CN116921815A - Semi-automatic welding method for 2205 duplex stainless steel pipe girth welds - Google Patents
Semi-automatic welding method for 2205 duplex stainless steel pipe girth welds Download PDFInfo
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- CN116921815A CN116921815A CN202210327207.4A CN202210327207A CN116921815A CN 116921815 A CN116921815 A CN 116921815A CN 202210327207 A CN202210327207 A CN 202210327207A CN 116921815 A CN116921815 A CN 116921815A
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- 238000003466 welding Methods 0.000 title claims abstract description 290
- 238000000034 method Methods 0.000 title claims abstract description 34
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 58
- 239000007789 gas Substances 0.000 claims description 54
- 229910052786 argon Inorganic materials 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 22
- 229910000859 α-Fe Inorganic materials 0.000 claims description 14
- 238000007689 inspection Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 11
- 239000011261 inert gas Substances 0.000 claims description 8
- 239000011229 interlayer Substances 0.000 claims description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 4
- 230000007547 defect Effects 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 18
- 238000005260 corrosion Methods 0.000 abstract description 18
- 238000005516 engineering process Methods 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 238000003908 quality control method Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 5
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—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
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
- B23K9/287—Supporting devices for electrode holders
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention provides a 2205 duplex stainless steel pipe girth joint semiautomatic welding method, in particular to the field of oil and gas field ground engineering application, and provides a novel welding technology for 2205 duplex stainless steel pipe girth joint field welding by adopting a composite welding mode of performing root welding, TIG semiautomatic welding, transitional welding and filling welding and MIG semiautomatic welding and performing cover welding by selecting a high corrosion resistant alloy welding material, solving the problems of poor welding corrosion resistance, high manual welding difficulty and low efficiency of welding lines, and simultaneously overcoming the problems of low single TIG automatic welding efficiency and poor single MIG automatic welding quality control. The method is suitable for the field welding of the girth weld of the 2205 duplex stainless steel pipe for oil and gas transportation, and the wall thickness of the steel pipe is not more than 20mm.
Description
Technical Field
The invention belongs to the field of ground engineering application of oil and gas fields, and particularly relates to a 2205 duplex stainless steel pipe girth weld semi-automatic welding method.
Background
With the gradual progress of oil and gas exploration and development of China to unconventional oil and gas fields, the extracted medium and the service working condition are more and more harsh, and the corrosion resistance of the pipe is very high. 2205 duplex stainless steel has pitting corrosion resistance equivalent weight far higher than 316L and yield strength twice higher than 316L, and the excellent corrosion resistance and mechanical properties enable the duplex stainless steel to be increasingly used in high-corrosiveness oil and gas fields, in particular to Tarim oil fields of the origin of the east-west gas transmission in China. In recent years, the production technology of the domestic 2205 duplex stainless steel pipe is steadily improved, the price of the steel pipe is greatly reduced compared with that of imported pipes, and the steel pipe has the condition of being widely used for highly corrosive oil and gas fields. However, 2205 duplex stainless steel has a ferrite-austenite two-phase structure, and thus has the advantages of both ferrite stainless steel and austenitic stainless steel, and also has the disadvantage that ferrite stainless steel is prone to phase precipitation. Because of the complex phase change characteristics and the special requirements of the proportion of two phases in the welding process of the duplex stainless steel, the welding process is complex, the requirements of welding workers are high, the primary qualification rate is low, and the welding efficiency is low. At present, the main mode of on-site pipeline welding still adopts manual argon electric joint welding, and the welding quality and the welding efficiency are difficult to be simultaneously considered. Meanwhile, the failure of the pipelines in the Tarim oil field shows that the corrosion resistance of the girth weld compared with the base metal is a main problem of corrosion failure.
From the above analysis, 2205 duplex stainless steel pipes are urgently required to improve the in-situ welding process to reduce the welding difficulty, improve the welding efficiency and the weld corrosion resistance. The related literature reports mainly research on the influence relationship between the welding process and performance of manual welding of the duplex stainless steel pipe, such as the influence of welding current, welding line energy and the like on the structure, mechanical property and corrosion resistance, but the research on the automatic welding technology is less. The invention patent related to the duplex stainless steel in Chinese patent publication is mainly a welding method of plates and pipes used in chemical industry, marine ships and the like, the automatic welding technology for oil and gas pipelines has little authorization, and only a full-automatic argon arc welding method of the girth weld of the duplex stainless steel pipeline is proposed by the oil and gas (Xinjiang) petroleum engineering limited company. The argon tungsten-arc welding (TIG) heat input is easy to control, the welding quality is stable, and the argon tungsten-arc welding (TIG) is widely applied to factories and field welding, but the welding efficiency is lower; the heat input of the Metal Inert Gas (MIG) is easier to control, the quality is more stable, the field application is less, but the welding efficiency is high. In comparison, the full-automatic welding equipment is complex, the requirement on the welding site is high, and the convenience of field construction is poor; the semiautomatic welding technology can realize automatic wire feeding, so that the welding difficulty is remarkably reduced, and meanwhile, equipment required by semiautomatic welding is similar to that required by manual welding, so that the site adaptability is good. In addition, the welding is carried out by adopting the high corrosion resistant alloy element welding material, and the welding is applied to a part of foreign tube factories, so that the corrosion resistance of the welding seam is expected to be obviously improved. Therefore, the semi-automatic welding method for 2205 duplex stainless steel pipe girth welds is researched, so that the advantages of better TIG welding forming quality and higher MIG welding efficiency are maintained as much as possible, the root welding corrosion resistance is improved, and high welding quality, welding seam corrosion resistance, welding efficiency and field adaptability are finally realized.
Disclosure of Invention
The invention provides a 2205 duplex stainless steel pipe girth weld semi-automatic welding method, which is used for meeting the requirements of improving an on-site welding process, reducing welding difficulty and improving welding efficiency and weld corrosion resistance.
In order to achieve the above purpose, the invention proposes the following technical scheme:
a2205 duplex stainless steel pipe girth weld semi-automatic welding method comprises the following steps:
step one, groove treatment: adopting a beveling machine to process the welding port into a U-shaped groove;
secondly, steel tube group pairs: the outer aligning device is adopted to assist aligning, the two steel pipes are approximately aligned at first, then the outer aligning device is utilized to fix the two steel pipes, and the pipes are aligned step by step through the fine adjusting screw;
thirdly, preparing before welding:
(a) Adopting a cleaning tool to clean greasy dirt, rust, water and other impurities within 20mm of the inner surface and the outer surface of two sides of the groove
Removing the mass;
(b) Adopting a protection device to form a sealed space within the range of 100mm on both sides of a welding line in the steel pipe, then injecting inert gas into the sealed space to remove oxygen, and reaching the welding condition when the oxygen content is lower than 50ppm, wherein the inert gas is in the whole process
Protecting;
(c) Connecting a welding gun and debugging equipment, and preheating the steel pipe to 50-80 ℃ if the ambient temperature is lower than 10 ℃;
(d) Adopting multi-layer multi-pass welding, wherein a welding port is divided into a root welding area, a transition welding area, a filling welding area and a cover welding area from bottom to top; the root welding area, the transition welding area and the filling welding area adopt a semi-automatic TIG welding machine, and the cover welding area adopts a semi-automatic MIG welding machine;
the root welding area adopts a welding material to select a TIG welding solid welding wire of ER2594 to connect a cathode, and the specification phi is 1.6mm;
preferably, the U-shaped groove angle alpha is more than 10 ℃ and less than 15 ℃, the circular arc radius R is 2.4mm, the blunt edge height p is more than 1.5mm and less than 1.7mm, the blunt edge length L is more than 1.2 and less than 1.4mm, and the pairing gap is 0mm.
Preferably, in the second step, the allowable misalignment amount of the steel pipe assembly is not more than 1% of the pipe diameter, and the maximum misalignment amount is not more than 1.6mm.
Preferably, in the third step (b), the inert gas is injected with argon having a purity of 99.995%.
Preferably, in the third step, root welding: the welding gun shielding gas is pure argon with purity not lower than 99.99%, the gas flow is 15-20L/min, the back shielding gas is pure argon with purity not lower than 99.99%, the gas flow is 10-18L/min, upward welding is adopted, the welding gun does not swing, the welding current is 70-100A, the welding voltage is 9-12V, the welding speed is 20-30 mm/min, the wire feeding speed is 0.4-0.7 m/min, and supporting and evacuating are carried out after root welding is completed;
and (3) transition welding: the welding material is selected from TIG welding solid welding wires of ER2209 to be connected with a cathode, the specification phi is 1.0mm, the welding gun shielding gas is pure argon, the purity is not lower than 99.99 percent, the gas flow is 15-20L/min, the back shielding gas is pure argon, the purity is not lower than 99.99 percent, the gas flow is 10-18L/min, upward welding is adopted, the welding gun does not swing, the interlayer temperature is controlled at 70-120 ℃, the welding current of transition welding is 85-200A, the welding voltage is 9-10V, the welding speed is 80-170 mm/min, and the wire feeding speed is 1.4-1.6 m/min;
filling welding: the welding material is selected from TIG welding solid welding wires of ER2209 to be connected with a cathode, the specification phi is 1.0mm, the welding gun shielding gas is pure argon, the purity is not lower than 99.99 percent, the gas flow is 15-20L/min, the back shielding gas is pure argon, the purity is not lower than 99.99 percent, the gas flow is 10-18L/min, the welding gun does not swing by upward welding, and the interlayer temperature is controlled at 70-120 ℃; filling welding current is 115-230A, welding voltage is 9-10V, welding speed is 120-170 mm/min, and wire feeding speed is 1.5-1.7 m/min;
cover welding: the welding material is MIG welding solid welding wire of ER2209, which is connected with the positive electrode, the specification phi is 1.2mm, the welding gun shielding gas is 95 percent argon+5 percent carbon dioxide, the purity is not lower than 99.99 percent, the gas flow is 15-20L/min, the back shielding gas is pure argon, the purity is not lower than 99.99 percent, and the gas flow is 10-18L/min; by adopting upward welding, the welding gun does not swing, the interlayer temperature is controlled at 70-120 ℃, the welding current is 85-115A, the welding voltage is 16-20V, the welding speed is 80-100 mm/min, and the wire feeding speed is 3.0-3.5 m/min.
Preferably, the method further comprises a fourth step of post-welding inspection: after the welded seam is cooled to normal temperature, visual appearance inspection, robot endoscope camera internal detection, ferrite content detection and nondestructive detection are carried out;
nondestructive inspection requires 100% X-ray and 100% ultrasonic flaw detection, and if ultrasonic flaw detection cannot be performed, 100% penetration detection is increased.
Preferably, the appearance inspection is required to be free of cracks, incomplete penetration, burning-through and other defects, the welding seam is neat and uniform, the internal and external residual heights are lower than 2.0mm, and the undercut depth of the cover welding bead is not more than 10% of the thickness of the pipe wall and not more than 0.5mm.
Preferably, the robot endoscope is used for detecting whether the inner wall has the phenomenon of oxidation of the inner wall or bad root welding molding in the imaging.
Preferably, the ferrite content detection specifically includes: detecting whether the ferrite content of the welding seam is 30-60% or not, and detecting whether the ferrite content of the heat affected zone is 30-70% or not.
The invention has the advantages that:
compared with a manual welding system, the semi-automatic welding system is light and simple, the automatic wire feeding control system is only added, the adaptability of different application environments on site is strong, the operation difficulty and labor intensity of welders are obviously reduced, the required support guarantee is less, and the semi-automatic welding system can be rapidly applied to the field construction site.
The ER2594 welding wire is adopted for root welding, so that the welding difficulty and the welding cost are not obviously increased, the aim that the root welding corrosion resistance is better than that of a base metal is fulfilled, and the corrosion resistance of the whole pipeline is integrally improved.
The welding difficulty is reduced by adopting TIG semi-automatic welding, transitional welding and filling welding, the welding quality is improved, the number of layers of filling welding is reduced by adopting MIG automatic welding to carry out cosmetic welding, the welding speed is improved, and finally, the welding time of the whole joint is shortened by more than 20% compared with that of full TIG semi-automatic welding.
Drawings
The accompanying drawings, which are included to provide a further understanding 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 invention. In the drawings:
fig. 1 is a schematic view of a joint groove form.
Fig. 2 is a schematic view of a joint multi-layer weld bead.
Fig. 3 is a schematic diagram of an automated welding system.
Fig. 4 is a flow chart of a 2205 duplex stainless steel pipe girth weld semi-automatic welding method.
In the figure, 1 is a root welding area, 2 is a transition welding area, 3 and 4 are filling welding areas, and 5 is a cover welding area; alpha is the bevel angle, R is the arc radius, p is the blunt edge height, and L is the blunt edge length.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the invention. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
Example 1:
a2205 duplex stainless steel pipe girth weld semi-automatic welding method, the flow chart is shown in figure 4, comprises the following steps:
step one, groove treatment: the special beveling machine for stainless steel is adopted, a U-shaped bevel is formed by machining, the bevel angle alpha is between 10 and 15 ℃, the arc radius R is 2.4mm, the blunt edge height p is between 1.5 and 1.7mm, the blunt edge length L is between 1.2 and 1.4mm, the pairing gap is 0mm, and the joint bevel form is shown in figure 1.
Secondly, steel tube group pairs: the outer aligning device is adopted to assist aligning, the two steel pipes are aligned approximately first, then the outer aligning device is utilized to fix the two steel pipes, the pipes are aligned gradually through the fine adjusting screw, the allowable offset is not more than 1% of the pipe diameter, and the maximum offset is not more than 1.6mm.
Thirdly, preparing before welding:
(a) Adopting a special cleaning tool for stainless steel to remove greasy dirt, rust, water and other impurities within 20mm of the inner and outer surfaces of two sides of the groove;
(b) Forming a sealed space in a range of over 100mm on two sides of a welding line in the steel pipe by adopting a protection device, then injecting gas inwards to remove oxygen, wherein the optional gas comprises 99.995% of pure argon, and when the oxygen content is lower than 50ppm, the welding can be started, and the whole process is protected by inert gas;
(c) Connecting a welding gun and debugging equipment, and preheating the steel pipe to 50-80 ℃ if the ambient temperature is lower than 10 ℃;
(d) The multi-layer multi-pass welding is adopted, a multi-layer welding bead schematic diagram of the girth weld is shown in fig. 2, 1 is a root welding zone, 2 is an excessive welding zone, 3 and 4 are filling welding zones, and 5 is a cover welding zone.
Wherein:
root welding: a semi-automatic TIG welding machine (a welding system schematic view is shown in figure 3) is adopted, a TIG welding solid welding wire of ER2594 is selected as a welding material to be connected with a cathode, the specification phi is 1.6mm, the welding gun shielding gas is pure argon, the purity is not lower than 99.99%, the gas flow is 15-20L/min, the back shielding gas is pure argon, the purity is not lower than 99.99%, the gas flow is 10-18L/min, upward welding is adopted, the welding gun does not swing, the welding current is 70-100A, the welding voltage is 9-12V, the welding speed is 20-30 mm/min, the wire feeding speed is 0.4-0.7 m/min, and the support is removed after root welding is completed.
And (3) transition welding and filling welding: a semi-automatic TIG welding machine is adopted, a welding material is a TIG welding solid welding wire of ER2209, the welding material is a cathode, the specification phi is 1.0mm, the welding gun shielding gas is pure argon, the purity is not lower than 99.99%, the gas flow is 15-20L/min, the back shielding gas is pure argon, the purity is not lower than 99.99%, the gas flow is 10-18L/min, upward welding is adopted, the welding gun does not swing, and the interlayer temperature is controlled at 70-120 ℃; the welding current of the transition welding is 85-200A, the welding voltage is 9-10V, the welding speed is 80-170 mm/min, and the wire feeding speed is 1.4-1.6 m/min; the filling welding current is 115-230A, the welding voltage is 9-10V, the welding speed is 120-170 mm/min, and the wire feeding speed is 1.5-1.7 m/min.
Cover welding: adopting a semi-automatic MIG welding machine (a welding system schematic diagram is shown in figure 3), wherein a welding material is an MIG welding solid welding wire of ER2209, the specification phi is 1.2mm, the welding gun shielding gas is 95% argon+5% carbon dioxide, the purity is not lower than 99.99%, the gas flow is 15-20L/min, the back shielding gas is pure argon, the purity is not lower than 99.99%, and the gas flow is 10-18L/min; the upward welding is adopted, the welding gun does not swing, the interlayer temperature is controlled at 70-120 ℃, the welding current is 85-115A, the welding voltage is 16-20V, the welding speed is 80-100 mm/min, and the wire feeding speed is 3.0-3.5 m/min
Fourth, post-welding inspection: after welding, carrying out visual appearance inspection, robot endoscope camera shooting internal detection, ferrite content detection and nondestructive detection after the welding line is cooled to normal temperature, wherein the visual appearance inspection is required to be crack-free, incomplete welding, burning-through and other defects, the welding line is orderly and uniform, the internal and external residual heights are lower than 2.0mm, and the undercut depth of the capping welding line is not more than 10% of the pipe wall thickness and not more than 0.5mm; detecting whether defects such as oxidation of the inner wall, poor root welding forming and the like exist on the inner wall; the ferrite content is controlled to be 30-60% at the weld joint, and the heat affected zone is controlled to be 30-70%; nondestructive inspection requires 100% X-ray and 100% ultrasonic flaw detection, and if ultrasonic flaw detection cannot be performed, 100% penetration detection is increased.
Fifthly, welding process assessment: the pipe diameter is below 114mm, and the welded joint is subjected to grooving hammer breaking, back bending, hardness, impact, chemical, ferrite phase content and harmful phase detection, 6% ferric trichloride pitting test and 25% boiling magnesium chloride stress corrosion cracking test;
the pipe diameter is more than 114mm, and the welding joint is subjected to stretching, grooving hammering, bending, hardness, impact, chemical, ferrite phase content and harmful phase detection, 6% ferric trichloride pitting test and 25% boiling magnesium chloride stress corrosion cracking test;
all tests meet the Q/SY TZ 0110 standard requirement, namely the requirements of on-site operation are met through welding process assessment.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (9)
1. A 2205 duplex stainless steel pipe girth weld semi-automatic welding method, which is characterized by comprising the following steps:
step one, groove treatment: adopting a beveling machine to process the welding port into a U-shaped groove;
secondly, steel tube group pairs: the outer aligning device is adopted to assist aligning, the two steel pipes are approximately aligned at first, then the outer aligning device is utilized to fix the two steel pipes, and the pipes are aligned step by step through the fine adjusting screw;
thirdly, preparing before welding:
(a) Adopting a cleaning tool to remove greasy dirt, rust, water and other impurities within 20mm of the inner surface and the outer surface of each side of the groove;
(b) Forming a sealing space within a range of 100mm on two sides of a welding line in the steel pipe by adopting a protection device, then injecting inert gas into the sealing space to remove oxygen, and when the oxygen content is lower than 50ppm, achieving welding conditions and protecting the whole process by the inert gas;
(c) Connecting a welding gun and debugging equipment; if the ambient temperature is lower than 10 ℃, preheating the steel tube to 50-80 ℃;
(d) Adopting multi-layer multi-pass welding, wherein a welding port is divided into a root welding area, a transition welding area, a filling welding area and a cover welding area from bottom to top; the root welding area adopts a welding material to select a TIG welding solid welding wire of ER2594 to connect a cathode, and the specification phi is 1.6mm; the root welding area, the transition welding area and the filling welding area adopt a semi-automatic TIG welding machine, and the cover welding area adopts a semi-automatic MIG welding machine.
2. The semi-automatic welding method for 2205 duplex stainless steel pipe girth welds according to claim 1, wherein the U-shaped groove angle α is greater than 10 ℃ and less than 15 ℃, the radius R of the arc is 2.4mm, the height p of the blunt edge is greater than 1.5mm and less than 1.7mm, the length L of the blunt edge is greater than 1.2mm and less than 1.4mm, and the pairing gap is 0mm.
3. A 2205 duplex stainless steel pipe girth weld semi-automatic process as claimed in claim 1, wherein in the second step the allowable misalignment of the steel pipe assembly is no more than 1% of the pipe diameter, and no more than 1.6mm at maximum.
4. The method for semi-automatic girth welding of 2205 duplex stainless steel tube according to claim 1, wherein in the third step (b), the inert gas is injected with argon having a purity of 99.995%.
5. A2205 duplex stainless steel pipe girth weld semi-automatic process as claimed in claim 1, wherein,
in the third step, root welding: the welding gun shielding gas is pure argon with purity not lower than 99.99%, the gas flow is 15-20L/min, the back shielding gas is pure argon with purity not lower than 99.99%, the gas flow is 10-18L/min, upward welding is adopted, the welding gun does not swing, the welding current is 70-100A, the welding voltage is 9-12V, the welding speed is 20-30 mm/min, the wire feeding speed is 0.4-0.7 m/min, and supporting and evacuating are carried out after root welding is completed;
and (3) transition welding: the welding material is selected from TIG welding solid welding wires of ER2209 to be connected with a cathode, the specification phi is 1.0mm, the welding gun shielding gas is pure argon, the purity is not lower than 99.99 percent, the gas flow is 15-20L/min, the back shielding gas is pure argon, the purity is not lower than 99.99 percent, the gas flow is 10-18L/min, upward welding is adopted, the welding gun does not swing, the interlayer temperature is controlled at 70-120 ℃, the welding current of transition welding is 85-200A, the welding voltage is 9-10V, the welding speed is 80-170 mm/min, and the wire feeding speed is 1.4-1.6 m/min;
filling welding: the welding material is selected from TIG welding solid welding wires of ER2209 to be connected with a cathode, the specification phi is 1.0mm, the welding gun shielding gas is pure argon, the purity is not lower than 99.99 percent, the gas flow is 15-20L/min, the back shielding gas is pure argon, the purity is not lower than 99.99 percent, the gas flow is 10-18L/min, the welding gun does not swing by upward welding, and the interlayer temperature is controlled at 70-120 ℃; filling welding current is 115-230A, welding voltage is 9-10V, welding speed is 120-170 mm/min, and wire feeding speed is 1.5-1.7 m/min;
cover welding: the welding material is MIG welding solid welding wire of ER2209, which is connected with the positive electrode, the specification phi is 1.2mm, the welding gun shielding gas is 95 percent argon+5 percent carbon dioxide, the purity is not lower than 99.99 percent, the gas flow is 15-20L/min, the back shielding gas is pure argon, the purity is not lower than 99.99 percent, and the gas flow is 10-18L/min; by adopting upward welding, the welding gun does not swing, the interlayer temperature is controlled at 70-120 ℃, the welding current is 85-115A, the welding voltage is 16-20V, the welding speed is 80-100 mm/min, and the wire feeding speed is 3.0-3.5 m/min.
6. The semi-automatic welding method of 2205 duplex stainless steel pipe girth welds of claim 1, further comprising the fourth step of post weld inspection: after the welded seam is cooled to normal temperature, visual appearance inspection, robot endoscope camera internal detection, ferrite content detection and nondestructive detection are carried out;
nondestructive inspection requires 100% X-ray and 100% ultrasonic flaw detection, and if ultrasonic flaw detection cannot be performed, 100% penetration detection is increased.
7. The semi-automatic welding method for 2205 duplex stainless steel pipe girth welds according to claim 6, wherein said appearance inspection is required to be crack-free, penetration-free, burn-through and other defects, the weld should be uniform, the internal and external residual height should be less than 2.0mm, and the undercut depth of the cap bead should not be more than 10% of the pipe wall thickness and not more than 0.5mm.
8. The semi-automatic welding method of 2205 duplex stainless steel pipe girth welds according to claim 6, wherein said robot endoscope detects in the camera whether there is oxidation of the inner wall or bad formation of root welding.
9. The 2205 duplex stainless steel pipe girth welding semiautomatic welding method as claimed in claim 6, wherein said ferrite content detection specifically comprises: detecting whether the ferrite content of the welding seam is 30-60% or not, and detecting whether the ferrite content of the heat affected zone is 30-70% or not.
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