CN112620897A - Welding method for ultra-low carbon type nickel-based hastelloy pipeline - Google Patents
Welding method for ultra-low carbon type nickel-based hastelloy pipeline Download PDFInfo
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- CN112620897A CN112620897A CN202011373497.3A CN202011373497A CN112620897A CN 112620897 A CN112620897 A CN 112620897A CN 202011373497 A CN202011373497 A CN 202011373497A CN 112620897 A CN112620897 A CN 112620897A
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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
- B23K9/18—Submerged-arc welding
- B23K9/186—Submerged-arc welding making use of a consumable electrodes
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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
- B23K9/235—Preliminary treatment
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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
- B23K9/32—Accessories
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- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a welding method of an ultra-low carbon type nickel-based hastelloy pipe, which comprises the following steps: the welding method adopts a groove form with a large groove angle and a small truncated edge to ensure that deposited metal is solidified at a proper position and ensure the welding quality; meanwhile, a swing welding method is adopted, so that the flow of the liquid metal is accelerated, the fusion of the liquid metal is ensured, and the two ends of the groove are slightly paused so that the fusion is good; and a method of low current and high speed welding is adopted, welding heat input is reduced, so that temperature concentration and high temperature retention time are reduced, and the interlayer temperature is strictly controlled to be less than or equal to 100 ℃; the method greatly reduces the generation of welding thermal cracks, improves the welding quality of the pipeline, and reduces the generation of unfused and undercut defects.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a welding method of an ultra-low carbon type nickel-based hastelloy pipe.
Background
The ultra-low carbon nickel-based Hastelloy (Hastelloy-C-276) domestic brand NS334 is a tungsten-containing nickel-chromium-molybdenum forged alloy, is characterized by high melting point, heat resistance, corrosion resistance, high strength, good oxidation resistance, mechanical property and processability, can resist the corrosion of various corrosive media within the range of 200-1090 ℃, and is considered as a universal corrosion-resistant alloy. Therefore, the method has been widely applied in harsh working environments, such as the fields of chemical industry, petroleum industry and the like, for decades. The problem of medium corrosion which can not be solved by common stainless steel and other metal and non-metal materials is solved.
The existing welding of the ultra-low carbon type nickel-based hastelloy has the following problems:
1. the hot cracking tendency is large: during welding, Ni, S, P, C and the like form low-melting-point eutectic, and meanwhile, part of strengthening elements and C form carbide and exist in grain boundaries, and cracks are initiated due to the action of shrinkage stress;
2. because the liquid metal has poor fluidity and fusion is not good, the defects of non-fusion, undercut and the like are easily caused.
Therefore, how to solve the defects of the prior art is a subject of the present invention.
Disclosure of Invention
In order to solve the problems, the invention discloses a welding method of an ultra-low carbon type nickel-based hastelloy pipe.
In order to achieve the above purpose, the invention provides the following technical scheme: a welding method of an ultra-low carbon type nickel-based hastelloy pipe comprises the following steps:
the method comprises the following steps: pre-welding pretreatment: cutting a groove at the end to be welded of the pipeline, removing oil stains and surface oxidation layers around the groove, and then coating anti-sticking agent on the groove and the area around the groove; wherein the bevel is a V-shaped bevel, the angle of the bevel is 65 +/-5 degrees, the truncated edge is 0.5-1.5mm, and the pairing gap between the bevels is 2-3 mm;
step two: welding: backing welding, hot welding and cover surface filling operation are sequentially carried out;
argon arc backing welding is adopted during backing welding, argon gas is filled on the welding back for protection, small swing welding is adopted during backing welding, the welding current is controlled to be 70-90A, the welding voltage is controlled to be 8-12V, the welding speed is controlled to be 6-7cm/min, and oxides on the surface of a molten pool are thrown to the edge of a welding bead during welding;
the welding current during the heat welding is controlled at 100-140A, the welding voltage is controlled at 10-14V, and the welding speed is controlled at 8-12 cm/min;
manual electric arc welding is adopted when the cover surface is filled, and the interlayer temperature is controlled to be less than or equal to 100 ℃; swinging is carried out during strip conveying, and the swinging amplitude is not more than 2.5 times of the diameter of the welding rod, so that the formation of a welding seam is ensured; cleaning sundries on the surface of the weld bead after each layer of welding is finished;
controlling the welding current to be 80-100A when the cover surface is filled, controlling the welding voltage to be 21-23V, and controlling the welding speed to be 8-12 cm/min;
joints of each welding bead are arranged in a staggered manner in the welding process;
step three: post-welding treatment: after welding, checking the surface molding condition of the welding line, wherein the qualified welding line is a convex welding line and cannot have undercut; when a defect occurs, polishing the defect position until the defect position is polished completely, and performing repair welding by adopting an argon arc welding method, wherein the interlayer temperature is less than or equal to 100 ℃;
and after the repair welding is finished, the surface of the welding line is cleaned up and then the detection is carried out again.
Further, when removing the oil stains around the groove in the first step, acetone or absolute ethyl alcohol is used for removing the oil stains on the surface.
Furthermore, in the first step, the cleaning range of the groove is within 50mm of both sides and the back of the groove, and the coating range of the anti-adhesion agent is within 100mm of both sides of the groove.
Further, arc striking and arc extinguishing at the groove are avoided in the welding process of the second step
Furthermore, after each layer of welding is finished when the cover surface is filled in the second step, a grinding wheel or a stainless steel wire wheel is used for cleaning sundries on the surface of the welding bead.
Further, the anti-fouling agent is chalk powder.
Compared with the prior art, the invention has the following advantages: the welding method adopts the groove form of large groove angle and small truncated edge to ensure that deposited metal is solidified at a proper position and ensure the welding quality; meanwhile, a swing welding method is adopted, so that the flow of the liquid metal is accelerated, the fusion of the liquid metal is ensured, and the two ends of the groove are slightly paused so that the fusion is good; and a method of low current and high speed welding is adopted, welding heat input is reduced, so that temperature concentration and high temperature retention time are reduced, and the interlayer temperature is strictly controlled to be less than or equal to 100 ℃; the method greatly reduces the generation of welding thermal cracks, improves the welding quality of the pipeline, and reduces the generation of unfused and undercut defects.
Drawings
FIG. 1 is a schematic diagram of the groove structure of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The welding method of the following examples is
The method comprises the following steps: pre-welding pretreatment: cutting a groove at the end to be welded of the pipeline, removing oil stains and surface oxide layers around the groove, and removing the oil stains on the surface by adopting acetone or absolute ethyl alcohol; coating chalk powder anti-adhesion agent on the groove and the area around the groove; referring to fig. 1, the groove is a V-shaped groove, the angle of the groove is 65 +/-5 degrees, the truncated edge is 0.5-1.5mm, and the pairing gap between the grooves is 2-3 mm;
specifically, when removing oil stains around the groove, acetone or absolute ethyl alcohol is adopted to remove oil stains on the surface of the groove, the cleaning range of the groove is within 50mm of the two sides and the back of the groove, and the coating range of the anti-stain agent is within 100mm of the two sides of the groove;
step two: welding: backing welding, hot welding and cover surface filling operation are sequentially carried out; and arc striking and arc extinguishing at the groove part are avoided in the welding process so as to prevent arc crater cracks from being generated at the welding seam by accident
Argon arc backing welding is adopted during backing welding, argon gas is filled on the welding back for protection, small swing welding is adopted during backing welding, the welding current is controlled to be 70-90A, the welding voltage is controlled to be 8-12V, the welding speed is controlled to be 6-7cm/min, and oxides on the surface of a molten pool are thrown to the edge of a welding bead during welding;
the welding current during the heat welding is controlled at 100-140A, the welding voltage is controlled at 10-14V, and the welding speed is controlled at 8-12 cm/min;
manual electric arc welding is adopted when the cover surface is filled, and the interlayer temperature is controlled to be less than or equal to 100 ℃; swinging is carried out during strip conveying, and the swinging amplitude is not more than 2.5 times of the diameter of the welding rod, so that the formation of a welding seam is ensured; after each layer of welding is finished, cleaning sundries on the surface of the welding bead by using a grinding wheel or a stainless steel wire wheel;
controlling the welding current to be 80-100A when the cover surface is filled, controlling the welding voltage to be 21-23V, and controlling the welding speed to be 8-12 cm/min;
joints of each welding bead are arranged in a staggered manner in the welding process;
during welding, a small-amplitude swinging welding mode is adopted, so that the flow of liquid metal can be accelerated, and the fusion of the liquid metal is ensured;
meanwhile, the operation during arc closing is also needed to be noticed during welding, and the welding speed is reduced during arc closing so as to increase the filling amount of deposited metal to fill a molten pool.
In the welding process, the current and the voltage are controlled, so that the small welding line energy can be ensured and the interlayer temperature can be strictly controlled during welding; the purpose is that the welding joint is overheated due to larger welding line energy and interlayer temperature, coarse grains are generated, and the mechanical property and the corrosion resistance of the welding joint are reduced due to the coarse grains; meanwhile, the low-melting-point eutectic crystal formed by Ni and S, P, C and the like can be aggregated on the boundaries of coarse grains; due to the low strength of these low melting eutectic cracks will form under the effect of the welding stress.
Step three: post-welding treatment: after welding, checking the surface molding condition of the welding line, wherein the qualified welding line is a convex welding line and cannot have undercut; when a defect occurs, polishing the defect position until the defect position is polished completely, and performing repair welding by adopting an argon arc welding method, wherein the interlayer temperature is less than or equal to 100 ℃;
and after the repair welding is finished, the surface of the welding line is cleaned up and then the detection is carried out again.
Examples 1-3, examples 1, 2, 3 all used the above welding method, and the welding process parameters were different;
welding Process parameters for example 1
Welding Process parameters for example 2
Welding Process parameters for example 3
The method is characterized in that the joints of 124 Hastelloy (Hastelloy-C-276) pipelines are welded by adopting the above embodiments 1-3, the surface quality of the welding seam is detected to be qualified when 100% of the surface quality of the welding seam is achieved, 236 pieces of RT detection pictures are obtained, 5 pieces of RT detection pictures are unqualified, air holes and non-fusion are caused when defects are main, the welding qualification rate is 97.88%, all the welded pipelines and hydraulic tests are qualified, and no leakage occurs. Therefore, the Hastelloy-C-276 pipe is feasible to adopt an argon-electric joint welding process, and experience is accumulated for the future welding work of the pipe made of the same material.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (6)
1. A welding method of an ultra-low carbon type nickel-based hastelloy pipeline is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: pre-welding pretreatment: cutting a groove at the end to be welded of the pipeline, removing oil stains and surface oxidation layers around the groove, and then coating anti-sticking agent on the groove and the area around the groove; wherein the bevel is a V-shaped bevel, the angle of the bevel is 65 +/-5 degrees, the truncated edge is 0.5-1.5mm, and the pairing gap between the bevels is 2-3 mm;
step two: welding: backing welding, hot welding and cover surface filling operation are sequentially carried out;
argon arc backing welding is adopted during backing welding, argon gas is filled on the welding back for protection, small swing welding is adopted during backing welding, the welding current is controlled to be 70-90A, the welding voltage is controlled to be 8-12V, the welding speed is controlled to be 6-7cm/min, and oxides on the surface of a molten pool are thrown to the edge of a welding bead during welding;
the welding current during the heat welding is controlled at 100-140A, the welding voltage is controlled at 10-14V, and the welding speed is controlled at 8-12 cm/min;
manual electric arc welding is adopted when the cover surface is filled, and the interlayer temperature is controlled to be less than or equal to 100 ℃; swinging is carried out during strip conveying, and the swinging amplitude is not more than 2.5 times of the diameter of the welding rod, so that the formation of a welding seam is ensured; cleaning sundries on the surface of the weld bead after each layer of welding is finished;
controlling the welding current to be 80-100A when the cover surface is filled, controlling the welding voltage to be 21-23V, and controlling the welding speed to be 8-12 cm/min;
joints of each welding bead are arranged in a staggered manner in the welding process;
step three: post-welding treatment: after welding, checking the surface molding condition of the welding line, wherein the qualified welding line is a convex welding line and cannot have undercut; when a defect occurs, polishing the defect position until the defect position is polished completely, and performing repair welding by adopting an argon arc welding method, wherein the interlayer temperature is less than or equal to 100 ℃;
and after the repair welding is finished, the surface of the welding line is cleaned up and then the detection is carried out again.
2. The welding method of the ultra-low carbon type nickel-based hastelloy pipe according to claim 1, wherein the welding method comprises the following steps: and removing oil stains on the surface by using acetone or absolute ethyl alcohol when removing the oil stains around the groove in the first step.
3. The welding method of the ultra-low carbon type nickel-based hastelloy pipe according to claim 1, wherein the welding method comprises the following steps: in the first step, the cleaning range of the groove is within 50mm of the two sides and the back of the groove, and the coating range of the anti-adhesion agent is within 100mm of the two sides of the groove.
4. The welding method of the ultra-low carbon type nickel-based hastelloy pipe according to claim 1, wherein the welding method comprises the following steps: and in the second welding step, arc starting and arc quenching at the groove are avoided.
5. The welding method of the ultra-low carbon type nickel-based hastelloy pipe according to claim 1, wherein the welding method comprises the following steps: and in the second step, after each layer of welding is finished when the cover surface is filled, cleaning sundries on the surface of the welding bead by using a grinding wheel or a stainless steel wire wheel.
6. The welding method of the ultra-low carbon type nickel-based hastelloy pipe according to claim 1, wherein the welding method comprises the following steps: the dirt adhesion preventing agent is chalk powder.
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Citations (9)
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|---|---|---|---|---|
| JPH04319093A (en) * | 1991-04-16 | 1992-11-10 | Nippon Oil & Fats Co Ltd | Flux cored wire for nickel alloy 'hastelloy c-276(r)' welding |
| CN103286414A (en) * | 2013-04-27 | 2013-09-11 | 中国石油天然气集团公司 | Welding method of oil gas transmission antisulphour steel pipelines |
| CN103831546A (en) * | 2014-03-25 | 2014-06-04 | 江苏双勤民生冶化设备制造有限公司 | Welding material for Incone1600 alloy |
| CN104759743A (en) * | 2015-04-23 | 2015-07-08 | 中国石油天然气第一建设公司 | Argon arc welding technological method for nickel base alloy tubes |
| CN105750708A (en) * | 2016-04-29 | 2016-07-13 | 东方电气集团东方锅炉股份有限公司 | Welding method for circumferential weld of thick-wall nickel-based alloy header |
| CN106735779A (en) * | 2016-12-31 | 2017-05-31 | 中国化学工程第十四建设有限公司 | A kind of Hastelloy tubing welding method |
| CN108637518A (en) * | 2018-05-16 | 2018-10-12 | 四川石油天然气建设工程有限责任公司 | A kind of welding groove and welding method of petroleum gas composite delivery pipeline |
| CN110560844A (en) * | 2019-09-16 | 2019-12-13 | 中国化学工程第六建设有限公司 | Welding method of nickel-based material pipeline |
| CN111390350A (en) * | 2020-03-26 | 2020-07-10 | 鲁西工业装备有限公司 | Submerged-arc welding method for C-276 composite board |
-
2020
- 2020-11-30 CN CN202011373497.3A patent/CN112620897A/en active Pending
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|---|---|---|---|---|
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| CN106735779A (en) * | 2016-12-31 | 2017-05-31 | 中国化学工程第十四建设有限公司 | A kind of Hastelloy tubing welding method |
| CN108637518A (en) * | 2018-05-16 | 2018-10-12 | 四川石油天然气建设工程有限责任公司 | A kind of welding groove and welding method of petroleum gas composite delivery pipeline |
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| CN111390350A (en) * | 2020-03-26 | 2020-07-10 | 鲁西工业装备有限公司 | Submerged-arc welding method for C-276 composite board |
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