CN114951903A - Automatic girth welding process for bimetal metallurgical composite pipe - Google Patents
Automatic girth welding process for bimetal metallurgical composite pipe Download PDFInfo
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- CN114951903A CN114951903A CN202210708768.9A CN202210708768A CN114951903A CN 114951903 A CN114951903 A CN 114951903A CN 202210708768 A CN202210708768 A CN 202210708768A CN 114951903 A CN114951903 A CN 114951903A
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- 238000003466 welding Methods 0.000 title claims abstract description 240
- 239000002131 composite material Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005272 metallurgy Methods 0.000 claims abstract description 24
- 230000007797 corrosion Effects 0.000 claims abstract description 15
- 238000005260 corrosion Methods 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 4
- 239000000956 alloy Substances 0.000 claims abstract description 4
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 4
- 239000010959 steel Substances 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 28
- 239000007789 gas Substances 0.000 claims description 23
- 229910052786 argon Inorganic materials 0.000 claims description 20
- 239000010410 layer Substances 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 8
- 239000011229 interlayer Substances 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 238000005253 cladding Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000010953 base metal Substances 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
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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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
-
- 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
- B23K35/304—Ni as the principal constituent with Cr as the next major 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
- B23K9/16—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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- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses an automatic girth welding process for a bimetal metallurgy composite pipe, which comprises the following steps of: s1: the method comprises the following steps of selecting a bimetal metallurgy composite pipe, wherein a base layer pipe of the bimetal metallurgy composite pipe is an X60 steel pipe, and the chemical composition is C: 0.03 to 0.05, Si: 0.25 to 0.35, Mn: 1.40-1.60, P: less than or equal to 0.008S: less than or equal to 0.005, Cr: less than or equal to 0.30, and the balance of Fe; the coating is Incoloy825 corrosion-resistant alloy, and the chemical components are C: less than or equal to 0.05, Si: less than or equal to 0.50, Mn: 1.0 or less, P: 0.005 or less, S: 0.003 or less, Ni: 38.0-45.0, Cr: 20.0-23.0, Mo: 2.5-3.5, Cu: 1.8-3.0, Ti: 0.6-1.2, Al: less than or equal to 0.15, and the balance of Fe. The invention solves the problem of the requirement of automatic girth welding of the bimetal metallurgy composite pipeline. Not only greatly reduces the production cost and the labor intensity of workers, but also effectively improves the welding efficiency and the welding quality of the bimetal metallurgy composite pipeline. The welding joint has excellent comprehensive mechanical property and corrosion resistance.
Description
Technical Field
The invention relates to the technical field of long-distance pipeline welding, in particular to an automatic girth welding process for a bimetal metallurgy composite pipe.
Background
The bimetal composite pipe is made up by using two or more different metal materials through a certain technological process, and is generally formed from base pipe, lining steel pipe or coating metal. The composite pipe can realize the advantage complementation of materials to the maximum extent, reduce the engineering construction cost, improve the corrosion resistance and the wear resistance of the pipeline and prolong the service life of the pipeline on the basis of ensuring various performances of the original base pipe, and is a substitute product of a pure stainless steel pipe or a corrosion-resistant alloy pipe. The bimetal composite pipe is currently applied in the fields of petroleum, chemical industry, nuclear industry, medicine and the like with strong corrosivity.
The circumferential weld welding of the bimetal composite pipe is an important link of the construction of the corrosion-resistant pipeline engineering. If the welding process is not properly selected, the inner and outer layer metals of the circumferential weld are simultaneously contacted with corrosive fluid, more serious electrochemical corrosion can occur, and thus pipeline corrosion, leakage, perforation and the like are caused. At present, when a bimetal composite pipe is connected, the welding of the composite pipe is realized efficiently, the integrity and the good corrosion resistance of a corrosion-resistant layer at a welding joint are ensured, and the requirement on a circumferential weld welding process is high.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an automatic girth welding process for a bimetal metallurgy composite pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic girth welding process for a bimetal metallurgical composite pipe comprises the following steps:
s1: the method comprises the following steps of selecting a bimetal metallurgy composite pipe, wherein a base layer pipe of the bimetal metallurgy composite pipe is an X60 steel pipe, and the chemical composition is C: 0.03 to 0.05, Si: 0.25 to 0.35, Mn: 1.40-1.60, P: less than or equal to 0.008S: less than or equal to 0.005, Cr: less than or equal to 0.30, and the balance of Fe; the coating is Incoloy825 corrosion-resistant alloy, and the chemical components are C: less than or equal to 0.05, Si: less than or equal to 0.50, Mn: 1.0 or less, P: less than or equal to 0.005, S: 0.003 or less, Ni: 38.0-45.0, Cr: 20.0-23.0, Mo: 2.5-3.5, Cu: 1.8-3.0, Ti: 0.6-1.2, Al: less than or equal to 0.15, and the balance of Fe;
s2: machining a groove, namely machining a U-shaped groove at the pipe end of the bimetal metallurgy composite pipe, wherein the angle of the groove is 20-40 degrees, the truncated edge is 1.5-1.8 mm, the upper platform of the truncated edge is 4.0-6.0 mm, and the radius of a transition arc is 2.5-3.5 mm;
s3: the welding material selection, root welding, hot welding, filling welding and cover surface welding all adopt solid welding wires with the diameter of 1.0mm and the model AWS 5.14ERNiCrMo-3, the tensile strength is 700-790 Mpa, the elongation after fracture is 43-48 percent, the impact energy at minus 196 ℃ is 145-165J, and the chemical components by weight percentage are C: 0.01 to 0.02, Si: less than or equal to 0.50, Mn: less than or equal to 0.5, P: 0.005 or less, S: 0.003 or less, Ni: not less than 58.0, Cr: 20.0 to 23.0, Mo: 8.0-10.0, Ti + Nb: 3.2-4.0, and the balance of Fe;
s4: setting welding parameters of root welding, wherein the root welding adopts a hot wire argon tungsten-arc automatic welding process, the shielding gas is argon, the gas flow is 5-10L/min, the welding current is 120-140A, the welding voltage is 9.0-10.0V, the wire feeding speed is 1.8-2.2 m/min, and the welding polarity of the root welding is direct current positive connection;
s5: setting welding parameters of hot welding, filling and cover surface welding, wherein the hot welding, the filling and the cover surface welding adopt a consumable electrode inert gas protection solid welding wire automatic welding process, the gas flow is 10-15L/min, the hot welding current is 140-180A, the welding voltage is 9.0-10.0V, and the wire feeding speed is 2.0-3.0 m/min; the welding current of filling and cover surface welding is 150-210A, the welding voltage is 10-18V, the wire feeding speed is 3.0-7.0 m/min, the welding polarities of hot welding, filling and cover surface welding are direct current positive welding, and the extension length of a welding wire is 8-15 mm;
s6: welding, before welding, firstly assembling the bimetal metallurgy composite pipes, keeping the gap between the openings at 0mm, preheating the positions of grooves, keeping the preheating temperature at 30-50 ℃, keeping the temperature for 3-5 min, mainly removing water vapor and surface rust, then carrying out root welding, before the root welding, filling argon for protection, wherein the gas flow is 5-8L/min, the root welding seam ensures the formation of a single-side welding double-side, carrying out hot welding, filling and cover surface welding in sequence, controlling the interlayer temperature to be less than 100 ℃, adopting a multi-layer and multi-channel welding process during the filling and cover surface welding, and adopting an automatic upward welding mode (welding 12-point position from 6-point position) for the root welding, the hot welding, the filling and the cover surface welding.
Furthermore, the balance of Fe in the S1 is Fe.
Preferably, the shielding gas in S5 is (70% Ar + 30% He) to (90% Ar + 10% He).
As a further scheme of the invention, the diameter of the bimetal metallurgy composite pipe is 508-813 mm, the wall thickness of the base layer pipe is 20-30mm, the wall thickness of the cladding layer is 2-3mm, during welding, 1 welding is carried out, 1-2 welding is carried out, 7-9 welding is carried out in a filling mode, and 1-2 welding is carried out on the cover surface.
Furthermore, in the step S4, argon is filled into the composite tube for protection before root welding, the gas flow is 5-8L/min, the root welding seam ensures the formation of one-side welding and two-side welding, the hot welding, filling and cover welding are carried out in sequence, and the interlayer temperature is controlled to be less than 100 ℃.
The invention has the beneficial effects that:
1. the invention solves the problem of the requirement of automatic girth welding of the bimetal metallurgy composite pipeline. Not only greatly reduces the production cost and the labor intensity of workers, but also effectively improves the welding efficiency and the welding quality of the bimetal metallurgy composite pipeline. The welding joint has excellent comprehensive mechanical property and corrosion resistance.
Drawings
FIG. 1 is a schematic view of a welding groove form of an automatic girth welding process for a bimetal metallurgical composite pipe;
FIG. 2 is a schematic view of a welding layer of an automatic girth welding process for a bimetal metallurgical composite pipe;
FIG. 3 is a flow chart of an automatic girth welding process for a bimetal metallurgical composite pipe.
1. Beveling; 2. transition fillets; 3. a blunt upper platform; 4. a blunt edge; 5. a facing weld bead; 6. filling a weld bead; 7. hot welding a channel; 8. root pass.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
Referring to fig. 1-3, an automatic girth welding process for a bimetal metallurgical composite pipe comprises the following steps:
s1, selecting a bimetal metallurgy composite pipe with the pipe diameter of 508mm, the wall thickness of a base layer pipe of 20mm and the wall thickness of a coating layer of 2mm, wherein the chemical components of the base layer pipe are as follows: 0.05, Si: 0.25, Mn: 1.50, P: 0.008, S: 0.004, Cr: 0.20, and the balance of Fe; the chemical components of the coating are C: 0.03, Si: 0.45, Mn: 0.9, P: 0.005, S: 0.003, Ni: 41.0, Cr: 21.5, Mo: 3.0, Cu: 2.1, Ti: 0.8, Al: 0.1 and the balance of Fe.
And S2, machining a U-shaped groove at the end of the composite pipe, wherein the groove angle is 20 degrees, the truncated edge is 1.8mm, the upper platform of the truncated edge is 5.0mm, and the radius of the transition arc is 2.8 mm.
S3, selecting a solid welding wire with the diameter of 1.0mm and the model AWS 5.14ERNiCrMo-3, wherein the tensile strength of the welding wire is 720Mpa, the elongation after fracture is 45 percent, the impact energy at minus 196 ℃ is 145J, and the weight percentage of chemical components is C: 0.02, Si: 0.50, Mn: 0.40, P: 0.005, S: 0.003, Ni: 61.0, Cr: 22.0, Mo: 9.0, Ti + Nb: 3.5, and the balance of Fe.
S4, wherein root welding is a hot wire argon tungsten-arc automatic welding process, the shielding gas is argon, the gas flow is 8L/min, the welding current is 120-130A, the welding voltage is 9.5V, the wire feeding speed is 1.8-1.9 m/min, hot welding, filling and cover surface welding are consumable electrode inert gas shielded solid wire automatic welding processes, the shielding gas is 80% Ar + 20% He, the gas flow is 12L/min, the hot welding current is 140-150A, the welding voltage is 9.5V, the wire feeding speed is 2.0m/min, and the extending length of the welding wire is 10 mm; the welding current of the filling and cover surface welding is 150-170A, the welding voltage is 10-15V, the wire feeding speed is 6.0m/min, the extending length of a welding wire is 12mm, and the welding polarities of the hot welding, the filling and the cover surface welding are direct current positive welding.
And S5, before welding, firstly assembling the bimetal metallurgy composite pipes, preheating the groove position with the gap of 0mm, keeping the preheating temperature at 30 ℃ for 3min, and removing water vapor and surface rust on the groove surface.
And S6, filling argon gas for protection in the composite tube, wherein the gas flow is 8L/min, testing the oxygen content in the composite tube by an oxygen tester, performing root welding when the oxygen content is reduced to below 1%, wherein the root welding ensures that one-side welding and two-side welding are formed, controlling the interlayer temperature to be less than 100 ℃, performing hot welding, filling and cover surface welding in sequence, adopting a multi-layer and multi-channel welding process during filling and cover surface welding, and adopting an automatic upward welding mode for root welding, hot welding, filling and cover surface welding.
S7, performing tensile, bending and impact performance tests and intercrystalline corrosion tests on the girth welded joint welded according to the welding process, wherein the tensile strength is 640Mpa, the welded joint breaks at a base material, no crack is formed in bending, the average value of 0-DEG C impact toughness welding seams is 154J, the average value of a heat affected zone is 99J, the standard requirement of DNV F101 is met, the intercrystalline corrosion rate is 0.294G/(m2 h) at most, and the standard requirement of ASTM G28 is met.
The working principle of the embodiment is as follows: the invention relates to a new welding process with high quality and high efficiency, which is developed on the basis of the traditional TIG welding of a bimetal composite pipe. When in root welding, the welding wire is heated to reach a certain preheating temperature, so that the welding wire is heated, the welding efficiency can be improved, the cladding rate can be obviously improved, and the melting speed of the filler wire is accelerated; during hot welding, filling and cover surface welding, the MIG welding method with high wire feeding speed is adopted, so that the dilution rate of the base metal is reduced, the mechanical property of a welding joint is improved, and the aim of efficient welding is fulfilled.
Example 2
Referring to fig. 1-3, an automatic girth welding process for a bimetal metallurgical composite pipe comprises the following steps:
s1: the selection pipe diameter is 610mm, and basic unit's pipe wall thickness is 22mm, and the cladding wall thickness is 3 mm's bimetal metallurgy composite pipe, and basic unit's pipe chemical composition is C: 0.046, Si: 0.33, Mn: 1.48, P: 0.006, S: 0.003, Cr: 0.24, and the balance of Fe; the chemical composition of the coating is C: 0.023, Si: 0.41, Mn: 0.82, P: 0.005, S: 0.003, Ni: 43.0, Cr: 23.0, Mo: 2.4, Cu: 1.9, Ti: 0.6, Al: 0.07 and the balance of Fe.
S2: and machining a U-shaped groove at the end of the composite pipe, wherein the groove angle is 30 degrees, the truncated edge is 1.5mm, the truncated upper platform is 6.0mm, and the radius of the transition arc is 3.2 mm.
S3: the solid welding wire with the diameter of 1.0mm and the type AWS 5.14ERNiCrMo-3 is selected, the tensile strength of the welding wire is 730Mpa, the elongation after fracture is 44 percent, the impact energy at minus 196 ℃ is 155J, and the weight percentage of chemical components is C: 0.015, Si: 0.41, Mn: 0.47, P: 0.005, S: 0.003, Ni: 65.0, Cr: 22.0, Mo: 9.4, Ti + Nb: 3.28, and the balance Fe.
S4: the root welding is a hot wire tungsten electrode argon arc automatic welding process, the shielding gas is argon, the gas flow is 10L/min, the welding current is 130-140A, the welding voltage is 9.5V, the wire feeding speed is 1.9-2.1 m/min, the hot welding, filling and cover surface welding is a consumable electrode inert gas shielded solid wire automatic welding process, the shielding gas is 90% Ar + 10% He, the gas flow is 12L/min, the hot welding current is 150-160A, the welding voltage is 9.5V, the wire feeding speed is 2.5m/min, and the extending length of a welding wire is 10 mm; the welding current of the filling and cover surface welding is 150-170A, the welding voltage is 10-15V, the wire feeding speed is 6.8m/min, the extending length of a welding wire is 11mm, and the welding polarities of the hot welding, the filling and the cover surface welding are direct current positive welding.
S5: before welding, firstly assembling the bimetal metallurgy composite pipes, wherein the butt gap is 0mm, preheating the groove position, keeping the preheating temperature for 3min when the preheating temperature reaches 40 ℃, and removing water vapor and surface rust on the groove surface.
S6: the method comprises the steps of filling argon gas for protection in the composite pipe, measuring the oxygen content in the composite pipe by an oxygen measuring instrument, carrying out root welding when the oxygen content is reduced to below 1%, wherein the root welding ensures the formation of a single welding surface and a double welding surface, controlling the interlayer temperature to be less than 100 ℃, carrying out hot welding, filling and cover surface welding in sequence, adopting a multi-layer and multi-channel welding process during the filling and cover surface welding, and adopting an automatic upward welding mode for the root welding, the hot welding, the filling and the cover surface welding.
S7: the ring-welded joint welded according to the welding process is subjected to tensile, bending and impact property tests and intercrystalline corrosion tests, the tensile strength is 680Mpa, the ring-welded joint is broken at a base material, no crack is formed in bending, the average value of 0-DEG C impact toughness welding seams is 149J, the average value of a heat affected zone is 105J, the standard requirement of DNV F101 is met, the maximum intercrystalline corrosion rate is 0.237G/(m2 h), and the standard requirement of ASTM G28 is met.
The working principle of the embodiment is as follows: the invention relates to a new welding process with high quality and high efficiency, which is developed on the basis of the traditional TIG welding of a bimetal composite pipe. When in root welding, the welding wire is heated to reach a certain preheating temperature, so that the welding wire is heated, the welding efficiency can be improved, the cladding rate can be obviously improved, and the melting speed of the filler wire is accelerated; during hot welding, filling and cover surface welding, the MIG welding method with high wire feeding speed is adopted, so that the dilution rate of the base metal is reduced, the mechanical property of a welding joint is improved, and the aim of efficient welding is fulfilled.
Having shown and described the basic principles and essential features of the invention and its advantages, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof, and it is therefore intended that the embodiments be considered as illustrative and not restrictive in all respects, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, any reference signs in the claims being therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. An automatic girth welding process for a bimetal metallurgical composite pipe is characterized by comprising the following steps:
s1: the method comprises the following steps of selecting a bimetal metallurgy composite pipe, wherein a base layer pipe of the bimetal metallurgy composite pipe is an X60 steel pipe, and the chemical composition is C: 0.03 to 0.05, Si: 0.25 to 0.35, Mn: 1.40-1.60, P: less than or equal to 0.008S: less than or equal to 0.005, Cr: less than or equal to 0.30, and the balance of Fe; the coating is Incoloy825 corrosion-resistant alloy, and the chemical components are C: 0.05 or less, Si: less than or equal to 0.50, Mn: 1.0 or less, P: 0.005 or less, S: 0.003 or less, Ni: 38.0-45.0, Cr: 20.0-23.0, Mo: 2.5-3.5, Cu: 1.8-3.0, Ti: 0.6-1.2, Al: less than or equal to 0.15, and the balance of Fe;
s2: machining a groove, namely machining a U-shaped groove at the pipe end of the bimetal metallurgy composite pipe, wherein the angle of the groove is 20-40 degrees, the truncated edge is 1.5-1.8 mm, the upper platform of the truncated edge is 4.0-6.0 mm, and the radius of a transition arc is 2.5-3.5 mm;
s3: the welding material selection, root welding, hot welding, filling welding and cover surface welding all adopt solid welding wires with the diameter of 1.0mm and the model AWS 5.14ERNiCrMo-3, the tensile strength is 700-790 Mpa, the elongation after fracture is 43-48 percent, the impact energy at minus 196 ℃ is 145-165J, and the chemical components by weight percentage are C: 0.01 to 0.02, Si: less than or equal to 0.50, Mn: less than or equal to 0.5, P: 0.005 or less, S: 0.003 or less, Ni: not less than 58.0, Cr: 20.0 to 23.0, Mo: 8.0-10.0, Ti + Nb: 3.2-4.0, and the balance of Fe;
s4: setting welding parameters of root welding, wherein the root welding adopts a hot wire argon tungsten-arc automatic welding process, the shielding gas is argon, the gas flow is 5-10L/min, the welding current is 120-140A, the welding voltage is 9.0-10.0V, the wire feeding speed is 1.8-2.2 m/min, and the welding polarity of the root welding is direct current positive connection;
s5: setting welding parameters of hot welding, filling and cover surface welding, wherein the hot welding, the filling and the cover surface welding adopt a consumable electrode inert gas protection solid welding wire automatic welding process, the gas flow is 10-15L/min, the hot welding current is 140-180A, the welding voltage is 9.0-10.0V, and the wire feeding speed is 2.0-3.0 m/min; the welding current of filling and cover surface welding is 150-210A, the welding voltage is 10-18V, the wire feeding speed is 3.0-7.0 m/min, the welding polarities of hot welding, filling and cover surface welding are direct current positive welding, and the extension length of a welding wire is 8-15 mm;
s6: welding, before welding, firstly assembling the bimetal metallurgy composite pipes, keeping the gap between the openings at 0mm, preheating the positions of grooves, keeping the preheating temperature at 30-50 ℃, keeping the temperature for 3-5 min, mainly removing water vapor and surface rust, then carrying out root welding, before the root welding, filling argon for protection, wherein the gas flow is 5-8L/min, the root welding seam ensures the formation of a single-side welding double-side, carrying out hot welding, filling and cover surface welding in sequence, controlling the interlayer temperature to be less than 100 ℃, adopting a multi-layer and multi-channel welding process during the filling and cover surface welding, and adopting an automatic upward welding mode (welding 12-point position from 6-point position) for the root welding, the hot welding, the filling and the cover surface welding.
2. The automatic girth welding process for the bimetal metallurgical composite pipe as claimed in claim 1, wherein the Fe in S1 is the balance Fe.
3. The automatic girth welding process for the bimetal metallurgical composite pipe as claimed in claim 2, wherein the shielding gas in the S5 is (70% Ar + 30% He) to (90% Ar + 10% He).
4. The automatic girth welding process of the bimetal metallurgy composite pipe as claimed in claim 3, wherein the diameter of the bimetal metallurgy composite pipe is 508-813 mm, the wall thickness of the base layer pipe is 20-30mm, the wall thickness of the coating layer is 2-3mm, during welding, 1 welding is carried out for the root, 1-2 welding is carried out for the hot welding, 7-9 welding is carried out for filling, and 1-2 welding is carried out for the cover surface.
5. The automatic girth welding process of the bimetal metallurgical composite pipe as claimed in claim 4, wherein in the step S4, argon is filled into the composite pipe for protection before root welding, the gas flow is 5-8L/min, the root welding seam ensures the formation of one-side welding and two-side welding, the hot welding, filling and cover welding are carried out in sequence, and the interlayer temperature is controlled to be less than 100 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210708768.9A CN114951903A (en) | 2022-06-22 | 2022-06-22 | Automatic girth welding process for bimetal metallurgical composite pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210708768.9A CN114951903A (en) | 2022-06-22 | 2022-06-22 | Automatic girth welding process for bimetal metallurgical composite pipe |
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| CN114951903A true CN114951903A (en) | 2022-08-30 |
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| CN202210708768.9A Pending CN114951903A (en) | 2022-06-22 | 2022-06-22 | Automatic girth welding process for bimetal metallurgical composite pipe |
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| Country | Link |
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| CN (1) | CN114951903A (en) |
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