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CN-121988856-A - Pipe fitting welding device adopting asymptotic electromagnetic welding mode

CN121988856ACN 121988856 ACN121988856 ACN 121988856ACN-121988856-A

Abstract

The invention belongs to the field of electromagnetic forming of metal workpieces, and discloses a pipe fitting welding device adopting an asymptotic electromagnetic welding mode, which comprises a first end coil, a second end coil, a plurality of compression coils, a plurality of bulging coils, an inner pipe fitting and an outer pipe fitting; the axial centers of the inner pipe fitting and the outer pipe fitting are aligned, the welding area of the inner pipe fitting and the welding area of the outer pipe fitting are axially overlapped, the first end coil is used for applying axial electromagnetic force to the inner pipe fitting, the second end coil is used for applying axial electromagnetic force to the outer pipe fitting, the bulging coil is used for applying radial outward electromagnetic force to the inner pipe fitting, and the compression coil is used for applying radial inward electromagnetic force to the outer pipe fitting. The welding device has the advantages of realizing the welding of the pipe fitting from the line to the surface, being convenient for accurately controlling the welding process of the pipe fitting, improving the welding effect and quality of the pipe fitting, adopting a plurality of end coils, compression coils and bulging coils to realize a diversified electromagnetic force application mode, improving the welding strength of the pipe fitting and ensuring that the welding part of the pipe fitting is firmer.

Inventors

  • QIU LI
  • YIN PENGLEI

Assignees

  • 三峡大学

Dates

Publication Date
20260508
Application Date
20230521

Claims (9)

  1. 1. The pipe fitting welding device adopting the asymptotic electromagnetic welding mode is characterized by comprising a first end coil, a second end coil, a plurality of compression coils, a plurality of bulging coils, an inner pipe fitting and an outer pipe fitting, wherein the axes of the inner pipe fitting and the outer pipe fitting are aligned, and the welding area of the inner pipe fitting and the welding area of the outer pipe fitting are axially overlapped; the first end coil, the second end coil, the compression coil and the bulging coil are respectively connected with corresponding coil power supplies; The device comprises a first end coil, a second end coil, a bulging coil, a compression coil, a bulging coil, a compression coil and a compression coil, wherein the first end coil is used for applying axial electromagnetic force to an inner pipe; the pipe fitting welding device adopts an asymptotic electromagnetic welding mode of asymptotically conducting a compression coil, an bulging coil and an asymptotically loading electromagnetic force on welding areas of the inner pipe fitting and the outer pipe fitting.
  2. 2. The pipe fitting welding apparatus employing an asymptotic electromagnetic welding mode according to claim 1, wherein the 1, 2..n compression coils are sequentially spaced apart along the outer surface of the welding zone of the outer pipe fitting, the first end coil and the 1 st bulging coil are adjacently arranged, and n is the number of compression coils.
  3. 3. The welding apparatus for tubular members employing an asymptotic electromagnetic welding mode, according to claim 2, characterized in that the 1,2. N bulging coils are sequentially spaced apart along the inner surface of the welding zone of the inner tubular member, and the second end coil and the n compression coil are adjacently disposed.
  4. 4. The pipe fitting welding apparatus adopting an asymptotic electromagnetic welding mode according to claim 1, characterized in that the distance between the compression coil and the outer pipe fitting is not more than 4mm.
  5. 5. The pipe fitting welding apparatus adopting an asymptotic electromagnetic welding mode according to claim 1, characterized in that the spacing between the bulging coil and the inner pipe fitting is not more than 3.5mm.
  6. 6. The pipe fitting welding device adopting the asymptotic electromagnetic welding mode according to claim 2 or 3, wherein the asymptotic electromagnetic welding mode energizes the ith-1 compression coil and the ith bulging coil together, increases the axial and radial electromagnetic force received by a welding area of the inner pipe fitting between the ith compression coil and the ith bulging coil, improves welding compactness, and is more than or equal to 2 and less than or equal to i < n.
  7. 7. A method of welding a pipe welding apparatus according to any one of claims 1 to 5, wherein the method comprises the steps of: (1) Connecting the first end coil, the 1 st compression coil and the 1 st bulging coil with a coil power supply through a switch and electrifying, generating induction current in a welding area of an inner pipe and a welding area of an outer pipe between the 1 st compression coil and the 1 st bulging coil, and carrying out local welding under the action of axial electromagnetic force, radial outward electromagnetic force and radial inward electromagnetic force; (2) Connecting the 2 nd compression coil and the 2 nd bulging coil with a coil power supply through a switch and electrifying, generating induction current in a welding area of an inner pipe and a welding area of an outer pipe between the 2 nd compression coil and the 2 nd bulging coil, and carrying out local welding under the action of axial electromagnetic force, radial outward electromagnetic force and radial inward electromagnetic force; (3) Connecting the ith compression coil and the ith bulging coil with a coil power supply through a switch and electrifying, generating induction current in a welding area of an inner pipe and a welding area of an outer pipe between the ith compression coil and the ith bulging coil, and carrying out local welding under the action of axial electromagnetic force, radial outward electromagnetic force and radial inward electromagnetic force, wherein i < n is more than or equal to 2, and n is the number of the compression coils; i=i+1; (4) Judging whether i < n is true, if so, repeating the step (3), otherwise, executing the step (5); (5) The nth compression coil, the nth bulging coil and the second end coil are connected with a coil power supply through a switch and electrified, induction current is generated in a welding area of an inner pipe and a welding area of an outer pipe between the nth compression coil and the nth bulging coil, welding is carried out under the action of axial electromagnetic force, radial outward electromagnetic force and radial inward electromagnetic force, and welding of the pipe and the outer pipe is completed.
  8. 8. The welding method of claim 7, further comprising a pretreatment process prior to step (1): (a) Cleaning the outer surface of a welding area of the inner pipe fitting and polishing the outer surface to be smooth; (b) And cleaning the inner surface of the welding area of the outer pipe fitting and polishing the inner surface smoothly.
  9. 9. The welding method according to claim 7, further comprising the repair welding process after the step (5), wherein whether the welding area of the inner pipe fitting and the welding area of the outer pipe fitting are cold or not is checked, if the cold or cold exists, the compression coil and the bulging coil at the cold or cold place are connected with the coil power supply and are electrified, and the local welding is performed again at the cold or cold place.

Description

Pipe fitting welding device adopting asymptotic electromagnetic welding mode Technical Field The invention belongs to the field of electromagnetic forming of metal workpieces, and particularly relates to a pipe fitting welding device adopting an asymptotic electromagnetic welding mode. Background The electromagnetic pulse welding of pipe fitting belongs to one kind of solid state welding in which the welding process has no melting process, so that the problems of burning loss of beneficial alloy elements and invasion of harmful elements into welding seams are avoided, the welding process is simplified, the welding quality is improved, the cost is low, the production efficiency is high, the energy consumption pollution is small, the production process is simple, the automatic control is easy to realize, and the method has very good development prospect. However, the electromagnetic pulse welding of the existing pipe fitting has some technical problems which limit the development of the technology. In the traditional pipe electromagnetic welding technology, a single coil is arranged on the outer side of an outer pipe, a capacitor power supply discharges the coil through a discharge switch to generate pulse current, and radial electromagnetic force between the coil and the pipe enables the inner pipe and the outer pipe to collide at a high speed, so that welding is realized. The method for welding the single-coil loading pipe fitting has the advantages that the electromagnetic force application mode is single, the electromagnetic welding strength is insufficient, and the welding part is easy to be unstable. The Chinese patent No. CN 101905375A discloses a magnetic pulse connection method for thin-wall metal pipeline and its joint structure, and adopts coil-magnetic collector composite inductor or coil inductor to connect with electromagnetic pulse forming equipment so as to implement magnetic pulse connection for pipelines with various metal materials and various structural shapes. According to the electromagnetic pulse welding method, only a single coil is arranged on the outer side of the outer pipe fitting, radial electromagnetic force is provided for the outer pipe fitting, the outer pipe fitting and the inner pipe fitting are compressed to collide in an impact manner, welding is achieved, and the problems that the electromagnetic force application mode is single and the electromagnetic welding strength is insufficient still exist. The utility model patent with publication number CN 206839400U discloses a bidirectional loading pipe electromagnetic welding device, which discloses a bidirectional loading pipe electromagnetic welding method, on the basis of traditional welding, a bulging coil is put into an inner pipe, a compression coil is put out of an outer pipe, and the compression bulging is carried out at the same time, so that the problem of low radial electromagnetic force intensity is solved, but the electromagnetic welding device is the same as the traditional pipe welding, and the welding part is unstable due to uniform welding. Disclosure of Invention The invention aims at solving the problems and provides a pipe fitting welding device adopting an asymptotic electromagnetic welding mode, which adopts an asymptotic conduction coil and an asymptotic electromagnetic force loading mode for welding areas of inner and outer pipe fittings to realize accurate control of the pipe fitting welding process and improve the pipe fitting welding effect. The technical scheme is that the pipe fitting welding device adopting the asymptotic electromagnetic welding mode comprises a first end coil, a second end coil, a plurality of compression coils, a plurality of bulging coils, an inner pipe fitting and an outer pipe fitting, wherein the axes of the inner pipe fitting and the outer pipe fitting are aligned, and the welding area of the inner pipe fitting and the welding area of the outer pipe fitting are axially overlapped. The first end coil, the second end coil, the compression coil and the bulging coil are respectively connected with corresponding coil power supplies. The first end coil is used for applying axial electromagnetic force to the inner pipe, the second end coil is used for applying axial electromagnetic force to the outer pipe, the bulging coil is used for applying radial outward electromagnetic force to the inner pipe, and the compression coil is used for applying radial inward electromagnetic force to the outer pipe. The pipe fitting welding device adopts an asymptotic electromagnetic welding mode of asymptotically conducting a compression coil, an bulging coil and an asymptotically loading electromagnetic force on welding areas of the inner pipe fitting and the outer pipe fitting. Preferably, the 1,2. N compression coils are sequentially spaced along the outer surface of the weld zone of the outer tubular member, the first end coil and the 1 st bulging coil being adjacently disposed, n being the num