CN103008988A - Method for welding anticorrosion steel pipeline with no internal repaired mouth - Google Patents
Method for welding anticorrosion steel pipeline with no internal repaired mouth Download PDFInfo
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- CN103008988A CN103008988A CN2012105145440A CN201210514544A CN103008988A CN 103008988 A CN103008988 A CN 103008988A CN 2012105145440 A CN2012105145440 A CN 2012105145440A CN 201210514544 A CN201210514544 A CN 201210514544A CN 103008988 A CN103008988 A CN 103008988A
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Abstract
The invention provides a method for welding an anticorrosion steel pipeline with no internal repaired mouth, which is applicable to the anticorrosion treatment of a steel pipeline welding connector with an anticorrosion coating in the petroleum industry and the chemical industry. The method is characterized in that a groove with a certain length and depth is machined on a position which is at a certain distance from the end part of the steel pipe, an anticorrosion alloy material is surfaced on the groove, the end part of the surfaced steel pipe is machined into a V-shaped groove, an anticorrosion coating with sufficient thickness is coated on the inner wall of the steel pipe, the anticorrosion coating covers sufficient length of the anticorrosion alloy surfacing layer, then two steel pipes are in butt connection with each other, layering welding is carried out after the two steel pipes are fixed on one point, an argon tungsten-arc welding method is adopted, the anticorrosion alloy material which is identical to that of the surfacing is selected as the filling material, and argon is filled into the pipe to protect the pipe in the welding process. Due to the adoption of the novel technology for welding the anticorrosion steel pipeline with no internal repaired mouth, the corrosion resistance of the inner wall and a weld mouth of the pipeline can be guaranteed, the internal mouth repairing technology on the spot after the welding can be avoided, characteristics such as simplicity in construction and reliability in performance can be realized, and the method is suitable for the real engineering application of the petroleum and chemical industry fields.
Description
Technical field
The present invention relates to the pipeline welding technical field, be specifically related to the method that a kind of anticorrosive steel pipeline is exempted from the internal joint patch weldering.
Background technology
The most domestic oil gas field contains CO
2, H
2The Korrosionsmediums such as S cause corrosive pipeline in the oil-gas gathering and transportation process easily, cause leakage accident.Usually the field steel pipes such as oil, chemical industry need to carry out inside and outside anticorrosion to improve its resistance to corrosion, the service life of prolongation pipeline, the generation of minimizing leakage accident.Carry out at the scene again butt welding after general spraying operation organic or the inorganic anti-corrosion layer is prefabricated in the factory and become long lines.Because the welding pyroprocess causes near the corrosion-inhibiting coating of weld seam to lose efficacy easily during butt welding, needing postwelding is internal joint patch at inwall commissure coating corrosion-inhibiting coating, remedies welding process near the harmful effect of the coating antiseptic performance inwall weld metal zone.
Common jointing method has the commissure punching to put in hairbrush benefit brush applied coating and heavy-caliber pipeline adopts remote operated vehicle in-line section to carry out the methods such as repaired mouth, but these methods are difficult for accurately control, technical sophistication, and because site operation process condition restriction, the repaired mouth difficult quality guarantee, cause the service life of pipeline to shorten dramatically, increasing by the economic loss that pipeline corrosion leak brings.
Domestic scholars has been carried out a large amount of research work to welding and the repaired mouth problem of corrosion-resistant steel pipeline.China Patent Publication No. provides a kind of antiseptic steel pipe technology non-repairing inner and outer orifice for the patent of CN1110385A, the method is at first welded the preceding paragraph stainless steel inner lining and outer tube in pipe ends with the method for explosive welding, adopts method welding liner, pipeline body and the outer tube of layering welding again.The weak point of this method is that at first, this technical matters is complicated, and the bond strength of liner and pipeline body is difficult to guarantee.Secondly, the method is so that the butt welding of pipelines process becomes the welding of metal composite pipe, the introducing that is difficult to avoid new Welding Problems, directly open double V-groove because the inner liner thinner thickness burns easily, and matrix easily produces backing run and pollutes during bottoming.China Patent Publication No. also provides corrosion-resistanting interpolating port technology in a kind of pipe lining corrosion resistant alloy for the patent of CN202419038U, but there are Similar Problems in this technology and said method, liner and matrix are difficult to realize good metallurgical melting, and adverse effect is brought to butt welding of pipelines in the gap between matrix and the liner.China Patent Publication No. is saved the internal joint patch step for two patents of CN201615318U and CN2804559Y provide a kind of separately by the method that adapter sleeve, anti-corrosive cover, collet are set, but these two kinds of procedures are complicated, and anti-corrosive cover with manage be connected between matrix not firm.China Patent Publication No. arranges the method that the mode of connecting portion is removed the postwelding internal joint patch from for the patent of CN102003581A provides a kind of by pipe end, pipeline is carried out the jumping-up moulding with the connecting portion need of the method or casting is realized, and connecting portion end face anticorrosive coat is physical contact during the pipeline docking, what be difficult to avoid exists the gap, affects corrosion resistance.
Summary of the invention
The object of the present invention is to provide a kind of steel pipe new welding technology for the inner-wall spraying corrosion-inhibiting coating, this technology postwelding need not to carry out the internal joint patch process, and is practical, is suitable for the welding of the field anticorrosive steel pipelines such as oil, chemical industry.
For achieving the above object, the present invention realizes by following steps: comprise built-up welding step, mechanical processing steps, spraying step and butt welding step, concrete steps are as follows:
(1), built-up welding step: certain distance b place processes the groove (2) with certain-length a and degree of depth t in steel pipe (1) end, groove two ends rounding, prevent that the incomplete fusion defective from producing, the certain thickness corrosion resistant alloy material of built-up welding (3) on groove, overlaying method adopts argon tungsten-arc welding, overlay cladding (3) thickness should greater than depth of groove t, guarantee that weld metal fills up groove (2);
(2), tool procedure of processing: adopt the mode of machining that tube end maching is become docking double V-groove (4);
(3), the spraying step: machine add finish after, at the certain thickness corrosion-inhibiting coating of pipe inner-wall spraying (5);
(4), butt welding step: will process docking double V-groove (4) and two complete steel pipes of inner-wall spraying corrosion-inhibiting coating (5) and connect, and circumferentially put fixed bit along groove, number of welds is chosen according to pipe diameter size; First with overlay cladding (3) through welding, fill and cover welding during bottoming, welding method is selected argon tungsten-arc welding again.
The present invention also has following feature:
1, the distance b=5-15mm in the described step (), groove length a=20-40mm, depth of groove t=1-4mm.
2, corrosion resistant alloy material (3) comprises stainless steel or nickel-base alloy bare welding filler metal in the described step ().
3, the overlay length between corrosion-inhibiting coating (5) and the overlay cladding (3) is 8-10mm in the described step (three).
4, residue overlay cladding length should be more than 18mm after the machining in the described step (three), and overlay cladding is consistent with internal diameter of tube body.
5, the packing material of described step (four) select with step () in identical corrosion resistant alloy material, comprise stainless steel or nickel-base alloy bare welding filler metal.
6, in the described step (four) during argon tungsten-arc welding or near the anticorrosive coat edge, apply cooling provision.
The present invention realizes that steel pipe exempts from the principle of internal joint patch welding and be, built-up welding one deck corrosion resistant alloy on the steel pipe inner wall groove, overlay cladding and steel pipe matrix are metallurgical binding, thus the adverse effect that has existed the gap to bring to the butt welding process when having avoided liner and steel pipe matrix mechanical bond.Simultaneously because overlay cladding is reserved certain length, so that the butt welding high-temperature region is terminal away from corrosion-inhibiting coating, avoids coating burnt and lose antiseptic effect.Inner-walls of duct is continuous corrosion-inhibiting coating and corrosion-resistant alloy layer behind the butt welding, so the decay resistance of pipeline accesses abundant assurance.
The invention effect
Advantage of the present invention is:
(1) built-up welding one deck corrosion resistant alloy in the steel pipe inner wall groove, overlay cladding and steel pipe matrix are realized metallurgical binding, than the method that liner is set, can reduce the generation probability of weld defect in the butt welding process.
(2) inboard wall groove is reserved certain distance b apart from steel tube end part, guarantees that groove two ends body has enough rigidity, effectively reduces the contraction of caliber after the built-up welding, so that the easy centering of body during butt welding, reduce unfitness of butt joint, reduced the butt welding difficulty, improve welding quality.
(3) built-up welding and butt welding packing material are all selected corrosion resistant alloy material, and overlay cladding has adequate thickness, have intercepted that the element such as carbon is to the pollution of backing run in the steel pipe matrix, and rate of dilution is low.
(4) overlay cladding is reserved sufficient length, so that the anticorrosive coat end away from the butt welding high-temperature region, has been avoided high temperature that anticorrosive coat is burnt and lost efficacy.Inner-walls of duct is continuous corrosion-inhibiting coating and corrosion-resistant alloy layer, has fully guaranteed the corrosion resistance of pipeline.
The processes such as (5) built-up welding, machining and inner-wall spraying corrosion-inhibiting coating all can be prefabricated in the factory and finish, and the on-the-spot butt-welding process that only need carry out a steel pipe has improved efficient greatly, is suitable for practical engineering application.
Description of drawings
Fig. 1 steel pipe inner wall machined grooves sectional structure chart;
Fig. 2 groove built-up welding corrosion-resistant alloy layer schematic diagram;
Fig. 3 machining docking double V-groove schematic diagram;
Fig. 4 pipe inner-wall spraying corrosion-inhibiting coating schematic diagram;
Cross-sectional view behind Fig. 5 butt welding of steel tube;
Among the figure, 1-steel pipe matrix, 2-groove, 3-corrosion resistant alloy overlay cladding, 4-V type groove, 5-corrosion-inhibiting coating, 6-butt weld, a-groove length, the b-recess edge is apart from the steel tube end part distance, the d-pipe diameter, and the t-depth of groove, the s-corrosion-inhibiting coating covers corrosion resistant alloy overlay cladding length.
The specific embodiment
The invention provides a kind of steel pipe and exempt from the internal joint patch welding method, its implementation step is:
(1) built-up welding step
Be 5mm at steel pipe inner wall apart from end certain distance b, locating in advance machining, to go out a degree of depth be that t is that 1mm, length a are the groove of 20mm, and groove two ends rounding prevents that the incomplete fusion defective from producing.The certain thickness corrosion resistant alloy material of built-up welding on groove, such as stainless steel or nickel-base alloy bare welding filler metal etc., overlaying method adopts argon tungsten-arc welding, and overlay cladding thickness should greater than depth of groove, guarantee that weld metal fills up groove.
(2) mechanical processing steps
After built-up welding is complete, adopt the mode of machining that tube end maching is become the V-type butting grooves, should guarantee to remain overlay cladding length after the machining at 19mm, overlay cladding is consistent with internal diameter of tube body.
(3) spraying step
Machine add finish after, at the certain thickness corrosion-inhibiting coating of pipe inner-wall spraying, the overlay length s between corrosion-inhibiting coating and corrosion resistant alloy overlay cladding is at 8mm.
(4) butt welding step
Two steel pipes of inner-wall spraying corrosion-inhibiting coating are connected, circumferentially carry out a fixed bit along groove, number of welds suitably increases and decreases according to pipe diameter size, and tack welding should guarantee as far as possible staggered edge free of two pipes.Implement the layering welding after point is solid, with the overlay cladding through welding, backing welding selects argon tungsten-arc welding to be shaped to guarantee good reverse side during bottoming, and welding material is selected the corrosion resistant alloy material identical with overlay cladding.For reducing the dilution to the backing run alloying element, filling and capping are also to select identical corrosion resistant alloy packing material to be advisable.In pipe, take argon-filled protection in the welding process, for avoiding welding pyroprocess to the adverse effect of anticorrosive coat, under the prerequisite that guarantees fully fusion, adopt little standard welding as far as possible, also can near the anticorrosive coat end, apply cooling provision.
The invention provides a kind of steel pipe and exempt from the internal joint patch welding method, its implementation step is:
(1) built-up welding step
Be 15mm at steel pipe inner wall apart from end certain distance b, locating in advance machining, to go out a degree of depth be that t is that 4mm, length a are the groove of 40mm, and groove two ends rounding prevents that the incomplete fusion defective from producing.The certain thickness corrosion resistant alloy material of built-up welding on groove, such as stainless steel or nickel-base alloy bare welding filler metal etc., overlaying method adopts argon tungsten-arc welding, and overlay cladding thickness should greater than depth of groove, guarantee that weld metal fills up groove.
(2) mechanical processing steps
After built-up welding is complete, adopt the mode of machining that tube end maching is become the V-type butting grooves, should guarantee to remain overlay cladding length after the machining at 35mm, overlay cladding is consistent with internal diameter of tube body.
(3) spraying step
Machine add finish after, at the certain thickness corrosion-inhibiting coating of pipe inner-wall spraying, the overlay length s between corrosion-inhibiting coating and corrosion resistant alloy overlay cladding is 10mm.
(4) butt welding step
Two steel pipes of inner-wall spraying corrosion-inhibiting coating are connected, circumferentially carry out a fixed bit along groove, number of welds suitably increases and decreases according to pipe diameter size, and tack welding should guarantee as far as possible staggered edge free of two pipes.Implement the layering welding after point is solid, with the overlay cladding through welding, backing welding selects argon tungsten-arc welding to be shaped to guarantee good reverse side during bottoming, and welding material is selected the corrosion resistant alloy material identical with overlay cladding.For reducing the dilution to the backing run alloying element, filling and capping are also to select identical corrosion resistant alloy packing material to be advisable.In pipe, take argon-filled protection in the welding process, for avoiding welding pyroprocess to the adverse effect of anticorrosive coat, under the prerequisite that guarantees fully fusion, adopt little standard welding as far as possible, also can near the anticorrosive coat end, apply cooling provision.
Be Φ 76mm at caliber, wall thickness is the Q245R carbon steel piping of 9mm, opening a length at distance pipe end 10mm place is that 22mm, the degree of depth are the groove of 2mm, adopt tungsten argon arc to be welded in built-up welding corrosion resistant alloy on the groove, packing material can be selected 316L or 625 nickel-base alloy bare welding filler metals, guarantees to fill metal groove is filled up.With the body end processing V-shaped groove after the built-up welding, 40 ° of bevel angles, residue overlay cladding length 20mm after the machining, overlay cladding and inside pipe wall transition are smooth.In the thick polyethylene powders coating of pipe inner-wall spraying one deck 2mm, coating covers surfacing layer metal 10mm.Two complete steel pipes of inner-wall spraying corrosion-inhibiting coating are connected, circumferentially put admittedly along groove, the solid location solder joint of per 60 ° of points.First with the surfacing layer metal through welding, need to guarantee that good reverse side is shaped during bottoming, fill and cover welding again that welding method is still selected argon tungsten-arc welding, packing material is used identical with built-up welding, manages interior argon-filled protection in the welding process.Built-up welding and butt welding parameter are shown in Table 1, and postwelding can access the flawless joint of high-quality, and inner-walls of duct is continuous corrosion-inhibiting coating and corrosion resistant alloy overlay cladding, have guaranteed that pipeline has good corrosion resistance, and postwelding need not internal joint patch.
Table 1 built-up welding and butt-welding process welding parameter table
Claims (7)
1. an anticorrosive steel pipeline is exempted from the method for internal joint patch weldering, comprises built-up welding step, mechanical processing steps, spraying step and butt welding step, it is characterized in that concrete steps are as follows:
(1), built-up welding step: certain distance b place processes the groove (2) with certain-length a and degree of depth t in steel pipe (1) end, groove two ends rounding, prevent that the incomplete fusion defective from producing, the certain thickness corrosion resistant alloy material of built-up welding (3) on groove, overlaying method adopts argon tungsten-arc welding, overlay cladding (3) thickness should greater than depth of groove t, guarantee that weld metal fills up groove (2);
(2), tool procedure of processing: adopt the mode of machining that tube end maching is become docking double V-groove (4);
(3), the spraying step: machine add finish after, at the certain thickness corrosion-inhibiting coating of pipe inner-wall spraying (5);
(4), butt welding step: will process docking double V-groove (4) and two complete steel pipes of inner-wall spraying corrosion-inhibiting coating (5) and connect, and circumferentially put fixed bit along groove, number of welds is chosen according to pipe diameter size; First with overlay cladding (3) through welding, fill and cover welding during bottoming, welding method is selected argon tungsten-arc welding again.
2. a kind of anticorrosive steel pipeline according to claim 1 is exempted from the method for internal joint patch weldering, it is characterized in that: the distance b=5-15mm in the described step (), groove length a=20-40mm, depth of groove t=1-4mm.
3. a kind of anticorrosive steel pipeline according to claim 1 is exempted from the method for internal joint patch weldering, it is characterized in that: corrosion resistant alloy material (3) comprises stainless steel or nickel-base alloy bare welding filler metal in the described step ().
4. a kind of anticorrosive steel pipeline according to claim 1 is exempted from the method for internal joint patch weldering, it is characterized in that: the overlay length in the described step (three) between corrosion-inhibiting coating (5) and the overlay cladding (3) is 8-10mm.
5. a kind of anticorrosive steel pipeline according to claim 1 is exempted from the method for internal joint patch weldering, it is characterized in that: residue overlay cladding length should be more than 18mm after the machining in the described step (three), and overlay cladding is consistent with internal diameter of tube body.
6. a kind of anticorrosive steel pipeline according to claim 1 is exempted from the method for internal joint patch weldering, it is characterized in that: the packing material of described step (four) select with step () in identical corrosion resistant alloy material, comprise stainless steel or nickel-base alloy bare welding filler metal.
7. a kind of anticorrosive steel pipeline according to claim 1 is exempted from the method for internal joint patch weldering, it is characterized in that: in the described step (four) during argon tungsten-arc welding or apply cooling provision near the anticorrosive coat edge.
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| CN201210514544.0A CN103008988B (en) | 2013-01-04 | 2013-01-04 | The method of internal joint patch weldering exempted from by a kind of anticorrosive steel pipeline |
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| CN201210514544.0A CN103008988B (en) | 2013-01-04 | 2013-01-04 | The method of internal joint patch weldering exempted from by a kind of anticorrosive steel pipeline |
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| CN103008988B CN103008988B (en) | 2016-03-23 |
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| CN103192191A (en) * | 2013-04-07 | 2013-07-10 | 苏州热工研究院有限公司 | Method for improving corrosion resistance of metal welding joint contacting with corrosive media |
| CN103358043A (en) * | 2013-07-30 | 2013-10-23 | 中国核动力研究设计院 | Connection structure, nuclear reaction instrument bushing, secondary supporting column and welding method |
| CN103862145A (en) * | 2014-03-07 | 2014-06-18 | 中国石油大学(华东) | Butt welding method of pipeline lined with coating |
| CN104139283A (en) * | 2014-08-01 | 2014-11-12 | 中国水利水电第十工程局有限公司 | Method for manufacturing pressure backfilling type pipeline |
| CN104308364A (en) * | 2014-09-05 | 2015-01-28 | 南京煜宸激光科技有限公司 | Horizontal-8-shaped mould laser welding method |
| CN105351635A (en) * | 2015-08-26 | 2016-02-24 | 杨永利 | Metal-ceramic composite pipe and manufacturing process thereof |
| CN105772904A (en) * | 2016-05-14 | 2016-07-20 | 山西阳煤化工机械（集团）有限公司 | Butt welding method of small-diameter composite pipes |
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| WO2018172643A1 (en) * | 2017-03-20 | 2018-09-27 | Saipem S.A. | Process for lining a steel pipe for the subsea transport of fluids |
| US10648607B2 (en) | 2017-03-20 | 2020-05-12 | Saipem S.A. | Process for lining a steel pipe for the subsea transport of fluids |
| CN106964909A (en) * | 2017-03-22 | 2017-07-21 | 山东胜利长龙管道科技有限公司 | Pre- repaired mouth cermet（DSHS）Inside cover the manufacture method of steel pipe |
| CN106964909B (en) * | 2017-03-22 | 2018-12-25 | 山东胜利长龙管道科技有限公司 | The manufacturing method of steel pipe is covered in pre- repaired mouth cermet |
| CN107052519A (en) * | 2017-04-10 | 2017-08-18 | 中国石油集团工程技术研究院 | A kind of nearly current potential stainless steel overlaying method of pre- repaired mouth solid solution transition of steel pipe weld bond |
| CN113785151A (en) * | 2019-04-29 | 2021-12-10 | Sms集团有限公司 | Metal pipe, in particular a pipe for transporting oil and gas, having a metal coating in the transition region |
| DE102020128145A1 (en) | 2020-10-26 | 2022-04-28 | Inprocoat Holding Gmbh | PIPE SECTION AND METHOD OF MAKING AN INTERIOR COATING FOR SUCH |
| CN112427827A (en) * | 2020-11-09 | 2021-03-02 | 上海市基础工程集团有限公司 | Nondestructive welding method for large-diameter plastic-coated steel pipe |
| CN113333948A (en) * | 2021-05-26 | 2021-09-03 | 鞍钢钢材加工配送（长春）有限公司 | Processing method and welding method of steel blank with aluminum-silicon coating |
| CN113319466A (en) * | 2021-06-15 | 2021-08-31 | 磐固合金(常州)有限公司 | Surfacing welding method for inner wall of thin-wall cylinder |
| WO2023194536A1 (en) * | 2022-04-08 | 2023-10-12 | Framatome | Method for welding two pipes to each other, and corresponding pipework |
| FR3134324A1 (en) * | 2022-04-08 | 2023-10-13 | Framatome | Process for welding two conduits together, corresponding piping |
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