CN102554432B - Butt welding method for bimetal composite pipes - Google Patents
Butt welding method for bimetal composite pipes Download PDFInfo
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- CN102554432B CN102554432B CN201210023775.1A CN201210023775A CN102554432B CN 102554432 B CN102554432 B CN 102554432B CN 201210023775 A CN201210023775 A CN 201210023775A CN 102554432 B CN102554432 B CN 102554432B
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Abstract
The invention relates to a butt welding method for bimetal composite pipes, which includes the steps: connecting the two machined bimetal composite pipes to two electrodes of a power supply respectively, and nesting a high temperature resistant ceramic ring into a position to be welded of each bimetal composite pipe; gradually melting inner corrosion-resistant pipes of the bimetal composite pipes by means of the flash butt welding principle, subsequently starting melting base pipe materials of the bimetal composite pipes, filling high-pressure inert gas into welding joints through vent holes on the high temperature resistant ceramic rings, and blowing smelts of the base pipe materials and the inner corrosion-resistant pipes towards the outsides of the bimetal composite pipes; and after melting distances of base pipes reach a design value, stopping filling of the high-pressure inert gas, and then rapidly extruding the two bimetal composite pipes to realize butt welding of the bimetal composite pipes. The butt welding method facilitates on-site butt welding construction of the bimetal composite pipes, accelerates construction, decreases welding defects, and can be used for welding the bimetal pipes for corrosive petroleum and natural gas transportation.
Description
Technical field
The present invention relates to a kind of duct butt-welding method of composite bimetal pipe, the welding for corrosivity oil and gas transmission with bimetal tube.
Background technology
In oil and gas exploitation process, often to carry Korrosionsmedium.Along with the increase to energy demand, increasing high sulfur-bearing or carbonated severe corrosive wet crude or natural gas are exploited out, and the demand of high corrosion resistant aluminium alloy is also being increased.But because high corrosion resistant aluminium alloy price is high, affect greatly oil field user's economic benefit, user, in order to reduce cost of investment in a short time, is not generally happy to adopt high performance corrosion resistant alloy tubing, causes pipeline corrosion to lose efficacy and happen occasionally.The appearance of composite bimetal pipe has significantly reduced high anti-corrosion tubing cost, but defect often appears in its Site Welding, becomes and limits the key factor that it is applied.The automatic duct butt-welding method of bimetal tube of the present invention, can complete the butt welding operation at bimetal tube scene quickly and easily, reduces weld defect, reduces the generation of welding seam failure accident.
Summary of the invention
The object of the present invention is to provide a kind of duct butt-welding method of composite bimetal pipe, facilitate the on-the-spot butt welding welding procedure of bimetallic tubing, accelerate speed of application, reduce the flouring of weld defect.
In order to achieve the above object, the technical solution used in the present invention is:
A duct butt-welding method for composite bimetal pipe, comprises the steps:
(1) process respectively two sections of pipe ends for the treatment of the composite bimetal pipe of butt welding, specifically comprise the steps: the angle of inclination of 0.5～2 ° of the tube end maching to be welded of the base tube of described composite bimetal pipe, and be than the long 0.5～1.5mm of the pipe end to be welded of described base tube by the tube end maching to be welded of the corrosion-resistant inner tube of described composite bimetal pipe, and clean out;
(2) two sections of described composite bimetal pipes are connected respectively to two poles, pipe at the place to be welded of described composite bimetal pipe is nested with refractory ceramics ring, the outer surface of described refractory ceramics ring is provided with groove, and the footpath of described refractory ceramics ring is upwards provided with some passages;
(3) utilize flash butt welding principle that the corrosion-resistant inner tube of described composite bimetal pipe is melted gradually, the impure corrosion-resistant inner tube fused mass of fusing spreads to both sides;
(4) along with the melting process of described corrosion-resistant inner tube carries out gradually, the basepipe materials of described composite bimetal pipe also starts melting, in weld seam, inject high-pressure inert gas by the passage on described refractory ceramics ring simultaneously, the basepipe materials of the melting with impurity is blowed to outside described composite bimetal pipe, the fused mass of described corrosion-resistant inner tube is blown to outside the docking region and described composite bimetal pipe of described basepipe materials;
(5) determine the distance of base tube melting according to the material type of described composite bimetal pipe, when distance reaches after design load, stop injecting high-pressure inert gas, then two sections of composite bimetal pipes of crushing failure at high speed, finally realize the butt welding of composite bimetal pipe.
In such scheme, when described in described step (4), the basepipe materials of composite bimetal pipe also starts melting, the fused mass of described corrosion-resistant inner tube fills the groove of the refractory ceramics ring in described composite bimetal pipe.
In such scheme, the inert gas in described step (4) is argon gas.
Compared with prior art scheme, the beneficial effect that the technical solution used in the present invention produces is as follows:
Duct butt-welding method provided by the invention facilitates the on-the-spot butt welding welding procedure of composite bimetal pipe, accelerates speed of application, reduces the generation of weld defect, can be used for the welding of corrosivity oil and gas transmission bimetal tube.
Brief description of the drawings
The process schematic diagram of the duct butt-welding method of the composite bimetal pipe that Fig. 1～Fig. 5 provides for the embodiment of the present invention.
Fig. 6 is the structural representation of refractory ceramics ring in the embodiment of the present invention.
Fig. 7 is the cutaway view of Fig. 6.
Detailed description of the invention
Below in conjunction with drawings and Examples, technical solution of the present invention is described in detail.
The embodiment of the present invention provides a kind of duct butt-welding method of composite bimetal pipe, specifically comprises the steps:
(1) Fig. 1 is the structural representation of carrying the composite bimetal pipe of corrosive medium, comprise base tube 10 and corrosion-resistant inner tube 20, dock welding before, should process by Fig. 2 the pipe end of composite bimetal pipe, wherein the inclined angle alpha of base tube 10 is at 0.5～2 °, corrosion-resistant inner tube 20 is 0.5～1.5mm than the long L of base tube 10, and cleans out;
(2) composite bimetal pipe butt welding termination process as shown in Figure 3-Figure 5, first composite bimetal pipe 1 is connected respectively two poles with composite bimetal pipe 2, the pipe at the place to be welded of composite bimetal pipe is nested with refractory ceramics ring 3, outside refractory ceramics ring 3, there is a circle groove, the footpath of refractory ceramics ring 3 is upwards provided with some passages 4, as shown in Figure 6 and Figure 7;
(3) utilize flash butt welding principle that the corrosion-resistant inner tube of growing is melted gradually, initial impure corrosion-resistant internal layer fused mass 5 is to both sides diffusion, as shown in Figure 3;
(4) along with the melting process of corrosion-resistant inner tube carries out gradually, the basepipe materials of composite bimetal pipe also starts melting, the now groove size of refractory ceramics ring 3 outer surfaces design should ensure to have filled resistant material, in order to ensure that basepipe materials does not spread to corrosion-resistant internal layer position, in weld seam, note high-pressure inert gas argon gas by the passage 4 in refractory ceramics ring 3, the basepipe materials of the melting with impurity is blowed to outside composite bimetal pipe, corrosion-resistant inner tube fused mass is also blown to outside composite bimetal pipe and base tube docking region, as shown in Figure 4;
(5) determine the distance of base tube melting according to composite bimetal pipe material type, reach after design load, stop blowing, the pipe end of crushing failure at high speed composite bimetal pipe 1 and composite bimetal pipe 2, the final weld seam schematic diagram forming as shown in Figure 5, wherein 5a is corrosion-resistant inner layer material weld seam, and 5b is the weld seam that corrosion-resistant inner layer material and basepipe materials merge, and resistant material composition reduces gradually from inside to outside.
Use method provided by the invention can realize the butt welding welding of following tubing.
Low-alloy steel base tube-Ni-based anticorrosion internal layer multiple tube butt welding: first by carrying out tube end maching shown in Fig. 2, get L=1.2mm, α=0.85 °, both sides tubing connects the flash butt welding source of welding current, after the composite bimetal pipe 1 nested refractory ceramics ring in one end grips, ensure also nested another section of composite bimetal pipe 2 that enter of refractory ceramics ring, mobile composite bimetal pipe 2 makes the pipe end of two sections of composite bimetal pipes close at a slow speed, make corrosion-resistant internal layer start the happy and harmonious spark that bursts out, groove at refractory ceramics ring outer surface is full of after nickel-base material substantially, basepipe materials starts to inject in weld seam the argon gas of certain pressure before starting have spark to produce, happy and harmonious base tube with impurity thing is blowed to outside pipe.In the time that base tube merges length to 5mm, stop argon gas and inject, the fast moving of exerting pressure composite bimetal pipe 2, makes composite bimetal pipe 1 and composite bimetal pipe 2 to welded together.
Low-alloy steel base tube-22Cr two phase stainless steel internal layer multiple tube butt welding: first by carrying out tube end maching shown in Fig. 2, get L=1.0mm, α=0.75 °, both sides tubing connects the flash butt welding source of welding current, after the composite bimetal pipe 1 nested refractory ceramics ring in one end grips, ensure also nested another section of composite bimetal pipe 2 that enter of refractory ceramics ring, mobile composite bimetal pipe 2 makes the pipe end of two sections of composite bimetal pipes close at a slow speed, make corrosion-resistant internal layer start the happy and harmonious spark that bursts out, groove at refractory ceramics ring outer surface is full of after nickel-base material substantially, basepipe materials starts to inject in weld seam the argon gas of certain pressure before starting have spark to produce, happy and harmonious base tube with impurity thing is blowed to outside pipe.In the time that base tube merges length to 4mm, stop argon gas and inject, the fast moving of exerting pressure composite bimetal pipe 2, makes composite bimetal pipe 1 and composite bimetal pipe 2 to welded together.
Duct butt-welding method provided by the invention facilitates the on-the-spot butt welding welding procedure of composite bimetal pipe, accelerates speed of application, reduces the generation of weld defect, can be used for the welding of corrosivity oil and gas transmission bimetal tube.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. the duct butt-welding method of composite bimetal pipe, is characterized in that, comprises the steps:
(1) process respectively two sections of pipe ends for the treatment of the composite bimetal pipe of butt welding, specifically comprise the steps: the angle of inclination of 0.5～2 ° of the tube end maching to be welded of the base tube of described composite bimetal pipe, and be than the long 0.5～1.5mm of the pipe end to be welded of described base tube by the tube end maching to be welded of the corrosion-resistant inner tube of described composite bimetal pipe, and clean out;
(2) two sections of described composite bimetal pipes are connected respectively to two poles, pipe at the place to be welded of described composite bimetal pipe is nested with refractory ceramics ring, the outer surface of described refractory ceramics ring is provided with groove, and the footpath of described refractory ceramics ring is upwards provided with some passages;
(3) utilize flash butt welding principle that the corrosion-resistant internal layer of described composite bimetal pipe is melted gradually, the impure corrosion-resistant internal layer fused mass of fusing spreads to both sides;
(4) along with the melting process of described corrosion-resistant internal layer carries out gradually, the basepipe materials of described composite bimetal pipe also starts melting, in weld seam, inject high-pressure inert gas by the passage on described refractory ceramics ring simultaneously, the basepipe materials of the melting with impurity is blowed to outside described composite bimetal pipe, the fused mass of described corrosion-resistant internal layer is blown to outside the docking region and described composite bimetal pipe of described basepipe materials;
(5) determine the distance of base tube melting according to the material type of described composite bimetal pipe, when distance reaches after design load, stop injecting high-pressure inert gas, then two sections of composite bimetal pipes of crushing failure at high speed, finally realize the butt welding of composite bimetal pipe.
2. the duct butt-welding method of composite bimetal pipe as claimed in claim 1, it is characterized in that, when described in described step (4), the basepipe materials of composite bimetal pipe also starts melting, the fused mass of described corrosion-resistant inner tube fills the groove of the refractory ceramics ring in described composite bimetal pipe.
3. the duct butt-welding method of composite bimetal pipe as claimed in claim 1, is characterized in that, the inert gas in described step (4) is argon gas.
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| CN201210023775.1A CN102554432B (en) | 2012-02-03 | 2012-02-03 | Butt welding method for bimetal composite pipes |
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| CN201210023775.1A CN102554432B (en) | 2012-02-03 | 2012-02-03 | Butt welding method for bimetal composite pipes |
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| CN103056515B (en) * | 2012-12-26 | 2015-09-16 | 天津恩帜科技有限公司 | A kind of welding procedure ceramic-lined for oil and gas pipes conveying alpha-type aluminum oxide |
| CN103692073A (en) * | 2013-12-17 | 2014-04-02 | 诸暨斯贝达机械有限公司 | Flash welding method for dissimilar metal |
| CN104493330B (en) * | 2014-11-11 | 2016-11-16 | 中国石油天然气集团公司 | A kind of composite bimetal pipe girth joint is to welding method |
| CN104400200A (en) * | 2014-11-27 | 2015-03-11 | 广东省工业技术研究院(广州有色金属研究院) | Flash butt welding process for high-pressure boiler pipeline |
| CN104625372B (en) * | 2014-12-15 | 2016-08-24 | 贵州安大航空锻造有限责任公司 | The flash welding manufacturing process of structural steel heavy in section ring |
| CN104625376B (en) * | 2014-12-15 | 2016-08-24 | 贵州安大航空锻造有限责任公司 | The flash welding manufacturing process of aluminium alloy heavy in section ring |
| CN114310020A (en) * | 2021-12-29 | 2022-04-12 | 江苏杰润管业科技有限公司 | Butt welding method and device for large-diameter bimetal composite pipe |
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