CN115091005B - Metal powder core welding wire and application thereof and method for welding long-distance pipeline - Google Patents
Metal powder core welding wire and application thereof and method for welding long-distance pipeline Download PDFInfo
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- CN115091005B CN115091005B CN202210873411.6A CN202210873411A CN115091005B CN 115091005 B CN115091005 B CN 115091005B CN 202210873411 A CN202210873411 A CN 202210873411A CN 115091005 B CN115091005 B CN 115091005B
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- 238000003466 welding Methods 0.000 title claims abstract description 208
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 56
- 239000002184 metal Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000000843 powder Substances 0.000 title claims abstract description 30
- 238000005498 polishing Methods 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 5
- 239000010953 base metal Substances 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 8
- 239000001257 hydrogen Substances 0.000 abstract description 8
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 239000007789 gas Substances 0.000 description 10
- 238000002360 preparation method Methods 0.000 description 10
- 238000005253 cladding Methods 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 229910010413 TiO 2 Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
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
- 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 core welding wire and application thereof, and a method for welding long-distance pipelines. 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 content of diffused hydrogen and less harmful impurities, and meanwhile, the influence on the health of welding workers can be reduced due to the reduction of the diffused hydrogen and the harmful substances. 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 can be 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 core welding wire, application thereof and a method for welding long-distance pipelines.
Background
Currently, a mountain large-caliber high-steel-grade long-distance pipeline is 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, the flux-cored wire or the solid welding wire is used for filling, the component of the flux-cored wire has stronger oxidizing property, the diffused hydrogen in the weld metal is not easy to remove, and more nonmetallic inclusions remain in the weld metal. The flux-cored wire also has the problems of uneven tissue performance and relatively low mechanical property during welding. The solid welding wire uses the mixed gas (Ar+CO 2) as the shielding gas, so that the molten pool has deeper penetration but narrower width, and the defect of unfused is easy to generate, and the defect easily causes the reduction of the strength and impact toughness of the welding line.
The current welding method mainly has the following problems: 1. whether the flux-cored wire is an acid gas protection flux-cored wire or an alkaline gas protection flux-cored wire, the flux-cored component in the flux-cored wire mostly contains mineral components such as calcium fluoride, rutile, calcium oxide and the like. The flux-cored wire has stronger component oxidizing property, is not easy to remove the diffusion hydrogen in the weld metal, has more nonmetallic inclusion residues in the weld metal, leads to unstable toughness and lower toughness of the weld, and has larger cracking risk. 2. Because the flux-cored welding wire is used, partial welding seam performance is uneven due to uneven flux-cored components in the production of welding materials, and therefore quality hidden trouble is easy to generate. 3. When welding is performed by using the flux-cored wire, a large amount of smoke dust is generated, and the flux-cored wire has adverse effects 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 capable of improving welding quality and welding seam performance.
In order to achieve the above object, a first aspect of the present invention provides a metal powder-cored welding wire comprising the following components in terms of elements by 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.
A second aspect of the present invention provides the use of a metal powder cored wire as described in the first aspect above in root, filler and cap welding of high grade pipelines.
A third aspect of the invention provides a method of welding long-distance pipelines, the method comprising: in the CO 2 atmosphere, welding at least one part of root welding, filling welding and cover welding of a conveying pipeline by adopting a metal powder core welding wire to obtain the long-distance conveying pipeline;
The long-distance pipeline comprises a conveying pipeline and a welding wire dressing which are welded in series; the welding wire dressing is formed at a welding position after the metal powder core welding wire is welded;
The metal powder-cored welding wire is the metal powder-cored welding wire described in the first aspect.
Compared with the prior art, the invention has at least the following advantages:
(1) The metal powder core welding wire provided by the invention can adjust the viscosity of a welding pool, so that the thrust of an electric arc can push the welding pool away uniformly towards two sides of a groove.
(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 the flux-cored welding wire.
(3) The metal powder-cored welding wire provided by the invention can meet the welding process requirements, and meanwhile, the welding forming quality is very good, and the splashing is far smaller than that of a solid welding wire.
(4) The metal powder-cored welding wire provided by the invention can be suitable for the environment with CO 2 as protective gas, so that the penetration capability and penetration depth of an electric arc can be increased, the welding seam is well formed, and particularly, the welding seam at the overhead welding position is not easy to generate a bulge phenomenon.
(5) The metal powder-cored welding wire provided by the invention has low diffusion hydrogen content and less harmful impurities, can ensure that a weld joint structure has a large amount of acicular ferrite, and further has excellent mechanical properties. The reduction of the diffusion of hydrogen and harmful substances simultaneously can reduce the influence on the health of welding workers.
(6) The method for welding the long-distance pipeline can strengthen the mechanical property of the welding seam of the long-distance pipeline, overcome the defect that the mountain area long-distance pipeline generates larger internal stress due to larger relief and easily brings potential safety hazard, and provide technical guarantee for the safe operation of the pipeline.
(7) The long-distance pipeline obtained by the method for welding the long-distance pipeline can be suitable for mountainous and hilly areas with the gradient of 25-60 degrees.
Drawings
The accompanying drawings are included to provide a further understanding of 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, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 is a schematic illustration of a preferred external pair of mouth pieces provided by the present invention;
FIG. 2 is a schematic illustration of a preferred internal pair of mouth pieces provided by the present invention;
FIG. 3 is a schematic illustration of a preferred weld pairing parameter provided by the present invention;
FIG. 4 is a schematic view of a preferred compound groove provided by the present invention;
FIG. 5 is a comparative view of a weld cross-sectional profile obtained after welding using a prior art welding wire and a preferred welding wire provided by the present invention; in fig. 5, (a) is a welding seam cross-section forming diagram obtained after welding with the welding wire DS1, and (b) in fig. 5 is a welding seam cross-section forming diagram obtained after welding with the welding wire S1 provided by the invention.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
As previously described, a first aspect of the present invention provides a metal cored welding wire comprising the following components 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, and those skilled in the art can select 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 understand the limitation of the present invention.
Preferably, the tensile strength of the welding wire is 600-700Mpa, and is exemplified by 610Mpa, 620Mpa, 630Mpa, 640Mpa, 650Mpa, 660Mpa, 670Mpa, 680Mpa, 690Mpa, 700Mpa; the yield strength of the welding wire is 510-580Mpa, and is exemplified by 510Mpa, 520Mpa, 530Mpa, 540Mpa, 550Mpa, 560Mpa, 570Mpa, 580Mpa.
A second aspect of the present invention provides the use of a metal cored welding wire as described in the first aspect above in root, filler and cap welding of high grade steel pipelines.
The type of the high-grade steel pipeline is not particularly limited in the present invention, and may be a high-grade steel pipeline known in the art, and the high-grade steel pipeline may be a large-caliber high-grade steel long-distance pipeline, for example; the diameter of the large-caliber high-steel-level long transmission pipeline is 813-1422mm, the length is more than 70 km, and the length of a single pipe is 12.7 m.
A third aspect of the invention provides a method of welding long-distance pipelines, the method comprising: in the CO 2 atmosphere, welding at least one part of root welding, filling welding and cover welding of a conveying pipeline by adopting a metal powder core welding wire to obtain the long-distance conveying pipeline;
The long-distance pipeline comprises a conveying pipeline and a welding wire dressing which are welded in series; the welding wire dressing is formed at a welding position after the metal powder core welding wire is welded;
The metal powder-cored welding wire is the metal powder-cored welding wire described in the first aspect.
Preferably, the welding wire 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.
The metal powder cored wire has a certain loss of some elements after welding, so that the content of each element in the welding wire dressing formed after welding is different from the content before welding to some extent.
Preferably, the welding mode is downward welding, and the welding polarity is direct current reverse connection.
According to a preferred embodiment, the method further comprises: before the welding, sequentially carrying out groove processing and pipe orifice group pairing on the long-distance pipeline;
The beveling is such that the beveled blunt edge of the long-distance pipeline is no more than 2.0mm, illustratively 0.5mm, 1.0mm, 1.5mm, 2.0mm, etc.; the gap of the nozzle set pairs 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 welding position angle range 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 residence time and the right residence time are respectively and independently 0.225-0.275s.
It should be noted that, the angle range of the welding position of the pipeline in the invention refers to the included angle between the pipeline and the horizontal plane.
Preferably, the welding parameters of the welding are set in multiple stages. More preferably, the multiple segments are provided in 2-8 segments.
Particularly preferably, the welding parameters of the welding are 2-section settings, and the settings comprise a first-section setting and a second-section setting in sequence; the welding position angle range of the pipeline arranged in 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 residence time and the right residence time are respectively and independently 0.225-0.275s; the welding position angle range of the pipeline arranged in 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 residence time and the right residence time are respectively and independently 0.225-0.275s.
Preferably, the method further comprises: polishing the long-distance pipeline after the welding; the polishing treatment comprises the following steps:
polishing the pipe weld seam to be flush with the base metal, wherein the polishing length is not less than 100mm, and is exemplified by 110mm, 120mm, 130mm and the like; the staggered edges are not more than 10% of the wall thickness of the long-distance pipeline and are distributed at equal intervals along the circumference of the long-distance pipeline, and are exemplified by 5%, 7%, 9% and the like.
Preferably, the welding device in the filler welding and/or the cover welding has an out-of-plane characteristic, and the current, voltage curve drop rate is not more than 5%, and is exemplified by 2%, 3%, 4%, etc.
It should be noted that, the decreasing rate of the current and voltage curve in the present invention refers to the variation amplitude of the ratio of the output voltage of the welding device power supply to the welding current.
Preferably, the length of the welded cable is not more than 25m and the gauge is not less than 50 square millimeters; or the length of the welded cable is more than 30m, and the specification is not less than 75 square millimeters.
Preferably, the long-distance pipeline has a diameter of 800-1500mm, illustratively 800mm, 850mm, 900mm, 1000mm, 1100mm, 1200mm, 1300mm, 1400mm, 1500mm, etc.
The invention will be described in detail below by way of examples.
Preparation example 1: preparation of Metal cored wire S1
2.5Wt% of TiO 2, 1.5wt% of Al 2O3, 3.5wt% of SiO 2 and 92.5wt% of Fe powder are mixed and then filled into a tubular welding wire sheath made of a steel belt (low alloy steel, model X70/L485) as a powder core, wherein the powder core accounts for 10% of the total weight of the metal welding wire, and the metal powder core welding wire S1 is obtained.
The types of steel strips used in the following examples are the same as the proportion of the powder core to the total weight of the metal wire.
Preparation example 2: preparation of Metal powder cored welding wire S2
1.7Wt% of TiO 2, 2wt% of Al 2O3, 2.7wt% of SiO 2, 1.5wt% of MgO and 92.1wt% of Fe powder are mixed and filled into a tubular welding wire sheath made of a steel belt, so as to obtain a metal powder cored welding wire S2.
Comparative preparation 1: preparation of Metal powder cored welding wire DS1
3Wt% of TiO 2, 1wt% of Al 2O3, 1.5wt% of SiO 2, 2.5wt% of MgO and 92wt% of Fe powder are mixed and filled into a tubular welding wire sheath made of a steel belt, so as to obtain a metal powder cored welding wire DS1.
Comparative preparation 2: preparation of Metal powder cored welding wire DS2
4Wt% of TiO 2, 2wt% of Al 2O3 and 4wt% of SiO 2 are mixed with 90wt% of Fe powder and then filled into a tubular welding wire sheath made of a steel belt, so as to obtain the metal powder core welding wire DS2.
The types and contents of the constituent elements in the wire dressing formed correspondingly after the metal cored wire is welded are shown in table 1 (wherein the corresponding formation means that the metal cored wire S1 forms the wire dressing L1, and the metal cored wire S2, the metal cored wire DS1, and the metal cored wire DS2 are pushed in this way).
Example 1
Groove processing: the method comprises the steps of adopting an internal expansion type beveling machine (model DN 800) to carry out beveling on a pipeline with the diameter of 813mm, and processing the pipeline into a composite type bevel as shown in fig. 3 or 4, wherein the blunt edge a of the bevel is 1.5+/-0.5 mm, the included angle alpha between a first slope and the radial direction is 5 degrees, the included angle beta between a second slope and the radial direction is 30 degrees, and the distance l between the joint of the first slope and the second slope and the inner surface of the pipeline is 7mm;
Nozzle group pair: the pipeline subjected to groove processing is assembled by adopting an external butt joint device pair shown in the figure 1, and the assembling clearance b is 2.5+/-0.5 mm;
Welding: using pure CO 2 as shielding gas (the gas flow is 25+/-5L/min), adopting a welding wire S1 with phi of 1.2mm to carry out root welding on the pipeline by adopting a single-welding-torch external welding machine (model PL-500) according to the welding parameters in Table 2, and adopting downward welding (0-3-6 points and 0-9-6 points); filling welding and cover welding (wherein the filling welding and the cover welding are multi-layer and multi-pass welding) are sequentially carried out by adopting an alkaline gas shielded flux-cored wire in the CN110773544A embodiment 1, the length of a welding cable is 10m, and the specification is 50mm 2, so that a long-distance pipeline is obtained.
Example 2
This example was conducted in a similar manner to example 1 except that: the pipe orifice pairing device is different, and the embodiment adopts the pipeline after the groove processing of the internal pairing device pair as shown in fig. 2.
Test case
The welding performance of the metal cored welding wires prepared in the preparation examples and the comparative preparation examples was tested according to the method in example 1, and the test results are shown in table 3.
Table 1: chemical composition of welding wire dressing 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 that: "10%" means 10% of the parameter, e.g., 5.0.+ -. 10% means: 5.0± (5.0×10%); "DC+" means DC reverse.
Continuing with table 2: welding parameters (filler weld, cover weld)
Table 3: performance parameters of metal cored welding wire S1-S2, DS1-DS2
As can be seen from the results in Table 3, the metal powder cored welding wire provided by the invention can improve the compressive strength, the yield strength and the average impact power of a long-distance pipeline, and can also enhance the mechanical properties of welding seams, thereby providing technical support for the safe operation of the pipeline; meanwhile, the cladding efficiency of the metal powder core welding wire provided by the invention is as high as 95%.
In addition, the metal powder-cored welding wire provided by the invention has low content of diffused hydrogen and less harmful impurities, can ensure that a weld joint structure has a large amount of acicular ferrite, further has excellent mechanical properties, and can reduce adverse effects on a welding body due to the reduction of the diffused hydrogen and harmful substances.
The weld cross-section forming diagrams obtained after the welding of the metal powder-cored welding wire S1 and the metal powder-cored welding wire S2 are similar, and the weld cross-section forming diagrams obtained after the welding of the metal powder-cored welding wire S1 are exemplarily provided by the invention. Fig. 5 is a comparative view of the cross-sectional profile of a weld obtained after welding using wire DS1 and a preferred wire S1 according to the present invention. As can be seen by comparing (a) with (b), the welding wire S1 provided by the invention has better performance advantages in the aspects of root welding forming and welding quality; meanwhile, the root welding toughness and strength are better than those of the welding wire DS1.
The welding wire provided by the invention not only can be used for root welding, but also can be used for filling welding and cover 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 melting width is far greater 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 in narrow gap welding, the welding wire can greatly reduce the generation probability of welding unfused defects, 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 wire, and the narrow-gap welding can also save the filling quantity of welding materials, so that the economic cost can be saved.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (8)
1. A method of welding long-distance pipelines, the method comprising: in the CO 2 atmosphere, welding at least one part of root welding, filling welding and cover welding of a conveying pipeline by adopting a metal powder core welding wire to obtain the long-distance conveying pipeline;
The long-distance pipeline comprises a conveying pipeline and a welding wire dressing which are welded in series; the welding wire dressing is formed at a welding position after the metal powder core welding wire is welded;
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 welding wire 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.
2. The method of claim 1, wherein the welding is a downflow welding and the welding polarity is a direct current reversal.
3. The method of claim 1, wherein the welding wire has a tensile strength of 600-700Mpa and a yield strength of 510-580Mpa.
4. The method according to claim 1 or 2, wherein the method further comprises:
before the welding, sequentially carrying out groove processing and pipe orifice group pairing on the long-distance pipeline;
The beveling is carried out so that the blunt edge of the beveling of the long-distance pipeline is not more than 2.0mm; the gap between the pipe orifice group pairs is 2.5-3.5mm.
5. The method of claim 1 or 2, wherein the welding is performed using a single torch automated welding process.
6. The method according to claim 1 or 2, wherein the welding conditions at least satisfy: the welding position angle range 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 residence time and the right residence time are respectively and independently 0.225-0.275s.
7. The method according to claim 1 or 2, wherein the method further comprises:
polishing the long-distance pipeline after the welding; the polishing treatment comprises the following steps:
And polishing the pipe welding seam to be flush with the base metal, wherein the polishing length is not less than 100mm, and the staggered edges are not more than 10% of the wall thickness of the long-distance pipeline and are distributed at equal intervals along the circumference of the long-distance pipeline.
8. The method according to claim 1 or 2, wherein the current, voltage curve drop rate of the device performing the welding in the filler welding and/or the cover welding is not more than 5%.
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