CN108637513A - A kind of welding method of petroleum gas long-distance transmission pipeline - Google Patents
A kind of welding method of petroleum gas long-distance transmission pipeline Download PDFInfo
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- CN108637513A CN108637513A CN201810468590.9A CN201810468590A CN108637513A CN 108637513 A CN108637513 A CN 108637513A CN 201810468590 A CN201810468590 A CN 201810468590A CN 108637513 A CN108637513 A CN 108637513A
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention provides a kind of welding method of petroleum gas long-distance transmission pipeline, the method includes the steps：Internal architecture air dam at long-distance transmission pipeline end to be welded；Group is to forming weld bond, it is sealed with band butt welding mouth, form sealant, according to clock position, gas outlet is set in the o'clock positions sealant Y, air inlet is set in the o'clock positions X, wherein, 10≤X ＜ 12 or 0 ＜ X≤2, Y o'clock position heights are not less than X o'clock position heights；It is passed through protective gas by air inlet, air is discharged；According to clock position, the weld bond between X o'clock 6 o'clock of Y o'clock carries out root bead, filling weldering and cosmetic welding, the step and is continually fed into protective gas；Cooling stops ventilation, and then the unwelded part of butt welding mouth carries out root bead, filling weldering and cosmetic welding successively, is finally completed the welding to entire weld bond.Beneficial effects of the present invention include：Argon gas protection fills that effect is good, and welding quality is good, at low cost in welding process.
Description
Technical field
The present invention relates to the welding fields of petroleum gas, particularly, are related to a kind of petroleum gas long distance delivery pipe
The welding method in road.
Background technology
The welding emphasis of petroleum gas long-distance transmission pipeline is to prevent weld metal and heat affected area from aoxidizing, to prevent
The reduction of its corrosion resistance；When circuit connects head welding, how to carry out interior argon-filled protection to even head weld bond is whether being welded successfully
Key.Currently used technique is a setting one argon gas inlet port and exhaust outlet, due to there are two gas inlet and outlets,
The protecting effect of welding is not very ideal, and in the welding process, air can pour in pipe, causes root of weld oxidation tight
Weight, causes weld seam unqualified and scarfing is rewelded, and claim for eot and manpower goods and materials can be caused to waste.
Invention content
For the deficiencies in the prior art, it is an object of the invention to solve above-mentioned one existing in the prior art
Or multiple problems.
To achieve the goals above, the present invention provides a kind of welding method of petroleum gas long-distance transmission pipeline,
The welding method may include following steps：Internal architecture air dam at the end to be welded of the long-distance transmission pipeline；By two
The end to be welded that air dam has been constructed in a inside is grouped, and forms weld bond, is sealed with band butt welding mouth, forms sealing
Gas outlet is arranged in the o'clock positions Y of sealant according to clock position in layer, and air inlet is arranged in the o'clock positions X of sealant,
Wherein, the height of 10≤X ＜ 12 or the 0 o'clock positions ＜ X≤2, Y is not less than the height of the o'clock positions X, it is preferred that the o'clock positions Y
Height be higher than the o'clock positions X height；It is passed through protective gas to the space inside weld bond by the air inlet, is made in weld bond
The air in portion space is discharged from the gas outlet；According to clock position, the weld bond between-X o'clock -6 o'clock of Y o'clock carries out root
Weldering, forms bottoming layer, which is continually fed into the protective gas；Bottoming layer temperature is down to 100 DEG C hereinafter, filling out
Weldering is filled, forms filling layer on bottoming layer, which is continually fed into the protective gas；Filling layer temperature is down to 100
DEG C hereinafter, carry out cosmetic welding, fills and form capping layer on layer, which is continually fed into the protective gas；Continuing to be passed through
Capping layer temperature is down to 100 DEG C hereinafter, stopping being passed through protective gas, butt welding mouth is not welded under conditions of protective gas
Part carry out successively root bead, filling weldering and cosmetic welding, be finally completed the welding to entire weld bond.
According to the present invention is based on an exemplary embodiment, the long-distance transmission pipeline include hundreds of meters to tens of thousand
The pipeline of rice, further, including thousands of rice are to the pipeline of tens of kms.
According to the present invention is based on an exemplary embodiment, the end to be welded that air dam has been constructed in two inside is grouped
Afterwards, the distance between the air dam and weld bond are 30~120mm.
According to the present invention is based on an exemplary embodiment, the material for constructing air dam may include the material easily excluded
Material.
According to the present invention is based on an exemplary embodiment, the band may include adhesive tape or aluminum foil and adhesive tape.
According to the present invention is based on an exemplary embodiment, the material easily excluded includes that diameter is equal or slightly larger than
The rubber disk of the long-distance transmission pipeline internal diameter, the rubber wafer thickness are 2mm~5mm.
According to the present invention is based on an exemplary embodiment, according to clock position, between-X o'clock -6 o'clock of Y o'clock
Weld bond carry out root bead the step of include：According to clock position, the weld bond between Z o'clock at o'clock-X carries out root bead, to Z points
Weld bond between clock-Y o'clock carries out root bead, wherein 5≤Z≤7.
According to the present invention is based on an exemplary embodiment, described the step of being filled weldering includes：According to hour position
It sets, the weld bond between Z o'clock at o'clock-X is filled weldering, and the weld bond between Z o'clock at o'clock-Y is filled weldering.
According to the present invention is based on an exemplary embodiment, the step of progress cosmetic welding includes：According to hour position
It sets, the weld bond between Z o'clock at o'clock-X carries out cosmetic welding, and the weld bond between Z o'clock at o'clock-Y carries out cosmetic welding.
According to the present invention is based on an exemplary embodiment, it is described logical to the space inside weld bond by the air inlet
The step of entering protective gas include：By the air inlet, the bend pipe that will convey the protective gas is inserted into the weld bond
The bottom of inner space is passed through the protective gas by bend pipe, wherein the outlet side of the bend pipe is flat and includes two
A flat horizontal surface is each provided with a venthole on two flat horizontal surfaces, and two ventholes can be facing.
According to the present invention is based on an exemplary embodiment, before described the step of constructing air dam, the welding side
Method further includes：The closely air dam to be constructed, the position far from the weld bond in the long-distance transmission pipeline, heap accumulation
Powder group food.
According to the present invention is based on an exemplary embodiment, before root bead, the welding method further includes step：It is right
The oxygen content in the space inside the weld bond is detected.
Compared with prior art, the welding quality of the welding method of petroleum gas long-distance transmission pipeline of the invention
Good, at low cost, protective gas (such as argon gas) protecting effect is good in the welding process.
Description of the drawings
By the description carried out below in conjunction with the accompanying drawings, above and other purpose of the invention and feature will become more clear
Chu, wherein：
Fig. 1 shows the radial cross section of the weld bond according to another exemplary embodiment of the invention.
Fig. 2 shows the axial cross-sectional views according to the weld bond inner space of another exemplary embodiment of the invention.
Specific implementation mode
Hereinafter, the petroleum gas for describing the present invention in detail in conjunction with attached drawing and exemplary embodiment is defeated over long distances
Send the welding method of pipeline.
The welding method of petroleum gas long-distance transmission pipeline according to an exemplary embodiment of the present invention may include following
Step：
Internal architecture air dam at the end to be welded of the long-distance transmission pipeline；The air dam and the port to be welded
Distance can be 30~120mm, can determine that specific distance, the material for constructing air dam may include according to the size of caliber
The material easily excluded, for example, the material for being dissolved in the material of water or easily being excluded in logical ball test, easily excludes in logical ball test
Material may include that diameter is equal or slightly larger than the rubber disk of the long-distance transmission pipeline internal diameter, and rubber wafer thickness can be
2mm~5mm, it is preferable that be 3mm.
The end to be welded that two inside have been constructed to air dam is grouped, and forms weld bond, is carried out with band butt welding mouth close
Envelope forms sealant, is sealing space inside sealant, and according to clock position, gas outlet is arranged in the o'clock positions Y of sealant
Air inlet is arranged in the o'clock positions X of sealant in (also known as exhaust outlet), wherein 10≤X ＜ 12 or 0 ＜ X≤2, Y o'clock position
The height set is not less than the height of the o'clock positions X；Preferably, X is 11 or 1, Y 12, when gas outlet setting is in 12 o'clock position,
Fully air can be discharged.The width of weld bond can be 1.5~80mm, can be 1.5~50mm further, such as 30 ±
The width of 10mm, certain weld bond of the present invention are not limited to these ranges, can be according to the form of welded pipe line thickness and groove come really
It is fixed.Band may include adhesive tape or aluminum foil and adhesive tape.
Since usually used protection air tightness is more than atmospheric density, to ensure that air displacement is totally in pipeline, it is desirable that
Gas outlet or exhaust outlet are higher than air inlet, for example, gas outlet is arranged in peak.
It is passed through protective gas to the space inside weld bond by the air inlet, by the air of weld bond inner space from described
Gas outlet is discharged, and can prevent or reduce welding root in this way and aoxidize, oxidation, which occurs, for welding root will lead to weld seam not
Qualified and scarfing is rewelded.Wherein, the space inside weld bond is protected by the gas that air dam, the end to be welded of pipeline and band are formed
Protect room；Protective gas may include that inert gas (such as argon gas), carbon dioxide, nitrogen etc. are not easy instead to give birth to oxidation reaction, and density
More than the gas of air.
According to clock position, the weld bond between-X o'clock -6 o'clock of Y o'clock carries out root bead, forms bottoming layer, the step
Suddenly it is continually fed into protective gas.Wherein, the weld bond between the-X o'clock -6 o'clock of Y o'clock includes from Y o'clock, through 6 points
Clock, to the weld bond at X o'clock, or from X o'clock, through 6 o'clock, to the weld bond at Y o'clock；In this step, root bead can divide 2~3
Segmentation carries out, and segmented welding is can to reduce weld metal temperature, in addition can also be into one in the tack welding process of segmentation
Displaced air is walked, to ensure welding quality.
Bottoming layer temperature is down to 100 DEG C hereinafter, such as 90 ± 5 DEG C, weldering is filled, filling is formed on bottoming layer
Layer, the step are continually fed into the protective gas.In this step, filling weldering can divide 2~3 segmentations to carry out, and segmented welding is
Weld metal temperature can be reduced, in addition the acceptable further displaced air in the tack welding process of segmentation, to ensure to weld
Connect quality.
Filling layer temperature is down to 100 DEG C hereinafter, such as 90 ± 5 DEG C, cosmetic welding is carried out, forms capping layer, the step
It is continually fed into the protective gas.In this step, cosmetic welding can divide 2~3 segmentations to carry out, and segmented welding is can to reduce weld seam
Metal temperature, in addition in the tack welding process of segmentation can also further displaced air, to ensure welding quality.
Capping layer temperature is down to 100 DEG C hereinafter, stopping being passed through protection gas under conditions of continuing to be passed through protective gas
Body, the part that butt welding mouth is not welded carry out root bead, filling weldering and cosmetic welding, are finally completed the weldering to entire weld bond successively
It connects.Wherein, the welding for often completing one layer, can cool, in time to ensure quality.
In the present embodiment, petroleum gas long-distance transmission pipeline may include austenitic stainless steel (such as 316,316L,
304), two phase stainless steel (such as SAF2205, SAF2507) or nickel-base alloy (such as N08825, N06625) etc. have due to anti-
The alloy pipeline of corrosive nature or the multiple tube constituted by above at least two.
In the present embodiment, due to stainless steel, nickel-base alloy etc., this kind of resistant material is deposited in 485~850 DEG C of sections
In heat sensitization phenomenon, harmful phase is will produce, reduces material performance itself, mainly reduces material anticorrosion properties.Therefore it is welding
Fast cooling is needed in termination process, shortens 485~850 DEG C of section residence times, therefore to ensure interpass temperature in the welding process
Degree is less than 100 DEG C, to accelerate lower road weld metal cooling.
In the present embodiment, the distance between air dam and weld bond are 30~120mm, such as 80 ± 10mm, specifically can basis
The size of caliber determines.
In the present embodiment, the long-distance transmission pipeline may include several kms to the long-distance transport pipes of tens kms, described
Long-distance transmission pipeline can be welded to form by a short ducts tens of or even up to a hundred (length of usual pipeline manufacture is about 11.5~
12.5m), the welding process of a complete Oil and Natural Gas Transportation Pipeline is：From start position (complete conveying i.e. to be formed
Pipeline one end) to final position (the complete conveyance conduit other end i.e. to be formed) each short duct is subjected to a group welding equipment successively
It connects；But since the factors such as construction period, welding efficiency, construction equipment, material time of arrival restrict, need a point N number of segment
It constructs simultaneously, then each section is connected and (be known as connecting head weldering).It is stainless steel, nickel-base alloy and above-mentioned present invention is generally directed to tubing
Pipeline internal protection, especially length are hundreds of meters of long distance deliveries to several kms when the compound pipeline complex pipeline of material composition connects head weldering
Internal protection when pipeline welds.
In the present embodiment, according to clock position, the step of weld bond between Y o'clock at-Z o'clock ,-X o'clock carries out root bead
It may include：According to clock position, weld bond between Z o'clock at o'clock-X carries out root bead, the weld bond between Z o'clock at o'clock-Y into
Row root bead, wherein 5≤Z≤7, it is preferred that Z 6, two sections of welding can in no particular order sequentially.For example, can according to clock position,
Root bead is carried out from the o'clock positions Z of the weld bond to the o'clock positions X, and root is carried out from the o'clock positions weld bond Z to the o'clock positions Y
Weldering.
The step of being filled weldering may include：According to clock position, the weld bond between Z o'clock at o'clock-X is filled
Weldering, the weld bond between Z o'clock at o'clock-Y are filled weldering, wherein 5≤Z≤7, it is preferred that Z 6, two sections of welding can not
Successively sequence.For example, weldering can be filled from the o'clock positions weld bond Z to the o'clock positions X according to clock position, from weld bond Z points
Clock position to the o'clock positions Y carry out root bead, and two sections of welding can in no particular order sequentially.
The step of carrying out cosmetic welding may include：According to clock position, the weld bond between Z o'clock at o'clock-X carries out capping
Weldering, the weld bond between Z o'clock at o'clock-Y carry out cosmetic welding, wherein 5≤Z≤7, it is preferred that Z 6, two sections of welding can not
Successively sequence.For example, cosmetic welding can be carried out from the o'clock positions weld bond Z to the o'clock positions X, according to the hour according to clock position
Position carries out cosmetic welding from the o'clock positions weld bond Z to the o'clock positions Y.In addition weld defect in order to control in welding process, should be as possible
Reduce connector.
In the present embodiment, the step of being passed through protective gas to the space inside weld bond by air inlet include：By bend pipe
Duct bottom is stretched into, protective gas is passed through, protection gas is full of from bottom to top needs space to be protected, and air is arranged from top gas outlet
Go out.It after being inserted into bend pipe, need to ensure that all positions in addition to air inlet and gas outlet are sealing states, then start to be passed through again
Protective gas.
As shown in Figure 1, bend pipe includes being sequentially connected and at an angle two sections, such as first segment and second segment are wherein,
First segment gos deep into the inside in weld bond space, and second segment is located at the outside of weld bond, and angle between the two can be according to practical feelings of ventilating
Condition determines, for example, can be 60~150 degree, 130 ± 10 degree etc..The end of first segment is the outlet side of bend pipe, and outlet side is flat
It is flat-shaped, and include two flat horizontal surfaces, a venthole is each provided on two flat horizontal surfaces, two ventholes can be facing, protection
The direction that gas is sprayed from venthole is vertical with flat horizontal surface.
The material of bend pipe is stainless steel elbow, and cannot use carbon steel pipe, because carbon steel connects with stainless steel or nickel-base material
It touches, weld metal can be polluted, the width of bend pipe can be 4mm~7mm, it is preferred that be 6mm, the length of bend pipe first segment is to be welded
Pipe diameter is connect to determine, for example, the length of first segment is not easy more than 20mm；The gas outlet of bend pipe is set as flat, this is
It is flat to be conducive in smooth deep pipe since welded gaps only have 2.5~3.5mm wide, while conveniently gas is outputed at flat place
Hole, two symmetrical ventholes at the flat place in bend pipe outlet side, is more advantageous to by air discharge pipe in the pipeline of weld seam both sides, really
Protect solder yield.The bend pipe makes simply, conveniently, and material can use the suitable gauge pipe clout of size, economy suitable
With.
In the present embodiment, before the step of constructing air dam, welding method may also include：In the long distance delivery pipe
Closely the air dam to be constructed, the position far from the weld bond, accumulation starch food, such as steamed bun etc. may be used in this way in road
To prevent the pressure of weld bond inner space excessive to make air dam collapse, lead to the leakage of protective gas.
In the present embodiment, before root bead, the welding method further includes step：The oxygen in the space inside butt welding mouth
Content is detected；When oxygen content be less than 200PPM, subsequent welding step can be carried out, weld bond can be prevented or reduced in this way
Influence of the oxygen of inner space to welding.In this step, oxygen content can be detected by the way that an oxygen analyser is arranged.
In the present embodiment, after the welding is completed, the welding method may also include step：Appearance inspection is carried out in time
It looks into, is checked according to main line weld bond Requirements of Nondestructive Testing after visual examination qualification.
In another exemplary embodiment of the present invention, by being arranged argon filling position at " 11 o'clock ", when by argon filling
Between from only being adjusted to 99% or more girth joint welding protection in root bead stage argon-filled protection, while it is light using homemade argon filling bend pipe
Pine nut is existing to entire pipeline welding protection, it is ensured that pipeline welding quality.Fig. 1 is shown to be implemented according to an example of the present invention
The radial cross section of the weld bond of example, it can be seen that being filled with protective gas (such as argon to weld bond inner space by bend pipe
Gas), air is discharged, meanwhile, it oxygen content can be detected in butt welding mouth inner space, weld bond has been divided into 1 section, 2 sections and 3 section 3
A part.Fig. 2 shows the axial cross-sectional views of weld bond inner space according to the present invention, P1 is band in figure, and P1 is
Air dam, band, air dam and section of tubing constitute confined chamber, and protective gas (such as argon gas) can be entered by gas inlet and outlet
Weld bond inner space room.
In the present embodiment, the welding method of petroleum gas long-distance transmission pipeline may include following steps：
(1) it as shown in Fig. 2, first constructing air dam using gasket P2 (such as 3mm thickness rubber skin) before pipe string, then carries out
Weld bond group pair, group to using adhesive tape or aluminum foil and adhesive tape P1 to carry out girth joint sealing after the completion.
(2) 6mm stainless steel elbows are used to carry out argon filling, argon filling position is located within the scope of girth joint 11-Y o'clock that (length is not
More than 20mm), the exhaust of the o'clock positions Y is carried out at the same time oxygen concentration in pipeline and detects.
(3) after oxygen concentration detection is qualified in pipeline, as shown in Figure 1, root bead welding " 1 section " first, i.e., 6 points to 11 o'clock model
It encloses, then welds " 2 sections ", i.e., 6 points counterclockwise to 12 o'clock range, the weld seam in " 3 sections " range does not weld temporarily, for into pipeline
Continue argon filling.
(4) it is filled weldering after near 100 DEG C of layer temperature, as shown in Figure 1, i.e. according to the sequence of " 1 section ", " 2 sections "
Welding；Cooling in time, cosmetic welding is completed after cooling according still further to same sequence after the completion of filling weldering；
(5) after " 2 sections ", " 1 section " weld metal temperature are down to 100 DEG C, argon filling pipeline is extracted, completes " 3 sections " range
The welding of interior root bead, filling and capping welding line, but one layer is often completed, it is both needed to cool down in time, to ensure quality.
In the present embodiment, after the completion of welding, visual examination should be carried out in time, is welded according to main line after visual examination qualification
Mouth Requirements of Nondestructive Testing is checked.
In the present embodiment, water should be dissolved in or be easy to exclude in logical ball test process by constructing the material of air dam
Material.
In the present embodiment, petroleum gas long-distance transmission pipeline may include the Ni-based pipelines of N08825.
One of weld bond of on-site cutting needs 2~3 hours (mechanical cold cut is cut), increases and is not shorter than 500mm long short circuits, then adds
Work groove, is welded again, and whole to need two plumbers, welder's cooperation, configuration generator etc., of the invention welds once
Cost at 2000 yuan or so, if it is at abroad, cost by 5000 yuan or more.As it can be seen that the welding cost of the present invention is low.
In conclusion the advantages of welding method of the petroleum gas long-distance transmission pipeline of the present invention, includes：It welded
Protective gas (such as argon gas) protecting effect is good in journey, can avoid or reduce the influence of oxygen welding quality, welding portion
Welding quality it is good, the cost needed for entire welding method is low.
Although above by describing the present invention in conjunction with exemplary embodiment, those skilled in the art should be clear
Chu can carry out exemplary embodiment of the present invention each in the case where not departing from spirit and scope defined by claim
Kind modifications and changes.
Claims (10)
1. a kind of welding method of petroleum gas long-distance transmission pipeline, which is characterized in that the welding method includes following
Step：
Internal architecture air dam at the end to be welded of the long-distance transmission pipeline；
The end to be welded that two inside have been constructed to air dam is grouped, and forms weld bond, is sealed with band butt welding mouth, shape
At sealant, according to clock position, gas outlet is set in the o'clock positions Y of sealant, air inlet is arranged in the o'clock positions X, wherein
The height of 10≤X ＜ 12 or the 0 o'clock positions ＜ X≤2, Y is not less than the height of the o'clock positions X；
It is passed through protective gas to the space inside weld bond by the air inlet, makes the air of weld bond inner space from the outlet
Mouth discharge；
According to clock position, the weld bond between-X o'clock -6 o'clock of Y o'clock carries out root bead, forms bottoming layer, which holds
It is continuous to be passed through the protective gas；
Bottoming layer temperature is down to 100 DEG C hereinafter, being filled weldering, formation filling layer, the step continue on bottoming layer
It is passed through the protective gas；
Filling layer temperature is down to 100 DEG C hereinafter, carrying out cosmetic welding, formation capping layer, the step are persistently led on filling layer
Enter the protective gas；
Under conditions of continuing to be passed through protective gas by capping layer temperature be down to 100 DEG C hereinafter, stop be passed through protective gas, it is right
The part that weld bond is not welded carries out root bead, filling weldering and cosmetic welding successively, is finally completed the welding to entire weld bond.
2. the welding method of petroleum gas long-distance transmission pipeline according to claim 1, which is characterized in that described two
A inside constructed air dam end to be welded be grouped after, the distance between the air dam and weld bond be 30~120mm.
3. the welding method of petroleum gas long-distance transmission pipeline according to claim 1, which is characterized in that the structure
The material for building air dam includes the material easily excluded.
4. the welding method of petroleum gas long-distance transmission pipeline according to claim 3, which is characterized in that described easy
The material of exclusion includes the rubber disk that diameter is equal or slightly larger than the long-distance transmission pipeline internal diameter, and the rubber disk is thick
Degree is 2mm~5mm.
5. the welding method of petroleum gas long-distance transmission pipeline according to claim 1, which is characterized in that described to press
According to clock position, the step of weld bond between-X o'clock -6 o'clock of Y o'clock carries out root bead, includes：
According to clock position, the weld bond between Z o'clock at o'clock-X carries out root bead, and the weld bond between Z o'clock at o'clock-Y carries out
Root bead, wherein 5≤Z≤7.
6. the welding method of petroleum gas long-distance transmission pipeline according to claim 5, which is characterized in that it is described into
Row filling weldering the step of include：
According to clock position, the weld bond between Z o'clock at o'clock-X is filled weldering, the weld bond between Z o'clock at o'clock-Y into
Row filling weldering.
7. the welding method of petroleum gas long-distance transmission pipeline according to claim 6, which is characterized in that it is described into
The step of row cosmetic welding includes：
According to clock position, weld bond between Z o'clock at o'clock-X carries out cosmetic welding, the weld bond between Z o'clock at o'clock-Y into
Row cosmetic welding.
8. the welding method of petroleum gas long-distance transmission pipeline according to claim 1, which is characterized in that described logical
Crossing the step of air inlet is passed through protective gas to the space inside weld bond includes：
By the air inlet, the bend pipe that will convey the protective gas is inserted into the bottom of the weld bond inner space, leads to
It crosses bend pipe and is passed through the protective gas, wherein the outlet side of the bend pipe is flat and includes two flat horizontal surfaces, and two flat
A venthole is each provided on face, two ventholes are facing.
9. the welding method of petroleum gas long-distance transmission pipeline according to claim 1, which is characterized in that described
Before the step of constructing air dam, the welding method further includes：
The air dam closely to be constructed, the position far from the weld bond, accumulate starch in the long-distance transmission pipeline
Food.
10. the welding method of petroleum gas long-distance transmission pipeline according to claim 1, which is characterized in that in root
Before weldering, the welding method further includes step：
The oxygen content in the space inside the weld bond is detected.
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| CN201810468590.9A CN108637513B (en) | 2018-05-16 | 2018-05-16 | Welding method for petroleum and natural gas long-distance conveying pipeline |
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| CN201810468590.9A CN108637513B (en) | 2018-05-16 | 2018-05-16 | Welding method for petroleum and natural gas long-distance conveying pipeline |
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| CN108637513B CN108637513B (en) | 2020-11-03 |
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| EP3135422A1 (en) * | 2015-08-22 | 2017-03-01 | METALKO Spolka. z o.o. | Multistage backing gas nozzle |
| CN207057882U (en) * | 2017-08-04 | 2018-03-02 | 中国能源建设集团东北电力第一工程有限公司 | A kind of pipeline welding argon-filling device |
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| CN104475933A (en) * | 2014-11-11 | 2015-04-01 | 中国十七冶集团有限公司 | Argon-filled protection sealing welding method for argon arc welding for pipeline |
| EP3135422A1 (en) * | 2015-08-22 | 2017-03-01 | METALKO Spolka. z o.o. | Multistage backing gas nozzle |
| CN106077917A (en) * | 2016-08-06 | 2016-11-09 | 天津市滨海新区聚荣科技有限公司 | Butt welding method for pipe with small diameter |
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