CN1066410A - Small diameter steel pipeline welded joint district inner wall anti-corrosive welding jointing method and device - Google Patents
Small diameter steel pipeline welded joint district inner wall anti-corrosive welding jointing method and device Download PDFInfo
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- CN1066410A CN1066410A CN 92103755 CN92103755A CN1066410A CN 1066410 A CN1066410 A CN 1066410A CN 92103755 CN92103755 CN 92103755 CN 92103755 A CN92103755 A CN 92103755A CN 1066410 A CN1066410 A CN 1066410A
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Abstract
The present invention relates to a kind of small diameter steel pipeline welded joint district inner wall anti-corrosive welding jointing method and device.It is characterized in that using nickel-base alloy powder powder material surfacing that the long-pending remodeling spray welding gun that roller is housed that increases of powder bucket capacity will contain molybdenum in the steel tube end part inwall, use the stainless steel electrode that contains molybdenum to adopt single face welding and double face shaping to carry out back welding.This method and apparatus has that incomplete fusion zone alloy dilution ratio is low, corrosion resistance is high, with steel pipe bond strength height, anticorrosion continuously and characteristics such as welding gun smooth operation.Be applicable to small-bore, endless inner wall of steel pipe anticorrosion welding repaired mouth processing.
Description
The invention belongs to welding technology field, relate to a kind of small diameter steel pipeline welded joint near region inner wall anti-corrosive welding jointing method and device.
In order to prolong the service life of saline and alkaline regional steel pipe, the home and abroad has all been adopted steel pipe inner and outer walls has been carried out the corrosion-resistant technological measure.Because when installation, need to adopt welding procedure that each steel pipe is tied, but because of the connector area weld seam self exposes without anticorrosion, can form heavy corrosion, and in the commissure and heat affected area place destroy or form slag inclusion because of welding causes anticorrosion organic coating to be burnt, make pipeline corrosion protection discontinuous, influence the service life of steel pipe.So must carry out the welding repaired mouth processing of corrosion-inhibiting coating to weld region.United States Patent (USP) 4611833 has disclosed a kind of spray coating alloy inside pipe wall that contains chromium, nickel, cobalt, iron that adopts in pipe end 0.5-3 times diameter range, carry out the skewed slot fillet welding with identical materials again and finish the weld seam ground floor, the skewed slot remainder adopts the technology of filling with the fusion of pipeline same material, this alloy material and technology are under normal conditions, the weld seam bottom of ferrous alloy spray welding layer and identical composition be difficult for to guarantee its anti-corrosive properties at incomplete fusion zone, and this oxygen one alkynes flame (compressed air sprayed coating technology is applicable to the pipeline of φ 200mm caliber or bigger caliber by Scoupe.For small-bore pipeline, the inner wall anti-corrosive welding repaired mouth of long pipeline and last weld bond of any long lines (dead mouthful weld seam) then can't be realized.
The purpose of this invention is to provide a kind of high temperature resistant, corrosion-resistant, wear-resisting Nickel-based Alloy Welding material that adopts, guarantee anticorrosion continuity, improve the method for the steel pipe weld region inner wall anti-corrosive welding repaired mouth in steel pipe service life.
Another object of the present invention provides a kind of remodeling powder spray gun small-bore, that endless steel pipe weld region inner wall anti-corrosive welding repaired mouth uses that solves.
Technical scheme of the present invention is: small diameter steel pipeline welded joint district inner wall anti-corrosive welding jointing method comprises antirust coat spraying, processing steps such as melting welding connection.This method is that feature realizes with following process steps and prescription.
1, processing step: at first use remodeling powder spray gun heating remelting nickel base self-fluxing alloy powder and surfacing in the pipe end inwall, use the chromium nickel stainless steel welding rod that contains molybdenum to adopt single face welding and double face shaping technology that pipeline is carried out weld seam bottoming welding then at the scene, on the weld seam bottom, carry out the front cover weldering at last with the high-strength structure steel electrode.
2, single face welding and double face shaping technology: welding rod near groove bottom spray-welding coating place, is carried out both sides swing welding with small electric stream,, and, reach the weld seam negative shape by the welding sequence welding of overhead welding, vertical position welding, downhand welding all partly puncturing the method arc manipulation.
3, prescription (weight %):
Nickel base self-fluxing alloy powder consist of carbon 0.1-0.5%, chromium 18-25%, molybdenum 2-5%, silicon 2-3%, all the other are nickel.
Weld seam bottoming welding consists of carbon 0.1-0.3% with stainless steel electrode, chromium 20-28%, and molybdenum 2-3%, silicon 0.5-2.5%, nickel 16-22%, all the other are iron.
Another technical scheme of the present invention is: a kind of remodeling spray welding gun for realizing that small diameter steel pipeline welded joint district inner wall anti-corrosive welding jointing method uses, and by powder bucket 3, flexible pipe 4, powder bucket support 5, spray gun 6 compositions such as grade.It is characterized in that on powder bucket 3, being equipped with magnetizing coil 1, needle-valve 2, and increase the volume of powder bucket 3; With the contraction in length of the nozzle bend pipe 7 of spray gun 6 front ends half; And spray gun 6 is bound up on by hinge bar 8 adjusts on the cover 9, adjust cover 9 and be fixed on roller 11 is housed, on the base plate 10 of guide rail 12.
The invention will be further described below in conjunction with embodiments of the invention and accompanying drawing, and this embodiment is only in order to explaining invention, but do not think limitation of the present invention.
Fig. 1 is weld region inner wall anti-corrosive welding repaired mouth structural representation.
Fig. 2 is weld region inner wall anti-corrosive welding repaired mouth generalized section.
Fig. 3 is remodeling oxy-acetylene powder spray gun structural representation.
Fig. 4 is the cyclic water jacket structural representation of cooling back installation.
Fig. 5 is the temperature controlled water tank schematic diagram of cooling back installation.
Fig. 6 closely stitches the metallographic structure figure in district for weld seam.
Small diameter steel pipeline welded joint district inner wall anti-corrosive welding jointing method comprises following processing step: at first give system factory with 20# steel tube end part bevelling and the inner surface of steel tube end part 40-50mm scope and root face place purified treatment (sandblast or polishing rust cleaning) back with the thick corrosion-and high-temp-resistant of oxy-acetylene powder spray gun surfacing one deck 0.3-0.7mm of retrofiting, the wear-resisting molybdenum nickel base self-fluxing alloy powder (as Fig. 1) that contains, its composition (weight %) is a carbon 0.4%, chromium 25%, molybdenum 2%, silicon 3%, all the other are nickel (iron only exists as impurity).After bevel for welding and pipe end position loaded onto the groove protective sleeve whole steel pipe carried out blasting treatment, steel pipe inwall remainder adopts organic coating or inorganic coating coating and overlaps with the pipe end alloy spray welding overlay.Outer wall of steel pipe is sprayed pitch and twine the glass wool cloth protection, transport the job site to after inspection inwall spray-welding coating and the external anti-corrosion layer quality.When at the scene welding being installed; take off the groove protective sleeve, aim at pipe and weld prelocalization, and at weld bond both sides dress cooling back installation (as Fig. 4) (surfacing length can not adorned less than 50mm); the heat affected area temperature is descended, guarantee that organic coating is not destroyed in lap-joint.In the temperature controlled water tank of cooling back installation (as Fig. 5) heater is housed, the water temperature during with the assurance winter construction.Be carbon 0.1%, chromium 27%, molybdenum 3% with forming (weight %) then, silicon 1%, nickel 20%, all the other feel secure and weld (as Fig. 2) for the chromium nickel stainless steel welding rod of iron (or with above composition welding wire, carry out argon arc welding) carries out single face welding and double face shaping technology.This technology is two semicircle weld bonds that annular weld bond are divided into symmetry, earlier hemicycle has been welded by overhead welding, vertical position welding, downhand welding order and has welded other hemicycle again.The stainless steel uranami welding electrode is made small sway near spray-welding coating place, groove bottom with less electric current, make the spray-welding coating fusing of groove both sides, form the molten bath, and then welding forward, all, so just reach the purpose of weld seam negative shape partly to puncture the method arc manipulation.This process makes weld seam incomplete fusion zone alloy dilution ratio low, the corrosion resistance height.The metallographic structure that weld seam closely stitches the district is austenite+alloy carbide+eutectic carbide (as Fig. 6); 2 districts are protected by the austenitic alloy that 3 district's Ni based spray-welded alloys and 1 district contain molybdenum by 20# steel pipe mother metal, have guaranteed the anticorrosion continuity of last fusion zone and the high strength of weld seam.Thereby improved the resistance to corrosion of 20# steel.Carry out front cover weldering (as Fig. 2) at the weld seam bottom with fourth 507 high-strength structure steel electrodes at last.Unload cooling device, at weld metal and external diameter of pipe heat affected area place coating organic coating and twine glass wool cloth and carry out outer corrosion-resistanting interpolating port processing.Reach small-bore, the successional purpose of the pipeline corrosion protection of endless.Adopt the steel pipe of said method welding, soak through 3% sodium chloride solution, soak room temperature corrosion test 5000 hours and through 3% sodium chloride solution, 80 ℃ of temperature corrosion tests 2000 hours, the weld seam corrosion resistance was more than five times of structural steel weld seam.What this process was better than United States Patent (USP) 4611833 propositions is coating material with the ferrous alloy, adopts the method for fillet welding welded stub connection.
Spray welding gun of the present invention is to have done improvement (as Fig. 3) on the structure of existing spray welding gun.This rifle is made up of powder bucket 3, flexible pipe 4, powder bucket support 5, spray gun 6 etc.Improvement part is that magnetizing coil 1, needle-valve 2 are installed on powder bucket 3, and has increased the volume of powder bucket 3, and is long-pending bigger 8 times than common flour bucket capacity, is suitable for requirements of large-scale production.And magnetizing coil 1 generation vibration drive needle-valve 2 does not cause the powder hole plug.Also with the contraction in length of the nozzle bend pipe 7 of spray gun 6 front ends half, inner surface that can small-bore, the dark 0-160mm steel pipe of surfacing.And spray gun 6 is bound up on by hinge bar 8 adjusts on the cover 9, adjust cover 9 and be fixed on the base plate 10 that roller 11 guide rails 12 are installed, can do arbitrarily angled adjustment on a vertical plane, become manual operations and operate into half mechanical balance, improved working condition.
The present invention has the following advantages:
1, adopts nickel-base alloy and the single face welding and double face shaping technology that contains molybdenum, make weld seam incomplete fusion zone alloy dilution ratio low, the corrosion resistance height has solved Steel Welded Joint district inner wall anti-corrosive continuity problem, has improved the service life that steel pipe is worked in corrosive medium.
2, the bonding layer of spray-welding coating and organic coating anti--40-40 ℃ condition under cold and hot fatigue, with steel pipe bond strength height.
3, the employing spray welding technology can be to φ 60-89mm diameter, and endless Steel Welded Joint district carries out inner wall anti-corrosive welding repaired mouth and processes.
4, the powder spray gun flexible operation of remodeling, steady has alleviated workman's labour intensity, the needs that are suitable for producing in enormous quantities.
Claims (2)
1, a kind of steel pipe weld region inner wall anti-corrosive welding jointing method comprises processing steps such as antirust coat spraying, melting welding connection, it is characterized in that this method is that feature realizes with following process steps and prescription:
(1) processing step: at first use remodeling powder spray welding gun heating remelting nickel base self-fluxing alloy powder and surfacing in the pipe end inwall, use the chromium nickel stainless steel welding rod that contains molybdenum to adopt single face welding and double face shaping technology that pipeline is carried out weld seam bottoming welding then at the scene, on the weld seam bottom, carry out the front cover weldering at last with the high-strength structure steel electrode;
(2) single face welding and double face shaping technology: welding rod near groove bottom spray-welding coating place, is carried out both sides swing welding with small electric stream,, and, reach the weld seam negative shape by the welding sequence welding of overhead welding, vertical position welding, downhand welding all partly puncturing the method arc manipulation;
(3) prescription (weight %):
Nickel base self-fluxing alloy powder consist of carbon 0.1-0.5%, chromium 18-25%, molybdenum 2-5%, silicon 2-3%, all the other are nickel;
Weld seam bottoming welding consists of carbon 0.1-0.3% with stainless steel electrode, chromium 20-28%, and molybdenum 2-3%, silicon 0.5-2.5%, nickel 16-22%, all the other are iron.
2, a kind of remodeling spray welding gun for using the described method of claim 1 to design, by powder bucket 3, flexible pipe 4, compositions such as powder bucket support 5, spray gun 6 is characterized in that being equipped with magnetizing coil 1, needle-valve 2 on powder bucket 3, and increase the volume of powder bucket 3; With the contraction in length of the nozzle bend pipe 7 of spray gun 6 front ends half; Spray gun 6 is bound up on the adjustment cover 9 by hinge bar 8, adjusts cover 9 and be fixed on the base plate 10 that roller 11, guide rail 12 are housed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92103755 CN1024173C (en) | 1992-05-21 | 1992-05-21 | Anticorrosion weld repairing method for inner wall of welded joint region of small diameter steel pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92103755 CN1024173C (en) | 1992-05-21 | 1992-05-21 | Anticorrosion weld repairing method for inner wall of welded joint region of small diameter steel pipeline |
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| Publication Number | Publication Date |
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| CN1066410A true CN1066410A (en) | 1992-11-25 |
| CN1024173C CN1024173C (en) | 1994-04-13 |
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| CN 92103755 Expired - Fee Related CN1024173C (en) | 1992-05-21 | 1992-05-21 | Anticorrosion weld repairing method for inner wall of welded joint region of small diameter steel pipeline |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070098C (en) * | 1997-09-23 | 2001-08-29 | 石油大学(华东) | Welding process for replacing corrosionproof treatment of metal welding |
| CN100464920C (en) * | 2005-06-23 | 2009-03-04 | 上海锅炉厂有限公司 | Obstacle-free butt welding method for straight pipe with small diameter |
| CN100464919C (en) * | 2005-06-23 | 2009-03-04 | 上海锅炉厂有限公司 | 45 DEG all-position back-sealing butt welding method for pipe with small diameter |
| CN100563896C (en) * | 2004-05-18 | 2009-12-02 | 斯内克马公司 | The TIG welding method |
| CN103008988A (en) * | 2013-01-04 | 2013-04-03 | 哈尔滨工业大学 | Method for welding anticorrosion steel pipeline with no internal repaired mouth |
| CN103231148A (en) * | 2013-05-03 | 2013-08-07 | 胜利油田金岛工程安装有限责任公司 | Corrosion-preventing processing method for pipe end of inner lining glass corrosion-preventing steel pipe |
| CN103822031A (en) * | 2013-05-03 | 2014-05-28 | 胜利油田金岛工程安装有限责任公司 | Glass-lined anti-corrosion steel pipe producing and welding processes |
| CN103862145A (en) * | 2014-03-07 | 2014-06-18 | 中国石油大学(华东) | Butt welding method of pipeline lined with coating |
| CN111515565A (en) * | 2020-06-03 | 2020-08-11 | 黄超明 | Stainless steel pipe inner weld joint corrosion-resistant reinforcing welding method |
| WO2023152227A1 (en) * | 2022-02-11 | 2023-08-17 | Sms Group Gmbh | Pipe section, pipe assembly, method for manufacturing a pipe section, and use of a pipe assembly |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100413629C (en) * | 2006-11-22 | 2008-08-27 | 山东大学 | Process for welding 800MPa high-strength steel without preheating |
| CN101368660A (en) * | 2008-10-16 | 2009-02-18 | 吴发东 | Mouth compensating method for pipeline corrosion protection layer and integrated mouth compensating machine |
-
1992
- 1992-05-21 CN CN 92103755 patent/CN1024173C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070098C (en) * | 1997-09-23 | 2001-08-29 | 石油大学(华东) | Welding process for replacing corrosionproof treatment of metal welding |
| CN100563896C (en) * | 2004-05-18 | 2009-12-02 | 斯内克马公司 | The TIG welding method |
| CN100464920C (en) * | 2005-06-23 | 2009-03-04 | 上海锅炉厂有限公司 | Obstacle-free butt welding method for straight pipe with small diameter |
| CN100464919C (en) * | 2005-06-23 | 2009-03-04 | 上海锅炉厂有限公司 | 45 DEG all-position back-sealing butt welding method for pipe with small diameter |
| CN103008988A (en) * | 2013-01-04 | 2013-04-03 | 哈尔滨工业大学 | Method for welding anticorrosion steel pipeline with no internal repaired mouth |
| CN103231148A (en) * | 2013-05-03 | 2013-08-07 | 胜利油田金岛工程安装有限责任公司 | Corrosion-preventing processing method for pipe end of inner lining glass corrosion-preventing steel pipe |
| CN103822031A (en) * | 2013-05-03 | 2014-05-28 | 胜利油田金岛工程安装有限责任公司 | Glass-lined anti-corrosion steel pipe producing and welding processes |
| CN103862145A (en) * | 2014-03-07 | 2014-06-18 | 中国石油大学(华东) | Butt welding method of pipeline lined with coating |
| CN103862145B (en) * | 2014-03-07 | 2016-03-09 | 中国石油大学(华东) | A kind of duct butt-welding method of lining coating pipeline |
| CN111515565A (en) * | 2020-06-03 | 2020-08-11 | 黄超明 | Stainless steel pipe inner weld joint corrosion-resistant reinforcing welding method |
| WO2023152227A1 (en) * | 2022-02-11 | 2023-08-17 | Sms Group Gmbh | Pipe section, pipe assembly, method for manufacturing a pipe section, and use of a pipe assembly |
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| Publication number | Publication date |
|---|---|
| CN1024173C (en) | 1994-04-13 |
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