CN110773839A - Welding process method for preventing repair welding cracks of nickel-based alloy bent pipe - Google Patents
Welding process method for preventing repair welding cracks of nickel-based alloy bent pipe Download PDFInfo
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- CN110773839A CN110773839A CN201911104961.6A CN201911104961A CN110773839A CN 110773839 A CN110773839 A CN 110773839A CN 201911104961 A CN201911104961 A CN 201911104961A CN 110773839 A CN110773839 A CN 110773839A
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- welding
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- based alloy
- bent pipe
- surfacing
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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
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
- B23K9/046—Built-up welding on three-dimensional surfaces on surfaces of revolution
- B23K9/048—Built-up welding on three-dimensional surfaces on surfaces of revolution on cylindrical surfaces
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
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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 discloses a welding process method for avoiding repair welding cracks of a nickel-based alloy bent pipe, which is characterized by comprising the following steps of: 1) removing defects of the casting by using carbon arc gas, polishing by using a grinding wheel, and cleaning the surface; 2) carrying out PT inspection on the cleaned surface to confirm that the inspection meets the requirements; 3) firstly, surfacing a transition layer on a bevel face of a defective part; 4) inspecting the surfacing, wherein the thickness of the surfacing is 3-4 mm; 5) after the surfacing layer is qualified, putting the whole product into a heating furnace for heating until the temperature is 180-220 ℃, and preserving heat for 2-3 hours; 6) filling and welding; 7) and polishing the welding seam after filling and welding, and checking that the welding surface of the product meets the requirements, thereby completing repair welding of the defects of the nickel-based alloy bent pipe. The method can avoid the crack defect phenomenon of the nickel-based alloy bent pipe defect in the repair welding process.
Description
Technical Field
The invention relates to the technical field of welding production, in particular to a welding process method for avoiding repair welding cracks of a nickel-based alloy bent pipe.
Background
Because the nickel-based alloy casting is sensitive to hot cracks, the defect repairing work is generally finished by filling repair welding at one time by adopting a method of non-preheating and low inter-pass temperature, although the hot cracks between welding beads and the casting are solved by the process, when the repair welding of large defects is met, the welding stress is large, the casting material (such as A494 CW12MW) is very brittle, the standard elongation is 4 percent, so the weld line after welding is easy to crack brittle under the action of the welding stress, the defect repairing failure is caused, and the rejection rate is extremely high. Therefore, the bent pipe made of the nickel-based alloy material often has cracks in the repair welding process, which not only greatly increases the production cost, but also causes huge material waste.
Disclosure of Invention
In order to effectively solve the problem that the nickel-based alloy bent pipe has cracks in the repair welding process, the invention provides a welding process method for avoiding the repair welding cracks of the nickel-based alloy bent pipe.
In order to achieve the purpose, the invention provides the following technical scheme:
a welding process method for avoiding repair welding cracks of a nickel-based alloy bent pipe comprises the following steps:
1) removing defects of the casting by using carbon arc gas, polishing by using a grinding wheel, and cleaning the surface;
2) carrying out PT inspection on the cleaned surface to confirm that the inspection meets the requirements;
3) firstly, surfacing a transition layer on the bevel face of the defect part, adopting shielded metal arc welding, and adopting the power polarity: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4, diameter 3.2 mm; current selection: I-80-110A; voltage selection: U-22-26V, welding speed: 10-15 cm/min; the position is always kept in a flat welding position in the surfacing process, and the temperature between channels is lower than 60 ℃;
4) inspecting the surfacing, wherein the thickness of the surfacing is 3-4 mm;
5) after the surfacing layer is qualified, putting the whole product into a heating furnace for heating until the temperature is 180-220 ℃, and preserving heat for 2-3 hours;
6) filling and welding: adopting shielded metal arc welding, and the polarity of a power supply is as follows: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4 with the diameter of 4 mm; current selection: I-110-140A; voltage selection: U-24-30V, welding speed: 14-18 cm/min;
7) and polishing the welding seam after filling and welding, and checking that the welding surface of the product meets the requirements, thereby completing repair welding of the defects of the nickel-based alloy bent pipe.
Preferably, the preheating temperature is kept to be not lower than 150 ℃ in the filling welding process, and flame heating can be adopted for maintaining the temperature; the position is always kept in the flat welding position in the filling welding process.
Preferably, 1 or 2 transition layers are deposited on the bevel of the defect.
Preferably, the thickness of the transition layer in the bead-face welding at the defect site is 3-4 mm.
Preferably, the thickness of the transition layer in the bead-face weld at the defect site is 3 mm.
Preferably, in the step (5), the whole product is put into a heating furnace for heating, the temperature is raised to 200 ℃, and the temperature is kept for 3 hours.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, by utilizing the characteristic that the filling material is insensitive to thermal cracks and the principle of heating stress relief, 1-2 transition layers are firstly built up on the surface of the defect without preheating, so that the occurrence of thermal cracks on the nickel-based alloy bent pipe is avoided; then preheating welding filling is carried out, and the casting body does not experience high temperature due to the isolation of a transition layer in the filling process, so that hot cracks are avoided; the welding stress is greatly reduced by the preheat welding, so that the stress of a welding joint is greatly reduced, the tensile stress borne by a casting is greatly reduced, the crack generated by a base metal fusion line is avoided, and the problem of the crack generated in the repair welding of the nickel-based alloy bent pipe is effectively solved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a welding process method for avoiding repair welding cracks of a nickel-based alloy bent pipe comprises the following steps:
1) removing defects of the casting by using carbon arc gas, polishing by using a grinding wheel, and cleaning the surface;
2) carrying out PT inspection on the cleaned surface to confirm that the inspection meets the requirements;
3) firstly, surfacing a transition layer on the bevel face of the defect part, adopting shielded metal arc welding, and adopting the power polarity: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4, diameter 3.2 mm; current selection: I-80-110A; voltage selection: U-22-26V, welding speed: 10-15 cm/min; the position is always kept in a flat welding position in the surfacing process, and the temperature between channels is lower than 60 ℃;
4) inspecting the surfacing, wherein the thickness of the surfacing is 3-4 mm;
5) after the surfacing layer is qualified, putting the whole product into a heating furnace for heating until the temperature is 180-220 ℃, and preserving heat for 2-3 hours;
6) filling and welding: adopting shielded metal arc welding, and the polarity of a power supply is as follows: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4 with the diameter of 4 mm; current selection: I-110-140A; voltage selection: U-24-30V, welding speed: 14-18 cm/min, keeping the preheating temperature not lower than 150 ℃ in the filling welding process, and adopting flame heating to maintain the temperature;
7) and polishing the welding seam after filling and welding, and checking that the welding surface of the product meets the requirements, thereby completing repair welding of the defects of the nickel-based alloy bent pipe.
Example two:
a welding process method for avoiding repair welding cracks of a nickel-based alloy bent pipe comprises the following steps:
1) removing defects of the casting by using carbon arc gas, polishing by using a grinding wheel, and cleaning the surface;
2) carrying out PT inspection on the cleaned surface to confirm that the inspection meets the requirements;
3) firstly, surfacing a transition layer on the bevel face of the defect part, adopting shielded metal arc welding, and adopting the power polarity: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4, diameter 3.2 mm; current selection: I-80-110A; voltage selection: U-22-26V, welding speed: 10-15 cm/min; the position is always kept in a flat welding position in the surfacing process, and the temperature between channels is lower than 60 ℃;
4) inspecting the surfacing, wherein the thickness of the surfacing is 3-4 mm;
5) after the surfacing layer is qualified, putting the whole product into a heating furnace for heating until the temperature is 180-220 ℃, and preserving heat for 2-3 hours;
6) filling and welding: adopting shielded metal arc welding, and the polarity of a power supply is as follows: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4 with the diameter of 4 mm; current selection: I-110-140A; voltage selection: U-24-30V, welding speed: 14-18 cm/min; the position is always kept in a flat welding position in the filling welding process;
7) and polishing the welding seam after filling and welding, and checking that the welding surface of the product meets the requirements, thereby completing repair welding of the defects of the nickel-based alloy bent pipe.
Example three:
a welding process method for avoiding repair welding cracks of a nickel-based alloy bent pipe comprises the following steps:
1) removing defects of the casting by using carbon arc gas, polishing by using a grinding wheel, and cleaning the surface;
2) carrying out PT inspection on the cleaned surface to confirm that the inspection meets the requirements;
3) firstly, surfacing a transition layer on the slope surface of the defect part, wherein the number of the surfacing transition layers can be 1 or 2, the thickness of the transition layer is 3-4 mm, and the electrode arc welding is adopted, and the polarity of a power supply is as follows: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4, diameter 3.2 mm; current selection: I-80-110A; voltage selection: U-22-26V, welding speed: 10-15 cm/min; the position is always kept in a flat welding position in the surfacing process, and the temperature between channels is lower than 60 ℃;
4) inspecting the surfacing, wherein the thickness of the surfacing is 3-4 mm;
5) after the surfacing layer is qualified, putting the whole product into a heating furnace for heating until the temperature is 180-220 ℃, and preserving heat for 2-3 hours;
6) filling and welding: adopting shielded metal arc welding, and the polarity of a power supply is as follows: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4 with the diameter of 4 mm; current selection: I-110-140A; voltage selection: U-24-30V, welding speed: 14-18 cm/min; the position is always kept in a flat welding position in the filling welding process;
7) and polishing the welding seam after filling and welding, and checking that the welding surface of the product meets the requirements, thereby completing repair welding of the defects of the nickel-based alloy bent pipe.
Example four:
a welding process method for avoiding repair welding cracks of a nickel-based alloy bent pipe comprises the following steps:
1) removing defects of the casting by using carbon arc gas, polishing by using a grinding wheel, and cleaning the surface;
2) carrying out PT inspection on the cleaned surface to confirm that the inspection meets the requirements;
3) firstly, surfacing a transition layer on the bevel face of the defect part, wherein the number of the surfacing transition layers can be 1 or 2, the thickness of the transition layer is 3mm, and the electrode arc welding is adopted, and the polarity of a power supply is as follows: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4, diameter 3.2 mm; current selection: I-80-110A; voltage selection: U-22-26V, welding speed: 10-15 cm/min; the position is always kept in a flat welding position in the surfacing process, and the temperature between channels is lower than 60 ℃;
4) inspecting the surfacing, wherein the thickness of the surfacing is 3-4 mm;
5) after the surfacing layer is qualified, putting the whole product into a heating furnace for heating until the temperature is 200 ℃, and preserving heat for 3 hours;
6) filling and welding: adopting shielded metal arc welding, and the polarity of a power supply is as follows: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4 with the diameter of 4 mm; current selection: I-110-140A; voltage selection: U-24-30V, welding speed: 14-18 cm/min; the position is always kept in a flat welding position in the filling welding process, the preheating temperature is kept to be not lower than 150 ℃, and flame heating can be adopted to maintain the temperature;
7) and polishing the welding seam after filling and welding, and checking that the welding surface of the product meets the requirements, thereby completing repair welding of the defects of the nickel-based alloy bent pipe.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (6)
1. A welding process method for avoiding repair welding cracks of a nickel-based alloy bent pipe is characterized by comprising the following steps:
1) removing defects of the casting by using carbon arc gas, polishing by using a grinding wheel, and cleaning the surface;
2) carrying out PT inspection on the cleaned surface to confirm that the inspection meets the requirements;
3) firstly, surfacing a transition layer on the bevel face of the defect part, adopting shielded metal arc welding, and adopting the power polarity: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4, diameter 3.2 mm; current selection: I-80-110A; voltage selection: U-22-26V, welding speed: 10-15 cm/min; the position is always kept in a flat welding position in the surfacing process, and the temperature between channels is lower than 60 ℃;
4) inspecting the surfacing, wherein the thickness of the surfacing is 3-4 mm;
5) after the surfacing layer is qualified, putting the whole product into a heating furnace for heating until the temperature is 180-220 ℃, and preserving heat for 2-3 hours;
6) filling and welding: adopting shielded metal arc welding, and the polarity of a power supply is as follows: direct current is reversely connected; selecting a welding rod: SFA5.11ENiCrMo-4, diameter 4 mm; current selection: I-110-140A; voltage selection: U-24-30V, welding speed: 14-18 cm/min;
7) and polishing the welding seam after filling and welding, and checking that the welding surface of the product meets the requirements, thereby completing repair welding of the defects of the nickel-based alloy bent pipe.
2. The welding process method for avoiding the repair welding cracks of the nickel-based alloy bent pipe according to claim 1, is characterized in that: the preheating temperature is kept to be not lower than 150 ℃ in the filling welding process, and flame heating can be adopted to maintain the temperature; the position is always kept in the flat welding position in the filling welding process.
3. The welding process method for avoiding the repair welding cracks of the nickel-based alloy bent pipe according to claim 1, is characterized in that: and (3) overlaying 1 or 2 transition layers on the bevel face of the defect part.
4. The welding process method for avoiding the repair welding cracks of the nickel-based alloy bent pipe according to claim 3, is characterized in that: the thickness of the transition layer of the bevel face overlaying at the defect part is 3-4 mm.
5. The welding process method for avoiding the repair welding cracks of the nickel-based alloy bent pipe according to claim 4, is characterized in that: the thickness of the transition layer of the bevel face overlaying at the defect part is 3 mm.
6. The welding process method for avoiding the repair welding cracks of the nickel-based alloy bent pipe according to claim 4, is characterized in that: in the step (5), the whole product is put into a heating furnace to be heated to the temperature of 200 ℃ and the temperature is kept for 3 hours.
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| CN201911104961.6A CN110773839A (en) | 2019-11-13 | 2019-11-13 | Welding process method for preventing repair welding cracks of nickel-based alloy bent pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112008172A (en) * | 2020-08-14 | 2020-12-01 | 山东蓬翔汽车有限公司 | Method for repairing superficial defects of iron casting |
| CN113478054A (en) * | 2021-07-20 | 2021-10-08 | 新疆大全新能源股份有限公司 | Welding method of nickel-based alloy |
| CN115041915A (en) * | 2022-06-27 | 2022-09-13 | 广东鸿图科技股份有限公司 | Repairing method of metal 3D printing mold and server |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112008172A (en) * | 2020-08-14 | 2020-12-01 | 山东蓬翔汽车有限公司 | Method for repairing superficial defects of iron casting |
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| CN115041915A (en) * | 2022-06-27 | 2022-09-13 | 广东鸿图科技股份有限公司 | Repairing method of metal 3D printing mold and server |
| CN115041915B (en) * | 2022-06-27 | 2024-02-06 | 广东鸿图科技股份有限公司 | Repairing method and server for metal 3D printing mold |
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