CN110340501A - A kind of natural gas line welding procedure method - Google Patents
A kind of natural gas line welding procedure method Download PDFInfo
- Publication number
- CN110340501A CN110340501A CN201910649071.7A CN201910649071A CN110340501A CN 110340501 A CN110340501 A CN 110340501A CN 201910649071 A CN201910649071 A CN 201910649071A CN 110340501 A CN110340501 A CN 110340501A
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- China
- Prior art keywords
- welding
- pipe fitting
- natural gas
- gas line
- procedure method
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
Abstract
The invention discloses be related to natural gas line welding technology field, disclose a kind of natural gas line welding procedure method, it is high in order to solve existing pipeline welding technique residual stress, the problem of being easy to appear desoldering phenomenon is successively fixed, is preheated using pipe fitting pretreatment, pipe fitting, pipe fitting welding, heat treatment procedure.It is simple with principle, effect easy to operate, the residual stress of pipe fitting welded seam area can be effectively reduced by preheating cooperation heat treatment, improve the total bearing capacity in pipe fitting welding region, it avoids the problem that pipe fitting is caused to generate fire check and cold crack because of temperature, it ensure that the safety of pipe fitting conveying natural gas, the rigidity of pipe fitting is improved simultaneously, avoid the problem that occurring brittle failure at low temperature, two pipe fittings can be fixed by tack welding, avoid the problem that deformation occurs because temperature leads to entirety in welding, guarantees the planarization of pipe fitting.
Description
Technical field
The present invention relates to natural gas line welding technology field, specifically a kind of natural gas line welding procedure method.
Background technique
Natural gas refers to a naturally occurring tangential gas in nature, including in atmospheric thermodynamics, hydrosphere and lithosphere it is various from
The gas that right process is formed, natural gas need to use pipeline in conveying, and pipeline needs to use welding when setting up to assemble.
But natural gas line welding at present does not eliminate the residual stress after it is welded, so that remnants are answered
Power impacts the rigidity and bearing capacity of pipe fitting, is easy to appear desoldering phenomenon, while without using tack welding, can not be to pipe fitting
Welding is positioned, thus the problem of leading to deformation because of high temperature.Therefore, those skilled in the art provide a kind of natural gas line
Welding procedure method, to solve the problems mentioned in the above background technology.
Summary of the invention
The purpose of the present invention is to provide a kind of natural gas line welding procedure methods, to solve to mention in above-mentioned background technique
Out the problem of.
To achieve the above object, the invention provides the following technical scheme: a kind of natural gas line welding procedure method, including
Step in detail below:
S1, pipe fitting pretreatment: pipe fitting of two detector for outer diameter error ranges between -0.1%~+0.2% is selected；Apart from nozzle
It derusts at 50mm, makes its surface in shape metallic luster；Nozzle position need to polish groove group pair, while in 1.5~2.0mm
Interior root face polishing；
S2, pipe fitting are fixed, are preheated: being fixed pipe fitting by auxiliary locating tool equipment, while being used heating equipment line up
Local preheating is carried out within the scope of 100mm；
S3, pipe fitting welding: being fixed by tack welding line up first, is secondly carried out using on the inside of argon arc welding line up
Back cover welding, is finally successively filled weldering and cosmetic welding in line up welding section using manual arc welding；
S4, heat treatment: winding heating plate in weld seam two sides centered on weld seam, using three thermocouples along pipe fitting radial direction
Each 120 ° of directions installation, it is ensured that the head of thermocouple is close to the weld seam zone of influence and is tightly attached to tube surface, while in the outer of pipe fitting
Surface package heat-preservation cotton is kept the temperature, and heating plate is begun to warm up after energization, and constant temperature protection and cooling processing are carried out after heating, cooling
After knock out welding zone epidermis and complete a whole set of welding sequence.
As further scheme of the invention: the opening width of groove is 12mm~15mm in the S1, and between groove
Gap ensures between 1mm~3mm, while nozzle outer end must not have the Notch damage greater than 0.5mm.
As further scheme of the invention: the heating equipment in the S2 uses flame preheater, blowtorch, crawler type
Any one in heater or rope type heater, preheating temperature is maintained at 120~180 DEG C.
As further scheme of the invention: tack welding solder joint must not be less than at 4 points in the S3, be uniformly distributed in pipe
12 points, 3 points, 6 points of part and 9 o'clock direction, and the length of tack welding guarantees in 15~20mm, 2~4mm of height, while not
Obtain 2/3 more than tube wall thickness.
As the present invention further scheme: the gage of wire of argon arc welding is 2~2.5mm in the S3, and argon arc welding
Electric current, voltage and gas flow parameter be respectively 80~100A, 12V, 8~10L/min.
As further scheme of the invention: the heat-preservation cotton in the S4 uses the component of alumina silicate fibre material, and
The size of heat-preservation cotton is 50 × 600mm.
As further scheme of the invention: the heating rate of the heating in the S4 uses 170 DEG C/h, is heated to 260
DEG C or more when, using 180 × 25/T (DEG C/h), soaking time T/25h, rate of temperature fall is using 230 × 25/T (DEG C/h), 250
DEG C or less can natural cooling.
Compared with prior art, easy to operate the beneficial effects of the present invention are: the principle of the invention is simple, matched by preheating
The residual stress of pipe fitting welded seam area can be effectively reduced by closing heat treatment, improve the total bearing capacity in pipe fitting welding region,
It avoids the problem that pipe fitting is caused to generate fire check and cold crack because of temperature, ensure that the safety of pipe fitting conveying natural gas, simultaneously
The rigidity for improving pipe fitting, avoids the problem that occurring brittle failure at low temperature, two pipe fittings can be fixed by tack welding,
Avoid the problem that deformation occurs because temperature leads to entirety in welding, guarantees the planarization of pipe fitting.
Detailed description of the invention
The step of Fig. 1 is a kind of natural gas line welding procedure method is schemed；
Fig. 2 is circumferential stress detection data figure in a kind of natural gas line welding procedure method；
Fig. 3 is axial stress mornitoring datagram in a kind of natural gas line welding procedure method.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1:
Please refer to Fig. 1~3, in the embodiment of the present invention, a kind of natural gas line welding procedure method, including walk in detail below
It is rapid:
S1, pipe fitting pretreatment: pipe fitting of two detector for outer diameter error ranges between -0.1%~+0.2% is selected；Apart from nozzle
It derusts at 50mm, makes its surface in shape metallic luster；Nozzle position need to polish groove group pair, while in 1.5~2.0mm
Interior root face polishing；
S2, pipe fitting are fixed, are preheated: being fixed pipe fitting by auxiliary locating tool equipment, while being used heating equipment line up
Local preheating is carried out within the scope of 100mm；
S3, pipe fitting welding: being fixed by tack welding line up first, is secondly carried out using on the inside of argon arc welding line up
Back cover welding, is finally successively filled weldering and cosmetic welding in line up welding section using manual arc welding；
S4, heat treatment: winding heating plate in weld seam two sides centered on weld seam, using three thermocouples along pipe fitting radial direction
Each 120 ° of directions installation, it is ensured that the head of thermocouple is close to the weld seam zone of influence and is tightly attached to tube surface, while in the outer of pipe fitting
Surface package heat-preservation cotton is kept the temperature, and heating plate is begun to warm up after energization, and constant temperature protection and cooling processing are carried out after heating, cooling
After knock out welding zone epidermis and complete a whole set of welding sequence.
The opening width of groove is 12mm~15mm in S1, and groove gap ensures between 1mm~3mm, while nozzle
Outer end must not have the Notch damage greater than 0.5mm.
Heating equipment in S2 is using any one in flame preheater, blowtorch, tracklayer heater or rope type heater
Kind, preheating temperature is maintained at 120~180 DEG C.
Tack welding solder joint must not be less than at 4 points in S3, be uniformly distributed in and 9 o'clock direction of pipe fitting at 12 points, 3 points, 6 points,
And the length of tack welding guarantees in 15~20mm, 2~4mm of height, while must not exceed the 2/3 of tube wall thickness.
The gage of wire of argon arc welding is 2~2.5mm in S3, and the electric current of argon arc welding, voltage and gas flow parameter are divided
It Wei not 80~100A, 12V, 8~10L/min.
Heat-preservation cotton in S4 uses the component of alumina silicate fibre material, and the size of heat-preservation cotton is 50 × 600mm.
The heating rate of heating in S4 uses 170 DEG C/h, when being heated to 260 DEG C or more, using 180 × 25/T (DEG C/h),
Soaking time is T/25h, and for rate of temperature fall using 230 × 25/T (DEG C/h), 250 DEG C or less can natural cooling.
Embodiment 2:
According to same steps repeat embodiment 1, different from the heating in embodiment 1: S4 heating rate using 185 DEG C/
Hour, when being heated to 280 DEG C or more, using 191 × 25/T (DEG C/h), soaking time T/24h, rate of temperature fall using 245 ×
25/T (DEG C/h), 275 DEG C or less can natural cooling.
Embodiment 3:
Embodiment 1 is repeated according to same steps, is adopted different from the heating rate of the heating in embodiment 1 and embodiment 2: S4
With 200 DEG C/h, when being heated to 300 DEG C or more, using 202 × 25/T (DEG C/h), soaking time T/25h, rate of temperature fall is adopted
With 260 × 25/T (DEG C/h), 300 DEG C or less can natural cooling.
Test case: materials: common weld-end fittings one, 1 weld-end fittings of embodiment one, implement 2 weld-end fittings one with
And 3 weld-end fittings of embodiment one；
Test: by the weld of aforementioned four weld-end fittings respectively in 20 DEG C, 100 DEG C, 150 DEG C, 200 DEG C, 250 DEG C of ring
Ultrasonic critical refraction longitudinal wave method is passed sequentially through in border and carries out residual stress detection, obtains attached drawing Fig. 2 and Fig. 3 data.
In conjunction with from the point of view of the detection figure of axial stress and circumferential stress, it can be evident that the data of common weld-end fittings
Fluctuate larger, the stress fluctuation of embodiment 1 is more steady, and the stress value of 100Mpa is only had more than at the center of weld seam, real
It is more steady to apply the whole fluctuation of example 2, all between 0-100Mpa, the stress value of embodiment 3 is best for control for stress value, is in 0-
80Mpa improves the total bearing capacity in pipe fitting welding region, avoids so that the residual stress of welded seam area reaches minimum zone
Because temperature causes pipe fitting to lead to the problem of fire check and cold crack, it ensure that the safety of pipe fitting conveying natural gas, improve simultaneously
The rigidity of pipe fitting, avoids the problem that occurring brittle failure at low temperature.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (7)
1. a kind of natural gas line welding procedure method, which is characterized in that comprising the following specific steps
S1, pipe fitting pretreatment: pipe fitting of two detector for outer diameter error ranges between -0.1%~+0.2% is selected；Apart from nozzle 50mm
Place derusts, and makes its surface in shape metallic luster；Nozzle position need to polish groove group pair, while the root face in 1.5~2.0mm
Polishing；
S2, pipe fitting are fixed, are preheated: being fixed pipe fitting by auxiliary locating tool equipment, while being used heating equipment line up 100mm model
Enclose interior carry out local preheating；
S3, pipe fitting welding: being fixed by tack welding line up first, secondly using progress back cover on the inside of argon arc welding line up
Welding is finally successively filled weldering and cosmetic welding in line up welding section using manual arc welding；
S4, heat treatment: winding heating plate in weld seam two sides centered on weld seam, radially each along pipe fitting using three thermocouples
120 ° of direction installations, it is ensured that the head of thermocouple is close to the weld seam zone of influence and is tightly attached to tube surface, while in the appearance of pipe fitting
Bread is wrapped up in heat-preservation cotton and is kept the temperature, and heating plate is begun to warm up after energization, constant temperature protection and cooling processing is carried out after heating, after cooling
It knocks out welding zone epidermis and completes a whole set of welding sequence.
2. a kind of natural gas line welding procedure method according to claim 1, which is characterized in that groove in the S1
Opening width is 12mm~15mm, and groove gap ensures between 1mm~3mm, while nozzle outer end must not have greater than 0.5mm
Notch damage.
3. a kind of natural gas line welding procedure method according to claim 1, which is characterized in that the heating in the S2
Using any one in flame preheater, blowtorch, tracklayer heater or rope type heater, preheating temperature is maintained at equipment
120~180 DEG C.
4. a kind of natural gas line welding procedure method according to claim 1, which is characterized in that tack welding in the S3
Solder joint must not be less than at 4 points, be uniformly distributed in and 9 o'clock direction of pipe fitting at 12 points, 3 points, 6 points, and the length of tack welding guarantees
In 15~20mm, 2~4mm of height, while it must not exceed the 2/3 of tube wall thickness.
5. a kind of natural gas line welding procedure method according to claim 1, which is characterized in that argon arc welding in the S3
Gage of wire be 2~2.5mm, and the electric current of argon arc welding, voltage and gas flow parameter are respectively 80~100A, 12V, 8
~10L/min.
6. a kind of natural gas line welding procedure method according to claim 1, which is characterized in that the heat preservation in the S4
Cotton uses the component of alumina silicate fibre material, and the size of heat-preservation cotton is 50 × 600mm.
7. a kind of natural gas line welding procedure method according to claim 1, which is characterized in that the heating in the S4
Heating rate use 170 DEG C/h, when being heated to 260 DEG C or more, using 180 × 25/T (DEG C/h), soaking time T/25h, drop
For warm rate using 230 × 25/T (DEG C/h), 250 DEG C or less can natural cooling.
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| CN201910649071.7A CN110340501A (en) | 2019-07-18 | 2019-07-18 | A kind of natural gas line welding procedure method |
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| CN201910649071.7A CN110340501A (en) | 2019-07-18 | 2019-07-18 | A kind of natural gas line welding procedure method |
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Cited By (2)
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| CN112464528A (en) * | 2020-11-10 | 2021-03-09 | 中国核动力研究设计院 | Method for measuring residual stress on inner surface and inside of welded pipeline |
| CN115214149A (en) * | 2021-04-19 | 2022-10-21 | 财团法人金属工业研究发展中心 | Method for jointing fiber thermoplastic composite pipe and aluminum alloy pipe |
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| CN115214149A (en) * | 2021-04-19 | 2022-10-21 | 财团法人金属工业研究发展中心 | Method for jointing fiber thermoplastic composite pipe and aluminum alloy pipe |
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