CN103008988B - The method of internal joint patch weldering exempted from by a kind of anticorrosive steel pipeline - Google Patents
The method of internal joint patch weldering exempted from by a kind of anticorrosive steel pipeline Download PDFInfo
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Abstract
The invention provides a kind of method that internal joint patch weldering exempted from by anticorrosive steel pipeline, be suitable for the preservative treatment of oil, chemical industry band anticorrosive coated steel pipeline welded joint.Its main points are first processing the groove with certain length and the degree of depth apart from steel tube end part a distance; and on groove built-up welding corrosion resistant alloy material; the steel tube end part of heap postwelding is processed into double V-groove; at the corrosion-inhibiting coating of pipe inner-wall spraying adequate thickness; corrosion-inhibiting coating covers corrosion resistant alloy overlay cladding sufficient length; again by two steel pipe docking; layering welding is implemented after some fixed bit; welding method selects argon tungsten-arc welding; the corrosion resistant alloy material identical with during built-up welding selected by packing material, carries out argon-filled protection in welding process in pipe.Internal joint patch new welding technology exempted from by a kind of anticorrosive steel pipeline provided by the invention, inner-walls of duct and weld bond resistance to corrosion can be ensured, eliminate the on-the-spot internal joint patch technique of postwelding, there is construction simple, the feature of dependable performance, is suitable for oil, chemical field practical engineering application.
Description
Technical field
The present invention relates to pipeline welding technical field, be specifically related to a kind of method that internal joint patch weldering exempted from by anticorrosive steel pipeline.
Background technology
Most domestic oil gas field contains CO
2, H
2the Korrosionsmediums such as S, easily cause corrosive pipeline in oil-gas gathering and transportation process, cause leakage accident.The field steel pipes such as usual oil, chemical industry need to carry out inside and outside anticorrosion to improve its resistance to corrosion, extend the service life of pipeline, reduce the generation of leakage accident.Carry out butt welding more at the scene after general spraying operation that is organic or inorganic anti-corrosion layer is prefabricated in the factory and become long lines.Easily cause the corrosion-inhibiting coating near weld seam to lose efficacy owing to welding pyroprocess during butt welding, need postwelding at inwall commissure coating corrosion-inhibiting coating and internal joint patch, make up the harmful effect of welding process to coating antiseptic performance near inwall weld metal zone.
Common jointing method has commissure punching to put in hairbrush benefit brush applied coating and heavy-caliber pipeline adopts remote operated vehicle in-line portion to carry out the methods such as repaired mouth, but these methods not easily accurately control, technical sophistication, and due to the restriction of site operation process condition, repaired mouth difficult quality guarantee, cause the service life of pipeline to shorten dramatically, the economic loss brought by pipeline corrosion leak is increasing.
Domestic scholars has carried out a large amount of research work to the welding of corrosion-resistant steel pipeline and repaired mouth problem.China Patent Publication No. is that the patent of CN1110385A provides a kind of antiseptic steel pipe technology non-repairing inner and outer orifice, first the method for the method explosive welding welds the preceding paragraph stainless steel inner lining and outer tube in pipe ends, then the method welding liner, pipeline body and the outer tube that adopt layering to weld.The weak point of this method is, first, this technical matters is more complicated, and the bond strength of liner and pipeline body is difficult to ensure.Secondly, the method makes butt welding of pipelines process become the welding of metal composite pipe, and what be difficult to avoid introduces new Welding Problems, directly opens double V-groove, due to inner liner thinner thickness, easily burns, and during bottoming, matrix easily produces backing run and pollutes.China Patent Publication No. is that the patent of CN202419038U also provides corrosion-resistanting interpolating port technology in a kind of pipe lining corrosion resistant alloy, but there is 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 liner.China Patent Publication No. be two patents of CN201615318U and CN2804559Y provide separately a kind of by arrange adapter sleeve, anti-corrosive cover, collet method save internal joint patch step, but these two kinds of procedures are more complicated, and be connected between anti-corrosive cover with pipe matrix not firm.China Patent Publication No. is a kind of method that the patent of CN102003581A provides that mode arranging connecting portion by pipe end removes postwelding internal joint patch from, the connecting portion of the method need carry out the shaping or casting of jumping-up to pipeline and realize, and connecting portion end face anticorrosive coat is physical contact during pipeline docking, there is gap in what be difficult to avoid, 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 inner-wall spraying corrosion-inhibiting coating, this technology postwelding is without the need to carrying out internal joint patch process, practical, is suitable for the welding of the field such as oil, chemical industry anticorrosive steel pipeline.
For achieving the above object, the present invention is realized by following steps: comprise built-up welding step, mechanical processing steps, spraying process and butt welding step, concrete steps are as follows:
(1), built-up welding step: process the groove (2) with certain length a and degree of depth t at certain distance b place, steel pipe (1) end, groove two ends rounding, prevent incomplete fusion defect 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 be greater than depth of groove t, ensures that groove (2) fills up by weld metal;
(2), tool procedure of processing: adopt the mode of machining that tube end maching is become docking double V-groove (4);
(3), spraying process: after machine has added, 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 complete two steel pipes of inner-wall spraying corrosion-inhibiting coating (5) connect, along groove circumference point fixed bit, number of welds is chosen according to pipe diameter size; First by overlay cladding (3) through welding during bottoming, then carry out filling and cover welding, welding method selects argon tungsten-arc welding.
The present invention also has following feature:
1, the distance b=5-15mm in described step (), groove length a=20-40mm, depth of groove t=1-4mm.
2, in described step (), corrosion resistant alloy material (3) comprises stainless steel or nickel-base alloy bare welding filler metal.
3, the overlay length in described step (three) between corrosion-inhibiting coating (5) and overlay cladding (3) is 8-10mm.
4, remaining overlay cladding length after machining in described step (three) should at more than 18mm, and overlay cladding is consistent with internal diameter of tube body.
The corrosion resistant alloy material identical with step () selected by the packing material of 5, described step (four), comprises stainless steel or nickel-base alloy bare welding filler metal.
6, cooling provision is applied during argon tungsten-arc welding or at anticorrosive coat adjacent edges in described step (four).
The present invention realize steel pipe exempt from internal joint patch welding principle be, built-up welding one deck corrosion resistant alloy on steel pipe inner wall groove, overlay cladding and steel pipe matrix are metallurgical binding, thus there is the adverse effect brought to butt welding process in gap when avoiding liner and steel pipe matrix mechanical bond.Simultaneously because overlay cladding reserves certain length, make butt welding high-temperature region away from corrosion-inhibiting coating end, avoid coating being burnt and losing antiseptic effect.After butt welding, inner-walls of duct is continuous print corrosion-inhibiting coating and corrosion-resistant alloy layer, and therefore the decay resistance of pipeline accesses abundant guarantee.
Invention effect
Advantage of the present invention is:
(1) built-up welding one deck corrosion resistant alloy in steel pipe inner wall groove, overlay cladding and steel pipe matrix realize metallurgical binding, compared to the method arranging liner, can reduce the generation probability of weld defect in butt welding process.
(2) inboard wall groove reserves certain distance b apart from steel tube end part, ensures that groove two ends body has enough rigidity, effectively reduces the contraction of heap postwelding caliber, body easy centering when making butt welding, reduce unfitness of butt joint, reduce butt welding difficulty, improve welding quality.
(3) built-up welding and butt welding packing material all select corrosion resistant alloy material, and overlay cladding has adequate thickness, have intercepted in steel pipe matrix that the element such as carbon is to the pollution of backing run, and rate of dilution is low.
(4) overlay cladding reserves sufficient length, makes anticorrosive coat end away from butt welding high-temperature region, avoids high temperature and burnt by anticorrosive coat and lost efficacy.Inner-walls of duct is continuous print corrosion-inhibiting coating and corrosion-resistant alloy layer, fully ensure that the corrosion resistance of pipeline.
(5) processes such as built-up welding, machining and inner-wall spraying corrosion-inhibiting coating all can be prefabricated in the factory, and the on-the-spot butt-welding process that only need carry out a steel pipe, substantially increases efficiency, be suitable for practical engineering application.
Accompanying drawing explanation
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 after Fig. 5 butt welding of steel tube;
In 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, b-recess edge is apart from steel tube end part distance, and d-pipe diameter, t-depth of groove, s-corrosion-inhibiting coating covers corrosion resistant alloy overlay cladding length.
Detailed description of the invention
Embodiment 1
The invention provides a kind of steel pipe and exempt from internal joint patch welding method, its concrete implementation step is:
(1) built-up welding step
Be 5mm at steel pipe inner wall apart from end certain distance b, locating machining in advance to go out a degree of depth be t to be 1mm, length a is the groove of 20mm, and groove two ends rounding, prevents incomplete fusion defect from producing.The certain thickness corrosion resistant alloy material of built-up welding on groove, as stainless steel or nickel-base alloy bare welding filler metal etc., overlaying method adopts argon tungsten-arc welding, and overlay cladding thickness should be greater than depth of groove, ensures that groove fills up by weld metal.
(2) mechanical processing steps
After built-up welding, adopt the mode of machining that tube end maching is become V-type butting grooves, should ensure after machining that residue overlay cladding length is at 19mm, overlay cladding is consistent with internal diameter of tube body.
(3) spraying process
After machine has added, 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
Connected by two of inner-wall spraying corrosion-inhibiting coating steel pipes, carry out a fixed bit along groove circumference, number of welds suitably increases and decreases according to pipe diameter size, and tack welding should ensure that two pipes are tried one's best staggered edge free.Implement layering welding after point is solid, by overlay cladding through welding during bottoming, backing welding selects argon tungsten-arc welding to ensure that good reverse side is shaped, and the corrosion resistant alloy material identical with overlay cladding selected by welding material.For reducing the dilution to 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 welding process, for avoiding welding pyroprocess to the adverse effect of anticorrosive coat, under the prerequisite ensureing fully fusion, adopting little specification welding as far as possible, also can apply cooling provision near anticorrosive coat end.
Embodiment 2
The invention provides a kind of steel pipe and exempt from internal joint patch welding method, its concrete implementation step is:
(1) built-up welding step
Be 15mm at steel pipe inner wall apart from end certain distance b, locating machining in advance to go out a degree of depth be t to be 4mm, length a is the groove of 40mm, and groove two ends rounding, prevents incomplete fusion defect from producing.The certain thickness corrosion resistant alloy material of built-up welding on groove, as stainless steel or nickel-base alloy bare welding filler metal etc., overlaying method adopts argon tungsten-arc welding, and overlay cladding thickness should be greater than depth of groove, ensures that groove fills up by weld metal.
(2) mechanical processing steps
After built-up welding, adopt the mode of machining that tube end maching is become V-type butting grooves, should ensure after machining that residue overlay cladding length is at 35mm, overlay cladding is consistent with internal diameter of tube body.
(3) spraying process
After machine has added, 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
Connected by two of inner-wall spraying corrosion-inhibiting coating steel pipes, carry out a fixed bit along groove circumference, number of welds suitably increases and decreases according to pipe diameter size, and tack welding should ensure that two pipes are tried one's best staggered edge free.Implement layering welding after point is solid, by overlay cladding through welding during bottoming, backing welding selects argon tungsten-arc welding to ensure that good reverse side is shaped, and the corrosion resistant alloy material identical with overlay cladding selected by welding material.For reducing the dilution to 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 welding process, for avoiding welding pyroprocess to the adverse effect of anticorrosive coat, under the prerequisite ensureing fully fusion, adopting little specification welding as far as possible, also can apply cooling provision near anticorrosive coat end.
Embodiment 3
Be Φ 76mm at caliber, wall thickness is the Q245R carbon steel piping of 9mm, opening apart from pipe end 10mm place, a length is 22mm, the degree of depth is the groove of 2mm, tungsten argon arc is adopted to be welded in built-up welding corrosion resistant alloy on groove, packing material can select 316L or 625 nickel-base alloy bare welding filler metals, ensures that filling metal fills up groove.Will heap postwelding body end processing V-shaped groove, bevel angle 40 °, remains overlay cladding length 20mm after machining, overlay cladding and inside pipe wall transition smooth.In the polyethylene powders coating that pipe inner-wall spraying one deck 2mm is thick, coating covers surfacing layer metal 10mm.Steel pipe complete for two inner-wall spraying corrosion-inhibiting coatings is connected, carries out point along groove circumference solid, the solid tack weld of every 60 ° of points.First by surfacing layer metal through welding during bottoming, need ensure that good reverse side is shaped, then carry out filling and cover welding, welding method still selects argon tungsten-arc welding, and packing material is used identical with built-up welding, carries out managing interior argon-filled protection in welding process.Built-up welding and butt welding parameter are shown in Table 1, and postwelding can obtain the flawless joint of high-quality, and inner-walls of duct is continuous print corrosion-inhibiting coating and corrosion resistant alloy overlay cladding, and ensure that pipeline has good corrosion resistance, postwelding is without the need to internal joint patch.
Table 1 built-up welding and butt-welding process welding parameter table
Claims (1)
1. the method for internal joint patch weldering exempted from by an anticorrosive steel pipeline, it is characterized in that, method is: be Φ 76mm at caliber, wall thickness is the Q245R carbon steel piping of 9mm, opening apart from pipe end 10mm place, a length is 22mm, the degree of depth is the groove of 2mm, adopt tungsten argon arc to be welded in built-up welding corrosion resistant alloy on groove, packing material selects 316L or 625 nickel-base alloy bare welding filler metals, ensures that filling metal fills up groove; Will heap postwelding body end processing V-shaped groove, bevel angle 40 °, remains overlay cladding length 20mm after machining, overlay cladding and inside pipe wall transition smooth; In the polyethylene powders coating that pipe inner-wall spraying one deck 2mm is thick, coating covers surfacing layer metal 10mm; Steel pipe complete for two inner-wall spraying corrosion-inhibiting coatings is connected, carries out point along groove circumference solid, the solid tack weld of every 60 ° of points; First by surfacing layer metal through welding during bottoming, need ensure that good reverse side is shaped, then carry out filling and cover welding, welding method still selects argon tungsten-arc welding, and packing material is used identical with built-up welding, carries out managing interior argon-filled protection in welding process.
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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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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2839782Y (en) * | 2005-12-01 | 2006-11-22 | 郭衡纲 | Inter-end coating corrosion-resisting alloy joint steel pipe |
| CN202419038U (en) * | 2011-07-16 | 2012-09-05 | 徐天殊 | Internal anticorrosion alloy joint coating for pipeline |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1024173C (en) * | 1992-05-21 | 1994-04-13 | 大庆石油管理局油田建设设计研究院 | Anticorrosion weld repairing method for inner wall of welded joint region of small diameter steel pipeline |
| JPH0929429A (en) * | 1995-07-21 | 1997-02-04 | Toshiba Corp | Welding procedure |
-
2013
- 2013-01-04 CN CN201210514544.0A patent/CN103008988B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2839782Y (en) * | 2005-12-01 | 2006-11-22 | 郭衡纲 | Inter-end coating corrosion-resisting alloy joint steel pipe |
| CN202419038U (en) * | 2011-07-16 | 2012-09-05 | 徐天殊 | Internal anticorrosion alloy joint coating for pipeline |
Non-Patent Citations (1)
| Title |
|---|
| 管道内防腐补口的喷涂焊接法;王青春;《石油工程建设》;19940831(第4期);第36-37页，图2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020221819A1 (en) * | 2019-04-29 | 2020-11-05 | Sms Group Gmbh | Metal pipe, in particular pipe for conveying oil and gas, comprising a metal coating in a transition region |
| RU2807225C2 (en) * | 2019-04-29 | 2023-11-13 | Смс Груп Гмбх | Metal pipe, system of at least two mentioned metal pipes and methods for their production |
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