CN104493330A - Circumferential weld butt welding method of double-metal composite pipe - Google Patents
Circumferential weld butt welding method of double-metal composite pipe Download PDFInfo
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- CN104493330A CN104493330A CN201410645571.0A CN201410645571A CN104493330A CN 104493330 A CN104493330 A CN 104493330A CN 201410645571 A CN201410645571 A CN 201410645571A CN 104493330 A CN104493330 A CN 104493330A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a circumferential weld butt welding method of a double-metal composite pipe. The method includes: forming a welding groove in the carbon steel base pipe of the to-be-welded double-metal composite pipe, wherein the welding groove is V-shaped and forms two notches; using argon tungsten-arc welding to weld a liner pipe so as to form a corrosion-resistant alloy welding area; polishing to smooth the corrosion-resistant alloy welding area after welding, and winding a layer of high-temperature-resistant non-melt layer on the surface of the corrosion-resistant alloy welding area; using manual arc welding to complete the welding of the carbon steel base pipe to form a carbon steel welding area so as to complete the circumferential weld butt welding of the double-metal composite pipe. The method has the advantages that the high-temperature-resistant non-melt layer is introduced between the carbon steel base pipe at the welding connector of the double-metal composite pipe and the corrosion-resistant alloy liner pipe, the carbon steel base pipe is effectively separated from the melting area of the liner pipe due to the fact that the melting point of the high-temperature-resistant non-melt layer is much higher than that of the carbon steel base pipe and the liner pipe, diffusion of the alloy elements of the carbon steel base pipe and the liner pipe is avoided, and weld quality control difficulty is lowered.
Description
[technical field]
The invention belongs to welding technology field, be specifically related to a kind of composite bimetal pipe girth joint to welding method.
[background technology]
Composite bimetal pipe is a kind of is base tube with ordinary carbon steel, with corrosion resistant alloys such as stainless steel, nickel-base alloy, Hastelloys for bushing pipe, and the economical anti-corrosion tubing of one produced by modes such as mechanical spinning, Explosion composite, drawing compound, hydraulic pressure compounds.Its base tube gives full play to the excellent mechanical performance of carbon steel pipe and cheap advantage, and is responsible for pressure-bearing and pipeline rigid support; Internal lining pipe then bears corrosion-resistant effect, and the thickness of internal lining pipe only 0.3-4.0mm saves the cost of tubing effectively.Therefore, composite bimetal pipe is widely used in petroleum gas gathering line, Oil/gas Well sleeve pipe, produced-water reinjection pipeline; Chemical industry heat exchanger tube; The fields such as electric power demineralized water, desulfurization pipeline.
The butt welding of composite bimetal pipe girth joint is one of technological difficulties of composite bimetal pipe, and its welding procedure is complicated simultaneously, needs to carry out strict control to each process procedure and could obtain high-quality joint.Being welded to connect of current composite bimetal pipe performs YB/T5092-2005 and JB/T4747-2002 standard, general employing three layers weldering, first argon arc welding back cover, then weld transition zone, capping is filled in last manual electric arc welding, as shown in Figure 1, wherein, a is soldering and sealing to girth joint welding process, b is backing welding, c is transition weldering, and d is for filling weldering, and e is cosmetic welding.But the welding method of existing composite bimetal pipe needs to carry out strict control to its welding procedure could obtain comparatively satisfied welding quality.Because the chemical composition of base tube and bushing pipe exists significant difference, be subject to the dilution of base tube due to the diffusion bushing pipe of element during fusing thus cause the austenitic stability of weld seam significantly to reduce, phosphorus content increases, simultaneously because austenite recrystallization district is very large, the low melting point eutectic products such as the easy segregation P of intergranular gap, S in molten bath under the effect of tension to crack.Secondly, Elements Diffusion between this base tube and bushing pipe and the diluting effect that causes, can cause the decline of composite bimetal pipe weld seam corrosion resistance, and the region near melt run produces martensitic structure, thus adds the fragility of welding line joint.In addition, in order to stop the phase counterdiffusion of alloying element between base tube with bushing pipe, existing welding method carries out transition weldering after backing welding, and transition weldering belongs to different-metal material welding, this also increases the difficulty of Weld seam quality control.
[summary of the invention]
The object of the invention is to for the deficiencies in the prior art, provide a kind of composite bimetal pipe girth joint to welding method, should by introducing high temperature resistant not crucible zone between the carbon steel base tube and bushing pipe at welding point place, effectively the carbon steel base tube of joint and bushing pipe are kept apart, avoid the many problems of welded quality caused because of the phase counterdiffusion of alloying element between carbon steel base tube and bushing pipe, simplify the welding procedure of composite bimetal pipe, avoid the welding between foreign material, improve welding job efficiency.
For achieving the above object, the present invention adopts following technical scheme:
A kind of composite bimetal pipe girth joint, to welding method, comprises the following steps:
1) to the carbon steel base tube bevelling of composite bimetal pipe to be welded, groove type is double V-groove, and the both sides of double V-groove form two shortcomings, and make the rectangular shape in the bottom of double V-groove, its top is trapezoidal shape;
2) bushing pipe is welded, form corrosion resistant alloy welding zone;
3) by step 2) after the corrosion resistant alloy welding zone that completes welding polishes flat, at the high temperature resistant not crucible zone of its surface wrap one deck;
4) carbon steel base tube has been welded, formed carbon steel welding zone, so far completed the welding of composite bimetal pipe welding neck collar weld seam.
The present invention further improves and is: the fusing point of high temperature resistant not crucible zone is higher than the fusing point more than 300 DEG C of carbon steel base tube and liner material.
The present invention further improves and is: 5% of the thickness≤carbon steel base tube wall thickness of high temperature resistant not crucible zone.
The present invention further improves and is: high temperature resistant not crucible zone covers whole corrosion resistant alloy weld zone, and the fusion zone of isolated carbon steel base tube and bushing pipe.
The present invention further improves and is: the material of high temperature resistant not crucible zone is molybdenum.
The present invention further improves and is: the wall thickness of bushing pipe is 0.3-4.0mm.
The present invention further improves and is: step 2) in, adopt argon tungsten-arc welding to weld bushing pipe with TGS-316L stainless steel argon arc welding wire.
The present invention further improves and is: step 4) in, adopt the mode of manual electric arc welding to be welded by carbon steel base tube.
Compared with prior art, the present invention has following beneficial effect:
The present invention increases a high temperature resistant not crucible zone between the carbon steel base tube and bushing pipe of pipe end to be welded, the fusing point of this is high temperature resistant not crucible zone, far above the fusing point of carbon steel base tube and bushing pipe, effectively prevent mutual interference when the welding of carbon steel base tube is welded with bushing pipe and Elements Diffusion and causes the decline of girth joint place bushing pipe corrosion resistance and mechanical performance.In addition, can there is a radial shortcoming in the left and right sides of the present invention is high temperature resistant not crucible zone, but size of this shortcoming can be controlled by the thickness of high temperature resistant not crucible zone, makes the performance of commissure reach designing requirement.
A kind of composite bimetal pipe girth joint of the present invention, to welding method, possesses following characteristics:
This invention simplifies welding process flow, compared with existing composite bimetal pipe welding procedure, eliminate soldering and sealing and two steps are welded in transition, avoid the welding between foreign material, effectively improve Weld seam quality control level.
The processing of bevel for welding of the present invention is identical with the retaining wall on slope that existing composite bimetal pipe butt welding is welded, and does not also have special requirement to welding equipment and packing material.Therefore, under existing appointed condition, composite bimetal pipe butt welding welding can be carried out to the greatest extent, almost there is no technological transformation cost.
Although non-fusible district exists two shortcomings, the physical dimension of shortcoming can be effectively controlled by the thickness of high temperature resistant not crucible zone, can not cause the reduction of weldquality.
[accompanying drawing explanation]
Fig. 1 is composite bimetal pipe girth joint welding schematic diagram;
In figure: a is soldering and sealing, b is backing welding, and c is transition weldering, and d is for filling weldering, and e is cosmetic welding.
Fig. 2 is composite bimetal pipe girth joint butt welding of the present invention welding schematic diagram;
In figure: 1 is corrosion resistant alloy welding zone, 2 is high temperature resistant not crucible zone, and 3 is carbon steel welding zone, and 4 is shortcoming.
[detailed description of the invention]
Below in conjunction with drawings and Examples, the present invention is described in further details.
See Fig. 2, a kind of composite bimetal pipe girth joint of the present invention is to welding method, and its welding process flow is followed successively by bushing pipe welding, the installation of high temperature resistant not crucible zone and the welding of carbon steel base tube, specifically comprises the following steps:
1) to the carbon steel base tube bevelling of composite bimetal pipe to be welded, groove type is double V-groove, and the both sides of double V-groove form two shortcomings 4, and make the rectangular shape in the bottom of double V-groove, its top is trapezoidal shape;
2) adopt argon tungsten-arc welding to weld bushing pipe with TGS-316L stainless steel argon arc welding wire, form corrosion resistant alloy welding zone 1;
3) by step 1) after the corrosion resistant alloy welding zone 1 that completes welding polishes flat, at the high temperature resistant not crucible zone 2 of its surface wrap one deck;
4) adopt the mode of manual electric arc welding to be welded by carbon steel base tube, form carbon steel welding zone 3, so far complete the welding of composite bimetal pipe welding neck collar weld seam.
Wherein, the fusing point of high temperature resistant not crucible zone 2 higher than the fusing point more than 300 DEG C of carbon steel base tube and liner material, and 5% of the thickness of high temperature resistant not crucible zone 2≤carbon steel base tube wall thickness, in addition, high temperature resistant not crucible zone 2 covers whole corrosion resistant alloy weld zone, and the fusion zone of isolated carbon steel base tube and bushing pipe.
Embodiment:
Composite bimetal pipe Φ 508mm L245 steel welds with the butt girth welding seam of 316L rustless steel double-metal composite pipe, and its base tube wall thickness is 14.2mm, bushing pipe wall thickness 2.5mm.
The bevel for welding of 60 ± 5 ° is gone out, alignment clearance 2.0-3.0mm at composite bimetal pipe tube end maching to be welded.First argon tungsten-arc welding and TGS-316L stainless steel argon arc welding wire is adopted to carry out backing welding to 316L stainless steel bushing pipe.After having welded, polishing equating is carried out to the surface of backing welding layer.Then as shown in Figure 2, use diameter 40 μm of molybdenum filaments to be wound around a layer thickness≤0.7mm (=14.2mm × 5%) molybdenum ribbon on the surface at bottoming layer, molybdenum ribbon wraps up whole backing welding weld seam.Due to Mo fusing point about 2600 DEG C, and 316L and L245 fusing point is all not more than 1500 DEG C, therefore can not melt at whole welding process Mo layer, has completely cut off the fusion zone of 316L and L245, effectively prevent the problem of different-metal material welding.Be not more than 5% of L245 thickness by the thickness of control Mo layer, the requirement of L2 rank flaw detection can be reached, weldquality can be made to reach design instructions for use.
In sum, the present invention introduces high temperature resistant not crucible zone between the carbon steel base tube and bushing pipe at welding point place, because the fusing point of high temperature resistant not crucible zone is far above carbon steel base tube and bushing pipe, effectively the carbon steel base tube of joint and the fusion zone of bushing pipe are kept apart, avoid the phase counterdiffusion of alloying element between carbon steel base tube and bushing pipe.
Claims (8)
1. composite bimetal pipe girth joint is to a welding method, it is characterized in that, comprises the following steps:
1) to the carbon steel base tube bevelling of composite bimetal pipe to be welded, groove type is double V-groove, and the both sides of double V-groove form two shortcomings (4), and make the rectangular shape in the bottom of double V-groove, its top is trapezoidal shape;
2) bushing pipe is welded, form corrosion resistant alloy welding zone (1);
3) by step 2) after the corrosion resistant alloy welding zone (1) that completes welding polishes flat, the high temperature resistant not crucible zone (2) of its surface wrap one deck;
4) carbon steel base tube has been welded, formed carbon steel welding zone (3), so far completed the welding of composite bimetal pipe welding neck collar weld seam.
2. a kind of composite bimetal pipe girth joint according to claim 1 is to welding method, it is characterized in that: the fusing point of high temperature resistant not crucible zone (2) is higher than the fusing point more than 300 DEG C of carbon steel base tube and liner material.
3. a kind of composite bimetal pipe girth joint according to claim 1 and 2 is to welding method, it is characterized in that: 5% of the thickness≤carbon steel base tube wall thickness of high temperature resistant not crucible zone (2).
4. a kind of composite bimetal pipe girth joint according to claim 1 and 2 is to welding method, it is characterized in that: high temperature resistant not crucible zone (2) covers whole corrosion resistant alloy weld zone, and the fusion zone of isolated carbon steel base tube and bushing pipe.
5. a kind of composite bimetal pipe girth joint according to claim 1 and 2 is to welding method, it is characterized in that: the material of high temperature resistant not crucible zone (2) is molybdenum.
6. a kind of composite bimetal pipe girth joint according to claim 1 and 2 is to welding method, it is characterized in that: the wall thickness of bushing pipe is 0.3-4.0mm.
7. a kind of composite bimetal pipe girth joint according to claim 1 and 2 is to welding method, it is characterized in that: step 2) in, adopt argon tungsten-arc welding to weld bushing pipe with TGS-316L stainless steel argon arc welding wire.
8. a kind of composite bimetal pipe girth joint according to claim 1 and 2 is to welding method, it is characterized in that: step 4) in, adopt the mode of manual electric arc welding to be welded by carbon steel base tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410645571.0A CN104493330B (en) | 2014-11-11 | 2014-11-11 | A kind of composite bimetal pipe girth joint is to welding method |
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| CN201410645571.0A CN104493330B (en) | 2014-11-11 | 2014-11-11 | A kind of composite bimetal pipe girth joint is to welding method |
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| CN104493330A true CN104493330A (en) | 2015-04-08 |
| CN104493330B CN104493330B (en) | 2016-11-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106670670A (en) * | 2016-11-25 | 2017-05-17 | 云南昆钢钢结构股份有限公司 | Stainless steel-carbon steel composite tube annular sealing welding method |
| CN107244049A (en) * | 2017-06-13 | 2017-10-13 | 苏州艾盾合金材料有限公司 | A kind of preventing water leakage machine barrel and its preparation technology for double screw extruder |
| CN110385492A (en) * | 2018-04-23 | 2019-10-29 | 林肯环球股份有限公司 | The laser heated filament of multilayered structure welds |
| 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108890076A (en) * | 2018-07-24 | 2018-11-27 | 中国石油天然气集团有限公司 | A kind of boxing method of corrosion resistant alloy inner liner compound pipe |
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| JPH08103872A (en) * | 1994-10-04 | 1996-04-23 | Nippon Steel Corp | Method for welding wear resistant composite tube |
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| CN102554432A (en) * | 2012-02-03 | 2012-07-11 | 中国石油天然气集团公司 | Butt welding method for bimetal composite pipes |
| CN103331327A (en) * | 2013-05-27 | 2013-10-02 | 中国石油天然气集团公司 | Bimetal composite pipe girth welding method |
| CN103624376A (en) * | 2013-11-29 | 2014-03-12 | 西安向阳航天材料股份有限公司 | Method for butt welding end parts of two double-metal composite pipes respectively with adapter ring on the end part |
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2014
- 2014-11-11 CN CN201410645571.0A patent/CN104493330B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08103872A (en) * | 1994-10-04 | 1996-04-23 | Nippon Steel Corp | Method for welding wear resistant composite tube |
| JP2002018592A (en) * | 2000-07-06 | 2002-01-22 | Nkk Corp | Solid wire for circumferential weld of carbon steel pipe and welding method using the same |
| CN102554432A (en) * | 2012-02-03 | 2012-07-11 | 中国石油天然气集团公司 | Butt welding method for bimetal composite pipes |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106670670A (en) * | 2016-11-25 | 2017-05-17 | 云南昆钢钢结构股份有限公司 | Stainless steel-carbon steel composite tube annular sealing welding method |
| CN107244049A (en) * | 2017-06-13 | 2017-10-13 | 苏州艾盾合金材料有限公司 | A kind of preventing water leakage machine barrel and its preparation technology for double screw extruder |
| CN110385492A (en) * | 2018-04-23 | 2019-10-29 | 林肯环球股份有限公司 | The laser heated filament of multilayered structure welds |
| 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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| CN104493330B (en) | 2016-11-16 |
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