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CN-122007540-A - High-strength sealing joint, butt-joint workpiece assembly welding tool and brazing method

CN122007540ACN 122007540 ACN122007540 ACN 122007540ACN-122007540-A

Abstract

The invention belongs to the technical field of brazing, and particularly relates to a high-strength sealing joint, a butt-joint workpiece assembly welding tool and a brazing method. The high-strength sealing joint comprises an inner sleeve and two butt joint workpieces, wherein the butt joint workpieces are provided with inner holes, the butt joint surfaces of the butt joint workpieces are milled and smooth, a middle hole is formed in the inner wall, close to one end, of the butt joint surfaces, of each butt joint workpiece, and the inner sleeve is placed in the middle hole of each butt joint workpiece. The invention provides a high-strength sealing joint, a butt-joint workpiece assembly welding tool and a brazing method, which meet the requirement of high-strength sealing performance and have strong operability, and the joint is also suitable for manufacturing water-cooled or other condensing agent-cooled hydropower, thermoelectric unit coils and annular leads.

Inventors

  • FU LUBIN
  • NIE CHAOSHUANG
  • ZENG XUEYUAN
  • LI YOUWEI
  • ZHAO JIANGBO
  • PAN SHAOMIN

Assignees

  • 东方电气集团东方电机有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (10)

  1. 1. The high-strength sealing joint is characterized by comprising an inner sleeve (1) and two butt joint workpieces (2), wherein the butt joint workpieces (2) are provided with inner holes (21), the butt joint surfaces of the butt joint workpieces (2) are milled and flattened, the inner wall of one end, close to the butt joint surfaces, of each butt joint workpiece (2) is provided with a middle hole (22), and the inner sleeve (1) is placed in the middle hole (22) of each butt joint workpiece (2).
  2. 2. A high-strength sealing joint according to claim 1, wherein the intermediate hole (22) is extended by 10 +0.1 mm in a direction away from the other butt joint workpiece (2) with the butt joint surface as a reference, and the radius of the intermediate hole (22) is 1.5-2 mm smaller than the radius of the inner hole (21).
  3. 3. A high-strength sealing joint according to claim 2, wherein the accumulated length of the middle holes (22) of the two butt-joint workpieces (2) is 20 +0.2 mm, and the accumulated length of the middle holes (22) of the two butt-joint workpieces (2) is 0.1-0.2 mm longer than that of the inner sleeve (1).
  4. 4. A high-strength sealing joint according to claim 2, characterized in that the inner diameter of the inner sleeve (1) is the same as the inner diameter of the abutment work piece (2).
  5. 5. The high-strength sealing joint as claimed in claim 4, wherein the gap between the outer diameter of the inner sleeve (1) and the inner wall of the middle hole (22) of the two butt joint workpieces (2) is controlled to be 0.05-0.1 mm.
  6. 6. A high-strength sealing joint according to claim 1, wherein the inner sleeve (1) is made of the same material as the butt joint workpiece (2).
  7. 7. A butt-joint workpiece assembly welding tool is used for butt-joint of the high-strength sealing joint disclosed in claim 1 and is characterized by comprising a supporting table (3), wherein a mounting groove (31) is formed in the supporting table (3), two butt-joint workpieces (2) are placed in the mounting groove (31), one side of the mounting groove (31) is used as a workpiece placement reference surface (32), the other side of the mounting groove (31) is connected with a plurality of compression screws (33) used for compressing the butt-joint workpieces (2), the butt-joint workpieces (2) are connected with clamps (4) used for clamping the butt-joint workpieces (2) at the butt joint positions, and a tensioning unit (5) used for tensioning the two clamps (4) is connected between the clamps (4) of the two butt-joint workpieces (2).
  8. 8. The butt-joint workpiece assembly welding tool of claim 7, wherein the tensioning unit (5) comprises tensioning screws (51), the tensioning screws (51) sequentially penetrate through the two clamps (4), one end of each tensioning screw (51) penetrating out of one clamp (4) is connected with a first nut (52) through a nut, one end of each tensioning screw (51) penetrating out of the other clamp (4) is sleeved with a gasket (53), one side, far away from each clamp (4), of each gasket (53) is connected with a spring (54), the other end of each spring (54) is connected with a second nut (55), and the second nuts (55) are in threaded connection with the tensioning screws (51).
  9. 9. The assembly welding tool for butted workpieces according to claim 7, further comprising an inductor (6), wherein the inductor (6) comprises an induction main body (61), one end of the induction main body (61) is bent into a door-shaped structure (62), and the door-shaped structure (62) is sleeved at the butt joint position of the two butted workpieces (2).
  10. 10. A method for brazing a high-strength airtight joint, using the butt-joint workpiece assembly welding tool according to claim 9, comprising the steps of: S1, two butt joint workpieces (2) penetrate through a supporting table (3), and the two butt joint workpieces (2) are respectively fixed through a compression screw (33) by taking one side of a mounting groove (31) of the supporting table (3) as a reference; S2, cleaning the butt joint of two butt joint workpieces (2), inserting an inner sleeve (1) into a middle hole (22) of the two butt joint workpieces (2), presetting sheet brazing filler metal at the butt joint of the two butt joint workpieces (2), and finally guiding and positioning the two butt joint workpieces (2) through the inner sleeve (1); S3, respectively clamping the two clamps (4) on the left side and the right side of the butt joint of the two butt joint workpieces (2), and connecting the clamps (4) on the two sides of the butt joint together through a plurality of tensioning units (5); And S4, nesting the inductor (6) at the butt joint position of the two butt joint workpieces (2), adjusting the output power of the welding machine to a specified parameter, starting a heating power supply of the welding machine, starting the welding machine to continuously heat when the butt joint position of the two butt joint workpieces (2) is dark red, filling the strip-shaped brazing filler metal when the preset sheet-shaped brazing filler metal is melted and begins to flow, stopping filling the filler when the butt joint position is round and full, naturally cooling the two butt joint workpieces (2) to room temperature, taking down the inductor (6), removing the assembly welding tool, and cleaning oxide skin and the brazing filler metal accumulation high points on the surfaces of the butt joint workpieces (2).

Description

High-strength sealing joint, butt-joint workpiece assembly welding tool and brazing method Technical Field The invention belongs to the technical field of brazing, and particularly relates to a high-strength sealing joint, a butt-joint workpiece assembly welding tool and a brazing method. Background In the manufacturing process of the controllable nuclear fusion device, the coil joint is brazed while winding the coil in the production process of the CS coil or the PF coil. Because of the harsh operating conditions of the coil, special requirements (not lower than the performance of the base material) are put on the structure, mechanical property and tightness of the coil joint. At present, most of joints of pipe fittings in the connecting process are direct butt joints or external sleeve joints. The direct butt joint has high brazing operation difficulty and relatively low strength (generally about 80% of the strength of a base metal), and inner holes are blocked to a certain extent after welding, so that the water flow of the hollow copper pipe is influenced, and the cooling performance is reduced. The strength of the external sleeve joint is greatly increased, the risk of blocking an inner hole still exists, the application range is limited, and the external sleeve joint is not suitable for the coil manufacturing process of connecting and assembling and welding while winding, because the external sleeve is increased in winding difficulty and overall coil size, and meanwhile, difficulty and discharge risk are brought to the wrapping insulating layer. Disclosure of Invention In order to solve the problems in the prior art, the invention aims to provide a high-strength sealing joint, a butt-joint workpiece assembly welding tool and a brazing method, which meet the requirement of high-strength sealing performance and have strong operability, and the joint is also suitable for manufacturing water-cooled or other condensing agent-cooled hydropower, thermoelectric unit coils and annular leads. The technical scheme adopted by the invention is as follows: The utility model provides a high strength leakproofness connects, includes inner skleeve and two butt joint work pieces, and the butt joint work piece has the hole, and the butt joint face milling of butt joint work piece is leveled, and the inner wall that the butt joint work piece is close to the one end of butt joint face is provided with the mesopore, and the inner skleeve is placed in the mesopore of two butt joint work pieces. As a preferable scheme of the invention, the middle hole is extended by 10 +0.1 mm in a direction away from another butt joint workpiece by taking the butt joint surface as a reference, and the radius of the middle hole is 1.5-2 mm smaller than that of the inner hole. As a preferable scheme of the invention, the accumulated length of the middle hole milling of the two butt joint workpieces is 20 +0.2 mm, and the accumulated length of the middle hole milling of the two butt joint workpieces is 0.1-0.2 mm longer than that of the inner sleeve. As a preferable mode of the invention, the inner diameter of the inner sleeve is the same as the inner diameter of the butt joint workpiece. As a preferable scheme of the invention, the gap between the outer diameter of the inner sleeve and the inner wall of the middle hole of the two butt joint workpieces is controlled to be 0.05-0.1 mm. As a preferable scheme of the invention, the material of the inner sleeve is the same as that of the butt joint workpiece. The butt joint surfaces of the two workpieces are milled and flattened, the end parts of the two joints are respectively extended with middle holes with the thickness of about 10mm and the wall thickness of about 1.5-2 mm by taking the original inner holes as the reference, so as to place the inner sleeve. The length of the inner sleeve is about 20mm, its inner diameter and butt joint the inner diameters of the workpieces are the same, the wall thickness is 1.5-2 mm, the material is the same as that of the butt joint workpiece. The main function of the inner sleeve is guiding and positioning, so that two workpieces are conveniently butted and leveled. The length of the inner sleeve is determined according to the capillary flow length (about 10-15 mm) of the liquid solder during the soldering period. In the brazing process, sheet brazing filler metal is preset only at the butt joint position of two butt joint workpieces, the inner holes are effectively prevented from being blocked, and meanwhile, the melted preset brazing filler metal just reaches the two ends of the inner sleeve under the capillary action. The accumulated length of hole milling in the two butt-joint workpieces is 20 +0.2 mm, and the inner sleeve is in clearance fit with the two butt-joint workpieces. The accumulated length of the holes in the two butt-joint workpieces is slightly longer than the length of the inner sleeve, and is generally controlled to be 0.1-0.2 mm, and the