CN113263258B - Welding method and welding device for nickel-based alloy pipe - Google Patents
Welding method and welding device for nickel-based alloy pipe Download PDFInfo
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- CN113263258B CN113263258B CN202110385312.9A CN202110385312A CN113263258B CN 113263258 B CN113263258 B CN 113263258B CN 202110385312 A CN202110385312 A CN 202110385312A CN 113263258 B CN113263258 B CN 113263258B
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/1224—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in vacuum
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
Abstract
The invention relates to the field of welding production of nickel alloy pipes, in particular to a welding method and a welding device of a nickel alloy pipe, which can effectively improve the formation of a welding seam and reduce the incomplete penetration and undercut defects and dimensional deviation of the welding seam, and comprises the following steps: a. preparing before welding: mechanically polishing and removing oxides on the end surface of the nickel-based alloy plate and the surface of the area near the edge to be welded; b. clamping: fixing the pipe to be welded on an inner pipe mould and an outer pipe fixture in a vacuum chamber, and simultaneously ensuring that a welding line is aligned with a light-transmitting glass window of the vacuum chamber; c. vacuumizing; d. setting welding parameters: planning a laser welding path and setting laser welding process parameters; e. welding: laser penetrates through the glass at the top of the vacuum cavity to be welded; f. and (5) inflating, opening the furnace door, taking out the workpiece, and finishing the welding operation. The invention is particularly suitable for the welding production process of the nickel-based alloy pipe.
Description
Technical Field
The invention relates to the field of welding production of nickel alloy pipes, in particular to a welding method and a welding device for a nickel-based alloy pipe.
Background
In industrial production, nickel-based alloy plates are commonly used for manufacturing pipes by a pipe coiling-welding (longitudinal welding seam welding) method. The pipes are widely applied in the fields of energy, chemical industry, metallurgy and the like. For example, the continuous annealing furnace in the metallurgical industry uses nickel alloy to manufacture radiant tubes. Because the weldability of the nickel alloy is poorer than that of common carbon steel, in the production practice, when the argon arc welding method, the plasma welding method, the high-frequency tube welding method and other methods are adopted for welding, the welding process problems, including weld joint cracks, undercut and unfused, shape and size out-of-tolerance and the like, are often encountered. Wherein, the cracks are common problems in the welding of the nickel-based alloy and are related to the material and the welding process; the welding method with low heat input is beneficial to reducing the transverse stress of welding and reducing the width of a two-phase region, thereby being beneficial to avoiding cracks.
Undercuts and unfused are the most common forms of defect. The undercut and the unfused of the nickel-based alloy welding line are represented by uneven welding line concave heads, and the undercut area has deeper pits (the depth of the pits in the welding line of a 4mm plate can reach 1.5 mm), thereby seriously affecting the mechanical property of the welding line. The reason for the formation of undercut and unfused is the poor fluidity of the nickel-based alloy; the nickel-based alloy, especially the nickel-based alloy with high chromium content, has large surface tension of the melt, has poor wettability to the base metal, generally cannot be leveled in a welding line like molten steel, and forms a full and smooth welding line; in the case of poor welding protection, undercutting and lack of fusion are more serious because when the melt flows under the action of arc thrust, gas force and gravity, the surface of the melt is oxidized, the melting point of the formed oxide (e.g., chromium oxide) is high, the melt flow is hindered, and the base material under the melt is exposed on the surface and oxidized, further deteriorating the wettability of the melt to the base material, even being completely unwettable. The prevalence of undercutting and unfused defects has led to the frequent need for repair welding of nickel-base alloy welded tubes. Repair welding operations present a number of problems: the pipe diameter is small, and the repair welding in the pipe is very difficult on the inner surface of the welding line; extra material consumption (the original welding method does not need welding materials, and repair welding needs welding wires) and manpower; the surface of the welding seam of the pipe is raised, stress concentration exists at the raised part, the mechanical property of the welding seam is influenced, the subsequent pipe bending process is influenced, the pipe bending die is required to be grooved and avoided, and if the pipe is polished, the polishing in the pipe is difficult. The reasons for the shape and size out-of-tolerance include welding stress and distortion, in addition to the welding jig and fixture arrangement. The shape and size out-of-tolerance brings great difficulty to the subsequent assembly welding of the pipe.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a welding method and a welding device for nickel-based alloy pipes, which can effectively improve the formation of welding seams, reduce the defects of unfused and undercut and reduce the size deviation.
The technical scheme adopted by the invention for solving the technical problems is as follows: the welding method of the nickel-based alloy pipe comprises the following steps: a. preparing before welding: mechanically polishing and removing oxides on the end face of the nickel-based alloy plate and the surface of the area near the edge to be welded, coiling the pipe to obtain the pipe to be welded, and wiping and cleaning the area near the welding seam of the pipe by adopting an organic solvent; b. clamping: fixing the pipe to be welded on an inner pipe mould and an outer pipe fixture in a vacuum chamber, and simultaneously ensuring that a welding line is aligned with a light-transmitting glass window of the vacuum chamber; c. vacuumizing: closing and sealing the vacuum chamber, then vacuumizing to low vacuum, introducing high-purity argon to micro positive pressure, closing the argon introducing valve, then opening the extraction valve, vacuumizing to low vacuum, repeating the argon introducing and air extracting operations once again to obtain a low vacuum environment, and keeping the extraction valve open and the vacuum pump in a working state; d. setting welding parameters: planning a laser welding path and setting laser welding process parameters; e. welding: welding the laser through the glass at the top of the vacuum cavity; f. and (5) inflating, opening the furnace door, taking the workpiece and finishing the welding operation.
Further, in the step a, the mechanical polishing process adopts an angle grinder, an 80-mesh impeller or a stainless steel wire wheel and a manual polishing mode, and the polishing areas comprise the areas within 10mm of the end surface of the nickel-based alloy plate and the areas within 10mm of the front and back surfaces of the plate close to the two sides of the welding line.
Furthermore, in the step a, after the pipe is coiled to form the pipe to be welded, the gap between two surfaces to be welded of the welding line is less than or equal to 0.2 mm.
Further, in the step a, the organic solvent is absolute ethyl alcohol or acetone.
Further, in the step c, the low vacuum is less than 10Pa, and the micro positive pressure is 0.02-0.08 MPa.
Furthermore, the laser power is more than 1.5kW, and the welding speed is more than or equal to 0.5 m/min.
Furthermore, the focal position of the laser is-5 mm to +5mm away from the outer surface of the pipe to be welded.
Further, the welding device for the nickel-based alloy pipe comprises a pipe to be welded and a vacuum chamber, wherein the wall surface of the vacuum chamber is provided with a light-transmitting glass window, the pipe to be welded is arranged in the vacuum chamber, an outer pipe fixture is arranged on the periphery of the pipe to be welded, an inner pipe mould is arranged on the inner wall of the pipe to be welded, and a welding seam of the pipe to be welded faces the light-transmitting glass window.
Further, the vacuum chamber is provided with an exhaust tube.
Further, the light-transmitting glass window is in a long strip shape and is arranged along the extending direction of the welding seam.
The invention has the beneficial effects that: the invention effectively overcomes the defects that the welding quality of the existing welding method is unstable, the defects are easy to appear, repair welding is often needed, and repair welding of the small-diameter pipe is difficult, and the welding quality of the welding seam is good and stable. In addition, the vacuum pumping can be realized by adopting cheaper equipment, wherein the equipment cost is lower, and the production efficiency is higher. The invention is particularly suitable for the welding process of the nickel-based alloy pipe.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a top view of fig. 1.
Labeled as: the welding method comprises the steps of a pipe 1 to be welded, a welding seam 11, an outer pipe clamp 2, an inner pipe mould 3, a vacuum chamber 4, a light-transmitting glass window 5 and an exhaust pipe 6.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The welding method of the nickel base alloy pipe shown in fig. 1 and 2 comprises the following steps: a. preparing before welding: mechanically polishing and removing oxides on the end face of the nickel-based alloy plate and the surface of the area near the edge to be welded, coiling the pipe to obtain the pipe 1 to be welded, and wiping and cleaning the area near the welding seam of the pipe by adopting an organic solvent; b. clamping: fixing the pipe 1 to be welded on an inner clamping fixture 3 and an outer clamping fixture 2 in a vacuum chamber 4, and simultaneously ensuring that a welding line 11 is aligned with a light-transmitting glass window 5 of the vacuum chamber 4; c. vacuumizing: closing and sealing the vacuum chamber 4, then vacuumizing to low vacuum, introducing high-purity argon to micro positive pressure, closing the argon introducing valve, then opening the extraction valve, vacuumizing to low vacuum, repeating the argon introducing and air extracting operations once again to obtain a low vacuum environment, and keeping the extraction valve open and the vacuum pump in a working state; d. setting welding parameters: planning a laser welding path and setting laser welding process parameters; e. welding: welding the laser through the glass at the top of the vacuum cavity; f. and (5) inflating, opening the furnace door, taking out the workpiece, and finishing the welding operation.
The welding method of the invention eliminates undercut and incomplete fusion in the welding process and has the main principles that: (1) polishing and cleaning before welding, and placing the workpiece in a vacuum environment to avoid the phenomenon that a melt does not wet a base metal due to the oxidation of the melt and the base metal in a welding seam in the welding process; (2) the weld seam of vacuum laser welding, especially adopt the high power density laser, vacuum laser welding weld seam of the keyhole welding mode, the weld seam width is not merely narrower than the high frequency welded pipe, argon arc welding, plasma welding weld seam, also narrower than the laser welding weld seam of argon shield. The melt behind the small hole (commonly referred to as a "keyhole") formed by the laser applied to the material is predominantly subjected to surface tension and vapor pressure in the hole, with negligible gravitational effects. Because the welding seam is narrow and has large surface tension, the siphon action of the welding seam on the melt is strong, the melt is sucked into the welding seam to be rapidly solidified after being pushed to the back wall of the keyhole under the action of steam pressure, and the melt flows without the action of arc thrust, protective gas blowing force and gravity, so that the welding seam is well formed, no undercut and fusion exist, and the surface of the welding seam in the pipe is small in protrusion. The method for welding the pipe is also beneficial to reducing the cracks and the shape and size deviation of the welding line, and the reasons are as follows: the vacuum laser welding has narrow welding seam, narrow two-phase area and narrow heat affected zone, and small transverse shrinkage stress caused by small heat input, so that solidification crack, liquefaction crack and plastic loss crack are difficult to occur. Also, the welding strain is small due to the small heat input, and the deviation of the shape and size of the welded pipe is small.
In order to obtain better polishing effect on the surface oxide of the end surface of the nickel-based alloy plate and the area near the edge to be welded in the actual welding operation, the scheme is preferably as follows: in the step a, the mechanical polishing process adopts an angle grinder, an 80-mesh impeller or a stainless steel wire wheel and a manual polishing mode, and the polishing area comprises the area within 10mm of the end face of the nickel-based alloy plate and the area within 10mm of the front and back faces of the plate close to the two sides of the welding line. In addition, in order to obtain better weld quality, it is preferable that such parameters are defined: in the step a, after the pipe 1 to be welded is formed by coiling the pipe, the gap between two surfaces to be welded of the welding line 11 is less than or equal to 0.2 mm. In order to obtain better cleaning effect, the organic solvent is preferably absolute ethyl alcohol or acetone.
In step c, the low vacuum is preferably 10Pa or less, and the micro-positive pressure is preferably 0.02 to 0.08 MPa.
For welding, the laser power is preferably 1.5kW or more, and the welding speed is 0.5m/min or more, wherein the fiber laser is preferably used, and the focal point of the laser is preferably-5 mm to +5mm from the outer surface of the pipe 1 to be welded.
During specific welding, the welding device comprises a pipe 1 to be welded and a vacuum chamber 4 with a light-transmitting glass window 5 arranged on the wall surface, wherein the pipe 1 to be welded is arranged in the vacuum chamber 4, an outer pipe fixture 2 is arranged on the periphery of the pipe 1 to be welded, an inner pipe clamping fixture 3 is arranged on the inner wall of the pipe 1 to be welded, and a welding seam 11 of the pipe 1 to be welded faces the light-transmitting glass window 5.
In order to facilitate evacuation of the vacuum chamber 4, the vacuum chamber 4 is preferably provided with an evacuation tube 6. In practical arrangement, the transparent glass window 5 is preferably in a long strip shape, and the transparent glass window 5 is arranged along the extending direction of the welding seam 11. As shown in fig. 2, so as to facilitate the welding of the laser along the extending direction of the welding seam, it is preferable that the starting point of the movement of the welding robot is set to 50mm before the actual starting point of the welding seam and the ending point of the movement of the robot is set to 50mm after the actual ending point of the welding seam when the welding path is set according to the present invention.
Examples
Example 1
The Inconel 601 nickel alloy pipe manufactured by the method has the advantages of 4mm of wall thickness, 185mm of outer diameter and 1500mm of length. The manufacturing process comprises the following procedures:
(1) preparing before welding: polishing the surface oxides of the end face of the alloy plate and the area near the to-be-welded edge by using an angle grinder and a stainless steel wire wheel, rolling the tube, and wiping the area 20mm near the welding line of the tube by using absolute ethyl alcohol to remove oil stains;
(2) clamping: the pipe to be welded is fixed on a welding mould and a fixture in a vacuum chamber, so that the two surfaces to be welded are tightly attached, and the gap is less than 0.1 mm. Meanwhile, ensuring that the welding line is aligned to the silicon dioxide glass window at the top of the vacuum chamber;
(3) vacuumizing: closing and sealing the vacuum chamber, adopting a mechanical vacuum pump, vacuumizing to below 10Pa, closing the extraction valve, introducing high-purity argon to the micro-positive pressure of 0.02MPa, closing the argon introducing valve, opening the extraction valve, vacuumizing to below 10Pa, and repeating the argon introducing-air extracting operation again to obtain a low-vacuum environment with the vacuum pressure of less than 10 Pa. Keeping the air extraction valve open and the vacuum pump in a working state;
(4) setting welding parameters: the power of the fiber laser is 1.5kW, the welding speed is 3m/min, and the defocusing amount is +3 mm. And (3) teaching the laser welding robot and planning a laser welding path. The starting point of the robot movement is set to be 50mm before the actual starting point of the welding line, and the terminal point of the robot movement is set to be 50mm after the actual terminal point of the welding line, so that the problem of unstable welding speed of the acceleration section and the deceleration section of the robot is avoided;
(5) welding the laser through the glass at the top of the vacuum cavity;
(6) and (4) inflating, opening a door of the vacuum chamber, and taking the pipe out of the welding fixture.
The implementation effect is as follows: the manufactured Inconel 601 nickel alloy pipe has the advantages of bright weld surface, no oxidation color, no undercut, no fusion, no crack, no shape and size out-of-tolerance and defect, small surplus height of the front surface and the back surface and accordance with the design requirement.
Example 2
The Inconel 601 nickel alloy pipe manufactured by the method has the wall thickness of 3mm, the outer diameter of about 183mm and the length of 1500 mm. The manufacturing process comprises the following procedures:
(1) preparing before welding: polishing the surface oxides of the end face of the alloy plate and the area near the to-be-welded edge by using an angle grinder and a stainless steel wire wheel, rolling the tube, and wiping the area 20mm near the welding line of the tube by using absolute ethyl alcohol to remove oil stains;
(2) clamping: the pipe to be welded is fixed on a welding mould and a fixture in a vacuum chamber, so that the two surfaces to be welded are tightly attached, and the gap is less than 0.1 mm. Meanwhile, ensuring that the welding line is aligned to the silicon dioxide glass window at the top of the vacuum chamber;
(3) vacuumizing: closing and sealing the vacuum chamber, adopting a mechanical vacuum pump, vacuumizing to below 10Pa, closing the extraction valve, introducing high-purity argon to the micro-positive pressure of 0.02MPa, closing the argon introducing valve, opening the extraction valve, vacuumizing to below 10Pa, and repeating the argon introducing-air extracting operation again to obtain a low-vacuum environment with the vacuum pressure of less than 10 Pa. Keeping the air extraction valve open and the vacuum pump in a working state;
(4) setting welding parameters: the power of the fiber laser is 1.5kW, the welding speed is 4m/min, and the defocusing amount is +3 mm. And (5) teaching the laser welding robot and planning a laser welding path. The starting point of the robot movement is set to be 50mm before the actual starting point of the welding line, and the terminal point of the robot movement is set to be 50mm after the actual terminal point of the welding line, so that the problem of unstable welding speed of the acceleration section and the deceleration section of the robot is avoided;
(5) welding the laser through the glass at the top of the vacuum cavity;
(6) and (4) inflating, opening a door of the vacuum chamber, and taking the pipe out of the welding fixture.
The implementation effect is as follows: the manufactured Inconel 601 nickel alloy pipe has the advantages of bright weld surface, no oxidation color, no undercut, no fusion, no crack, no shape and size out-of-tolerance and defect, small surplus height of the front surface and the back surface and accordance with the design requirement.
Example 3
The Inconel 625 nickel alloy pipe manufactured by the method provided by the invention has the advantages of 5mm of wall thickness, about 187mm of outer diameter and 1000mm of length. The manufacturing process comprises the following procedures:
(1) preparing before welding: polishing the surface oxides of the end face of the alloy plate and the area near the to-be-welded edge by using an angle grinder and a stainless steel wire wheel, rolling the tube, and wiping the area 20mm near the welding line of the tube by using absolute ethyl alcohol to remove oil stains;
(2) clamping: the pipe to be welded is fixed on a welding mould and a fixture in a vacuum chamber, so that the two surfaces to be welded are tightly attached, and the gap is less than 0.1 mm. Meanwhile, ensuring that the welding line is aligned to the silicon dioxide glass window at the top of the vacuum chamber;
(3) vacuumizing: closing and sealing the vacuum chamber, vacuumizing to below 10Pa by adopting a mechanical vacuum pump, closing an air extraction valve, introducing high-purity argon to the micro-positive pressure of 0.02MPa, closing an argon introducing valve, opening the air extraction valve, vacuumizing to below 10Pa, and repeating the argon introducing-air extracting operation again to obtain a low-vacuum environment, wherein the vacuum pressure is less than 10 Pa. Keeping the air extraction valve open and the vacuum pump in a working state;
(4) setting welding parameters: the power of the fiber laser is 2.5kW, the welding speed is 3m/min, and the defocusing amount is-2 mm. And (5) teaching the laser welding robot and planning a laser welding path. The starting point of the robot movement is set to be 50mm before the actual starting point of the welding line, and the terminal point of the robot movement is set to be 50mm after the actual terminal point of the welding line, so that the problem of unstable welding speed of the acceleration section and the deceleration section of the robot is avoided;
(5) welding the laser through the glass at the top of the vacuum cavity;
(6) and (4) inflating, opening a door of the vacuum chamber, and taking the pipe out of the welding fixture.
The implementation effect is as follows: the manufactured Inconel 625 nickel alloy pipe has the advantages of bright weld surface, no oxidation color, no undercut, no fusion, no crack, no shape and size out-of-tolerance and small surplus height of the front surface and the back surface, and meets the design requirements.
Claims (6)
1. The welding manufacturing method of the nickel-based alloy pipe is characterized by comprising the following steps:
a. preparing before welding: mechanically polishing to remove surface oxides on the end face of the nickel-based alloy plate and the area near the edge to be welded, coiling the pipe to obtain the pipe (1) to be welded, wiping and cleaning the area near the welding seam of the pipe by adopting an organic solvent, wherein the mechanical polishing process comprises the steps of adopting an angle grinder, an 80-mesh impeller or a stainless steel wire wheel and a manual polishing mode, the polishing area comprises the areas within 10mm of the end face of the nickel-based alloy plate and the front and back faces of the plate close to the two sides of the welding seam, and after the pipe to be welded (1) is formed by coiling the pipe, the gap between the two surfaces to be welded of the welding seam (11) is less than or equal to 0.2 mm;
b. clamping: fixing the pipe (1) to be welded on an inner pipe clamping fixture (3) and an outer pipe clamping fixture (2) in a vacuum chamber (4), and simultaneously ensuring that a welding seam (11) is aligned with a light-transmitting glass window (5) of the vacuum chamber (4);
c. vacuumizing: closing and sealing the vacuum chamber (4), then vacuumizing to low vacuum, introducing high-purity argon to micro positive pressure, closing the argon introducing valve, then opening the extraction valve, vacuumizing to low vacuum, repeating the argon introducing and air extracting operations once again to obtain a low vacuum environment, and keeping the extraction valve open and the vacuum pump in a working state;
d. setting welding parameters: planning a laser welding path and setting laser welding process parameters;
e. welding: the laser penetrates through the glass at the top of the vacuum cavity to be welded, wherein the laser power is more than 1.5kW, the welding speed is more than or equal to 0.5m/min, and the focal point position of the laser is-5 mm to +5mm away from the outer surface of the pipe (1) to be welded;
f. and (5) inflating, opening the furnace door, taking the workpiece and finishing the welding operation.
2. The welding method for producing a nickel-base alloy pipe according to claim 1, wherein: in the step a, the organic solvent is absolute ethyl alcohol or acetone.
3. The welding method for producing a nickel-base alloy pipe according to claim 1, wherein: in the step c, the low vacuum is below 10Pa, and the micro-positive pressure is 0.02-0.08 MPa.
4. Welding device for nickel base alloy pipes for carrying out the welding manufacturing method of nickel base alloy pipes according to claim 1, characterized in that: the welding device comprises a vacuum chamber (4) with a light-transmitting glass window (5) arranged on the wall surface, wherein a pipe (1) to be welded is arranged in the vacuum chamber (4), an outer pipe fixture (2) is arranged on the periphery of the pipe (1) to be welded, an inner pipe mould (3) is arranged on the inner wall of the pipe (1) to be welded, and a welding seam (11) of the pipe (1) to be welded faces the light-transmitting glass window (5) in the direction.
5. The welding apparatus for nickel-base alloy pipes according to claim 4, wherein: the vacuum chamber (4) is provided with an exhaust tube (6).
6. The welding apparatus for nickel-base alloy piping materials according to claim 4, wherein: the light-transmitting glass window (5) is long and is arranged along the extending direction of the welding seam (11).
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