CN115091005A - Metal powder-cored welding wire, application thereof and method for welding long-distance pipeline - Google Patents
Metal powder-cored welding wire, application thereof and method for welding long-distance pipeline Download PDFInfo
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- CN115091005A CN115091005A CN202210873411.6A CN202210873411A CN115091005A CN 115091005 A CN115091005 A CN 115091005A CN 202210873411 A CN202210873411 A CN 202210873411A CN 115091005 A CN115091005 A CN 115091005A
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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
-
- 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
- B23K35/3033—Ni as the principal constituent
-
- 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)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention relates to the field of pipeline welding, and discloses a metal powder-cored welding wire, application thereof and a method for welding a long-distance pipeline. The metal powder-cored welding wire comprises the following components in percentage by mass: 0.04-0.1% of C, 0.2-0.7% of Si, 1.1-1.4% of Mn, 0.005-0.01% of P, 0.005-0.01% of S, 0.01-0.05% of Cr, 0.01-0.35% of Mo and 1.2-1.9% of Ni. The metal powder-cored welding wire provided by the invention has lower diffusible hydrogen content and less harmful impurities, and the reduction of diffusible hydrogen and harmful substances can reduce the influence on the health of welding workers. When the metal powder-cored welding wire provided by the invention is used for welding, the welding quality can be improved, the strength and toughness of a pipeline welding seam are improved, and a powerful support is provided for the quality and safety of pipeline operation.
Description
Technical Field
The invention relates to the field of pipeline welding, in particular to a metal powder-cored welding wire, application thereof and a method for welding a long-distance pipeline.
Background
At present, a large-caliber high-steel-grade long-distance pipeline in a mountain area is generally welded by adopting single-welding-torch automatic welding or combined automatic welding, and is welded by adopting a manual argon arc welding and single-welding-torch gas-shielded flux-cored wire or metal powder-cored wire and single-welding-torch gas-shielded flux-cored wire process.
In the prior art, flux-cored wires or solid welding wires are used for filling, the components of the flux-cored wires have strong oxidizability, diffusible hydrogen in weld metal is not easy to remove, and more non-metallic inclusions are left in the weld metal. MedicineThe problems of uneven structure performance and relatively low mechanical property exist in the welding process of the core welding wire. The solid welding wire uses mixed gas (Ar + CO) 2 ) As a shielding gas, the weld pool has a deep penetration but a narrow penetration width, and is liable to produce an unfused defect which easily causes a reduction in weld strength and impact toughness.
The current welding method mainly has the following problems: firstly, whether the flux-cored wire is an acid gas shielded flux-cored wire or an alkaline gas shielded flux-cored wire, most of flux-cored components in the flux-cored wire contain mineral components such as calcium fluoride, rutile, calcium oxide and the like. The flux-cored wire has strong component oxidability, is difficult to remove diffusible hydrogen in weld metal, and has more non-metallic inclusion residues in the weld metal, so that the toughness of the weld is unstable, the toughness is low, and the risk of cracking is high. Secondly, due to the use of the flux-cored wire, the flux-cored wire has the defects that the flux-cored components are not uniform during the production of welding materials, so that the performance of partial welding seams is not uniform, and the quality hidden danger is easy to generate. Thirdly, a great deal of smoke is generated when the flux-cored wire is used for welding, and the smoke has adverse effect on the body of a welder.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a welding wire and a welding method which can improve the welding quality and the welding seam performance.
In order to achieve the above object, a first aspect of the present invention provides a metal-cored welding wire comprising the following components, by mass percentage, on an elemental basis:
0.04-0.1% of C, 0.2-0.7% of Si, 1.1-1.4% of Mn, 0.005-0.01% of P, 0.005-0.01% of S, 0.01-0.05% of Cr, 0.01-0.35% of Mo and 1.2-1.9% of Ni.
A second aspect of the invention provides the use of the metal cored welding wire of the first aspect described above in root welding, fill welding and cap welding of high grade steel pipelines.
A third aspect of the invention provides a method of welding a long length pipe, the method comprising: in CO 2 In the atmosphere, adopting metal powder-cored welding wire to weld at least one position of root welding, filling welding and cover surface welding of the conveying pipeline to obtainTo the long transport pipe;
the long conveying pipeline comprises a conveying pipeline and a welding wire melting and dressing agent which are welded in series; the welding wire molten coating is formed at the welding position after the metal powder-cored welding wire is welded;
the metal cored wire is the metal cored wire described in the first aspect.
Compared with the prior art, the invention has at least the following advantages:
(1) the metal powder-cored welding wire provided by the invention can adjust the viscosity of a welding molten pool, so that the molten pool can be uniformly pushed away towards two sides of a groove by the thrust of an electric arc.
(2) The cladding efficiency of the metal powder-cored welding wire provided by the invention can reach 95%, which is greatly higher than that of a flux-cored welding wire.
(3) The metal powder-cored welding wire provided by the invention can meet the requirements of a welding process, and meanwhile, the welding forming quality is very good, and the splashing is far less than that of a solid welding wire.
(4) The metal powder-cored welding wire provided by the invention can adapt to CO 2 The arc welding device is used as an environment for protecting gas, so that the penetration capacity and the penetration depth of an electric arc can be increased, a welding seam is well formed, and particularly, the welding seam at the overhead welding position is not easy to bulge.
(5) The metal powder-cored welding wire provided by the invention has lower diffusible hydrogen content and less harmful impurities, can ensure that a welding seam structure has a large amount of acicular ferrite, and further has excellent mechanical properties. While the reduction of diffused hydrogen and harmful substances can reduce the impact on the health of the welder.
(6) The method for welding the long-distance pipeline can enhance the mechanical property of the welding seam of the long-distance pipeline, overcome the defect of potential safety hazard caused by large internal stress generated by large relief of the mountain long-distance pipeline, and provide technical support for the safe operation of the pipeline.
(7) The long-distance pipeline obtained by the method for welding the long-distance pipeline provided by the invention can be suitable for mountainous and hilly lands with the gradient of 25-60 degrees.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic view of a preferred external aligner set-up provided by the present invention;
FIG. 2 is a schematic view of a preferred internal aligner set-up provided by the present invention;
FIG. 3 is a schematic representation of a preferred weld set pair parameter provided by the present invention;
FIG. 4 is a schematic view of a preferred compound bevel provided by the present invention;
FIG. 5 is a cross-sectional profile comparison of a weld formed using a prior art welding wire and a preferred welding wire of the present invention; fig. 5 (a) is a cross-sectional profile of a weld seam obtained after welding with welding wire DS1, and fig. 5 (b) is a cross-sectional profile of a weld seam obtained after welding with welding wire S1 according to an embodiment of the present invention.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and these ranges or values should be understood to encompass values close to these ranges or values. For numerical ranges, each range between its endpoints and individual point values, and each individual point value can be combined with each other to give one or more new numerical ranges, and such numerical ranges should be construed as specifically disclosed herein.
As previously mentioned, a first aspect of the present invention provides a metal-cored welding wire comprising the following components, in terms of elements, in mass percent:
0.04-0.1% of C, 0.2-0.7% of Si, 1.1-1.4% of Mn, 0.005-0.01% of P, 0.005-0.01% of S, 0.01-0.05% of Cr, 0.01-0.35% of Mo and 1.2-1.9% of Ni.
It should be noted that the method for preparing the metal cored welding wire is not particularly limited by the present invention, and those skilled in the art can select the method according to the technical means known in the art, and the following description of the present invention exemplarily provides a preferred embodiment, and those skilled in the art should not be construed as limiting the present invention.
Preferably, the tensile strength of the welding wire is 600-700Mpa, illustratively 610Mpa, 620Mpa, 630Mpa, 640Mpa, 650Mpa, 660Mpa, 670Mpa, 680Mpa, 690Mpa, 700 Mpa; the yield strength of the wire is 510-580Mpa, illustratively 510Mpa, 520Mpa, 530Mpa, 540Mpa, 550Mpa, 560Mpa, 570Mpa, 580 Mpa.
A second aspect of the invention provides a use of the metal cored welding wire of the first aspect in root, fill and cap welding of high grade steel pipelines.
It should be noted that, in the present invention, there is no particular limitation on the type of the high steel grade pipeline, and the high steel grade pipeline may be a high steel grade pipeline known in the art, and for example, the high steel grade pipeline may be a large-caliber high steel grade long-distance pipeline; the diameter of the large-caliber high-steel-grade long transmission pipeline is 813-1422mm, the length is more than X70, the length is more than 20km, and the length of a single pipe is 12.7 meters.
A third aspect of the invention provides a method of welding a long length pipe, the method comprising: in CO 2 In the atmosphere, welding at least one of root welding, filling welding and cover surface welding of the conveying pipeline by adopting a metal powder-cored welding wire to obtain the long conveying pipeline;
the long conveying pipeline comprises a conveying pipeline and a welding wire melting and coating material which are welded in series; the welding wire molten coating is formed at the welding position after the metal powder-cored welding wire is welded;
the metal cored wire is the metal cored wire described in the first aspect.
Preferably, the welding wire melting dressing comprises the following components in percentage by mass:
0.049-0.061% of C, 0.09-0.12% of Si, 0.89-1.04% of Mn, 0.009-0.01% of P, 0.002-0.005% of S, 0.01-0.05% of Cr, 0.001-0.11% of Mo and 0.44-1.88% of Ni.
Since some elements in the metal powder cored welding wire are lost after welding, the content of each element in the welding wire flux material formed after welding is different from the content before welding.
Preferably, the welding mode is downward welding, and the welding polarity is direct current reversal.
According to a preferred embodiment, the method further comprises: before the welding, the long-distance pipeline is subjected to groove processing and pipe orifice assembly in sequence;
the beveling is such that the blunt edge of the bevel of the long transport pipe is no greater than 2.0mm, illustratively 0.5mm, 1.0mm, 1.5mm, 2.0mm, etc.; the gap of the nozzle pair is 2.5-3.5mm, illustratively 2.5mm, 3.0mm, 3.5mm, etc.
According to another preferred embodiment, the welding is performed using a single torch automated welding process.
According to a particularly preferred embodiment, the welding conditions at least satisfy: the angle range of the welding position of the pipeline is 0-90 degrees, the wire feeding speed is 200-320inch/min, the walking speed is 15-30cm/min, the swinging speed is 1.35-1.98mm/min, the swinging amplitude is 4.5-6.05mm, and the left staying time and the right staying time are respectively and independently 0.225-0.275 s.
It should be noted that the angle range of the welding position of the pipeline in the present invention refers to the included angle between the pipeline and the horizontal plane.
Preferably, the welding parameters of the welding are multi-segment settings. More preferably, the plurality of segments are arranged in 2-8 segments.
Particularly preferably, the welding parameters of the welding are 2-segment setting, and the welding parameters sequentially comprise a first segment setting and a second segment setting; the angle range of the welding position of the pipeline arranged at the first section is 0-40 degrees, the wire feeding speed is 200-300inch/min, the walking speed is 15-25cm/min, the swinging speed is 1.44-1.76mm/min, the swinging amplitude is 4.95-6.05mm, and the left retention time and the right retention time are respectively and independently 0.225-0.275 s; the angle range of the welding position of the pipeline arranged at the second section is 40-90 degrees, the wire feeding speed is 220-320inch/min, the walking speed is 20-30cm/min, the swinging speed is 1.35-1.65mm/min, the swinging amplitude is 4.5-5.5mm, and the left staying time and the right staying time are respectively and independently 0.225-0.275 s.
Preferably, the method further comprises: after the welding is carried out, polishing the long-distance pipeline; the polishing treatment comprises the following steps:
polishing the pipe-making welding seam to be level with the base material, wherein the polishing length is not less than 100mm, and is exemplarily 110mm, 120mm, 130mm and the like; the group stagger is no more than 10% of the wall thickness of the long conveying pipeline and is distributed at equal intervals along the circumference of the long conveying pipeline, and is exemplarily 5%, 7%, 9% and the like.
Preferably, the equipment in which the welding is performed in the fill welding and/or the cap welding has an out-of-plane characteristic with a current, voltage curve reduction rate of no more than 5%, illustratively 2%, 3%, 4%, etc.
In the present invention, the rate of decrease of the current/voltage curve refers to the amplitude of change in the ratio of the output voltage of the welding equipment power supply to the welding current.
Preferably, the length of the soldered cable is no more than 25m and the gauge is no less than 50 square millimeters; or the length of the soldered cable is greater than 30m and the gauge is not less than 75 square millimeters.
Preferably, the long transport conduit has a diameter of 800-.
The present invention will be described in detail below by way of examples.
Preparation example 1: preparation of Metal cored welding wire S1
2.5 wt% of TiO 2 1.5 wt% of Al 2 O 3 3.5% by weight of SiO 2 Mixing with 92.5 wt% of Fe powder, and filling the mixture as a powder core into a sheath of a tubular welding wire made of a steel strip (low alloy steel, model X70/L485), wherein the powder core accounts for 10% of the total weight of the metal welding wire, and obtaining the metal powder-cored welding wire S1.
The steel strip used in the following examples is of the same type as the powder core in the total weight of the metal welding wire.
Preparation example 2: preparation of Metal cored welding wire S2
1.7 wt% of TiO 2 2 wt% of Al 2 O 3 2.7% by weight of SiO 2 And mixing 1.5 wt% of MgO and 92.1 wt% of Fe powder and filling the mixture into a tubular welding wire sheath made of a steel strip to obtain the metal powder-cored welding wire S2.
Comparative preparation example 1: preparation of Metal powder cored welding wire DS1
3 wt% of TiO 2 1 wt% of Al 2 O 3 1.5 wt% of SiO 2 And 2.5 wt% of MgO and 92 wt% of Fe powder are mixed and filled into the outer skin of the tubular welding wire made of a steel strip, so that the metal powder-cored welding wire DS1 is obtained.
Comparative preparation example 2: preparation of Metal powder cored welding wire DS2
4 wt% of TiO 2 2 wt% of Al 2 O 3 4% by weight of SiO 2 And mixing the powder with 90 wt% of Fe powder and filling the mixture into the outer skin of a tubular welding wire made of a steel strip to obtain the metal powder-cored welding wire DS 2.
The types and contents of the components of the welding wire flux-cored wire dressing correspondingly formed after the metal powder-cored welding wire is welded are shown in table 1 (wherein correspondingly formed means that the metal powder-cored welding wire S1 forms a welding wire flux-cored wire dressing L1, the metal powder-cored welding wire S2, the metal powder-cored welding wire DS1 and the metal powder-cored welding wire DS2 are analogized).
Example 1
Groove machining: an internal expanding beveling machine (model number DN800) is adopted to bevel a pipeline with the diameter of 813mm, and the pipeline can be machined into a composite bevel as shown in figure 3 or figure 4, wherein the blunt edge a of the bevel is 1.5 +/-0.5 mm, the included angle alpha between a first slope surface and the radial direction is 5 degrees, the included angle beta between a second slope surface and the radial direction is 30 degrees, and the distance l between the joint of the first slope surface and the second slope surface and the inner surface of the pipeline is 7 mm;
pipe orifice pairing: the pipeline subjected to groove processing is paired by adopting an external aligning device shown in figure 1, and the pairing gap b is 2.5 +/-0.5 mm;
welding: using pure CO 2 As a shielding gas (gas flow rate 25. + -. 5L/min), a welding wire S1 having a diameter of 1.2mm was used as shown in the table2, performing root welding on the pipeline by adopting a downward welding (0-3-6 points and 0-9-6 points) by adopting a single-torch external welding machine (model PL-500) according to the welding parameters; filling welding and cover surface welding (wherein, the filling welding and the cover surface welding are both multilayer and multi-pass welding) are sequentially carried out by adopting the alkaline gas shielded flux-cored wire in CN110773544A embodiment 1, the length of a welding cable is 10m, and the specification is 50mm 2 And obtaining the long-distance pipeline.
Example 2
This example was carried out in a similar manner to example 1, except that: the pipe orifice assembling device is different, and the pipe orifice assembling device adopts an inner aligning device as shown in fig. 2 to assemble the pipe subjected to groove processing.
Test example
The metal powder-cored wires prepared in the preparation examples and comparative preparation examples were subjected to a welding performance test in the same manner as in example 1, and the test results are shown in table 3.
Table 1: the welding wire molten dressing comprises the chemical components of L1-L2 and DL1-DL2
| Unit/wt% | C | Si | Mn | P | S | Cr | Mo | Ni | Cu | V |
| Cladding material L1 | 0.049 | 0.12 | 0.89 | 0.009 | 0.005 | 0.01 | 0.11 | 0.44 | 0.01 | / |
| Cladding material L2 | 0.061 | 0.09 | 1.04 | 0.009 | 0.002 | 0.01 | 0.001 | 1.88 | 0.01 | / |
| Cladding material DL1 | 0.069 | 0.19 | 1.07 | 0.006 | 0.003 | 0.02 | 0.03 | 0.47 | 0.01 | / |
| Cladding material DL2 | 0.021 | 0.18 | 1.07 | 0.007 | 0.003 | 0.02 | 0.01 | 1.72 | 0.01 | 0.02 |
Table 2: welding parameters (root welding)
Note: "10%" means 10% of the parameters, for example 5.0 ± 10% means: 5.0 + - (5.0 × 10%); "DC +" means DC reverse.
TABLE 2 below: welding parameters (filling welding, cover welding)
Table 3: performance parameters of metal powder core welding wires S1-S2 and DS1-DS2
The results in table 3 show that the metal powder-cored welding wire provided by the invention can improve the compressive strength, the yield strength and the average impact energy of a long-distance pipeline, and can also enhance the mechanical properties of a welding line, thereby providing technical support for the safe operation of the pipeline; meanwhile, the cladding efficiency of the metal powder-cored welding wire provided by the invention is as high as 95%.
In addition, the metal powder-cored welding wire provided by the invention has lower diffusible hydrogen content and less harmful impurities, can ensure that a welding seam structure has a large amount of acicular ferrite, further has excellent mechanical properties, and can reduce adverse effects on the body of a welder due to the reduction of diffusible hydrogen and harmful substances.
The cross-section forming diagrams of the welding seam obtained after the metal powder-cored welding wire S1 and the metal powder-cored welding wire S2 are welded are similar, and exemplarily, the cross-section forming diagram of the welding seam obtained after the metal powder-cored welding wire S1 is welded is provided. FIG. 5 is a cross-sectional profile comparison of a weld formed using welding wire DS1 and a preferred welding wire S1 of the present invention. By comparing the (a) and the (b), the welding wire S1 provided by the invention has better performance advantages in root welding forming and welding seam quality; meanwhile, the toughness and the strength of root welding are both superior to those of welding wire DS 1.
The welding wire provided by the invention can be used for root welding, filling welding and cover surface welding. The welding wire provided by the invention has the advantages that the arc penetration is close to that of a solid welding wire during welding, and the fusion width is far larger than that of the solid welding wire. Therefore, the welding wire provided by the invention is suitable for narrow gap welding, and compared with a solid welding wire, the welding wire can greatly reduce the probability of the generation of the welding unfused defect during the narrow gap welding, and has more excellent nondestructive testing qualification rate; the cladding efficiency of the welding wire provided by the invention is close to that of a solid welding wire and is far higher than that of a flux-cored welding wire, and the filling amount of welding materials can be saved while narrow-gap welding is carried out, so that the economic cost can be saved.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A metal cored welding wire is characterized by comprising the following components in percentage by mass:
0.04-0.1% of C, 0.2-0.7% of Si, 1.1-1.4% of Mn, 0.005-0.01% of P, 0.005-0.01% of S, 0.01-0.05% of Cr, 0.01-0.35% of Mo and 1.2-1.9% of Ni.
2. The metal powder-cored welding wire as claimed in claim 1, wherein the tensile strength of the welding wire is 600-700Mpa, and the yield strength of the welding wire is 510-580 Mpa.
3. Use of the metal cored welding wire of claim 1 or 2 for root welding, filler welding and face welding of high grade steel pipelines.
4. A method of welding long length pipe, the method comprising: in CO 2 In the atmosphere, welding at least one of root welding, filling welding and cover surface welding of the conveying pipeline by adopting a metal powder-cored welding wire to obtain the long conveying pipeline;
the long conveying pipeline comprises a conveying pipeline and a welding wire melting and coating material which are welded in series; the welding wire molten coating is formed at the welding position after the metal powder-cored welding wire is welded;
the metal cored welding wire is the metal cored welding wire according to claim 1 or 2.
5. The method of claim 4, wherein the welding wire flux coating comprises the following components, in terms of mass percent, on an elemental basis:
0.049-0.061% of C, 0.09-0.12% of Si, 0.89-1.04% of Mn, 0.009-0.01% of P, 0.002-0.005% of S, 0.01-0.05% of Cr, 0.001-0.11% of Mo and 0.44-1.88% of Ni; and/or the presence of a gas in the gas,
the welding mode is downward welding, and the welding polarity is direct current reversal.
6. The method of claim 4 or 5, wherein the method further comprises:
before the welding, the long-distance pipeline is subjected to groove processing and pipe orifice assembly in sequence;
the beveling process ensures that the truncated edge of the bevel of the long-distance pipeline is not more than 2.0 mm; the clearance between the pipe orifice assembly is 2.5-3.5 mm.
7. The method of claim 4 or 5, wherein the welding is performed using a single torch automated welding process.
8. The method according to claim 4 or 5, wherein the welding conditions at least satisfy: the angle range of the welding position of the pipeline is 0-90 degrees, the wire feeding speed is 200-320inch/min, the walking speed is 15-30cm/min, the swinging speed is 1.35-1.98mm/min, the swinging amplitude is 4.5-6.05mm, and the left staying time and the right staying time are respectively and independently 0.225-0.275 s.
9. The method of claim 4 or 5, wherein the method further comprises:
after the welding is carried out, polishing the long-distance pipeline; the polishing treatment comprises the following steps:
and polishing the pipe-making welding line to be flush with the base metal, wherein the polishing length is not less than 100mm, the group misalignment is not more than 10% of the wall thickness of the long-distance pipeline, and the group misalignment is distributed at equal intervals along the circumference of the long-distance pipeline.
10. A method according to claim 4 or 5, wherein the current, voltage curve drop rate of the apparatus performing the weld in the fill weld and/or the cap weld is no more than 5%.
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