the number of a welder, and storing the number and the number in a sample storage area;
(5) taking down the paper adhesive tape, wiping the joint of the pipeline by using acetone and non-woven fabrics, installing a tungsten-grade inert gas shielded welding fixture after wiping, aligning the tungsten grade of a welding gun to the joint of the pipeline, wherein the distance between the tungsten grade of the welding gun and the joint of the pipeline is 7-9mm, the diameter of the tungsten grade is phi 2.5mm, and the diameter of a nozzle of the welding gun is phi 8 mm;
(6) sealing the welding fixture, and filling argon gas between the welding fixture and the outer surface of the pipeline for protection, wherein the flow of the argon gas is 5-7L/min;
(7) the pipe is preheated before welding, and the preheating temperature is 150 ℃. Starting a direct current power supply, and performing inert gas shielded welding on the pipeline joint by using a welding gun, wherein the welding current range is 140-160A, the arc voltage of the welding gun is 8-10V, and the welding speed is 42-52 cm/min;
(8) after welding, waiting for 1 minute, continuing argon filling protection, then disassembling a welding clamp, inspecting the inner surface of the welding line of the pipeline by using an endoscope, performing nondestructive detection on the welding line on the pipeline after the welding line is qualified, and plugging two ends of the pipeline after the welding line is qualified to prevent foreign matters from entering.
Table 1: argon flow Q in pipeline1Sampling table for relation with welding seam strength
When Q is shown in FIG. 11In [3, 6 ]]In the range, the weld strength is 70% or more of the pipe strength. When Q is1When the thickness is less than 3, the argon gas cannot form a protective layer with enough thickness at the welding part. When Q is1When the pressure is higher than 6, the argon generates turbulent flow, so that air is involved, and the protection effect is influenced.
Table 2: argon flow Q outside the pipeline2Sampling table for relation with welding seam strength
When Q is shown in FIG. 22In [5, 7 ]]In the range, the weld strength is 70% or more of the pipe strength. When Q is1When the thickness is less than 5, the argon gas cannot form a protective layer with a sufficient thickness at the welded portion. When Q is1When the pressure is higher than 7, the argon generates turbulence, so that air is involved, and the protection effect is influenced.
As shown in fig. 3, the welding current a, the torch arc voltage V, and the welding speed S are in a proportional relationship, and when the welding current a is larger, the torch arc voltage V is higher, the energy output by the torch is higher, and the welding speed S is higher.
Table 3: relation sampling table of welding speed S and welding seam strength
As shown in fig. 4, when S is in the range of [42, 52], the weld strength is 70% or more of the pipe strength. When S < 42, the welding speed is too slow, productivity is low, cost is high, the heat affected zone is often brittle due to coarse overheated grains, and workpiece deformation is also large. When S is larger than 52, the welding speed is too fast, gas cannot escape in time, gas is easily generated in the welding line, and the penetration is shallow and cannot be welded.
The inner surface and the outer surface of the welded part of the pipeline are protected by inert gas, filling metal solder is not required to be added during welding, the strength of a welding seam is guaranteed after welding, the quality of the pipeline is improved, and the pipeline can normally convey liquid raw materials to produce.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (5)
1. A kind of pipeline does not add the dynamic welding of metal inert gas protection, its step is:
(1) cutting the pipeline by using a pipe cutting machine, and scraping burrs generated by cutting the pipeline by using a scraper;
(2) butting the pipelines cut in the step (1), and fixing the pipeline connection position through a pipeline clamp;
(3) a paper adhesive tape is attached to the joint of the pipelines for protection;
(4) filling argon into the assembled pipeline, wherein the flow of the argon is 3-6L/min;
(5) taking off the paper adhesive tape, wiping the joint of the pipelines by acetone, installing a tungsten-grade inert gas shielded welding clamp after wiping, aligning the tungsten grade of a welding gun to the joint of the pipelines, wherein the tungsten grade has the diameter of
The diameter of a welding gun nozzle is
(6) Sealing the welding fixture, and filling argon gas between the welding fixture and the outer surface of the pipeline for protection, wherein the flow of the argon gas is 5-7L/min;
(7) starting a direct current power supply, and performing inert gas shielded welding on the pipeline joint by using a welding gun, wherein the welding current range is 140-160A, the arc voltage of the welding gun is 8-10V, and the welding speed is 42-52 cm/min;
(8) after welding, waiting for 1 minute, continuing argon filling protection, then disassembling the welding clamp, carrying out nondestructive testing on the welding line on the pipeline, and plugging the two ends of the pipeline after the welding is qualified.
2. The gas-inert flow welding of pipes according to claim 1 without adding filler metal, characterized in that: in the step (2), after the pipeline clamp fixes the pipeline joint, the pipeline joint is fixed by spot welding, and argon is filled for protection during spot welding.
3. The gas-inert flow welding of pipes according to claim 1 without adding filler metal, characterized in that: in the step (4), after argon is filled in the pipeline, a welding opening is added at the tail end of the pipeline to serve as a sample, the sample welding opening is welded firstly, and after the welding is qualified, the sample is taken down, and the number date and the number of a welder are stored in a sample storage area.
4. The gas-inert flow welding of pipes according to claim 1 without adding filler metal, characterized in that: in step (7), the pipe is preheated to a temperature of 150 ℃ before welding.
5. The gas-inert flow welding of pipes according to claim 1 without adding filler metal, characterized in that: in the step (8), after the pipeline welding is finished and the welding clamp is disassembled, the inner surface of the pipeline welding seam is inspected by using an endoscope, and the outer surface of the welding seam is subjected to nondestructive testing after the pipeline welding seam is qualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010168878.1A CN111360376A (en) | 2020-03-12 | 2020-03-12 | Inert gas shielded dynamic welding without adding filler metal to pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010168878.1A CN111360376A (en) | 2020-03-12 | 2020-03-12 | Inert gas shielded dynamic welding without adding filler metal to pipeline |
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| CN111360376A true CN111360376A (en) | 2020-07-03 |
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| CN202010168878.1A Pending CN111360376A (en) | 2020-03-12 | 2020-03-12 | Inert gas shielded dynamic welding without adding filler metal to pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404926A (en) * | 2021-05-19 | 2021-09-17 | 大唐信阳发电有限责任公司 | Improved method and device for preventing internal leakage of high-side pressure reducing valve |
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| CN109277672A (en) * | 2018-09-17 | 2019-01-29 | 中船澄西船舶修造有限公司 | A kind of correction process of stainless steel minor diameter thin wall pipe butt welding bending deformation |
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2020
- 2020-03-12 CN CN202010168878.1A patent/CN111360376A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103317217A (en) * | 2013-03-14 | 2013-09-25 | 上海振华重工(集团)股份有限公司 | Weld pore control method for nickel-copper alloy pipes |
| CN103203559A (en) * | 2013-04-28 | 2013-07-17 | 陕西建工集团设备安装工程有限公司 | Automatic traceless fusion welding technology of thin-wall stainless steel clean pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113404926A (en) * | 2021-05-19 | 2021-09-17 | 大唐信阳发电有限责任公司 | Improved method and device for preventing internal leakage of high-side pressure reducing valve |
| CN113404926B (en) * | 2021-05-19 | 2024-04-05 | 陕煤电力信阳有限公司 | Improved method for preventing internal leakage of high-side pressure reducing valve |
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Application publication date: 20200703 |