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Wedge welding method and welding structure for large-calibre plastic pipes

A plastic pipe and large-diameter technology, which is applied in the direction of pipeline connection arrangement, pipe/pipe joint/pipe fitting, mechanical equipment, etc., can solve the problem of smaller contact area between two pipe bodies, difficulty in welding large-diameter pipes, poor connection strength of pipes, etc. problems, to achieve the effect of increased strength, stable pressure holding and convenient operation

Pending Publication Date: 2019-09-20
王子艺
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a large-diameter pipe body is socketed, due to the large diameter of the pipe body, the diameter error of the pipe body also increases, which may be elliptical. The error of the two pipes is large, resulting in a smaller contact area between the two pipe bodies. Poor connection strength and poor sealing
[0007] Therefore, there are certain difficulties in the welding of large-diameter pipes in the prior art

Method used

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  • Wedge welding method and welding structure for large-calibre plastic pipes
  • Wedge welding method and welding structure for large-calibre plastic pipes
  • Wedge welding method and welding structure for large-calibre plastic pipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 11

[0088] In the primary welding and the secondary welding, the welding hole and the taper pin are heated separately, and the specific steps b3 and c3 are the same, including the following steps:

[0089] e1. Separately heat the inner surfaces of the primary welding hole 11 and the secondary welding hole 12, and the outer surfaces of the primary cone pin 13 and the secondary cone pin 14, so that they all have a softening layer with a thickness of 2-5mm;

[0090] e2. Place the primary taper pin 13 and the secondary taper pin 14 in the corresponding primary welding hole 11 and secondary welding hole 12;

[0091] e3. Squeeze from the large end of the primary taper pin 13 and the secondary taper pin 14 to the small end, or pull from the small end.

Embodiment 12

[0093] In the primary welding, the primary welding hole 11 and the primary taper pin 13 are heated simultaneously, and in the secondary welding, the secondary welding hole 12 and the secondary taper pin 14 are heated separately.

[0094] The specific step b3 includes the following steps: f1. Helically winding the heating wire on the surface of the primary cone pin 13;

[0095] f2. Place the primary taper pin 13 in the corresponding primary welding hole 11, and energize the heating wire to melt the contact surface to achieve welding;

[0096] f3. Squeeze from the large end of the primary taper pin 13 to the small end, or pull it from the small end.

[0097] Step c3 includes the following steps:

[0098] e1. Separately heat the inner surface of the secondary welding hole 12 and the outer surface of the secondary taper pin 14 so that they all have a 2-5mm thick softening layer;

[0099] e2. Place the secondary taper pin 14 in the corresponding secondary welding hole 12;

[010...

Embodiment 13

[0102] In the primary welding, the primary welding hole 11 and the primary taper pin 13 are heated separately, and in the secondary welding, the secondary welding hole 12 and the secondary taper pin 14 are heated simultaneously.

[0103] Concrete step b3 comprises the following steps:

[0104] e1. Separately heat the inner surface of the primary welding hole 11 and the outer surface of the primary taper pin 13 so that they all have a 2-5mm thick softening layer;

[0105] e2. Place the primary taper pin 13 in the corresponding primary welding hole 11;

[0106] e3. Squeeze from the large end of the primary taper pin 13 to the small end, or pull it from the small end.

[0107] Step c3 includes the following steps:

[0108] f1. Helically wind the heating wire on the surface of the secondary cone pin 14;

[0109] f2. Place the secondary cone pin 14 in the corresponding secondary welding hole 12, and energize the heating wire to melt the contact surface to achieve welding;

[01...

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Abstract

The invention discloses a wedge welding method and welding structure for large-calibre plastic pipes. The wedge welding method and welding structure are suitable for forming straight pipes, elbows and tees of the large calibre (diameter DN 3,000 mm or more) and with thick wall pipes (200 mm or more). The connection fixing of two pipe bodies is achieved by one or two welding processes. By using the wedge-shaped surface structures of tapered pins, on the one hand, the tapered pins can be easily placed into welding holes, and on the other hand, in combination with the characteristic that the length of the tapered pins is greater than the depth of the welding holes, the axial force is applied to tapered pin shafts; and the tapered pins are driven to move into the welding holes, the welding holes are extruded by the taper surfaces of the tapered pin shafts, the tapered pins and the welding holes are extruded by the surface contact, the pressure maintaining is stable, the effect is good, and the strength of the connection of the tapered pins and the pipe bodies is improved.

Description

technical field [0001] The invention relates to the technical field of welding large-diameter plastic pipes, in particular to a wedge-shaped welding method and welding structure for large-diameter plastic pipes, which is suitable for straight pipes with large diameters (diameter above DN3000mm) and thick-walled pipes (200mm above), Forming of elbows and tees. Background technique [0002] Welding is the process of forming an integral joint by means of the connection between atoms and the diffusion between protons. It can also be considered that welding is a method of connecting two or more workpieces together by using thermal energy or mechanical pressure, or both, and using filler materials to form an inseparable and strong joint. [0003] The existing welding forms for large-diameter pipes mainly include groove fusion welding, hot-melt butt welding and socket welding using electric fuses. [0004] Groove fusion welding generally adopts electric fusion welding torch, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L47/02B29C65/02
CPCF16L47/02B29C65/02B29C66/05
Inventor 王利群刘志军罗佳王子艺
Owner 王子艺
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