阅读说明：本技术 一种电熔旁通鞍形管件焊接热变形调控方法 (Method for regulating and controlling welding thermal deformation of electric smelting bypass saddle-shaped pipe fitting ) 是由 陈源 陈建强 汪晓岗 赵立刚 刘维玉 于 2020-12-01 设计创作，主要内容包括：本发明提供一种电熔旁通鞍形管件焊接热变形调控方法,包括以下步骤：(1)采用塑料注塑工艺注塑旁通主体,并将温控形状记忆合金在旁通主体注塑的过程中嵌设在旁通主体内部；(2)将电热丝挤压嵌入在所述管道连接部的鞍型圆弧焊接面上；(3)将旁通主体捆绑在主燃气管道上,给电热丝通电,电热丝发热使鞍型圆弧焊接面处材料熔化,使得旁通主体与主燃气管道熔焊在一起。本发明既可通过椭圆螺旋线布丝减小温度不均匀的扭曲变形,又可通过温控形状记忆合金来控制剩余的扭曲变形。(The invention provides a method for regulating and controlling welding thermal deformation of an electric smelting bypass saddle-shaped pipe fitting, which comprises the following steps of: (1) the bypass main body is injection-molded by adopting a plastic injection molding process, and the temperature-control shape memory alloy is embedded in the bypass main body in the injection molding process of the bypass main body; (2) extruding and embedding the electric heating wire on a saddle-shaped arc welding surface of the pipeline connecting part; (3) the bypass main body is bound on the main gas pipeline, the electric heating wire is electrified, the electric heating wire heats to melt the material at the saddle-shaped arc welding surface, and the bypass main body and the main gas pipeline are welded together. The invention can reduce the uneven distortion of temperature by the elliptical spiral wire distribution, and can control the residual distortion by the temperature control shape memory alloy.)

1. The method for regulating and controlling the welding thermal deformation of the electric smelting bypass saddle-shaped pipe fitting is characterized by comprising the following steps of:

(1) the bypass main body is injection-molded by adopting a plastic injection molding process, and the temperature-control shape memory alloy is embedded inside the bypass main body in the injection molding process of the bypass main body:

the bypass main body comprises a drilling pipeline and a bypass branch pipe communicated with the drilling pipeline, a saddle-shaped pipeline connecting part is arranged at one end of the drilling pipeline, the temperature control shape memory alloy is embedded in the pipeline connecting part, the thermal deformation direction of the temperature control shape memory alloy is opposite to the thermal stress deformation direction of the pipeline connecting part, the pipeline connecting part is provided with a saddle-shaped arc welding surface, and a pipe hole is formed in the saddle-shaped arc welding surface of the drilling pipeline;

(2) the electric heating wire is extruded and embedded on the saddle-shaped arc welding surface of the pipeline connecting part:

the heating wires are arranged in an elliptical spiral line form, and the long axis of the elliptical spiral line is parallel to the axial direction of a main gas pipeline welded with the pipeline connecting part;

(3) the bypass main body is bound on the main gas pipeline, the electric heating wire is electrified, the electric heating wire heats to melt the material at the saddle-shaped arc welding surface, and the bypass main body and the main gas pipeline are welded together.

2. The electric smelting bypass saddle pipe fitting welding thermal deformation regulating and controlling method according to claim 1, wherein a wire distance of the electric heating wire along the circumferential direction of the main gas pipeline is x, a wire distance of the electric heating wire along the axial direction of the main gas pipeline is y, x is more than or equal to 0.5mm and less than or equal to 3.5mm, and x is more than or equal to 0.8 and less than 1.0.

3. The method for regulating and controlling the welding thermal deformation of the electric smelting bypass saddle-shaped pipe fitting according to claim 1, wherein the number of the winding turns of the electric heating wire is n, and n is more than or equal to 15 turns and less than or equal to 40 turns.

4. The method of claim 1, wherein the plurality of temperature-controlled shape memory alloys are embedded around the tubular hole, and the plurality of temperature-controlled shape memory alloys are symmetrically disposed about the tubular hole.

Technical Field

The invention belongs to the technical field of welding thermal deformation regulation and control, and particularly relates to a self-adaptive control method for welding thermal deformation of an electric smelting bypass saddle-shaped pipe fitting.

Background

Natural gas is one of clean and efficient energy sources in cities, and the most convenient conveying mode is pipeline conveying. Compared with metal gas transmission and distribution pipelines, the Polyethylene (PE) gas pipeline has the comprehensive advantages of stable mechanical property, chemical corrosion resistance, weldability, environmental protection, long service life, light weight, easy processing and forming, low transportation and installation cost and the like, has the popularization rate of over 90 percent in the countries such as British, Denmark, France and the like, and is also popularized and applied in large quantities in newly built medium-pressure and low-pressure gas transmission and distribution pipelines in China. However, one of the important problems in the practical use of the pipeline made of the material is the technical problem of connecting the operated pipeline with the newly-built branch pipeline. According to the requirements of CJJ63-2018 polyethylene gas pipeline engineering technical standard, PE gas pipeline connection adopts electric melting connection (electric melting bearing connection and electric melting saddle connection) or hot melting connection, and threaded connection and bonding are not adopted. The electric smelting bypass saddle-shaped connection is a common mode in the gas pipeline pressure-bearing non-stop connection.

The structural parts of the conventional PE electric melting bypass saddle-shaped pipe fitting (saddle pipe for short) comprise an electric melting cover cap, a sealing ring, a bypass main body, a drilling tool, a tool support body and electric heating wires, wherein the wires of the electric heating wires on the saddle pipe are circular wires on a spatial cylindrical surface, and the wire distances of the electric heating wires in all directions are the same. The method for connecting the main gas pipeline with pressure without stopping gas comprises the following working principles: firstly, the saddle pipe is bound on a main gas pipeline, at the moment, the electric heating wire is electrified, the electric heating wire generates heat to melt PE materials to enable the saddle pipe and the main gas pipeline to be welded together, gas-uninterrupted tapping under pressure is needed after welding is completed, at the moment, a drilling tool descends through thread fit rotation and drills a hole on the main gas pipeline, sealing rings are guaranteed to seal all leakage channels between the tool and a tool support body, between the tool support body and a bypass main body in the process, the tool is screwed up after a hole is drilled, and an electric melting cap is covered, so that the gas-uninterrupted tapping under pressure is completed.

PE electric smelting bypass saddle pipe fitting among the prior art has following problem: the welding quality of the saddle pipe and the main pipeline is poor due to the uneven deformation caused by uneven temperature distribution in the fusion welding process, and the defects of cracks and the like can occur at the welding seam, so that the gas leakage is caused.

Disclosure of Invention

The invention aims to solve the technical problems and provides a self-adaptive control method for welding thermal deformation of an electric smelting bypass saddle-shaped pipe fitting.

In order to achieve the purpose, the invention adopts the following technical scheme:

a welding thermal deformation regulation and control method for an electric smelting bypass saddle-shaped pipe fitting comprises the following steps:

(1) the bypass main body is injection-molded by adopting a plastic injection molding process, and the temperature-control shape memory alloy is embedded inside the bypass main body in the injection molding process of the bypass main body:

the bypass main body comprises a drilling pipeline and a bypass branch pipe communicated with the drilling pipeline, a saddle-shaped pipeline connecting part is arranged at one end of the drilling pipeline, the temperature control shape memory alloy is embedded in the pipeline connecting part, the thermal deformation direction of the temperature control shape memory alloy is opposite to the thermal stress deformation direction of the pipeline connecting part, the pipeline connecting part is provided with a saddle-shaped arc welding surface, and a pipe hole is formed in the saddle-shaped arc welding surface of the drilling pipeline;

(2) the electric heating wire is extruded and embedded on the saddle-shaped arc welding surface of the pipeline connecting part:

the heating wires are arranged in an elliptical spiral line form, and the long axis of the elliptical spiral line is parallel to the axial direction of a main gas pipeline welded with the pipeline connecting part;

(3) the bypass main body is bound on the main gas pipeline, the electric heating wire is electrified, the electric heating wire heats to melt the material at the saddle-shaped arc welding surface, and the bypass main body and the main gas pipeline are welded together.

Preferably, the wire distance of the electric heating wire along the circumferential direction of the main gas pipeline is x, the wire distance of the electric heating wire along the axial direction of the main gas pipeline is y, x is more than or equal to 0.5mm and less than or equal to 3.5mm, and x is more than or equal to 0.8 and less than 1.0.

Preferably, the number of winding turns of the electric heating wire is n, and n is more than or equal to 15 turns and less than or equal to 40 turns.

Preferably, the temperature-controlled shape memory alloy is embedded around the pipe hole, and the plurality of temperature-controlled shape memory alloys are symmetrically arranged around the pipe hole.

After the technical scheme is adopted, the invention has the following advantages:

according to the electric melting bypass saddle-shaped pipe fitting welding thermal deformation regulation and control method, the heating wires are arranged in the form of the elliptical spiral line, and the elliptical wire arrangement can homogenize the temperature field distribution, because the wire pitch of the heating wires arranged in the form of the elliptical spiral line is changed, the temperature is reduced when the wire pitch is increased, and the temperature is increased when the wire pitch is reduced, so that the temperature homogenization can be realized through the wire pitch change control arranged in the form of the elliptical spiral line. This improves the quality of the weld and also reduces uneven thermal stress deformation. In addition, the prior advanced intelligent material temperature control shape memory alloy is arranged near the saddle-shaped arc welding surface of the electric smelting bypass saddle-shaped pipe fitting, the temperature rises during welding, the temperature control shape memory alloy generates deformation stress along with the temperature according to the pre-designed direction, the deformation stress of the memory alloy can counteract the thermal stress during welding, the temperature returns to normal temperature after welding is completed, and the deformation stress of the memory alloy disappears, so that the shape is controlled. Therefore, the invention can reduce the distortion of uneven temperature by the elliptical spiral wire arrangement and control the residual distortion by the temperature control shape memory alloy.

Drawings

FIG. 1 is a schematic structural diagram of an electric melting bypass saddle pipe fitting capable of adaptively controlling welding thermal deformation;

FIG. 2 is an exploded view of an electrofusion bypass saddle pipe fitting with adaptive control of welding thermal deformation;

FIG. 3 is a cross-sectional view of an electrofusion bypass saddle pipe fitting with adaptive control of welding thermal distortion;

FIG. 4 is a schematic view of the structure at the saddle-shaped arc welding surface;

FIG. 5 is a schematic view of a temperature controlled shape memory alloy and wire arrangement;

in the figure:

1-a main gas pipeline; 2-a bypass body; 21-drilling a pipeline; 211-a pipe connection; 2111-saddle arc welding surface; 212-pore of pipe; 213-tool holder support groove; 22-a bypass branch; 3-drilling a cutter; 4-a tool holder; 41-a circular cylinder I; 42-a circular cylinder II; 43-circular cylinder three; 44-cylindrical grooves; 5-a bypass cap; 7-a first sealing ring; 8-a second sealing ring; 9-a third sealing ring; 10-a fourth seal ring; 11-a fifth sealing ring; 15-electric heating wire; 16-temperature controlled shape memory alloy; 17-welding wire.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific examples.

A welding thermal deformation regulation and control method for an electric smelting bypass saddle-shaped pipe fitting comprises the following steps:

(1) the bypass main body is injection-molded by adopting a plastic injection molding process, and the temperature-control shape memory alloy is embedded inside the bypass main body in the injection molding process of the bypass main body:

the bypass main body comprises a drilling pipeline and a bypass branch pipe communicated with the drilling pipeline, a saddle-shaped pipeline connecting part is arranged at one end of the drilling pipeline, the temperature control shape memory alloy is embedded in the pipeline connecting part, the thermal deformation direction of the temperature control shape memory alloy is opposite to the thermal stress deformation direction of the pipeline connecting part, the pipeline connecting part is provided with a saddle-shaped arc welding surface, and a pipe hole is formed in the saddle-shaped arc welding surface of the drilling pipeline;

(2) the electric heating wire is extruded and embedded on the saddle-shaped arc welding surface of the pipeline connecting part:

the heating wires are arranged in an elliptical spiral line form, and the long axis of the elliptical spiral line is parallel to the axial direction of a main gas pipeline welded with the pipeline connecting part;

(3) the bypass main body is bound on the main gas pipeline, the electric heating wire is electrified, the electric heating wire heats to melt the material at the saddle-shaped arc welding surface, and the bypass main body and the main gas pipeline are welded together.

In the step (2), the wire distance of the electric heating wire along the circumferential direction of the main gas pipeline is x, x is more than or equal to 0.5mm and less than or equal to 3.5mm along the axial direction of the main gas pipeline, and x is more than or equal to 0.8 and less than 1.0.

In the step (2), the number of winding turns of the electric heating wire is n, and n is not less than 15 turns and not more than 40 turns.

In the step (1), a plurality of temperature-controlled shape memory alloys are arranged, the temperature-controlled shape memory alloys are embedded around the pipe hole, and the plurality of temperature-controlled shape memory alloys are symmetrically arranged around the pipe hole.

An electrofusion bypass saddle-shaped pipe fitting welded with a main gas pipeline 1 according to the method and capable of adaptively controlling welding thermal deformation is shown in figures 1-5 and comprises a bypass main body 2, a drilling tool 3, a tool bracket 4 and a bypass cap 5.

The bypass body 2 includes a bore pipe 21 and a bypass branch pipe 22 communicating with the bore pipe 21. In this embodiment, the drill pipe 21 and the bypass branch pipe 22 are integrally provided.

One end of the drilling pipeline 21 is provided with a saddle-shaped pipeline connecting part 211, the pipeline connecting part 211 is provided with a saddle-shaped arc welding surface 2111, and a pipe hole 212 is formed in the saddle-shaped arc welding surface 2111 of the drilling pipeline 21; the other end of the drilling pipe 21 is provided with the drilling tool 3, a tool carrier 4 and a bypass cap 5.

The drilling tool 3 is installed on the tool bracket 4, the tool bracket 4 is provided with a cylindrical groove 44 which is through from top to bottom, and the wall of the cylindrical groove 44 is provided with a thread for connecting the drilling tool 3.

The mouth of pipe department of drilling pipeline 21 is equipped with round cutter bracket and supports groove 213, cutter bracket 4 is including the ring cylinder one 41, two 42 and three 43 of ring cylinder that from top to bottom set gradually. The diameter of the first annular cylinder 41 is matched with that of the cutter bracket supporting groove 213; the diameter of the second circular cylinder 42 is matched with the inner diameter of the drilling pipeline 21; the diameter of the circular ring cylinder three 43 is smaller than the inner diameter of the drill pipe 21. A circle of first sealing ring mounting groove is formed in the first circular cylinder 41, and a first sealing ring 7 is mounted in the first sealing ring mounting groove; and a circle of second sealing ring mounting groove is formed in the second circular cylinder 42, and a second sealing ring 8 is mounted in the second sealing ring mounting groove.

The cross section of the bypass cover cap 5 is concave, and the bypass cover cap 5 is in gapless fit with the cutter bracket 4 and the drilling pipeline 21. And a circle of third sealing ring mounting groove is formed in the bottom surface inside the bypass cover cap 5, and a third sealing ring 9 is mounted in the third sealing ring mounting groove.

The drilling tool 3 is provided with a circle of fourth sealing ring mounting groove and a circle of fifth sealing ring mounting groove respectively on the upper part and the lower part of the cylindrical surface matched with the cylindrical groove 44, and a fourth sealing ring 10 and a fifth sealing ring 11 are respectively mounted in the fourth sealing ring mounting groove and the fifth sealing ring mounting groove.

The saddle-shaped arc welding surface 2111 is provided with an electric heating wire 15 arranged in the form of an elliptical spiral line, and the long axis of the elliptical spiral line is parallel to the axial direction of the main gas pipeline 1. The wire distance of the heating wires 15 along the circumferential direction of the main gas pipeline 1 is x, the wire distance of the heating wires 15 along the axial direction of the main gas pipeline 1 is y, x is larger than or equal to 0.5mm and smaller than or equal to 3.5mm, and x is larger than or equal to 0.8 and smaller than 1.0. In this example, x is 1.0mm, and x is 0.8.

Furthermore, the number of winding turns of the electric heating wire 15 is n, and n is not less than 15 turns and not more than 40 turns. The diameter of the electric heating wire 15 is d, and d is more than or equal to 0.3mm and less than or equal to 1.0 mm. In this embodiment, the number of turns n of the heating wire 15 is 20, and the diameter d of the heating wire 15 is 0.8 mm. The bypass main body 2 is a PE pipe, and the heating wire 15 is pressed and embedded into the saddle-shaped arc welding surface 2111 of the pipe connecting portion 211 by a machine tool.

The pipe connecting part 211 is embedded with a temperature-controlled shape memory alloy 16 around the pipe hole 212, and the thermal deformation direction of the temperature-controlled shape memory alloy 16 is opposite to the thermal stress deformation direction of the pipe connecting part 211. The temperature-controlled shape memory alloy 16 is embedded in the bypass main body 2 in the injection molding process of the bypass main body 2.

Preferably, there are a plurality of temperature controlled shape memory alloys 16, and a plurality of temperature controlled shape memory alloys 16 are symmetrically disposed about the orifice 212. In this embodiment, the bypass body 2 is embedded with the temperature-controlled shape-memory alloy 16 and the welding wire 17 around the pipe hole 212. The temperature control shape memory alloy 16 is strip-shaped, and the temperature control shape memory alloy 16 is parallel to the axial direction of the main gas pipeline 1. Two of the temperature controlled shape memory alloys 16 are provided and two of the temperature controlled shape memory alloys 16 are symmetrically disposed about the orifice 212. The welding wires 17 are perpendicular to the axial direction of the main gas pipeline 1, and two welding wires 17 are arranged on the welding wires 17 and are symmetrical relative to the pipe hole 212.

The method for connecting the electric smelting bypass saddle-shaped pipe fitting with the main gas pipeline 1 under pressure without stopping gas and the working principle are as follows: firstly, bind electric smelting bypass saddle pipe fitting on main gas pipeline 1, at this moment through electrifying heating wire 15, heating wire 15 generates heat and melts PE material and makes electric smelting bypass saddle pipe fitting and main gas pipeline 1 melt-weld together, need take pressure not to stop the gas trompil after the welding is accomplished, drilling tool 3 descends and bores the trompil on main gas pipeline 1 through screw-thread fit rotation this moment, all leak paths between this process drilling tool 3 and cutter bracket 4, cutter bracket 4 and bypass main part 2 all guarantee that the sealing washer is sealed, drilling tool 3 revolves up after the hole is bored, lid bypass block 5, thereby accomplish and take pressure not to stop the gas trompil.

In the invention, the heating wires are arranged in the form of the elliptical spiral line, and the elliptical wire arrangement can homogenize the temperature field distribution, because the wire distance of the heating wires arranged in the form of the elliptical spiral line is changed, the temperature can be reduced when the wire distance is increased, and the temperature can be increased when the wire distance is reduced, so that the temperature homogenization can be realized by controlling the change of the wire distance arranged in the form of the elliptical spiral line. This improves the quality of the weld and also reduces uneven thermal stress deformation. In addition, the prior advanced intelligent material temperature control shape memory alloy is arranged near the saddle-shaped arc welding surface of the electric smelting bypass saddle-shaped pipe fitting, the temperature rises during welding, the temperature control shape memory alloy generates deformation stress along with the temperature according to the pre-designed direction, the deformation stress of the memory alloy can counteract the thermal stress during welding, the temperature returns to normal temperature after welding is completed, and the deformation stress of the memory alloy disappears, so that the shape is controlled. Therefore, the invention can reduce the distortion of uneven temperature by the elliptical spiral wire arrangement and control the residual distortion by the temperature control shape memory alloy.

Other embodiments of the present invention than the preferred embodiments described above will be apparent to those skilled in the art from the present invention, and various changes and modifications can be made therein without departing from the spirit of the present invention as defined in the appended claims.