CN115091769A - Electric fusion welding method for reinforced thermoplastic RTP (real time processing) pipe - Google Patents
Electric fusion welding method for reinforced thermoplastic RTP (real time processing) pipe Download PDFInfo
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- CN115091769A CN115091769A CN202210730089.1A CN202210730089A CN115091769A CN 115091769 A CN115091769 A CN 115091769A CN 202210730089 A CN202210730089 A CN 202210730089A CN 115091769 A CN115091769 A CN 115091769A
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- Prior art keywords
- electric
- welding
- rtp
- heating wire
- reinforced thermoplastic
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- 238000003466 welding Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 27
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 17
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 17
- 230000004927 fusion Effects 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 238000005485 electric heating Methods 0.000 claims abstract description 28
- 238000002844 melting Methods 0.000 claims abstract description 23
- 230000008018 melting Effects 0.000 claims abstract description 23
- 229910001120 nichrome Inorganic materials 0.000 claims description 7
- 238000010276 construction Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000004698 Polyethylene Substances 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- 229910018487 Ni—Cr Inorganic materials 0.000 description 4
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
- B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/02—Welded joints; Adhesive joints
- F16L47/03—Welded joints with an electrical resistance incorporated in the joint
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
The invention discloses an electric fusion welding method of a reinforced thermoplastic RTP pipe, belonging to the field of electric fusion welding and comprising the following steps: step one, selecting an electric heating wire, an electric melting sleeve, an RTP pipe and an electric welding machine; step two: placing an electric heating wire between the electric melting sleeve and the RTP pipe, and applying voltage to two ends of the electric heating wire in a manner of matching with an electric welding machine; step three: starting welding, controlling the voltage of an electric fusion welding motor according to the length difference of the electric heating wires, and controlling the temperature change of the electric heating wires; step four: until the welding is completed. Can have more stable rate of heating, convenient in the mobile construction of the colleague of guaranteeing spot welding stability and use convenience, can adapt to more work drawing frames (the narrow, the big section of slope of trench etc.), select the parameter just can the direct welding, easy and simple to handle to reduce the defect production in RTP union coupling department welding process, reduce the potential safety hazard.
Description
Technical Field
The invention relates to the technical field of electric fusion welding, in particular to an electric fusion welding method of a reinforced thermoplastic RTP pipe.
Background
RTP pipeline connection mainly has two kinds of modes of electric smelting and hot melting: the cost is lower than that of electric hot melting; and the quality of the electric melting is better than that of the electric melting welding method in the hot melting.
The electric fusion welding is developed and popularized fast due to simple construction operation, light field equipment and high welding speed. Research has shown that the welding process is a key factor in determining the strength of RTP electrofusion joints. The main welding process parameters influencing the strength of the electric melting joint comprise input voltage, the resistance value of the unit length of a fusion zone, the width of a heating zone of an electric heating wire, welding time and the like.
In the existing construction process, various defects are inevitably generated at the joint of the connector due to the influence of various factors, so that the connector becomes a weak link of an RTP pipeline system, and potential safety hazards are brought to the use of pipelines.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an electric fusion welding method of a reinforced thermoplastic RTP pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of electrofusion welding of reinforced thermoplastic RTP tubes comprising the steps of:
step one, selecting an electric heating wire, an electric melting sleeve, an RTP pipe and an electric welding machine;
step two: placing an electric heating wire between the electric melting sleeve and the RTP pipe, and applying voltage to two ends of the electric heating wire in a manner of matching with an electric welding machine;
step three: starting welding, controlling the voltage of an electric fusion welding motor according to the length difference of the electric heating wires, and controlling the temperature change of the electric heating wires;
step four: until the welding is completed.
Further, in the first step, the heating wire is a nichrome heating wire with a grade of Cr20Ni 80.
Further, in the first step, a hot wire with the wire diameter of 1-3mm is selected.
Further, in the step one, the electric welding machine is an electric melting welding machine.
And further, in the second step, the electric heating wire is wound on the outer wall of the RTP pipe, and two ends of the electric heating wire penetrate through the electric melting sleeve and are connected with the electrodes.
Further, in the second step, the voltage connected to the two ends of the electric heating wire is constant.
Further, for the third step, the constant voltage can be reversely estimated by the required final temperature before being electrified and adjusted, and the expression of heating to the final temperature T is as follows:
wherein, t-time, U-voltage, R-resistance omega/m, c-specific heat J/kg. ℃, m-weight of the electric heating wire per hundred meters kg/100 m.
Compared with the prior art, the invention has the beneficial effects that: can have more stable rate of heating, adopt the cooperation of nichrome heating wire and electric smelting electric welding machine, can have high strength in high temperature environment, long-term high temperature during operation non-deformable, also can keep stronger hardness at the in-process of connecting, and cooperation electric smelting electric welding machine that can be better, it is convenient in the mobile construction to guarantee spot welding stability and the coworker of use convenience, can adapt to more work picture frames (the pipe chase is narrow, the big section of slope, etc.), it just can the lug weld to select the parameter, the operation is simple and convenient, and reduce the defect production in the RTP union coupling department welding process, the potential safety hazard is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flow chart illustrating the steps of the proposed method for electrofusion welding of reinforced thermoplastic RTP tubes;
FIG. 2 is a schematic view of the weld joint of the reinforced thermoplastic RTP tube according to the present invention;
fig. 3 is a cross-sectional view of an electrofusion joint for a method of electrofusion welding of reinforced thermoplastic RTP tubing in accordance with the present invention.
In the figure: 1. an electric heating wire; 2. electrically melting the sleeve; 3. RTP tube 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Referring to fig. 1-3, a method of electrofusion welding of reinforced thermoplastic RTP tubes includes the steps of:
step S101: selecting an electric heating wire 1, an electric melting sleeve 2, an RTP pipe 3 and an electric welding machine;
step S103: placing an electric heating wire 1 between an electric melting sleeve 2 and an RTP pipe 3, and applying voltage to two ends of the electric heating wire 1 in a manner of matching with an electric welding machine;
step S105: starting welding, controlling the voltage of the electric fusion welding motor according to the length difference of the electric heating wire 1, and controlling the temperature change of the electric heating wire 1;
step S107: until the welding is completed.
In the specific embodiment of the present application, for the step S101, the heating wire 1 is a nichrome heating wire 1, and the selected brand is Cr20Ni 80.
Specifically, the nichrome heating wire 1 has high strength in a high-temperature environment, is not easy to deform during long-term high-temperature work, has a high use temperature and a high resistivity, and the melting point of the high-density polyethylene is 126 to 136 ℃, and the nichrome heating wire 1 is preferentially adopted.
More specifically, the heating wire 1 of the mark Cr20Ni80 has a maximum use temperature of 1200 deg.C, a resistivity of 1.09 + -0.05 μ Ω & m at room temperature of 20 deg.C, and a density of 8.40g/cm 3 The heat conductivity coefficient is 60.3KJ/m.h ℃, the specific heat is 0.440J/g DEG C, the melting point is 1400 ℃, the elongation is more than or equal to 20 percent, and the coating is attached to an indoor use environment.
In the embodiment of the present application, a hot wire with a wire diameter of 1-3mm is selected for use in step S101.
In a specific embodiment of the present application, for step S101, the electric welding machine is an electric melting welding machine.
In the embodiment of the present application, for use in step S103, the heating wire 1 is wound around the outer wall of the RTP tube 3, and two ends of the heating wire 1 penetrate through the electrofusion sleeve 2 and are connected to the electrodes.
In the specific embodiment of the present application, in step S103, the voltage applied to the two ends of the heating wire 1 is a constant voltage.
In the specific embodiment of the present application, for use in step S105, the constant voltage may be back-estimated by the desired final temperature before energization, and adjusted, and the expression for heating to the final temperature T is:
wherein t-time s, U-voltage V, R-resistance omega/m, c-specific heat J/g DEG C, m-weight per hundred meters of the electric heating wire 1 kg/m.
Specifically, the relationship between the length, the wire diameter, the voltage and the heat generation temperature of the hot wire is calculated by using the Cr20Ni80 hot wire. Because of being composed of
In a clear view of the above, it is known that,
the room temperature is 20 ℃, so the final temperature is reachedT is expressed as
In order to better understand the technical scheme of the invention, the following is further explained by combining experimental data.
Experiment of
A Cr20Ni 80-grade nickel-chromium wire is selected, the wire diameter of the nickel-chromium wire is 1mm, and the electric welding machine is an electric melting electric welding machine.
Under the condition that the wire diameter of the nickel-chromium wire is 1 mm:
the weight of each meter of the nickel-chromium wire is 0.00659728kg/m, the resistance of each meter is 1.41 omega/m, the specific heat is 0.440J/g DEG C at 20 ℃, and the method is deduced according to a formula;
the specific data are shown in Table 1.
TABLE 1
It can be known from the above that, by adding a constant voltage at two ends of the heating electric wire 1, the joule effect of the electric wire 1 is utilized to generate heat to melt and bond the sleeve and the polyethylene near the wall surface of the pipe together, the temperature of the electric wire 1 rises rapidly after welding starts, the input power drops rapidly because the effective value of the welding voltage remains unchanged, when the resistance temperature rises continuously along with the progress of the welding process, the input power also drops continuously along with the continuation, the temperature of the welding power is nonlinear, the polyethylene gradually softens to be completely melted along with the rise of the temperature of a welding interface, the thermal conductivity and the density of the polyethylene in the process are gradually reduced along with the temperature, the specific heat capacity is rapidly raised near the melting temperature, the polyethylene returns to be close to the original value after being completely melted, the polyethylene in the inner layer expands by heating, so that the pressure in the melting area rises, the contact thermal conductance of the heating wire 1 with the polyethylene increases as the pressure of the contact interface increases.
That is, changing the wire diameter of the hot wire has little effect on the time to heat to the desired temperature; the change of the length of the hot wire has great influence, and the increase of the length can prolong the heating time; the voltage is also great to the heat time influence of heater, and voltage is higher, and heat time will become shorter more to learn 1 temperature of heating wire and change in certain extent, nichrome heating wire 1 can rapid heating up during the start-up, and can use less line footpath to come different welding environment and the welding flow of laminating.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A method of electrofusion welding of reinforced thermoplastic RTP tubes, comprising the steps of:
selecting an electric heating wire (1), an electric melting sleeve (2), an RTP (real time process) pipe (3) and an electric welding machine;
step two: placing an electric heating wire (1) between an electric melting sleeve (2) and an RTP pipe (3), and applying voltage to two ends of the electric heating wire (1) in a manner of matching with an electric welding machine;
step three: starting welding, controlling the voltage of the electric fusion welding motor according to the length difference of the electric heating wire (1), and controlling the temperature change of the electric heating wire (1);
step four: until the welding is completed.
2. A method for electrofusion welding of reinforced thermoplastic RTP tubes as in claim 1, characterized in that in step one, the heating wire (1) is a nichrome heating wire (1) with the designation Cr20Ni 80.
3. A method of electrofusion welding of reinforced thermoplastic RTP tubes as in claim 1, wherein in step one, a hot wire with a wire diameter of 1-3mm is selected.
4. A method of electrofusion welding of reinforced thermoplastic RTP tubes as in claim 1 wherein, in step one, the electric welder is an electric fusion welder.
5. A method for electrofusion welding of RTP tubes of reinforced thermoplastic according to claim 1, characterised in that in step two, the heating wire (1) is wound around the outer wall of the RTP tube (3), and both ends of the heating wire (1) are passed through the electrofusion sleeve (2) and connected to the electrodes.
6. The electrofusion welding method for reinforced thermoplastic RTP tubes as in claim 1, characterised in that, in step two, the voltage applied across the heating wire (1) is constant.
7. An electrofusion welding process for reinforced thermoplastic RTP tubes as in claim 6, characterised in that for step three, the constant voltage is back-estimated by the desired final temperature before energisation and adjusted, the expression for heating to final temperature T is:
wherein, t-time, U-voltage, R-resistance omega/m, c-specific heat J/kg. ℃, m-weight of the electric heating wire (1) per hundred meters kg/100 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210730089.1A CN115091769A (en) | 2022-06-24 | 2022-06-24 | Electric fusion welding method for reinforced thermoplastic RTP (real time processing) pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210730089.1A CN115091769A (en) | 2022-06-24 | 2022-06-24 | Electric fusion welding method for reinforced thermoplastic RTP (real time processing) pipe |
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| Publication Number | Publication Date |
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| CN115091769A true CN115091769A (en) | 2022-09-23 |
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| CN202210730089.1A Pending CN115091769A (en) | 2022-06-24 | 2022-06-24 | Electric fusion welding method for reinforced thermoplastic RTP (real time processing) pipe |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201246570Y (en) * | 2008-07-04 | 2009-05-27 | 捷流技术工程(广州)有限公司 | Fast electric melting pipe fittings |
| CN107289220A (en) * | 2016-03-30 | 2017-10-24 | 青海柴达木杰青科技有限公司 | A kind of enhanced composite electric melting sleeve and preparation method thereof |
| CN109827019A (en) * | 2019-01-16 | 2019-05-31 | 浙江大学 | A kind of polyethylene fused pipe considering resistance wire wiring area length |
| CN110789133A (en) * | 2019-10-17 | 2020-02-14 | 浙江大学 | Melting zone control method based on real-time temperature field data of electric melting joint |
| CN112223758A (en) * | 2020-09-29 | 2021-01-15 | 安源管道实业股份有限公司 | Butt welding connection and construction method for steel skeleton plastic composite pipes |
-
2022
- 2022-06-24 CN CN202210730089.1A patent/CN115091769A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201246570Y (en) * | 2008-07-04 | 2009-05-27 | 捷流技术工程(广州)有限公司 | Fast electric melting pipe fittings |
| CN107289220A (en) * | 2016-03-30 | 2017-10-24 | 青海柴达木杰青科技有限公司 | A kind of enhanced composite electric melting sleeve and preparation method thereof |
| CN109827019A (en) * | 2019-01-16 | 2019-05-31 | 浙江大学 | A kind of polyethylene fused pipe considering resistance wire wiring area length |
| CN110789133A (en) * | 2019-10-17 | 2020-02-14 | 浙江大学 | Melting zone control method based on real-time temperature field data of electric melting joint |
| CN112223758A (en) * | 2020-09-29 | 2021-01-15 | 安源管道实业股份有限公司 | Butt welding connection and construction method for steel skeleton plastic composite pipes |
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