CN1024173C - Anticorrosion weld repairing method for inner wall of welded joint region of small diameter steel pipeline - Google Patents
Anticorrosion weld repairing method for inner wall of welded joint region of small diameter steel pipeline Download PDFInfo
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- CN1024173C CN1024173C CN 92103755 CN92103755A CN1024173C CN 1024173 C CN1024173 C CN 1024173C CN 92103755 CN92103755 CN 92103755 CN 92103755 A CN92103755 A CN 92103755A CN 1024173 C CN1024173 C CN 1024173C
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Abstract
The present invention relates to a corrosion preventing welding repairing method of the inner wall of a welding joint zone of a small-caliber steel pipeline and a device thereof. The present invention is characterized in that an improved spraying welding gun which is provided with a volume-increased powder bucket and a roller is used to spray and weld nickel base alloy powder material containing molybdenum on the inner wall of the end of a steel pipe; a stainless steel electrode containing the molybdenum is used to carry out backing welding by adopting single-surface welding for double-surface molding. The present invention has the characteristics of low dilution ratio of incomplete fusion zone alloy, high corrosion resistance, high binding strength between the powder material and the steel pipe, successive corrosion prevention, stable operation of the welding gun, etc. The present invention is suitable for the corrosion preventing welding repairing processing of the inner wall of the small-caliber steel pipeline which has infinite length.
Description
The application's small diameter steel pipeline welded joint district inner wall anti-corrosive welding jointing method belongs to the field of steel pipe welded joint near region inner wall anti-corrosive welding repaired mouth.
In order to prolong the working 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 weld joint and heat affected zone place destroy or form slag inclusion because of welding causes anticorrosion organic coating to be burnt, make pipeline corrosion protection discontinuous, influence the working life of steel pipe.So must carry out the welding repaired mouth processing of corrosion-inhibiting coating to weld region.U. S. Patent 4611833 has disclosed and has a kind ofly contained chromium adopting in pipe end 0.5-3 times of diameter length scope, nickel, cobalt, the spray coating alloy inner tube wall of iron, use again and carry out the skewed slot fillet welding with the tubing identical materials and finish the weld seam first layer, the skewed slot remaining part 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 is many because of the weld bond metal molten, be difficult for to guarantee its anti-corrosive properties at incomplete fusion zone, and this oxygen one alkynes flame (pressurized 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 working 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.
Technological scheme of the present invention is: small diameter steel pipeline welded joint district inner wall anti-corrosive welding jointing method be at first in pipe apart from the tube end certain distance in a kind of stainless steel of surfacing, carry out the melting welding connection at last.This method is that feature realizes with following process steps and prescription.
A kind of steel pipe weld region inner wall anti-corrosive welding jointing method, at first in pipe in the tube end certain distance a kind of stainless steel of surfacing, carry out melting welding at last and connect, it is characterized in that this method is the feature realization with following process steps and prescription:
(1) at first with remodeling powder spray gun heating remelting nickel base self-fluxing alloy powder, its component (weight %) is carbon 0.1-0.5%, chromium 18-25%, and molybdenum 2-5%, silicon 2-3%, all the other are nickel; In pipe end inwall 40-50mm scope, thickness is 0.3-0.7mm with its surfacing;
(2) use the chromium nickel stainless steel welding rod that contains molybdenum then at the scene, its component (weight %) is carbon 0.1-0.3%, chromium 20-28%, and molybdenum 2-3%, silicon 0.5-2.5%, nickel 16-22%, all the other are iron; Adopt single face welding and double face shaping technology that pipeline is carried out weld seam bottoming welding; Welding method be with welding rod near groove bottom spray-welding coating place, carry out both sides swing welding with less electric current, all partly puncturing the method arc manipulation, and weld by the welding sequence of overhead welding, vertical position welding, downhand welding, reach the weld seam negative shape.
Another technological 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 field coil 1, needle-valve 2, and increase powder bucket 3 the volume octuple (with general powder bucket relatively) with the shorten length 1/2(of the nozzle bend pipe 7 of spray gun 6 front ends and general nozzle bend pipe relatively); 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 the anticorrosion welding repaired mouth of a weld region wind wall generalized section.
Fig. 3 is remodeling oxyacetylene powder spray gun structural representation.
Fig. 4 is the cyclic water jacket structural representation of circulating cooler.
Fig. 5 is the temperature controlled water tank schematic representation of circulating cooler.
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 process step: at first give system factory with 20# steel tube end part bevelling and the internal 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 oxyacetylene 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 protecting jacket whole steel pipe carried out sand blast, steel pipe inwall remaining part 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 fibre 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 protecting jacket, aim at pipe and weld prelocalization, and at weld bond both sides dress circulating cooler (as Fig. 4) (surfacing length can not adorned greater than 50mm); the heat affected zone temperature is descended, guarantee that organic coating is not destroyed in lap-joint.In the temperature controlled water tank of circulating cooler (as Fig. 5) heater is housed, the water temperature during with the assurance winter construction.Be carbon 0.1% with forming (weight %) then, chromium 27%, molybdenum 3%, 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 technological method 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 incomplete fusion zone and the high strength of weld seam.Thereby improved the anti-corrosion capacity of 20# steel.Carry out front cover weldering (as Fig. 2) at the weld seam bottom with J507 high-strength structure Steel Electrode at last.Unload cooling unit, at weld metal and external diameter of pipe heat affected zone place coating organic coating and twine glass fibre 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 technological method was better than U. S. Patent 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 field 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 field coil 1 generation vibration drive needle-valve 2 does not cause the powder hole plug.Also relatively), internal surface that can small-bore, the dark 0-160mm steel pipe of surfacing with the shorten length 1/2(of the nozzle bend pipe 7 of spray gun 6 front ends and general nozzle bend pipe.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 into half mechanical quiet run, 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 the anticorrosion continuity problem of Steel Welded Joint district inwall, 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 small-bore such as Φ 60-89mm diameter, and endless Steel Welded Joint district carries out the anticorrosion welding repaired mouth of inwall 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, at first in pipe in the tube end certain distance a kind of stainless steel of surfacing, carry out melting welding at last and connect, it is characterized in that this method is the feature realization with following process steps and prescription:
(1) at first with remodeling powder spray gun heating remelting nickel base self-fluxing alloy powder, its component (weight %) is carbon 0.1-0.5%, chromium 18-25%, and molybdenum 2-5%, silicon 2-3%, all the other are nickel; In pipe end inwall 40-50mm scope, thickness is 0.3-0.7mm with its surfacing;
(2) use the chromium nickel stainless steel welding rod that contains molybdenum then at the scene, its component (weight %) is carbon 0.1-0.3%, chromium 20-28%, and molybdenum 2-3%, silicon 0.5-2.5%, nickel 16-22%, all the other are iron; Adopt single face welding and double face shaping technology that pipeline is carried out weld seam bottoming welding; Welding method be with welding rod near groove bottom spray-welding coating place, carry out both sides swing welding with less electric current, all partly puncturing the method arc manipulation, and weld by the welding sequence of overhead welding, vertical position welding, downhand welding, reach the weld seam negative shape.
2, a kind of remodeling spray welding gun for using the described method of claim 1 to design, form by powder bucket (3), flexible pipe (4), powder bucket support (5), spray gun (6) etc., it is characterized in that on powder bucket (3), being equipped with excitatory property coil (1), needle-valve (2), and the volume octuple of increase powder bucket (3) (comparing) with general powder bucket; With the shorten length 1/2(of the nozzle bend pipe (7) of spray gun (6) front end and general nozzle bend pipe relatively); Spray gun (6) is bound up on the adjustment cover (9) by hinge bar (8), and adjustment cover (9) is fixed on roller (11) is housed, on the base plate (10) of guide rail (12).
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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
|---|---|
| CN1066410A CN1066410A (en) | 1992-11-25 |
| CN1024173C true 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 (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 |
| CN101504104B (en) * | 2008-10-16 | 2013-07-10 | 吴发东 | Mouth compensating method for pipeline corrosion protection layer and integrated mouth compensating machine |
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| CN1070098C (en) * | 1997-09-23 | 2001-08-29 | 石油大学(华东) | Welding process for replacing corrosionproof treatment of metal welding |
| FR2870470B1 (en) * | 2004-05-18 | 2007-09-28 | Snecma Moteurs Sa | TIG WELDING PROCESS |
| 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 |
| 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 |
| CN103008988B (en) * | 2013-01-04 | 2016-03-23 | 哈尔滨工业大学 | The method of internal joint patch weldering exempted from by a kind of anticorrosive steel pipeline |
| CN103822031B (en) * | 2013-05-03 | 2016-02-24 | 胜利油田金岛工程安装有限责任公司 | The preparation process of glass inner-lining anti-corrosive steel tube and welding procedure |
| 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 |
| 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 |
| CN111515565B (en) * | 2020-06-03 | 2021-09-17 | 江西正好不锈钢有限公司 | Stainless steel pipe inner weld joint corrosion-resistant reinforcing welding method |
| DE102022103244A1 (en) * | 2022-02-11 | 2023-08-17 | Sms Group Gmbh | Pipe section, pipe assembly, manufacturing method for pipe section and pipe assembly and use of a pipe assembly |
-
1992
- 1992-05-21 CN CN 92103755 patent/CN1024173C/en not_active Expired - Fee Related
Cited By (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 |
| CN101504104B (en) * | 2008-10-16 | 2013-07-10 | 吴发东 | Mouth compensating method for pipeline corrosion protection layer and integrated mouth compensating machine |
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| Publication number | Publication date |
|---|---|
| CN1066410A (en) | 1992-11-25 |
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