CN108746934A - A kind of natural gas transmission method for welding pipeline - Google Patents
A kind of natural gas transmission method for welding pipeline Download PDFInfo
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- CN108746934A CN108746934A CN201810717977.3A CN201810717977A CN108746934A CN 108746934 A CN108746934 A CN 108746934A CN 201810717977 A CN201810717977 A CN 201810717977A CN 108746934 A CN108746934 A CN 108746934A
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- transmission method
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Classifications
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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
- B23K9/0026—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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The present invention provides a kind of natural gas transmission method for welding pipeline.The welding method includes carrying out retaining wall on slope to pipeline weld；It is polished inner and outer pipes face at tube groove and groove, cleaning treatment, and completes groove group pair；Gas shield is carried out to weld seam front, selects the speed of welding of 6cm/min~8cm/min to carry out root bead to groove using flux-cored wire as packing material using tungsten argon arc soldering method；Molten hole is formed in weld groove root, it is 3mm~5mm to melt bore dia, is then filled weldering, last cosmetic welding；After the completion of cosmetic welding, arc crater is moved into progress blow-out operation on groove face.The welding method welding quality of the present invention is high, need not carry out gas shield to the welding back side, save the dosage of protective gas, reduce weld interval, improve welding efficiency.
Description
Technical field
The present invention relates to pipeline welding technology fields, more particularly, are related to a kind of natural gas transmission pipeline welding side
Method.
Background technology
In natural gas pipeline welding, the quality of welding point is influenced to avoid the back side of pipeline that oxidation occurs,
Argon tungsten-arc welding root bead generally requires the measure for taking back filled argon to be protected.Interior protective device is needed during this,
And the making of interior protective device needs to expend comparable human and material resources, not only complex procedures, waste argon gas, and welding efficiency
Relatively low, labor intensity is big.Meanwhile in engineering site construction, gas back protection device is often by many live high-altitudes
The restriction of the factors such as operation, narrow environment and be difficult to use.Especially when progress pipeline is met and discussed, the basic nothing of back protection device
Method uses, and carries out the root bead welding of pipeline in this case, the deterioration of property of welded joint will certainly be caused, to safety in production
Bring great hidden danger.
Invention content
It is above-mentioned existing in the prior art it is an object of the present invention to solving for the deficiencies in the prior art
One or more problems.For example, one of the objects of the present invention is to provide in a kind of welding process need not to welding the back side into
The welding method of row gas shield.
To achieve the goals above, the present invention provides a kind of natural gas transmission method for welding pipeline, the pipelines
It studies and point includes：By mass percentage, carbon≤0.03%, silicon≤1.0%, manganese≤2.0%, sulphur≤0.030%, phosphorus≤
0.045%, nickel 10.0%~14.0%, chromium 16.0%~18.0%, molybdenum 2.0%~3.0%, the welding method may include
Following steps：Retaining wall on slope is carried out to pipeline weld；It is polished, at cleaning inner and outer pipes face at tube groove and groove
Reason, and complete groove group pair；Gas shield is carried out to weld seam front, using tungsten argon arc soldering method, using flux-cored wire as
Packing material selects the speed of welding of 6cm/min~8cm/min to carry out root bead to groove, wherein the flux-cored wire includes gold
Belong to crust and internal medicine core, the internal medicine core is made of metal and nonmetallic medicinal powder, the flux-cored wire deposited metal chemistry
Ingredient is, by mass percentage, carbon≤0.03%, chromium 17.0%~20%, nickel 11.0%~14.0%, molybdenum 2.0%~
3.0%, manganese 0.5%~2.5%, silicon≤1.2%, niobium≤0.5%, phosphorus≤0.04%, sulphur≤0.03%；In weld groove root
It is formed and melts hole, it is 3mm~5mm to melt bore dia, is then filled weldering, last cosmetic welding；After the completion of cosmetic welding, arc crater is moved to
Blow-out operation is carried out on groove face.
In an exemplary embodiment of the natural gas transmission method for welding pipeline of the present invention, the pipeline can be
The stainless steel composite pipe road being combined by stainless steel and outer layer carbon structural steels, the structural constituent of the stainless steel may include
Carbon 0.021%~0.028%, silicon 0.46%~0.52%, manganese 0.72%~0.76%, sulphur≤0.002%, phosphorus≤0.035%,
Nickel 10.10%~12.2%, chromium 16.11%~17.6%, molybdenum 2.06%~2.4%, the structural constituent of the carbon structural steels
It may include carbon≤0.15%, silicon≤0.33%, manganese≤1.33%, phosphorus≤0.018%, sulphur≤0.005%.
In an exemplary embodiment of the natural gas transmission method for welding pipeline of the present invention, the carbon structural steels
Microscopic metallographic structure can be ferrite and pearlite.
In an exemplary embodiment of the natural gas transmission method for welding pipeline of the present invention, the root of the groove
Gap can be 2.5 millimeters~3.5 millimeters, and groove root radius can be 0.5 millimeter~1 millimeter, and bevel angle can be 55
~65 degree of degree, root face can be 1.0 millimeters~2.0 millimeters.
In an exemplary embodiment of the natural gas transmission method for welding pipeline of the present invention, when the root bead, weldering
Connect electric current can be 80A~100A, weldingvoltage can be 10V~11V, weld heat input can be 0.75KJ/mm~
1.20KJ/mm。
In an exemplary embodiment of the natural gas transmission method for welding pipeline of the present invention, the welding method is also
Include the steps that carrying out flaw detection can be carried out to weld seam using X-ray after the completion of welding blow-out operates.
In an exemplary embodiment of the natural gas transmission method for welding pipeline of the present invention, the groove can be adopted
It is machined to be formed with lathe or groove.
It is described to groove and slope in an exemplary embodiment of the natural gas transmission method for welding pipeline of the present invention
The polishing of inner and outer pipes face, cleaning treatment are polished including the use of stainless steel wire wheel or wire brush at mouthful, and acetone carries out cleaning will
Impurity, greasy dirt and deburred at groove and groove within the scope of 20 millimeters~30 millimeters of inner and outer pipes face is clean.
In an exemplary embodiment of the natural gas transmission method for welding pipeline of the present invention, when pipeline welding process
When middle welding arc blow-out restarting, the welding arc can be away from former blow-out point rear 8mm~12mm reignitions of arc.
In an exemplary embodiment of the natural gas transmission method for welding pipeline of the present invention, the weldering of the filling weldering
It can be 22V~26V to connect voltage, and welding current can be 80A~100A；The weldingvoltage of the cosmetic welding can be 22V~
26V, welding current are 80A~100A
Compared with prior art, the advantageous effect of the method for the present invention includes：Groove and welding parameter reasonable design weld matter
Amount is high, and speed of welding is fast；Protective device in need not being installed inside welded pipe line, reduces welding cost；Butt welding is not needed
It connects the back side and carries out gas shield, save the dosage of protective gas, reduce weld interval, improve welding efficiency.
Specific implementation mode
Hereinafter, a kind of natural gas transmission pipeline according to the present invention will be described in detail in conjunction with exemplary embodiment
Welding method.
Specifically, on the one hand, the method for the present invention is directed to according to the mass fraction, by mass percentage, carbon≤0.03%,
Silicon≤1.0%, manganese≤2.0%, sulphur≤0.030%, phosphorus≤0.045%, nickel 10.0%~14.0%, chromium 16.0%~
18.0%, the natural gas pipeline of molybdenum 2.0%~3.0%.Be particularly suitable for by include 316L austenitic stainless steels and by
Internal coated layer is 316L austenites, outside base is that the compound stainless steel composite pipe gas pipeline become of L360 carbon steels is welded.
It, can be with by design to welding groove and the control to melting the welding parameters such as hole size, speed of welding, conveying wire speed
Ensure welding quality and welding efficiency well.On the other hand, the flux-cored wire used of the invention carries out root bead to pipeline
When, using the medicinal powder inside flux-cored wire, in welding, generation slag protects the inner surface of root bead well, avoids weld seam
The back side is aoxidized, and inner protection device for pipeline welding need not be prepared in welding process, need not carry out gas to the back side of weld seam
Protection, it is only necessary to gas shield be carried out to weld seam front, protective gas usage amount has been saved, saved welding cost.
The present invention provides a kind of natural gas transmission method for welding pipeline, the welding method is primarily adapted for use in by quality
Percentages, carbon≤0.03%, silicon≤1.0%, manganese≤2.0%, sulphur≤0.030%, phosphorus≤0.045%, nickel 10.0%~
14.0%, the natural gas pipeline of chromium 16.0%~18.0%, molybdenum 2.0%~3.0%.The natural gas pipeline is except upper
It states outside ingredient, remaining can be iron and inevitable impurity.Be particularly suitable for by stainless steel and carbon structural steels it is compound and
At stainless steel composite pipe pipeline, the structural constituent of stainless steel may include carbon 0.021%~0.028%, silicon 0.46%~
0.52%, manganese 0.72%~0.76%, sulphur≤0.002%, phosphorus≤0.035%, nickel 10.10%~12.2%, chromium 16.11%~
17.6%, molybdenum 2.06%~2.4%, the structural constituents of outer layer carbon structural steels includes carbon≤0.15%, silicon≤0.33%, and manganese≤
1.33%, phosphorus≤0.018%, sulphur≤0.005%, microscopic metallographic structure is ferrite and pearlite.
In an exemplary embodiment of the natural gas transmission method for welding pipeline of the present invention, the welding method packet
It includes：
Step S01 carries out retaining wall on slope to pipeline weld.
In this example, it hardens since traditional oxyacetylene torch cutting stock mode can cause pipe cutting surface to be formed
Therefore the harm such as layer, carburizing and alloying element scaling loss carry out tubing not by the way of gas flame cuttiug in method of the invention
Blanking and retaining wall on slope, retaining wall on slope mode are processed using lathe or beveling machine.
In this example, for the method for welding pipeline of the present invention, the design of groove seems particularly heavy to the quality of welding
It wants.The groove root gap of the present invention can be designed as 2.5 millimeters~3.5 millimeters, it is preferred that root gap can be 3 millimeters.
Groove root radius can be 0.5 millimeter~1 millimeter, bevel angle can be 60 degree~70 degree, root face can for 1.0 millimeters~
2.0 millimeter.The above root gap can ensure that root can either penetrate, and will not be burnt.Bevel angle can ensure electric arc
It is deep into the root of weld seam, root is made to penetrate, and then obtains preferable appearance of weld and welding quality.The size of root face can
Ensure root through welding, and is not easy to burn.The setting of above-mentioned groove can ensure that root bead welding bead is well molded.
Step S02 polishes to inner and outer pipes face at tube groove and groove, cleaning treatment, and completes groove group pair.
In this example, before welding, in order to avoid generating stomata the defects of needs to use stainless steel steel wheel or steel wire
Brush to being polished, cleaned inside and outside the pipeline at groove face and groove, then cleaned with acetone with remove impurity,
Greasy dirt and burr etc., polishing, cleaning range can be groove and inside and outside 20 millimeters~30 millimeters of surface.
Step S03 carries out gas shield to weld seam front, using tungsten argon arc soldering method, using flux-cored wire as filling out
It fills material and root bead is carried out to groove.
In this example, the flux-cored wire includes metal sheath and internal medicine core, and the metal sheath is stainless steel, institute
It is that metal and nonmetallic medicinal powder form to state internal medicine core.The flux-cored wire deposited metal composition is carbon≤0.03%, chromium
17.0%~20%, nickel 11.0%~14.0%, molybdenum 2.0%~3.0%, manganese 0.5%~2.5%, silicon≤1.2%, niobium≤
0.5%, phosphorus≤0.04%, sulphur≤0.03%.For example, the welding for 316L austenitic stainless steels, the flux-cored wire
Metal sheath can be 316L stainless steels.
More than, the flux-cored wire constituted using mentioned component is as packing material, during the welding process, in flux-cored wire
The medicine core in portion can generate slag and be protected to root bead inner surface, be combined with slag protection using positive gas shield, really
Protect high weldquality.
In this example, hand tungsten argon arc welding method and automatic TIG Welding Machine method may be used.Preferably,
Using hand tungsten argon arc welding.
In this example, the speed of welding of 6cm/min~7cm/min is selected to carry out root bead to groove, it is ensured that medicine core is welded
The Welding Metallurgy reaction process and de- slag process of silk can be carried out fully, it is ensured that appearance of weld is good.Preferably, speed of welding can
6.2cm/min~6.9cm/min is thought, for example, speed of welding can be 6.5cm/min.
In this example, in order to avoid remaining slag inclusion in the welding process, weld defect, flux-cored wire silk filling is caused to answer small
Amount is quickly filled out and is sent, and mobile spacing wants short, and when rapid wire feed should be guaranteed that welding wire fully dissolves.Therefore, weldering of the invention
In termination process, it is that 6.5cm/min~6.8cm/min is welded to select conveying wire speed.Preferably, the speed of welding wire is conveyed
Can be 6.7cm/min.
In this example, welding current when root bead can be 80A~100A, it is preferred that can be 80A~90A.Welding
Voltage can be 10V~11V, and weld heat input can be 0.75~1.20KJ/mm.Using above-mentioned weldingvoltage, electric current and
Weld heat input is welded, it can be ensured that appearance of weld is good.
In this example, the gas of front protecting can be argon gas.Certainly, protective gas of the invention is without being limited thereto.
Step S04 forms molten hole in weld groove root, is then filled weldering, last cosmetic welding.
In this example, in the welding process, it should ensure that molten bath front end can form molten hole, the formation in molten hole is to ensure that the back of the body
Face penetrates molding important factor in order.The diameter in molten hole can be 3 millimeters~5 millimeters.Preferably, the diameter in molten hole can be
3 millimeters~4 millimeters.Be arranged above-mentioned molten bore dia be advantageous in that can ensure molten pool metal penetrate, will not be burnt.For example,
The diameter in molten hole can be 4.2 millimeters.
In this example, before being filled welding, it should which the impurity such as slag and splatter object when by root bead are cleared up
Totally.The weldingvoltage of filling weldering can be 22V~26V, and welding current can be 80A~100A.Preferably, the weldering of Korea Spro is filled
It can be 23V~25.2V to connect voltage, and welding current can be 82.7A~98.2A.
In this example, before carrying out cover welding, it should clean out filled layer face of weld.The welding of cosmetic welding
Voltage can be 22V~26V, and welding current can be with 80A~100A.Preferably, the weldingvoltage of cosmetic welding can be 24V~
26V, welding current can be 90A~99A.For example, the cosmetic welding in the present invention can be operated using welding electrode arc welding.
Step S05, cosmetic welding carry out blow-out operation after the completion.
In this example, at the end of welding, to prevent the contraction of arc crater from cracking, arc crater should be moved on groove face
Carry out blow-out operation.
More than, after the welding arc blow-out of the present invention when restarting, it should recur away from former blow-out point rear 8mm~12mm
Arc, it is preferred that away from former blow-out point rear 10mm reignitions of arc.The good of welding bead can be ensured by above-mentioned striking-distance is arranged being advantageous in that
Good molding.
Step S06 carries out carrying out flaw detection to weld seam.
In this example, after the completion of welding blow-out operation, carrying out flaw detection can be carried out to weld seam using X-ray.
The above exemplary embodiments for a better understanding of the present invention carry out further it with reference to specific example
Explanation.
Utilize the welding method and traditional welding method pair of the present inventionStainless steel composite pipe carry out root bead
The comparison of weld interval and the consumption of materials is as shown in the table：
1 welding efficiency of table and consumption of materials contrast table
As can be seen from Table 1, root bead is carried out to stainless steel using the root bead part of welding method of the present invention, not only saved
The time of inflation in advance and gas shield device installation, the integral solder time shortens nearly 2 times, and greatly reduces weldering
It is connected into this, shield gas flow rate is only the 1/3 of traditional welding.
In conclusion the welding method of the present invention is to groove and welding parameter reasonable design, welding quality is high, speed of welding
Soon；Protective device in need not being installed inside welded pipe line, reduces welding cost；Gas need not be carried out to the welding back side
Protection, saves the dosage of protective gas, reduces weld interval, improve welding efficiency.
Although above by describing the present invention in conjunction with exemplary embodiment, those skilled in the art should be clear
Chu can carry out exemplary embodiment of the present invention each in the case where not departing from spirit and scope defined by claim
Kind modifications and changes.
Claims (10)
1. a kind of natural gas transmission method for welding pipeline, which is characterized in that the pipeline chemical composition includes：By quality percentage
Than meter, carbon≤0.03%, silicon≤1.0%, manganese≤2.0%, sulphur≤0.030%, phosphorus≤0.045%, nickel 10.0%~14.0%,
Chromium 16.0%~18.0%, molybdenum 2.0%~3.0%, the welding method include the following steps：
Retaining wall on slope is carried out to pipeline weld；
It is polished inner and outer pipes face at tube groove and groove, cleaning treatment, and completes groove group pair；
Gas shield is carried out to weld seam front, is selected using flux-cored wire as packing material using tungsten argon arc soldering method
The speed of welding of 6cm/min~8cm/min carries out root bead to groove, wherein the flux-cored wire includes metal sheath and inside
Medicine core, the internal medicine core are made of metal and nonmetallic medicinal powder, and the flux-cored wire deposited metal composition is, by quality
Percentages, carbon≤0.03%, chromium 17.0%~20%, nickel 11.0%~14.0%, molybdenum 2.0%~3.0%, manganese 0.5%~
2.5%, silicon≤1.2%, niobium≤0.5%, phosphorus≤0.04%, sulphur≤0.03%；
Molten hole is formed in weld groove root, it is 3mm~5mm to melt bore dia, is then filled weldering, last cosmetic welding；
After the completion of cosmetic welding, arc crater is moved into progress blow-out operation on groove face.
2. natural gas transmission method for welding pipeline according to claim 1, which is characterized in that the pipeline is by stainless
The stainless steel composite pipe road that steel is combined with outer layer carbon structural steels, the structural constituent of the stainless steel includes carbon 0.021%
~0.028%, silicon 0.46%~0.52%, manganese 0.72%~0.76%, sulphur≤0.002%, phosphorus≤0.035%, nickel 10.10%
~12.2%, chromium 16.11%~17.6%, molybdenum 2.06%~2.4%, the structural constituents of the carbon structural steels include carbon≤
0.15%, silicon≤0.33%, manganese≤1.33%, phosphorus≤0.018%, sulphur≤0.005%.
3. natural gas transmission method for welding pipeline according to claim 2, which is characterized in that the carbon structural steels
Microscopic metallographic structure is ferrite and pearlite.
4. natural gas transmission method for welding pipeline according to claim 1, which is characterized in that between the root of the groove
Gap is 2.5 millimeters~3.5 millimeters, and groove root radius is 0.5 millimeter~1 millimeter, and bevel angle is 55 degree~65 degree, and root face is
1.0 millimeters~2.0 millimeters.
5. natural gas transmission method for welding pipeline according to claim 1, which is characterized in that when the root bead, welding
Electric current is 80A~100A, and weldingvoltage is 10V~11V, and weld heat input is 0.75KJ/mm~1.20KJ/mm.
6. natural gas transmission method for welding pipeline according to claim 1, which is characterized in that the welding method is also wrapped
Include the step of welding blow-out operation carries out carrying out flaw detection using X-ray to weld seam after the completion.
7. natural gas transmission method for welding pipeline according to claim 1, which is characterized in that the groove uses lathe
Or groove machines to be formed.
8. natural gas transmission method for welding pipeline according to claim 1, which is characterized in that described to groove and groove
The polishing of place inner and outer pipes face, cleaning treatment are polished including the use of stainless steel wire wheel or wire brush, and acetone is cleaned slope
Impurity, greasy dirt and deburred at mouth and groove within the scope of 20 millimeters~30 millimeters of inner and outer pipes face is clean.
9. natural gas transmission method for welding pipeline according to claim 1, which is characterized in that when in pipeline welding process
When welding arc blow-out restarting, the welding arc is away from former blow-out point rear 8mm~12mm reignitions of arc.
10. natural gas pipeline welding method according to claim 1, which is characterized in that the welding of the filling weldering
Voltage is 22V~26V, and welding current is 80A~100A；The weldingvoltage of the cosmetic welding is 22V~26V, and welding current is
80A~100A.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109352134A (en) * | 2018-11-27 | 2019-02-19 | 四川石油天然气建设工程有限责任公司 | A kind of acidic environment carbon steel piping welding method |
| CN109707915A (en) * | 2018-12-21 | 2019-05-03 | 南通好的防腐装备有限公司 | A kind of pipeline limit ring and pipeline processing technique |
| CN113351963A (en) * | 2021-06-28 | 2021-09-07 | 中国电建集团山东电力建设第一工程有限公司 | Reverse backing welding method for large-diameter stainless steel fused salt pipeline |
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| CN109352134A (en) * | 2018-11-27 | 2019-02-19 | 四川石油天然气建设工程有限责任公司 | A kind of acidic environment carbon steel piping welding method |
| CN109707915A (en) * | 2018-12-21 | 2019-05-03 | 南通好的防腐装备有限公司 | A kind of pipeline limit ring and pipeline processing technique |
| CN113351963A (en) * | 2021-06-28 | 2021-09-07 | 中国电建集团山东电力建设第一工程有限公司 | Reverse backing welding method for large-diameter stainless steel fused salt pipeline |
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