CN115070167A - Welding process method of pipeline for ship - Google Patents
Welding process method of pipeline for ship Download PDFInfo
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- CN115070167A CN115070167A CN202210675552.7A CN202210675552A CN115070167A CN 115070167 A CN115070167 A CN 115070167A CN 202210675552 A CN202210675552 A CN 202210675552A CN 115070167 A CN115070167 A CN 115070167A
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- 238000003466 welding Methods 0.000 title claims abstract description 161
- 238000000034 method Methods 0.000 title claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 230000007547 defect Effects 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims description 24
- 229910001220 stainless steel Inorganic materials 0.000 claims description 18
- 239000010935 stainless steel Substances 0.000 claims description 18
- 238000005498 polishing Methods 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 229910052729 chemical element Inorganic materials 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 230000035515 penetration Effects 0.000 claims description 7
- 239000011324 bead Substances 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 230000004927 fusion Effects 0.000 claims description 3
- 230000002706 hydrostatic effect Effects 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 3
- 239000008213 purified water Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 238000002161 passivation Methods 0.000 claims description 2
- 238000005554 pickling Methods 0.000 claims description 2
- 238000004381 surface treatment Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 description 8
- 239000010953 base metal Substances 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 230000032798 delamination Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 flanges Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
Images
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
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a welding process method of a pipeline for a ship, which mainly comprises the following steps: selecting welding parent metal, welding a pipeline, detecting a welding seam, processing the surface of the pipeline and carrying out a pressure test. According to the invention, through a reasonable process method, the quality of the pipeline is emphatically ensured in each welding step, the problem of welding defects of the pipeline for the ship is effectively solved, the hidden danger of water leakage and water seepage generated in the operation of the welded pipeline is eliminated from the source, and the high-efficiency operation of the equipment in the design life is better ensured.
Description
Technical Field
The invention belongs to the field of welding processes, relates to a pipeline welding process method, and particularly relates to a ship pipeline welding process method.
Background
With the continuous reduction of the volume and the continuous improvement of the performance and the speed of the marine electrical equipment, the energy consumption and the heating power of electronic components and chips are increased more and more. In order to ensure high reliability of equipment operation, electronic components and chips need to be cooled, the traditional cooling mode mainly adopts air cooling for cooling, but along with rapid increase of heating power of the electronic components, the air cooling cannot meet the increasing cooling requirement. And the heat of electronic components and chips can be quickly taken away through the specific heat capacity of water by adopting a water cooling mode.
In the water cooling device, the main water channel is mainly formed by welding stainless steel pipes, flanges, elbows and the like, and the welding defects of cracks, air holes, slag inclusion, incomplete penetration, tungsten inclusion and the like mainly exist in the welding process.
In the continuous operation process of the equipment, a main water pipe needs to keep a certain pressure, if the quality of a welded pipeline cannot be guaranteed, the phenomena of water seepage, water leakage and the like of the pipeline are easily caused, and immeasurable damage is caused to electronic components and chips.
In order to solve the problems, a proper pipeline welding process method is needed to ensure the welding quality of the pipeline for the ship.
Disclosure of Invention
Aiming at the problems, the invention provides a welding process method of a pipeline for a ship, which is used for ensuring the welding quality of the pipeline and avoiding the welding defects of cracks, air holes, slag inclusion, incomplete penetration, tungsten inclusion and the like in the welding process.
The technical scheme adopted by the invention for solving the technical problems is as follows: a welding process method of a ship pipeline is used for welding the ship pipeline comprising a flange, a stainless steel pipe and an elbow, and comprises the following steps:
s1, performing appearance detection and size detection on welding parent metal including flanges, stainless steel pipes and elbows, and then performing chemical element detection;
s2, welding the pipeline: welding wires with the diameter of 1.2mm are selected to weld stainless steel pipes DN 15-DN 35, and welding wires with the diameter of 2.0mm are selected to weld stainless steel pipes DN 40-DN 80; drilling a V-shaped groove at the pipe orifice of the pipeline, removing a broken opening on the pipe orifice, removing water rust, oil stain and other dirt within the range of 20mm at the end part of the pipe orifice, polishing the dirt until the metal luster is leaked out, and then cleaning water, dust and the like by using organic solvents such as gasoline, acetone and the like to finish the pre-welding treatment; performing tack welding after the pipelines are spliced as required, and welding 3-4 points of the tack weld to ensure that the tack weld is completely welded without any defects; manual argon arc welding is adopted to finish backing welding of pipelines, the welding seam with the height of 3mm accounts for 50-80% of the total wall thickness, and an oxidation layer on the surface of the welding bead is cleaned by a steel wire brush immediately after welding; after the backing welding is finished, manual argon arc welding is adopted to finish the cover surface welding of the pipeline; cleaning and observing the surface of the welding seam after welding, and if cracks, air holes and undercut exist, polishing, repairing and re-welding are needed;
s3, detecting the welding seam: carrying out penetration flaw detection on the pipeline and then carrying out radiographic flaw detection;
s4, pipeline surface treatment: physically polishing the welded pipeline surface, and carrying out acid pickling passivation;
s5, pressure test: and (3) carrying out air pressure test on the welded pipeline firstly, and then carrying out hydrostatic test.
The welding process method of the pipeline for the ship comprises the steps of forming the pipeline for the ship by a flange, a stainless steel pipe, an elbow, a clamping sleeve seat, a three-way steel pipe, a sealing plate and a blocking plate.
Further, the appearance inspection in step S1 is mainly to perform physical mirror polishing on the inner and outer surfaces of the welding parent metal, and then to remove the welding parent metal with surface defects such as cracks, sand holes, pits, and the like; the size detection is to eliminate welding parent metal with size not meeting the requirement; and the chemical element detection is to detect the chemical elements of the welding parent metal according to the material requirements and eliminate the welding parent metal which does not meet the material requirements.
Furthermore, after the welding bead is welded in the step 2, the welding bead is lower than the welding surface by 1-2 mm so as to avoid the phenomena of undercut and welding deviation caused by the melting of the edge of the groove during the subsequent cover surface welding.
Further, if the cover surface welding cannot be carried out in time in the step 2, the surface of the backing weld is ensured to be free of oil stains, rust and the like during secondary welding, and the specific operation of the cover surface welding is basically the same as that of the backing weld.
Furthermore, in the step 2, the swing amplitude of the welding gun is slightly large during cover surface welding, the molten pool exceeds the edge of the groove by 0.5-1.5 mm, so that the two sides of the groove are well fused, the welding speed is kept uniform as far as possible, and the arc crater is filled during arc extinguishing.
Further, the pressure test in the step 5 is to use 0.6MPa of clean air for 30min, and the pressure is not reduced in the test process; the hydrostatic test is to use 1.0MPa purified water to maintain the pressure for 30min, and the pressure is not reduced and no water drops leak in the test process.
As described above, the welding process method of the ship pipeline emphasizes ensuring the quality of the pipeline in each welding step, effectively solves the problem of welding defects of the ship pipeline, eliminates the hidden danger of water leakage and water seepage of the welded pipeline in the operation process from the source, and better ensures that the equipment works with high efficiency in the design life.
Drawings
FIG. 1 is a flow chart of a welding process for marine pipeline according to the present invention;
FIG. 2 is a schematic diagram of a typical simple marine pipeline;
fig. 3 is a view showing a typical structure of a complicated marine pipeline.
The figures are numbered: 1-flange, 2-stainless steel pipe, 3-elbow, 4-clamping sleeve seat, 5-tee steel pipe, 6-closing plate and 7-blocking plate.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Before describing the embodiments of the present invention in detail, the environment in which the present invention is applied will be described. The technology of the invention is mainly applied to a welding process method of the pipeline for the ship. Experience shows that the water cooling mode is adopted to take away heat generated by electronic components and chips, and meanwhile, hidden troubles of water leakage and water seepage exist. Therefore, a reasonable and effective ship pipeline welding process method is formulated, hidden dangers can be prevented from being generated at the source of pipeline welding, and high-efficiency operation of equipment in the design life period is guaranteed.
As shown in fig. 1, the present invention discloses a welding process method for a marine pipeline, including:
and S1, selecting welding parent metal.
And S2, welding the pipeline.
And S3, detecting the welding seam.
And S4, processing the surface of the pipeline.
S5, pressure test.
Fig. 2 shows a block diagram of a typical simple marine pipeline, consisting of a flange 1, a stainless steel pipe 2 and an elbow 3.
Fig. 3 shows a structure diagram of a typical complex pipeline for a ship, which is composed of a flange 1, a stainless steel pipe 2, an elbow 3, a ferrule holder 4, a three-way steel pipe 5, a sealing plate 6 and a blocking plate 7. The method of the installation process of the marine pipeline will be described in detail with reference to this example.
1, selecting welding parent metal.
The welding parent metal mainly comprises a flange 1, a stainless steel pipe 2, an elbow 3, a clamping sleeve seat 4, a three-way steel pipe 5, a sealing plate 6 and a blocking plate 7, and appearance and size detection is performed on the stainless steel pipe 2, the elbow 3 and the like before welding, and then chemical element detection is performed. The appearance detection mainly comprises the steps of physically polishing the inner surface and the outer surface of a welding base metal by a mirror surface, removing the welding base metal with surface defects such as cracks, sand holes, pits and the like, removing the welding base metal with the size which does not meet the requirements, carrying out chemical element detection on the welding base metal according to the material requirements, and removing the welding base metal which does not meet the material requirements.
2, welding the pipeline: comprises the steps of welding wire selection, backing welding and cover surface welding.
(1) Selecting welding wires: in the process of pipeline welding, welding wires with different diameters are selected for steel pipes with different diameters, welding wires with the diameter of 1.2mm are selected for DN 15-DN 35 stainless steel pipes, and welding wires with the diameter of 2.0mm are selected for DN 40-DN 80 stainless steel pipes.
(2) And backing and welding the pipeline.
Firstly, pretreatment in welding: and (3) drilling a V-shaped groove on the pipe orifice, removing the broken opening of the pipe orifice, removing water rust, oil stain and other dirt within the range of 20mm at the end part, polishing the pipe orifice until the metal luster is leaked, and then cleaning water, dust and the like by using organic solvents such as gasoline, acetone and the like.
Secondly, the pipeline is welded in a positioning mode after being spliced according to the drawing, and 3-4 points of the welding line are welded through argon arc welding to guarantee that the positioning welding is thorough and free of any defects.
And thirdly, the height of a welding seam of backing welding accounts for 50-80% of the total wall thickness by 3mm, and the welding seam is 1-2 mm lower than the welding surface after welding, so that the phenomena of undercut and welding deviation caused by the fusion of the edge of the groove during the subsequent cover surface welding are avoided.
Fourthly, immediately cleaning the oxide layer on the surface of the welding bead by using a steel wire brush after welding.
(3) And (3) welding a pipeline cover surface: after the backing welding is finished, performing cover surface welding, and if the cover surface welding cannot be performed in time, ensuring that the surface of the backing welding has no oil stains, rust and the like during secondary welding; the concrete operation of the cover surface welding is basically the same as that of the back welding; during cover surface welding, the swing amplitude of a welding gun is slightly large, the molten pool exceeds the edge of the groove by 0.5-1.5 mm, so that good fusion of two sides of the groove is ensured, the welding speed is kept uniform as far as possible, and the arc pit is filled when the arc is closed; after welding, the surface of the welding seam is cleaned and observed, the defects of cracks, air holes, undercut and the like cannot exist, and if the defects exist, polishing, repairing and re-welding are needed.
3, detecting a welding seam: performing penetration flaw detection and then performing ray flaw detection on the welded pipeline, wherein the penetration flaw detection can find the defects of cracks, delamination, pores, looseness and the like on the surface of a welding seam according to the corresponding penetration flaw detection standard; the radiographic inspection can obtain a projection image of the weld defects, and the specific requirements for high detection rate of volume type defects (air holes and slag inclusion) and high detection rate of area type defects (cracks and unfused) are met according to the corresponding radiographic inspection standards.
4, pressure test: after the pipeline for the ship is welded, performing strength and sealing tests on the whole pipeline: firstly, keeping the pressure for 30min by using 0.6MPa of clean air, wherein the pressure is not reduced in the test process; then, the pressure is maintained for 30min by using purified water with the pressure of 1.0MPa, and the pressure is not reduced and water drops do not leak in the test process.
In conclusion, the welding process method for the ship pipeline effectively solves the problem of welding defects of the ship pipeline, eliminates the hidden danger of water leakage and water seepage of the welded pipeline during operation from the source, and better ensures that the equipment works at high efficiency within the design life.
Other advantages and effects of the present invention will be apparent to those skilled in the art from the description of the present specification. Various details of the present description may also be modified or changed in various respects, all without departing from the spirit of the present invention, based on different perspectives and applications.
Claims (7)
1. The welding process method of the ship pipeline is used for welding the ship pipeline comprising a flange (1), a stainless steel pipe (2) and an elbow (3), and is characterized in that: comprises the following steps
S1, performing appearance detection and size detection on welding base materials including a flange (1), a stainless steel pipe (2) and an elbow (3), and then performing chemical element detection;
s2, welding the pipeline: welding wires with the diameter of 1.2mm are selected to weld the stainless steel pipes (2) of DN 15-DN 35, and welding wires with the diameter of 2.0mm are selected to weld the stainless steel pipes (2) of DN 40-DN 80; drilling a V-shaped groove at the pipe orifice of the pipeline, removing a break on the pipe orifice, removing dirt within the range of 20mm at the end part of the pipe orifice, polishing the dirt until the metal luster is leaked out, and then cleaning water and dust by using an organic solvent to finish the pre-welding treatment; positioning welding is carried out after the pipelines are spliced, and 3-4 points of welding seam welding are ensured to be completely welded without any defects; manual argon arc welding is adopted to finish backing welding of pipelines, the welding seam with the height of 3mm accounts for 50-80% of the total wall thickness, and a steel wire brush is used for cleaning an oxidation layer on the surface of the welding bead immediately after welding; manual argon arc welding is adopted to finish the cover surface welding of the pipeline; cleaning and observing the surface of the welding seam after welding, and polishing, repairing and re-welding if cracks, air holes and undercut exist;
s3, detecting the welding seam: carrying out penetration flaw detection on the pipeline and then carrying out radiographic flaw detection;
s4, pipeline surface treatment: physically polishing the welded pipeline surface, and carrying out acid pickling passivation;
s5, pressure test: and carrying out air pressure test and then carrying out hydraulic test on the welded pipeline.
2. The welding process method of the marine pipeline according to claim 1, wherein the marine pipeline is composed of a flange (1), a stainless steel pipe (2), an elbow (3), a clamping sleeve seat (4), a three-way steel pipe (5), a sealing plate (6) and a blocking plate (7).
3. The welding process method of marine pipeline according to claim 1 or 2, wherein the appearance inspection in step S1 is performed by physically polishing the inner and outer surfaces of the welding parent metal with mirror surface, and then removing the welding parent metal with cracks, sand holes, and pits; the size detection is to eliminate welding parent metal with size not meeting the requirement; and the chemical element detection is to detect the chemical elements of the welding parent metal according to the material requirements and eliminate the welding parent metal which does not meet the material requirements.
4. The welding process method of the marine pipeline according to claim 1 or 2, wherein the welding bead in the step 2 is 1-2 mm lower than the welding surface after welding so as to prevent the edge of the groove from melting.
5. The process method for welding marine pipelines according to claim 1 or 2, wherein if the cover welding cannot be carried out in time in the step 2, the back welding surface is ensured to be free of oil stains and rust during the re-welding, and the specific operation of the cover welding is basically the same as that of the back welding.
6. The welding process method of the marine pipeline according to claim 1 or 2, wherein in the step 2, the swing amplitude of the welding gun is slightly large during cover surface welding, the molten pool exceeds the edge of the groove by 0.5-1.5 mm, so that good fusion of two sides of the groove is ensured, the welding speed is kept as uniform as possible, and the arc pit is filled during arc extinguishing.
7. The welding process method of marine pipeline according to claim 1 or 2, wherein the pressure test in step 5 is performed by maintaining 0.6MPa of clean air for 30min, and the pressure is not reduced during the test; the hydrostatic test is to use 1.0MPa purified water to maintain the pressure for 30min, and the pressure is not reduced and no water drops leak in the test process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210675552.7A CN115070167A (en) | 2022-06-15 | 2022-06-15 | Welding process method of pipeline for ship |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210675552.7A CN115070167A (en) | 2022-06-15 | 2022-06-15 | Welding process method of pipeline for ship |
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