CN108581139A - A kind of welding method of oil and gas transmission bimetal compound pipeline - Google Patents
A kind of welding method of oil and gas transmission bimetal compound pipeline Download PDFInfo
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- CN108581139A CN108581139A CN201810472535.7A CN201810472535A CN108581139A CN 108581139 A CN108581139 A CN 108581139A CN 201810472535 A CN201810472535 A CN 201810472535A CN 108581139 A CN108581139 A CN 108581139A
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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Abstract
The present invention provides a kind of welding method of oil and gas transmission bimetal compound pipeline, the welding method includes：End face processing is carried out to the first welding end surface and the second welding end surface；The gap of first welding ends liner layer and base is welded, the gap of the second welding ends liner layer and base is welded, forms the first layer；Anti-oxidation processing is carried out to welding ends, the first welding ends liner layer and the second welding ends liner layer are welded, forms the second layer；Part between the first layer and the second layer is welded, and third layer is formed；To being welded on the outside of third layer, the welding to the first welding ends and the second welding ends is completed.The weld seam cracking resistance that the welding method of the present invention is formed is good, safety accident caused by capable of effectively avoiding weld cracking, solves the problem of since bimetal compound pipeline liner layer is reduced by thermal oxide corrosivity in welding process.
Description
Technical field
The present invention relates to pipeline welding technology fields, more particularly, are related to a kind of oil and gas transmission bimetallic
The welding method of compound pipeline complex pipeline is particularly suitable for the double of the acidic corrosives petroleum gases such as conveying particle containing chlorine, hydrogen sulfide
Metal compounded pipe is welded.
Background technology
Liner corrosion resistant alloy composite bimetal pipe is also known as composite bimetal pipe, as the novel tube occurred in recent years,
Gradually start to answer in the special medias pipelines such as the petroleum gas raw material of particle containing chlorine oil gas, sour water, municipal sewage, purified water
With.Domestic composite bimetal pipe welding procedure operational method is more chaotic at present, and the welding of bimetal compound pipeline is applied
Work method does not form fixation, reliable flow and method.
Invention content
It is above-mentioned existing in the prior art it is an object of the present invention to solving for the deficiencies in the prior art
One or more problems.For example, one of the objects of the present invention is to provide a kind of petroleum gas that weld seam cracking resistance is good is defeated
Send the welding method with bimetal compound pipeline.
To achieve the goals above, the present invention provides a kind of welding of oil and gas transmission bimetal compound pipeline
Method, the bimetal compound pipeline are combined by liner layer and base, and the welding method may comprise steps of：It will
Intilted first inclined-plane is processed into from outside to inside in the base of first welding ends, and first inclined-plane is outer with the liner layer
Surface is intersected, and the intersection on the first inclined-plane and liner layer outer surface has the first length away from liner layer welding end surface, by the second weldering
Intilted second inclined-plane, the outer surface phase on second inclined-plane and the liner layer are processed into from outside to inside in the base for connecing end
Hand over, and the intersection of the second inclined-plane and liner layer outer surface has the second length away from liner layer welding end surface, first inclined-plane with
Second inclined-plane is arranged along pipeline radial symmetric, first length and second equal length；To in the first welding ends
The gap of lining and base is welded, and is welded to the gap of the second welding ends liner layer and base, and the first layer is formed；
Anti-oxidation processing is carried out to the first welding ends and the second welding ends, to the first welding ends liner layer and the second welding ends liner layer into
Row welding, forms the second layer；Part between the first layer and the second layer is welded, control welding material ingredient with
And the penetration ratio of transitional welding is 20%~30% between control liner layer and base, forms third layer；To third layer
Outside, welded between the first inclined-plane and the second inclined-plane, complete the welding to the first welding ends and the second welding ends.
In an exemplary embodiment of the welding method of the oil and gas transmission bimetal compound pipeline of the present invention
In, first length is 1mm~3mm, and first inclined-plane and the angle of pipeline radial direction are 25 °~35 °.
In an exemplary embodiment of the welding method of the oil and gas transmission bimetal compound pipeline of the present invention
In, it is described to the first welding ends and the second welding ends carry out it is anti-oxidation processing include to weld seam front carry out gas shield and
Gas shield is carried out to the back side of weld seam, the back side to weld seam is included in the inside of bimetal compound pipeline into gas shield
Construct air dam.
In an exemplary embodiment of the welding method of the oil and gas transmission bimetal compound pipeline of the present invention
In, described to carry out weld preheating when being welded to bimetal compound pipeline, interlayer temperature when welding is controlled 100
DEG C or less.
In an exemplary embodiment of the welding method of the oil and gas transmission bimetal compound pipeline of the present invention
In, the second layer of the formation includes using welding wire similar with the liner composition of layer or nickel-base alloy bare welding filler metal as wlding,
It is welded using hand tungsten argon arc welding method.
In an exemplary embodiment of the welding method of the oil and gas transmission bimetal compound pipeline of the present invention
In, the formation third layer includes using different steel weld material or nickel-bass alloy material, utilizes hand tungsten argon arc welding side
Method is welded.
In an exemplary embodiment of the welding method of the oil and gas transmission bimetal compound pipeline of the present invention
In, it includes using different steel weld material that welding weldering is carried out between the outside, the first inclined-plane and the second inclined-plane to third layer
Material or nickel-bass alloy material, are welded using welding rod arc soldering method.
In an exemplary embodiment of the welding method of the oil and gas transmission bimetal compound pipeline of the present invention
In, the first layer of the formation includes being welded using tungsten argon arc soldering method as wlding using different steel weld material.
The different steel weld material can be 309 stainless steels or ERNiCrMo-3 nickel-base alloy bare welding filler metals.
In an exemplary embodiment of the welding method of the oil and gas transmission bimetal compound pipeline of the present invention
In, the liner layer of the composite bimetal pipe is stainless steel or nickel-base alloy, and base is mild steel or low-alloy pipe line steel.
Compared with prior art, welding method advantageous effect of the invention includes：
(1) welding method through the invention welds bimetal compound pipeline, and welded seam cracking resistance is good, energy
It is enough effectively to avoid safety accident caused by weld cracking.
(2) it can effectively solve the problem that since bimetal compound pipeline liner layer is reduced by thermal oxide, corrosivity in welding process
The problem of.
(3) chemical element of weld seam in the welding process can be avoided to be diluted, can be conducive to keep weld metal
Toughness.
(4) it can effectively solve the problem that the sealing problem of composite bimetal pipe liner layer and base gap.
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 oil and gas transmission bimetal compound pipeline welding side of an illustrative embodiment of the invention
The welding ends machining sketch chart of method.
Fig. 2 shows the oil and gas transmission of an illustrative embodiment of the invention bimetal compound pipeline welding sides
The welding process flow schematic diagram of method.
Fig. 3 shows the oil and gas transmission bimetal compound pipeline welding side of an illustrative embodiment of the invention
Method constructs air dam schematic diagram.
Specific implementation mode
Hereinafter, oil and gas transmission according to the present invention will be described in detail in conjunction with attached drawing and exemplary embodiment
With the welding method of bimetal compound pipeline.
Specifically, compound for the bimetallic of the petroleum gas of the acid mediums such as conveying particle containing chlorine, hydrogen sulfide
The welding of pipeline, since the medium of conveying itself has corrosivity.Being suitable for this kind of composite bimetal pipe therefore, it is necessary to a kind of
Welding method ensures welding quality, improves the efficiency of welding.The present invention welding method from bimetal compound pipeline liner layer with
Metallurgical difference, weld seam corrosion resistance and weld seam cracking resistance between base are set out, it is proposed that tube end maching form, welding are accurate
The techniques welding methods such as standby program, pass sequence, welding material selection, ensure that pipeline is safe to use.
Fig. 1 shows the oil and gas transmission bimetal compound pipeline welding side of an illustrative embodiment of the invention
The welding ends machining sketch chart of method.Fig. 2 shows the oil and gas transmission bimetallics of an illustrative embodiment of the invention
The welding process flow schematic diagram of compound pipeline complex pipeline welding method.Fig. 3 shows the oil day of an illustrative embodiment of the invention
Right gas conveying bimetal compound pipeline welding method constructs air dam schematic diagram.
The present invention provides a kind of welding methods of oil and gas transmission bimetal compound pipeline.In the stone of the present invention
In one exemplary embodiment of the welding method of oily natural gas transportation bimetal compound pipeline, the composite bimetal pipe
Liner layer can be that corrosion resisting alloys, the bases such as stainless steel, nickel-base alloy can be mild steel or low-alloy pipe line steel.Certainly,
The applicable composite bimetal pipe in the welding side of the present invention is without being limited thereto, and the composite bimetal pipe of other materials is equally applicable to this hair
Bright welding method.It should be noted that the bimetal compound pipeline of the present invention refers to the acid such as conveying particle containing chlorine, hydrogen sulfide
The petroleum gas bimetal compound pipeline of property corrosive medium.The welding method may include：
Step S01 is processed the welding end surface of composite bimetal pipe.
As shown in Figure 1, the base 1 of the first welding ends is processed into from outside to inside and intilted first inclined-plane 3.First
Intersect (on the outside of liner layer) with the outer surface of liner layer 2 inside on inclined-plane 3.The outer surface of the inside and liner layer 2 on the first inclined-plane 3
Welding end surface of the intersecting lens of intersection away from liner layer 2 has the first length 4.The base 1 of second welding ends is processed into from outside to inside
And intilted second inclined-plane 5.Intersect (on the outside of liner layer) with the outer surface of liner layer 2 inside on the second inclined-plane 5.Second tiltedly
Welding end surface of the intersecting lens that the inside in face 5 is intersected with the outer surface of liner layer 2 away from liner layer 2 has the second length 6.First inclined-plane
3 and second inclined-plane 5 relative to caliber direction be symmetrical arranged.The equal length of first length 4 and the second length 6.I.e. in welding ends,
The liner layer protrudes certain length than the inclined-plane of the processing.
In this example, machinery may be used to the processing of the end face of pipe end and carries out cutting processing, but the processing side of the present invention
Method is without being limited thereto, other processing methods.
In this example, first inclined-plane and the angle of pipeline radial method can be 25 °~35 °.It preferably, can be with
It is 22 °~33 °.Second inclined-plane is radially symmetrical arranged with first inclined-plane, therefore, second inclined-plane and pipeline diameter
It is equal with the angle of pipeline radial method to the angle in direction and first inclined-plane.The length of first length can be
1mm~3mm.Preferably, it can be 1.5mm~2mm.Above-mentioned included angle is set with solder yield in conjunction with welding efficiency
It sets.In the welding process, excessive angle can increase weld metal loading, reduce welding efficiency.Too small angle can be led
It causes weld seam to generate incomplete fusion defect probability to increase, reduces solder yield.First length is to avoid base material pair to reduce
The dilution of liner layer corrosion resisting alloy element, due to relatively thin at the first length, excessive length will cause base material to be difficult to bear to weld
Electric current is connect, welding difficulty increases.Too small length will cause base's carbon steel material when welding to be melted in weld seam, increase dilute
Release rate.Therefore, it is provided with the first length of the present invention.
More than, using design above-mentioned groove have the advantage that including：First, it is convenient for before formally weld, to base
Layer is welded (in Fig. 21 shown in) with liner lamellar spacing.Second, groove type using the present invention enables to base's material
Material is kept apart with the second layer, it is ensured that does not have base material to fuse into weld seam when carrying out lining layer part welding, effectively
Ground, which reduces, even avoids diluting effect of the base material to liner layer corrosion resisting alloy element, ensure that the resistance to of liner layer material
Corrosive nature.
Step S02 welds the gap of welding terminal inner lining layer and base, forms the first layer.
As shown in Fig. 2, the gap of the liner layer first to the first welding ends and base is welded after processing is completed for end face
And the liner layer of the second welding ends and the gap of base are welded, form the first layer 1.
In this example, for the welding of formation layer 1, different steel weld material may be used.For example, different steel weld
Material can be stainless steel or nickel-base alloy bare welding filler metal material, it is preferred that can be 309 stainless steels or ERNiCrMo-3 nickel-base alloys
Welding wire.
In this example, the smaller argon tungsten-arc welding of heat input may be used in welding method.It is welded using above-mentioned high alloy
Silk can be effectively formed being isolated for liner layer and base in conjunction with the argon tungsten-arc welding of the present invention.For example, corrosion resistant alloy and common carbon
Alloying element is isolated between steel, efficiently avoids the metal structure that middle alloy is brittle, easy to crack.
Step S03 carries out anti-oxidation processing to the first welding ends and the second welding ends.
It is to influence weld seam power in order to avoid oxygen and high temperature weld metal aoxidize to carry out anti-oxidation processing to welding ends
Learn performance and corrosion resistance.Anti-oxidation processing is carried out to welding ends to need to carry out anti-oxidation place to the back side of weld seam and front
Reason.During the welding process.If welding gun/welding rod when welding has protective effect, weld seam front need not be carried out again single
Only protection against oxidation.First, it after the first layer is formed, needs to carry out anti-oxidation processing to the back side of weld seam.
In this example, carrying out gas shield to the back side of weld seam can be in the Internal architecture gas of bimetal compound pipeline
Dam.It can be the material easily excluded to construct material used in air dam both ends, for example, matching with bimetal compound pipeline internal diameter
Round rubber skin, can be either the material that can build confining gas room made with starch or other carbohydrate
Material.The distance for constructing the both ends material of air dam can be 200mm~300mm, it is preferred that can be 230mm~270mm, it is more excellent
Choosing, can be 250mm.Carrying out back-protective to weld seam can be to carrying out argon filling in multiple tube pipe, effect is that inside is living
Jump property replacement of oxygen becomes inert gas, avoids oxygen from being reacted with high temperature weld metal and aoxidizes, influences weld properties
And corrosion resistance.Oxygen determination instrument may be used after the completion of argon filling to measure oxygen content, residual oxygen content is not higher than 300ppm,
Preferably, not above 250ppm.Certainly, the gas of protection against oxidation of the invention is without being limited thereto, other inert gases.
As shown in figure 3, it is rubber skin, the two sides Interal fixation of rubber skin that the material at structure air dam both ends, which can be centre,
The material that can form closed gas compartment.In a centrally disposed pipeline that can be passed through protective gas for rubber skin,
The pipe surface being placed in air dam is provided with multiple stomatas for capableing of release guard gas.
Positive gas shield when being welded for bimetal compound pipeline can use argon gas.For example, when using argon arc welding
When being welded to bimetal compound pipeline, the pure argon that may be used 99.99% is protected.Bimetal compound pipeline is formed
When the first layer and the second layer, back of weld must be protected to prevent sealing run from being aoxidized.Equally it may be used
99.99% pure argon carries out gas shield.Certainly the protected mode of the present invention is without being limited thereto, it is, for example, possible to use flux shielding.
Flux shielding is mainly welded using flux-cored wire, and melting the skull to be formed by the drug core component in welding wire is protected.
Flux shielding mainly uses under conditions of gas shielding condition is relatively difficult to achieve.
Step S04 forms the second layer.
After carrying out gas shield to welding ends, as shown in Fig. 2, to the first welding ends liner layer and the second welding ends liner layer
It is welded, forms the second layer 2.
In this example, the smaller hand tungsten argon arc welding of heat input may be used in the second layer 2.
In this example, it forms the second layer and welding wire similar with the liner composition of layer or material may be used, also may be used
To select nickel-base alloy bare welding filler metal.
Step S04 forms third layer.
After welding ends forms the second layer, as shown in Fig. 2, the portion between outside and the first layer 1 to the second layer 2
Divide and welded, forms third layer 3.
In this example, big using the welding methods blow force of arc such as welding electrode arc welding since liner layer is relatively thin, heat input
Greatly, coating portion is easy to burn, and molten bath is difficult to be formed.Meanwhile being more effective for the welding between liner layer and base's carbon steel
Prevent dilution and the problems such as carbon diffusion, transitional weld between liner layer and base should strictly control penetration ratio.It is preferred that
, penetration ratio can be controlled 20%~30%.
In this example, in order to more effectively prevent dilution and carbon diffusion the problems such as, the formation third layer can be adopted
With different steel weld material or nickel-bass alloy material, welded using hand tungsten argon arc welding method.
Step S05, the part enclosed between the outside, the first inclined-plane and the second inclined-plane of third layer is welded, complete
The welding of pairs of first welding ends and the second welding ends.
As shown in Fig. 2, the part enclosed between the outside, the first inclined-plane and the second inclined-plane of third layer is welded.
N in Fig. 2 indicates the number of plies of welding.The number of plies of welding is adjusted according to the thickness of pipeline, until pipeline weldering is full.Example
Such as, the thickness of preferred every layer of welding can be 2mm~3mm.
In this example, for the outside of third layer, welding electrode arc welding may be used in the welding of base method.In order to
There is better welding efficiency, forms the weldering between the first layer, the second layer, third layer and the base of composite bimetal pipe
It connects and heating wire TIG may be used is welded.
In this example, the welding of the part enclosed between the outside, the first inclined-plane and the second inclined-plane of the third layer
Different steel weld material or nickel-bass alloy material may be used, welded using welding rod arc soldering method.
More than, to ensure the corrosion resistance of liner layer material, avoid liner layer material in the welding process in sensitization temperature
The degree section residence time is long, without carrying out weld preheating.Meanwhile to prevent the generation of HOT CRACK FOR WELDING P and the crystalline substance of heat affected area
Grain length is big and Carbide Precipitation, should control interlayer temperature, can control interlayer temperature at 100 DEG C or less, it is preferred that can be with
Interlayer temperature is controlled at 90 DEG C hereinafter, the interlayer temperature of such as control can be 80 DEG C.
More than, the welding material consistent with liner layer can be selected by forming the second layer.First layer, third layer and
Welding between base needs that, in view of connecting between liner layer and base, different steel weld material can be selected.For example, liner
Layer is the stainless steel of 316L, then 316L stainless steel solid welding wires can be selected during forming the second layer.Third is welded
Welding between layer and base can be selected such as 309 stainless steel welding sticks, welding rod, be had the advantages that at low cost.
More than, it is 58%~62% Nickel-based Alloy Welding material that the Nickel-based Alloy Welding material, which can utilize nickel content,
Composite bimetal pipe is welded, the layer between the second layer, third layer and base is formed.It is using nickel content
58%~62% Nickel-based Alloy Welding material has the advantages that corrosion resistance, cracking resistance are more preferable.It is, for example, possible to use nickel
The ERNiCrMo-3 nickel-base alloy wldings that content is 58%~62% are welded.
In conclusion the welding method of the present invention carries out bimetal compound pipeline the weld seam cracking resistance of welding formation
It is good, it can effectively avoid safety accident caused by weld cracking.And it can effectively solve the problem that since bimetallic is multiple in welding process
Pipe lining layer is closed by thermal oxide, the problem of corrosivity reduces, the chemical element of weld seam in the welding process can be avoided dilute
It releases, is conducive to the toughness for keeping weld metal, efficiently solves the sealing problem of composite bimetal pipe liner layer and base gap.
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 oil and gas transmission bimetal compound pipeline, which is characterized in that the bimetallic is compound
Pipeline is combined by liner layer and base's machinery, and the welding method includes the following steps：
Intilted first inclined-plane, first inclined-plane and the liner are processed into from outside to inside in the base of first welding ends
The outer surface intersection of layer, and the intersection on the first inclined-plane and liner layer outer surface has the first length away from liner layer welding end surface, it will
Intilted second inclined-plane is processed into from outside to inside in the base of second welding ends, and second inclined-plane is outer with the liner layer
Surface is intersected, and the intersection of the second inclined-plane and liner layer outer surface has the second length away from liner layer welding end surface, and described first
Inclined-plane is arranged with second inclined-plane along pipeline radial symmetric, first length and second equal length；
The gap of first welding ends liner layer and base is welded, the gap of the second welding ends liner layer and base is carried out
Welding forms the first layer；
Anti-oxidation processing is carried out to the first welding ends and the second welding ends, to the first welding ends liner layer and the second welding terminal inner lining
Layer is welded, and the second layer is formed；
Part between the first layer and the second layer is welded, and welding material ingredient and control liner layer and base are controlled
The penetration ratio of transitional welding is 20%~30% between layer, forms third layer；
It is welded between the outside, the first inclined-plane and the second inclined-plane of third layer, completes to weld the first welding ends and second
Connect the welding at end.
2. the welding method of oil and gas transmission bimetal compound pipeline according to claim 1, which is characterized in that
First length is 1mm~3mm, and first inclined-plane and the angle of pipeline radial direction are 25 °~35 °.
3. the welding method of oil and gas transmission bimetal compound pipeline according to claim 1, which is characterized in that
It is described that carry out anti-oxidation processing to the first welding ends and the second welding ends include carrying out gas shield and right to the front of weld seam
The back side of weld seam carries out gas shield, and the back side to weld seam is included in the inside structure of bimetal compound pipeline into gas shield
Build air dam.
4. the welding method of oil and gas transmission bimetal compound pipeline according to claim 1, which is characterized in that
Described to carry out weld preheating when being welded to bimetal compound pipeline, interlayer temperature when welding is controlled at 100 DEG C
Below.
5. the welding method of oil and gas transmission bimetal compound pipeline according to claim 1, which is characterized in that
The second layer of the formation includes being utilized as wlding using welding wire similar with the liner composition of layer or nickel-base alloy bare welding filler metal
Hand tungsten argon arc welding method is welded.
6. the welding method of oil and gas transmission bimetal compound pipeline according to claim 1, which is characterized in that
The formation third layer include use different steel weld material or nickel-bass alloy material, using hand tungsten argon arc welding method into
Row welding.
7. the welding method of oil and gas transmission bimetal compound pipeline according to claim 1, which is characterized in that
Carried out between the outside, the first inclined-plane and the second inclined-plane to third layer welding weldering include using different steel weld material or
Person's nickel-bass alloy material is welded using welding rod arc soldering method.
8. the welding method of oil and gas transmission bimetal compound pipeline according to claim 1, which is characterized in that
The first layer of the formation includes being welded using tungsten argon arc soldering method as wlding using different steel weld material.
9. the welding method of oil and gas transmission bimetal compound pipeline according to claim 8, which is characterized in that
The different steel weld material is 309 stainless steels or ERNiCrMo-3 nickel-base alloy bare welding filler metals.
10. the welding method of oil and gas transmission bimetal compound pipeline according to claim 1, feature exist
In the liner layer of the composite bimetal pipe is stainless steel or nickel-base alloy, and base is mild steel or low-alloy pipe line steel.
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| CN110977098A (en) * | 2019-12-12 | 2020-04-10 | 中国石油天然气第一建设有限公司 | Welding operation method for transition layer and multiple layer of composite steel plate |
| CN110977098B (en) * | 2019-12-12 | 2021-05-04 | 中国石油天然气第一建设有限公司 | Welding operation method for transition layer and multiple layer of composite steel plate |
| CN114473278A (en) * | 2022-01-29 | 2022-05-13 | 中建钢构工程有限公司 | Method for welding steel material with Z-direction performance |
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