CN112872637A - Device and method for welding sealing cylinder of driving motor - Google Patents
Device and method for welding sealing cylinder of driving motor Download PDFInfo
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- CN112872637A CN112872637A CN202011581384.2A CN202011581384A CN112872637A CN 112872637 A CN112872637 A CN 112872637A CN 202011581384 A CN202011581384 A CN 202011581384A CN 112872637 A CN112872637 A CN 112872637A
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
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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
- B23K2101/12—Vessels
Abstract
The invention belongs to the technical field of sealing cylinders of driving motors, and particularly relates to a device and a method for welding the sealing cylinders of the driving motors. The invention can effectively reduce the welding defects in the dissimilar stainless steel welding seam, ensure the sealing property of the sealing cylinder of the driving motor, and ensure that the leakage quantity of helium leakage detection does not exceed 6.7 multiplied by 10‑7m3X Pa/s; meanwhile, the bending deformation of the sealing cylinder of the driving motor is effectively reduced, and the deflection after welding is not more than 1.5 mm.
Description
Technical Field
The invention belongs to the technical field of sealing barrels of driving motors, and particularly relates to a device and a method for welding the sealing barrels of the driving motors.
Background
At present, a CRDM driving motor for a demonstration fast reactor developed in China is a novel composite motor, and can be matched with a driving mechanism to realize the lifting, descending and emergency shutdown of a nuclear reactor control rod assembly. The CRDM driving motor comprises a plurality of rotors, a sealing cylinder is arranged between the rotors and the stators, and the sealing cylinder is not only a part of a motor magnetic circuit, but also a component of a loop pressure boundary of the reactor and plays a role in isolating gas inside and outside the reactor. The sealing cylinder is formed by butt welding five sections of dissimilar stainless steel cylinders, 4 full penetration circumferential welds of the cylinder body have the length-diameter ratio of 8-9, and the length of the sealing cylinder is about (800-. The design requires that the integral post-welding deflection of the sealing cylinder is not more than 2mm, and the welding deformation control difficulty is very high. Meanwhile, the sealing cylinder is a pressure boundary, the sealing performance of the sealing cylinder needs to be ensured, a helium leak detection test is required to be carried out after welding, and the leakage amount cannot exceed 6.7 multiplied by 10-7m3X Pa/s. Due to the fact that the different stainless steels (martensitic stainless steel-austenitic stainless steel) have large difference in chemical components and thermal expansion coefficients, cracks and other defects are prone to occurring in the welding process, and therefore the difficulty in guaranteeing the sealing performance of the welding seam of the sealing cylinder is increased.
Disclosure of Invention
The invention aims to provide a welding device and a welding method capable of realizing low deformation and high sealing performance of a dissimilar stainless steel sealing cylinder of a driving motor, so that the deflection of the sealing cylinder after welding is not more than 2mm, and the leakage rate is less than 6.7 multiplied by 10-7m3×Pa/s。
In order to achieve the above purpose, the technical scheme adopted by the invention is a device for welding a sealing cylinder of a driving motor, wherein the sealing cylinder of the driving motor is formed by coaxially connecting a plurality of segments of sealing cylinders in series, and comprises a cylindrical supporting core rod, and the supporting core rod can be arranged in the sealing cylinders in a penetrating manner, so that the sealing cylinders of the driving motor to be welded are coaxially connected in series and fixed to form the sealing cylinder of the driving motor to be welded.
Furthermore, one end of the supporting core rod is a clamping end, and a flange for limiting the movement of the sub sealing cylinder is arranged; the other end of the supporting core rod is a fastening end and is used for pressing and fixing the sub sealing cylinders which are connected in series.
Furthermore, the fastening end is provided with a thread structure, and the sub sealing cylinders connected in series are pressed and fixed on the supporting core rod through nuts and gaskets.
Furthermore, a plurality of annular supporting tables are arranged on the supporting core rod, and all the supporting tables are coaxial and have the same outer diameter; welding seams are arranged at the connecting positions of two adjacent sub sealing cylinders, the supporting tables are positioned below the welding seams, and when all the sub sealing cylinders are sleeved on the outer sides of the supporting core rods and are pressed and fixed together, the supporting tables can support the welding seams; the support width of the support table exceeds the width of the weld.
Further, the supporting core rod, the nut and the washer are made of stainless steel or carbon steel.
In order to achieve the above object, the present invention also discloses a method for welding a sealing cylinder of a driving motor, which is used for the device for welding a sealing cylinder of a driving motor, and comprises the following steps:
step S1, the sub sealing cylinders of the driving motor sealing cylinder comprise a first sub sealing cylinder, a second sub sealing cylinder, a third sub sealing cylinder, a fourth sub sealing cylinder and a fifth sub sealing cylinder which are coaxially connected in series in sequence, the first sub sealing cylinder, the third sub sealing cylinder and the fifth sub sealing cylinder are made of austenitic stainless steel, the second sub sealing cylinder and the fourth sub sealing cylinder are made of martensitic stainless steel, and the welding seams of two adjacent sub sealing cylinders are processed into V-shaped grooves of a lock bottom type;
step S2, sequentially sleeving the first sub-sealing cylinder, the second sub-sealing cylinder, the third sub-sealing cylinder, the fourth sub-sealing cylinder and the fifth sub-sealing cylinder on the supporting mandrel, and pressing and fixing the first sub-sealing cylinder, the second sub-sealing cylinder, the third sub-sealing cylinder, the fourth sub-sealing cylinder and the fifth sub-sealing cylinder, wherein the first sub-sealing cylinder is close to the fastening end; welding in the V-shaped groove by using a nickel-based welding material ERNiCr-3;
step S3, driving the supporting core rod to rotate by adopting manual argon arc welding and a positioner, wherein the welding adopts a multi-layer and multi-pass welding mode;
and step S4, performing stress relief annealing operation on the welded sealing cylinder of the driving motor.
Further, in the step S1, the angle of the V-shaped groove is 40 °, and the width of the bottom of the V-shaped groove is 4 mm; the bottom of the V-shaped groove is composed of a lock bottom section, the lock bottom section is arranged on the first sub sealing cylinder, the third sub sealing cylinder and the fifth sub sealing cylinder, the lock bottom section extends into the second sub sealing cylinder or the fourth sub sealing cylinder, and the support table is used for supporting the weld joint through the support of the lock bottom section.
Further, in step S2, the holding end of the supporting mandrel is downward, the supporting mandrel is vertically placed on a riveting platform, the sub-sealing cylinders are sequentially sleeved, all the sub-sealing cylinders are assembled in place and then spot-welded, and the 3 positions of the sub-sealing cylinders are uniformly spot-welded in the circumferential direction, and the nuts and the gaskets are pressed and fixed on the supporting mandrel.
Further, in the step S3, the supporting mandrel provided with the sub-seal cartridge is horizontally placed, the holding end of the supporting mandrel is mounted on a three-jaw chuck of the positioner, the fastening end is supported by a roller frame, and welding is performed by horizontal rotation; the welding seams are divided into a first welding seam, a second welding seam, a third welding seam and a fourth welding seam from the first sub sealing cylinder to the fifth sub sealing cylinder, and welding is carried out according to the welding sequence from the third welding seam to the first welding seam to the second welding seam to the fourth welding seam; the multilayer and multi-pass welding is carried out in a way of sequential welding one by one, namely, the first welding layer of all 4 welding seams is welded in a welding sequence from the third welding seam to the first welding seam, the second welding seam and the fourth welding seam, then the second welding layer is welded in a welding sequence from the third welding seam to the first welding seam, the second welding seam and the fourth welding seam, and the welding of all the welding layers is finished by the analogy; during welding, interlayer cleaning is enhanced to ensure fusion among different welding layers and reduce internal defects of welding seams; the welding parameters of the welding process are as follows: the current value is 90-180A, the voltage value is 8-18V, and the welding speed is 10-15 cm/min.
Further, in the step S4, the support core rod, the nut, and the washer are subjected to the stress relief annealing operation together with the welded sealing cylinder of the driving motor, and the annealing temperature is not lower than 500 ℃.
The invention has the beneficial effects that:
1. the welding method of automatic rotation and manual argon arc welding of a workpiece (a device for welding a sealing cylinder and a driving motor) and the welding mode of multilayer multi-pass welding are adopted, and the nickel-based welding material is used for welding the sealing cylinder of dissimilar stainless steel (martensitic stainless steel-austenitic stainless steel). The welding defects in the dissimilar stainless steel welding seam are effectively reduced, the sealing performance of the sealing cylinder of the driving motor is ensured, and the helium leakage detection leakage amount is not more than 6.7 multiplied by 10-7m3×Pa/s。
2. By adding the supporting core rod 1 inside the sealing cylinder of the driving motor during welding, matching with post-welding stress relief annealing and special 'per-pass sequential welding', the adverse effect of a long and thin sealing cylinder and a large-filling-amount welding line large-deflection welding deformation tendency is overcome, the bending deformation of the sealing cylinder of the driving motor is effectively reduced, the post-welding deflection is not more than 1.5mm, and the design and processing requirements are met.
3. The multi-layer multi-pass welding in the step S3 of the method for welding the sealing cylinder of the driving motor reduces the welding deformation caused by uneven welding quantity of 4 welding seams to the maximum extent; meanwhile, the optimization of the welding sequence prevents the possibility of local 'dead bending' of the sealing cylinder of the driving motor.
Drawings
FIG. 1 is a schematic view of an apparatus for welding a sealed canister of a drive motor according to an embodiment of the present invention;
FIG. 2 is a schematic view of a V-groove 12 according to an embodiment of the present invention;
in the figure: 1-supporting core rod, 2-clamping end, 3-fastening end, 4-nut, 5-gasket, 6-supporting table, 7-first sub sealing cylinder, 8-second sub sealing cylinder, 9-third sub sealing cylinder, 10-fourth sub sealing cylinder, 11-fifth sub sealing cylinder, 12-V-shaped groove, 13-locking bottom section, 14-first welding line, 15-second welding line, 16-third welding line and 17-fourth welding line.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, the device for welding the sealing cylinder of the driving motor provided by the invention is characterized in that the sealing cylinder of the driving motor is formed by coaxially connecting a plurality of segments of sealing cylinders in series, wherein the sealing cylinder of the driving motor comprises a cylindrical supporting core rod 1, and the supporting core rod 1 can be arranged in the sealing cylinders in a penetrating manner, so that the sealing cylinders of the driving motor are coaxially connected in series and fixed to form the sealing cylinder of the driving motor to be welded.
One end of the supporting core rod 1 is a clamping end 2 and is provided with a flange for limiting the movement of the sub sealing cylinder; the other end of the supporting core rod 1 is a fastening end 3 which is used for pressing and fixing the sub sealing cylinders which are connected in series together.
The fastening end 3 is provided with a thread structure, and the sub sealing cylinders connected in series are pressed and fixed on the supporting core rod 1 through a nut 4 and a gasket 5.
A plurality of annular supporting tables 6 are arranged on the supporting core rod 1, all the supporting tables 6 are coaxial, and the outer diameters of the supporting tables are consistent (all the supporting tables 6 need to be machined at one time to ensure the concentricity and the straightness); welding seams are arranged at the connecting positions of the two adjacent sub sealing cylinders, the supporting table 6 is positioned below the welding seams of the two adjacent sub sealing cylinders, and when all the sub sealing cylinders are sleeved on the outer side of the supporting core rod 1 and are pressed and fixed together, the supporting table 6 can support the welding seams; the support width of the support table 6 exceeds the width of the weld.
The supporting core rod 1, the nut 4 and the washer 5 are made of stainless steel or carbon steel.
The invention also discloses a method for welding the sealing cylinder of the driving motor, which is used for the device for welding the sealing cylinder of the driving motor, and comprises the following steps:
step S1, the sub-sealing cylinders of the driving motor sealing cylinder comprise a first sub-sealing cylinder 7, a second sub-sealing cylinder 8, a third sub-sealing cylinder 9, a fourth sub-sealing cylinder 10 and a fifth sub-sealing cylinder 11 which are coaxially connected in series in sequence, the first sub-sealing cylinder 7, the third sub-sealing cylinder 9 and the fifth sub-sealing cylinder 11 are made of austenitic stainless steel, the second sub-sealing cylinder 8 and the fourth sub-sealing cylinder 10 are made of martensitic stainless steel, the welding seams of the two adjacent sub-sealing cylinders are processed into V-shaped grooves 12 (shown in figure 2) with lock bottoms, the concentricity of the driving motor sealing cylinder can be guaranteed through the lock bottoms, and meanwhile, the welding seams can be guaranteed to be completely welded; the angle of the V-shaped groove 12 is 40 degrees, the width of the bottom of the V-shaped groove 12 is 4mm, and the V-shaped groove is used for ensuring the bottom of the V-shaped groove 12 to be melted through; the bottom of the V-shaped groove 12 is composed of a lock bottom section 13, the lock bottom section 13 is arranged on the first sub sealing cylinder 7, the third sub sealing cylinder 9 and the fifth sub sealing cylinder 11, the lock bottom section 13 extends into the second sub sealing cylinder 8 or the fourth sub sealing cylinder 10, and the support table 6 supports the weld joint through supporting the lock bottom section 13;
step S2, sequentially sleeving a first sub sealing cylinder 7, a second sub sealing cylinder 8, a third sub sealing cylinder 9, a fourth sub sealing cylinder 10 and a fifth sub sealing cylinder 11 on a support core rod 1 and pressing and fixing the support core rod (further improving the overall rigidity), wherein the first sub sealing cylinder 7 is close to the fastening end 3; a nickel-based welding material ERNiCr-3 is used for welding in the V-shaped groove 12 (the nickel-based welding material has good affinity with various stainless steels and can be used as a welding transition material of dissimilar stainless steels, and the thermal expansion coefficient of the nickel-based welding material is greater than that of martensitic stainless steel and smaller than that of austenitic stainless steel, so that the welding stress can be effectively reduced); the specific operation is that the clamping end 2 of the supporting core rod 1 is downward, vertically placed on a riveting platform, sequentially sleeved with each sub-sealing cylinder, all the sub-sealing cylinders are assembled in place and then subjected to tack welding, and the positions 3 of the sub-sealing cylinders are uniformly tack welded along the circumferential direction of the sub-sealing cylinders and are pressed and fixed on the supporting core rod 1 by nuts 4 and gaskets 5;
step S3, driving the supporting core rod 1 to rotate by adopting manual argon arc welding and a positioner, wherein the welding adopts a multi-layer and multi-pass welding mode to reduce the stress of a welding seam; the specific operation is that a supporting core rod 1 provided with a sub sealing cylinder is horizontally placed, a clamping end 2 of the supporting core rod 1 is arranged on a three-jaw chuck of a positioner, a fastening end 3 is supported by a roller frame and horizontally rotated for welding; the welding seams are divided into a first welding seam 14, a second welding seam 15, a third welding seam 16 and a fourth welding seam 17 by the first sub sealing cylinder 7 to the fifth sub sealing cylinder 11, and the welding is carried out according to the welding sequence from the third welding seam 16 to the first welding seam 14 to the second welding seam 15 to the fourth welding seam 17; the multilayer and multi-pass welding is carried out in a way of sequential welding one by one, namely, the first welding layer (backing welding layer) of all 4 welding seams is welded in a welding sequence from a third welding seam 16 to a first welding seam 14 to a second welding seam 15 to a fourth welding seam 17, then the second welding layer is welded in a welding sequence from the third welding seam 16 to the first welding seam 14 to the second welding seam 15 to the fourth welding seam 17, and the welding of all the welding layers is finished by the analogy; during welding, interlayer cleaning is enhanced to ensure fusion among different welding layers and reduce internal defects of welding seams; the welding parameters of the welding process are as follows: the current value is 90-180A, the voltage value is 8-18V, and the welding speed is 10-15 cm/min;
and step S4, performing stress relief annealing operation on the welded driving motor sealing barrel, and performing stress relief annealing operation on the supporting core rod 1, the nut 4 and the gasket 5 along with the welded driving motor sealing barrel to reduce the deformation of the driving motor sealing barrel, wherein the annealing temperature is not lower than 500 ℃, so that the low internal stress of the driving motor sealing barrel is reduced, and the deformation of the driving motor sealing barrel after welding and in the machining process is prevented.
The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.
Claims (10)
1. The utility model provides a be used for a welded device of driving motor sealed section of thick bamboo, the sealed section of thick bamboo of driving motor comprises a plurality of sections sealed section of thick bamboo coaxial series connection, characterized by: the sealing device comprises a cylindrical supporting core rod (1), wherein the supporting core rod (1) can penetrate through the inside of the sub sealing cylinder, so that the sub sealing cylinder is coaxially connected in series and fixed to form the sealing cylinder of the driving motor to be welded.
2. The apparatus for welding a sealed cartridge of a driving motor as defined in claim 1, wherein: one end of the supporting core rod (1) is a clamping end (2) which is provided with a flange for limiting the movement of the sub sealing cylinder; the other end of the supporting core rod (1) is a fastening end (3) which is used for compressing and fixing the sub sealing cylinders which are connected in series.
3. The apparatus for welding a sealed cartridge of a driving motor as defined in claim 2, wherein: the fastening end (3) is provided with a thread structure, and the sub sealing cylinders connected in series are pressed and fixed on the supporting core rod (1) through nuts (4) and gaskets (5).
4. The apparatus for welding a sealed cartridge of a driving motor according to claim 3, wherein: a plurality of annular supporting tables (6) are arranged on the supporting core rod (1), and all the supporting tables (6) are coaxial and have the same outer diameter; welding seams are arranged at the connecting positions of two adjacent sub sealing cylinders, the supporting tables (6) are positioned below the welding seams, and when all the sub sealing cylinders are sleeved on the outer side of the supporting core rod (1) and are pressed and fixed together, the supporting tables (6) can support the welding seams; the support width of the support table (6) exceeds the width of the weld.
5. The apparatus for welding a sealed cartridge of a driving motor according to claim 4, wherein: the supporting core rod (1), the nut (4) and the washer (5) are made of stainless steel or carbon steel.
6. A method for welding a sealed cylinder of a driving motor for the apparatus for welding a sealed cylinder of a driving motor according to claim 5, comprising the steps of:
step S1, the sub sealing cylinders of the driving motor sealing cylinder comprise a first sub sealing cylinder (7), a second sub sealing cylinder (8), a third sub sealing cylinder (9), a fourth sub sealing cylinder (10) and a fifth sub sealing cylinder (11) which are coaxially connected in series in sequence, the first sub sealing cylinder (7), the third sub sealing cylinder (9) and the fifth sub sealing cylinder (11) are made of austenitic stainless steel, the second sub sealing cylinder (8) and the fourth sub sealing cylinder (10) are made of martensitic stainless steel, and the welding seams of two adjacent sub sealing cylinders are processed into a bottom-locking V-shaped groove (12);
step S2, sequentially sleeving the first sub sealing cylinder (7), the second sub sealing cylinder (8), the third sub sealing cylinder (9), the fourth sub sealing cylinder (10) and the fifth sub sealing cylinder (11) on the supporting core rod (1) and pressing and fixing the supporting core rod, wherein the first sub sealing cylinder (7) is close to the fastening end (3); welding in the V-shaped groove (12) by using a nickel-based welding material ERNiCr-3;
step S3, driving the supporting core rod (1) to rotate by adopting manual argon arc welding and a positioner, wherein the welding adopts a multi-layer multi-pass welding mode;
and step S4, performing stress relief annealing operation on the welded sealing cylinder of the driving motor.
7. The method of claim 6, further comprising: in the step S1, the angle of the V-groove (12) is 40 °, and the bottom width of the V-groove (12) is 4 mm; the bottom of V-arrangement groove (12) comprises lock end section (13), lock end section (13) set up first sub-sealed section of thick bamboo (7), third sub-sealed section of thick bamboo (9) with on the fifth sub-sealed section of thick bamboo (11), lock end section (13) extend to the inside of second sub-sealed section of thick bamboo (8) or fourth sub-sealed section of thick bamboo (10), it is right that brace table (6) are through right the support realization of lock end section (13) is right the support of welding seam.
8. The method of claim 6, further comprising: in the step S2, the holding end (2) of the supporting mandrel (1) is placed on a riveting platform vertically downward, the sub-sealing cylinders are sequentially sleeved, all the sub-sealing cylinders are assembled in place and then subjected to tack welding, and the positions 3 of the sub-sealing cylinders are uniformly tack welded in the circumferential direction by using the nuts (4) and the gaskets (5) to be pressed and fixed on the supporting mandrel (1).
9. The method of claim 6, further comprising: in the step S3, the supporting mandrel (1) provided with the sub-seal cartridge is horizontally placed, the holding end (2) of the supporting mandrel (1) is mounted on a three-jaw chuck of the positioner, and the fastening end (3) is supported by a roller frame and horizontally rotated for welding; the welding seams are divided into a first welding seam (14), a second welding seam (15), a third welding seam (16) and a fourth welding seam (17) by the first sub sealing cylinder (7) to the fifth sub sealing cylinder (11), and the welding is carried out according to the welding sequence from the third welding seam (16) to the first welding seam (14) to the second welding seam (15) to the fourth welding seam (17); when multilayer and multi-pass welding is carried out, a mode of sequential welding is adopted, namely, the first welding layer of all 4 welding passes is welded in a welding sequence from the third welding pass (16) to the first welding pass (14) to the second welding pass (15) to the fourth welding pass (17), then the second welding layer is welded in a welding sequence from the third welding pass (16) to the first welding pass (14) to the second welding pass (15) to the fourth welding pass (17), and the welding of all welding passes is finished by the analogy; during welding, interlayer cleaning is enhanced to ensure fusion among different welding layers and reduce internal defects of welding seams; the welding parameters of the welding process are as follows: the current value is 90-180A, the voltage value is 8-18V, and the welding speed is 10-15 cm/min.
10. The method of claim 6, further comprising: in the step S4, the support core rod (1), the nut (4) and the washer (5) are subjected to the stress relief annealing operation together with the welded sealing cylinder of the driving motor, and the annealing temperature is not lower than 500 ℃.
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| CN202011581384.2A CN112872637B (en) | 2020-12-28 | 2020-12-28 | Device and method for welding sealing cylinder of driving motor |
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| CN202011581384.2A CN112872637B (en) | 2020-12-28 | 2020-12-28 | Device and method for welding sealing cylinder of driving motor |
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