Laser welding tooling and welding method for the lower guide tube of nuclear power reactor internal components

Abstract

A laser welding tool for the lower guide tube of a nuclear power reactor internal component includes a welding tool for the guide tube assembly and a welding tool for the double-tube in the guide tube assembly. The welding tool for the guide tube assembly includes a welding trough frame, the trough frame trough body facing one side, on which a plurality of side baffles are spaced apart, a transverse top block is provided on the other side of the welding trough frame, and a longitudinal top block is provided on the top of the welding trough frame. Both the transverse top block and the longitudinal top block are inserted into the welding trough frame and used to tighten the double-tube in the welding trough frame. The welding tool for the double-tube includes a lower support frame and an upper support frame. The lower support frame and the upper support frame clamp the guide tube assembly. The lower support frame and the upper support frame are fixed at both ends by plates and form two welding operation areas on both sides for welding operations on both sides of the guide tube assembly. The present invention adopts the above structure to effectively improve the welding quality and efficiency of the lower guide tube of the nuclear power reactor internal component.

Description

Technical Field

[0001] The invention relates to a welding auxiliary device in the field of nuclear power, in particular to a laser welding tool and a welding method for a lower guide cylinder of a nuclear power pile internal component. Background Art

[0002] Control rod guide cylinder assemblies, part of nuclear power reactor internals, are crucial for safety and require high quality and precision, as they guide the control rods of nuclear reactors. As a crucial component of the control rod guide cylinder assembly, the lower guide cylinder assembly features a complex structure and numerous parts, placing extremely high demands on weld quality and weld distortion. Currently, lower guide cylinder assemblies are welded using electron beam welding (EBW), a method that requires vacuum, making the weld invisible and imposing high surface roughness requirements. Furthermore, the equipment is expensive, resulting in low efficiency and certain quality risks. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a laser welding tool and a welding method for a lower guide cylinder of a nuclear power pile internal component, so as to improve the welding quality of the lower guide cylinder of the nuclear power pile internal component.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a laser welding tool for the lower guide cylinder of the nuclear power reactor internal component, including a welding tool for the guide cylinder assembly and a welding tool for the double pipe in the guide cylinder assembly;

[0005] The welding tooling for the guide cylinder assembly includes a welding trough frame, the trough body of the welding trough frame faces one side, and a plurality of side baffles are provided at intervals on the side. A transverse top block is provided on the other side of the welding trough frame, and a longitudinal top block is provided on the top of the welding trough frame. Both the transverse top block and the longitudinal top block are inserted into the welding trough frame and used to tighten the double pipes in the welding trough frame.

[0006] The welding tooling used for the double pipe includes a lower support frame and an upper support frame. The lower support frame and the upper support frame clamp the guide cylinder assembly. The two ends of the lower support frame and the upper support frame are fixed by plates and two welding operation areas are formed on both sides for welding operations on both sides of the guide cylinder assembly.

[0007] In a preferred solution, the guide cylinder assembly includes two half square tubes, which are welded together to form an outer shell of the guide cylinder assembly, and two half square tube welds are formed between the two half square tubes.

[0008] In a preferred solution, the guide cylinder assembly further includes a continuous guide assembly located at one end of the two semi-square tubes and a plurality of middle guide plates, and a plurality of double-tubes are arranged inside the continuous guide assembly.

[0009] In a preferred solution, the side baffles are fixed by upper and lower baffle fixing bolts, and multiple welding operation areas are formed between the multiple side baffles.

[0010] In a preferred solution, the transverse top block and the longitudinal top block are both tightened by a top rod with threads passing through the side wall of the welded trough frame.

[0011] In a preferred solution, a middle partition is further provided at the middle position of the welding trough frame, and the middle partition separates the welding trough frame into two left and right working areas.

[0012] In the preferred solution, the upper support frame is provided with a plurality of upper semi-square tube clamping members, which are rods passing through the upper support frame. A pressure head is fixed at the lower end of the upper semi-square tube clamping member, and the pressure head presses the upper semi-square tube in the guide cylinder assembly downward.

[0013] The welding method based on the above-mentioned tooling includes a double-tube welding method and a semi-square tube welding method;

[0014] The welding method of the double pipe includes:

[0015] 1) Processing I-type groove on the welded surface of type A and type B double pipes;

[0016] 2) Install at least ten sets of workpieces on a double-tube welding fixture, with the weld seam areas of the workpieces having I-grooves;

[0017] 3) Place the mandrel inside the workpiece;

[0018] 4) Adjust the workpiece assembly gap and misalignment through the horizontal and vertical top blocks;

[0019] 5) Lift the workpiece and tooling onto the welding platform and place them horizontally;

[0020] 6) Use laser spot welding to spot weld the double pipes in sequence, with two spots on each piece;

[0021] 7) Apply pre-tightening force to the workpiece through the upper semi-square tube clamping piece;

[0022] 8) Use laser welding to weld the double pipes in sequence, and complete each workpiece in one welding;

[0023] The welding method of the semi-square tube comprises:

[0024] 1) Processing I-type groove on the surface to be welded of semi-square tube;

[0025] 2) Install the semi-square tube on the semi-square tube welding fixture, and the part to be welded on the workpiece is an I-type groove;

[0026] 3) spot welding the I-type weld using manual argon arc welding;

[0027] 4) Lift the workpiece and tooling onto the welding platform and place them horizontally;

[0028] 5) Install a straight brace in the semi-square tube window area;

[0029] 6) Using laser welding to spot weld the I-shaped groove in sections, into at least ten sections;

[0030] 7) Lift the rotary welding tool and adjust the weld on the other side to the welding area;

[0031] 8) Using laser welding to spot weld the I-shaped groove in sections, into at least ten sections;

[0032] 9) Using laser welding to penetrate the weld in one pass;

[0033] 10) Lift the rotary welding tool and adjust the weld on the other side to the welding area;

[0034] 11) Laser welding is used to weld the weld through in one pass.

[0035] In a preferred solution, in the double-tube welding method, step 4) requires that the extended portion of the workpiece is placed against a block to prevent air backflow from affecting weld formation.

[0036] In a preferred embodiment, in the semi-square tube welding method, after completing step 2), a pre-tightening force is applied to the workpiece.

[0037] The laser welding fixture and welding method for the lower guide cylinder of a nuclear power reactor internal component provided by the present invention have the following beneficial effects by adopting the above-mentioned structure:

[0038] (1) It can effectively fix and weld the double-tube in the guide cylinder assembly, improve welding efficiency and ensure weld quality and accuracy;

[0039] (2) During the laser welding process, the weld can be directly observed, and the welding parameters can be adjusted in real time to ensure the quality of the welding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention will be further described below with reference to the accompanying drawings and examples:

[0041] Figure 1 It is a structural schematic diagram of the guide cylinder assembly of the present invention.

[0042] Figure 2 It is a schematic diagram of the internal structure of the guide cylinder assembly of the present invention.

[0043] Figure 3 It is a schematic structural diagram of the continuous guide assembly of the present invention.

[0044] Figure 4It is a schematic diagram of the double-tube welding tool structure of the present invention.

[0045] Figure 5 It is a schematic diagram of the welding trough frame structure of the present invention.

[0046] Figure 6 This is a schematic diagram of the semi-square tube welding tooling structure of the present invention.

[0047] Figure 7 This is a schematic diagram of the internal structure of the semi-square tube welding tooling of the present invention.

[0048] In the figure: guide cylinder assembly 1, semi-square tube 2, weld 201 between semi-square tubes, continuous guide assembly 3, middle guide plate 4, double tube 5, welding trough frame 6, side baffle 7, baffle fixing bolt 8, transverse top block 9, longitudinal top block 10, middle partition 11, lower support frame 12, upper support frame 13, upper semi-square tube clamping piece 14, pressure head 141. DETAILED DESCRIPTION

[0049] Example 1:

[0050] like Figure 4-7 A laser welding tool for the lower guide cylinder of a nuclear power reactor internal component includes a welding tool for the guide cylinder assembly 1 and a welding tool for the double tube 5 in the guide cylinder assembly 1;

[0051] The welding tooling for the guide cylinder assembly 1 includes a welding trough frame 6, the trough body of the welding trough frame 6 faces one side, and a plurality of side baffles 7 are provided at intervals on the side. A transverse top block 9 is provided on the other side of the welding trough frame 6, and a longitudinal top block 10 is provided on the top of the welding trough frame 6. Both the transverse top block 9 and the longitudinal top block 10 are inserted into the welding trough frame 6 and are used to tighten the double pipe 5 in the welding trough frame 6;

[0052] The welding tooling for the double tube 5 includes a lower support frame 12 and an upper support frame 13. The lower support frame 12 and the upper support frame 13 clamp the guide cylinder assembly 1. The two ends of the lower support frame 12 and the upper support frame 13 are fixed by plates and form two welding operation areas on both sides for welding operations on both sides of the guide cylinder assembly 1.

[0053] In a preferred solution, the guide cylinder assembly 1 includes two semi-square tubes 2 , which are welded together to form an outer shell of the guide cylinder assembly 1 , and two semi-square tube welds 201 are formed between the two semi-square tubes 2 .

[0054] In a preferred solution, the guide cylinder assembly 1 further includes a continuous guide assembly 3 located at one end of the two semi-square tubes 2 and a plurality of middle guide plates 4, and a plurality of double tubes 5 are arranged inside the continuous guide assembly 3.

[0055] In a preferred solution, the side baffles 7 are fixed by upper and lower baffle fixing bolts 8 , and multiple welding operation areas are formed between the multiple side baffles 7 .

[0056] In a preferred solution, the transverse top block 9 and the longitudinal top block 10 are both tightened by a top rod with threads passing through the side wall of the welded trough frame 6.

[0057] In a preferred solution, a middle partition 11 is further provided at the middle position of the welding trough frame 6, and the middle partition 11 separates the welding trough frame 6 into two left and right working areas.

[0058] In the preferred solution, a plurality of upper semi-square tube pressing members 14 are provided on the upper support frame 13. The upper semi-square tube pressing members 14 are rods passing through the upper support frame 13. A pressure head 141 is fixed at the lower end of the upper semi-square tube pressing member 14. The pressure head 141 presses the upper semi-square tube 2 in the guide cylinder assembly 1 downward.

[0059] Example 2:

[0060] Based on the above welding tooling,

[0061] The welding methods for the double tube 5 and the semi-square tube 2 are as follows:

[0062] The welding method of the double pipe 5 includes:

[0063] 1) Processing I-shaped grooves on the surfaces to be welded of the A-type and B-type double pipes 5;

[0064] 2) Install at least ten sets of workpieces on a double-tube welding fixture, with the weld seam areas of the workpieces having I-grooves;

[0065] 3) Place the mandrel inside the workpiece;

[0066] 4) Adjust the workpiece assembly gap and misalignment through the horizontal top block 9 and the longitudinal top block 10;

[0067] 5) Lift the workpiece and tooling onto the welding platform and place them horizontally;

[0068] 6) Use laser spot welding to spot weld the double pipes in sequence, with two spots on each piece;

[0069] 7) Apply pre-tightening force to the workpiece through the upper semi-square tube clamping member 14;

[0070] 8) Use laser welding to weld the double pipes in sequence, and complete each workpiece in one welding;

[0071] The welding method of the semi-square tube 2 includes:

[0072] 1) Processing I-shaped groove on the surface to be welded of semi-square tube 2;

[0073] 2) Install the semi-square tube 2 on the semi-square tube welding fixture, and the part of the workpiece to be welded is an I-type groove;

[0074] 3) spot welding the I-type weld using manual argon arc welding;

[0075] 4) Lift the workpiece and tooling onto the welding platform and place them horizontally;

[0076] 5) Install a straight brace in the semi-square tube window area;

[0077] 6) Using laser welding to spot weld the I-shaped groove in sections, into at least ten sections;

[0078] 7) Lift the rotary welding tool and adjust the weld on the other side to the welding area;

[0079] 8) Using laser welding to spot weld the I-shaped groove in sections, into at least ten sections;

[0080] 9) Using laser welding to penetrate the weld in one pass;

[0081] 10) Lift the rotary welding tool and adjust the weld on the other side to the welding area;

[0082] 11) Laser welding is used to weld the weld through in one pass.

[0083] In a preferred solution, in the welding method of the double-tube 5, step 4) requires that the extended portion of the workpiece is placed against a block to prevent air backflow from affecting the weld formation.

[0084] In a preferred embodiment, in the method for welding the semi-square tube 2, the welding process of applying a pre-tightening force to the workpiece using the above-mentioned tooling is as follows:

[0085] Example 3:

[0086] In the actual welding process, double tube 5 laser welding:

[0087] First, perform laser spot welding to fix it, and then perform laser penetration welding. The length of the double pipe is 552mm. After spot welding two points, the entire pipe can be welded.

[0088] Semi-square tube 2 laser welding:

[0089] First, perform laser spot welding to fix it, and then perform laser penetration welding. The length of the semi-square tube is 2402mm, and there are ten spot welding points, each section is about 50mm. If the number of spot welding is small, the penetration welding may cause biting, so the whole piece can be welded by penetration welding.

[0090] The welding parameters when using the above tooling for welding are as follows:

[0091]

Claims

1. A laser welding tool for the lower guide tube of a nuclear power reactor internal component, characterized by: It comprises a welding tool for the guide cylinder assembly (1) and a welding tool for the double-jointed tube (5) in the guide cylinder assembly (1); The welding tool for the guide cylinder assembly (1) includes a welding trough frame (6), the trough body of the welding trough frame (6) faces one side, and a plurality of side baffles (7) are provided at intervals on the side. A transverse top block (9) is provided on the other side of the welding trough frame (6), and a longitudinal top block (10) is provided on the top of the welding trough frame (6). Both the transverse top block (9) and the longitudinal top block (10) are inserted into the welding trough frame (6) and used to tighten the double pipe (5) in the welding trough frame (6); The welding tool for the double-tube (5) comprises a lower support frame (12) and an upper support frame (13), wherein the lower support frame (12) and the upper support frame (13) clamp the guide cylinder assembly (1), and the two ends of the lower support frame (12) and the upper support frame (13) are fixed by plates and form two welding operation areas on both sides for welding operations on both sides of the guide cylinder assembly (1); A middle partition (11) is further provided at the middle position of the welding trough frame (6), and the middle partition (11) separates the welding trough frame (6) into two left and right working areas; The welding method of the laser welding fixture for the lower guide tube of the nuclear power reactor internal component includes a double tube (5) welding method and a semi-square tube (2) welding method; The welding method of the double-tube (5) includes: 1) Processing I-type grooves on the surfaces to be welded of the A-type and B-type double pipes (5); 2) Install at least ten sets of workpieces on a double-tube welding fixture, with the weld seam areas of the workpieces having I-grooves; 3) Place the mandrel inside the workpiece; 4) Adjusting the workpiece assembly gap and misalignment through the transverse top block (9) and the longitudinal top block (10); 5) Lift the workpiece and tooling onto the welding platform and place them horizontally; 6) Use laser spot welding to spot weld the double pipes in sequence, with two spots on each piece; 7) applying a pre-tightening force to the workpiece through the upper semi-square tube pressing member (14); 8) Use laser welding to weld the double pipes in sequence, and complete each workpiece in one welding; The welding method of the semi-square tube (2) comprises: 1) Processing an I-shaped groove on the surface to be welded of the semi-square tube (2); 2) Installing the semi-square tube (2) on the semi-square tube welding fixture, the part of the workpiece to be welded is an I-shaped groove; 3) Using manual argon arc welding to spot weld the welded area and form an I-type weld; 4) Lift the workpiece and tooling onto the welding platform and place them horizontally; 5) Install a straight brace in the semi-square tube window area; 6) Using laser welding to spot weld the I-shaped groove in sections, into at least ten sections; 7) Lift the rotary welding tool and adjust the weld on the other side to the welding area; 8) Using laser welding to spot weld the I-shaped groove in sections, into at least ten sections; 9) Using laser welding to penetrate the weld in one pass; 10) Lift the rotary welding tool and adjust the weld on the other side to the welding area; 11) Laser welding is used to penetrate the weld in one pass.

2. The laser welding tool for the lower guide tube of a nuclear power reactor internal component according to claim 1, characterized in that: The guide cylinder assembly (1) comprises two semi-square tubes (2), the two semi-square tubes (2) being welded together to form an outer shell of the guide cylinder assembly (1), and two semi-square tube inter-tube welds (201) being formed between the two semi-square tubes (2).

3. The laser welding tool for the lower guide tube of a nuclear power reactor internal component according to claim 2, characterized in that: The guide cylinder assembly (1) further comprises a continuous guide assembly (3) located at one end of the two semi-square tubes (2) and a plurality of middle guide plates (4), wherein a plurality of double-connected tubes (5) are arranged inside the continuous guide assembly (3).

4. The laser welding tool for the lower guide tube of a nuclear power reactor internal component according to claim 1, characterized in that: The side baffles (7) are fixed by upper and lower baffle fixing bolts (8), and multiple welding operation areas are formed between the multiple side baffles (7).

5. The laser welding tool for the lower guide tube of a nuclear power reactor internal component according to claim 1, characterized in that: The transverse top block (9) and the longitudinal top block (10) are both tightened by a top rod with threads passing through the side wall of the welded trough frame (6).

6. The laser welding tool for the lower guide tube of a nuclear power reactor internal component according to claim 2, characterized in that: The upper support frame (13) is provided with a plurality of upper semi-square tube pressing members (14), each of which is a rod passing through the upper support frame (13). A pressure head (141) is fixedly provided at the lower end of the upper semi-square tube pressing member (14), and the pressure head (141) presses the upper semi-square tube (2) in the guide cylinder assembly (1) downward.

7. The laser welding tool for the lower guide tube of a nuclear power reactor internal component according to claim 1, characterized in that: In the double-tube (5) welding method, step 4) requires that a block be installed at the extended portion of the workpiece to prevent air backflow from affecting the weld formation.

8. The laser welding tool for the lower guide tube of a nuclear power reactor internal component according to claim 1, characterized in that: In the semi-square tube (2) welding method, in step 2), a pre-tightening force is applied to the workpiece.

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