CN104493330B - A kind of composite bimetal pipe girth joint is to welding method - Google Patents
A kind of composite bimetal pipe girth joint is to welding method Download PDFInfo
- Publication number
- CN104493330B CN104493330B CN201410645571.0A CN201410645571A CN104493330B CN 104493330 B CN104493330 B CN 104493330B CN 201410645571 A CN201410645571 A CN 201410645571A CN 104493330 B CN104493330 B CN 104493330B
- Authority
- CN
- China
- Prior art keywords
- welding
- carbon steel
- zone
- base tube
- composite bimetal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003466 welding Methods 0.000 title claims abstract description 100
- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 27
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 41
- 239000010962 carbon steel Substances 0.000 claims abstract description 41
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000005260 corrosion Methods 0.000 claims abstract description 17
- 230000007797 corrosion Effects 0.000 claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 15
- 229910052786 argon Inorganic materials 0.000 claims abstract description 10
- 238000010891 electric arc Methods 0.000 claims abstract description 5
- 230000004927 fusion Effects 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- 238000005275 alloying Methods 0.000 abstract description 4
- 230000007704 transition Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of composite bimetal pipe girth joint to welding method, comprise the following steps: the carbon steel base tube bevelling to composite bimetal pipe to be welded, groove type is double V-groove, forms two shortcomings；Use argon tungsten-arc welding that bushing pipe is welded, form corrosion resistant alloy welding zone；After the corrosion resistant alloy welding zone completing welding is polished flat, at the high temperature resistant not crucible zone of its surface wrap one layer；Carbon steel base tube has been welded by the mode using manual electric arc welding, forms carbon steel welding zone, so far completes the welding of composite bimetal pipe welding neck collar weld seam.The present invention is by introducing high temperature resistant not crucible zone between the carbon steel base tube at composite bimetal pipe welding point and corrosion resistant alloy bushing pipe, owing to 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, reduce the control difficulty of weldquality.
Description
[technical field]
The invention belongs to welding technology field, be specifically related to a kind of composite bimetal pipe girth joint butt welding welding side
Method.
[background technology]
Composite bimetal pipe is a kind of with ordinary carbon steel as base tube, with rustless steel, nickel-base alloy, Hastelloy
It is bushing pipe Deng corrosion resistant alloy, by machinery spinning, Explosion composite, the mode such as drawing is compound, hydraulic pressure is compound
The economical anti-corrosion tubing of one produced.Its base tube gives full play to the excellent mechanical performance of carbon steel pipe with cheap
Advantage, and responsible pressure-bearing and pipeline rigid support；Internal lining pipe then undertakes corrosion-resistant effect, the thickness of internal lining pipe
Spend only 0.3-4.0mm and be effectively saved the cost of tubing.Therefore, composite bimetal pipe is widely used in oil
Gas gathering pipeline, Oil/gas Well sleeve pipe, produced-water reinjection pipeline；Chemical industry heat exchanger tube；Electric power demineralized water,
The fields such as desulfurization pipeline.
Composite bimetal pipe girth joint butt welding is one of technological difficulties of composite bimetal pipe, simultaneously its Welder
Skill is complicated, needs strictly to control each process procedure to obtain high-quality joint.The most double gold
Belong to execution YB/T5092-2005 and the JB/T4747-2002 standard that is welded to connect of multiple tube, general employing three layers
Weldering, first argon arc welding back cover, then weld transition zone, capping, girth joint welding process are filled in last manual electric arc welding
As shown in Figure 1, wherein, a is soldering and sealing, and b is backing welding, and c is transition weldering, and d is for filling weldering, and e is lid
Face is welded.But the welding method of existing composite bimetal pipe needs its welding procedure is carried out strict control
More satisfied welding quality could be obtained.Owing to the chemical composition of base tube and bushing pipe exists significant difference, molten
Owing to the diffusion bushing pipe of element is diluted by base tube thus causes the stability of weld seam austenite to show during change
Writing and reduce, phosphorus content increases, simultaneously because austenite recrystallization district is very big, easy segregation P of intergranular gap in molten bath,
The low melting point eutectic products such as S under the effect of tension to crack.Secondly, unit between this base tube and bushing pipe
Element diffusion and the diluting effect that causes, can cause the decline of composite bimetal pipe weld seam corrosion resistance, and
Region near melt run produces martensitic structure, thus adds the fragility of welding line joint.It addition, in order to
Stoping the phase counterdiffusion of alloying element between base tube with bushing pipe, existing welding method is to carry out after backing welding
Transition is welded, and transition weldering belongs to different-metal material welding, this also increases the difficulty of Weld seam quality control.
[summary of the invention]
Present invention aims to the deficiencies in the prior art, it is provided that a kind of composite bimetal pipe girth joint
To welding method, it is somebody's turn to do by introducing high temperature resistant not crucible zone between the carbon steel base tube at welding point and bushing pipe,
Effectively carbon steel base tube and the bushing pipe of joint are kept apart, it is to avoid because of alloying element between carbon steel base tube and bushing pipe
Phase counterdiffusion and many problems of welded quality of causing, simplify the welding procedure of composite bimetal pipe, it is to avoid
Welding between foreign material, improves welding job efficiency.
For achieving the above object, the present invention adopts the following technical scheme that:
A kind of composite bimetal pipe girth joint, to welding method, comprises the following steps:
1) the carbon steel base tube bevelling to composite bimetal pipe to be welded, groove type is double V-groove,
The both sides of double V-groove form two shortcomings so that the rectangular shape in 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) complete welding corrosion resistant alloy welding zone polish flat after, resistance to its surface wrap one layer
High temperature not crucible zone；
4) carbon steel base tube has been welded, formed carbon steel welding zone, so far complete composite bimetal pipe butt welding boxing
Seam welding.
The present invention is further improved by: the fusing point of high temperature resistant not crucible zone is higher than carbon steel base tube and liner material
Fusing point more than 300 DEG C.
The present invention is further improved by: the 5% of the thickness of high temperature resistant not crucible zone≤carbon steel base tube wall thickness.
The present invention is further improved by: the whole corrosion resistant alloy weld zone of high temperature resistant not crucible zone covering, and every
Carbon steel base tube and the fusion zone of bushing pipe absolutely.
The present invention is further improved by: the material of high temperature resistant not crucible zone is molybdenum.
The present invention is further improved by: the wall thickness of bushing pipe is 0.3-4.0mm.
The present invention is further improved by: step 2) in, use argon tungsten-arc welding stainless with TGS-316L
Bushing pipe is welded by steel argon arc welding wire.
The present invention is further improved by: step 4) in, use the mode of manual electric arc welding by carbon steel base tube
Welding completes.
Compared with prior art, the present invention has a following beneficial effect:
The present invention increases a high temperature resistant not crucible zone, this resistance to height between carbon steel base tube and the bushing pipe of pipe end to be welded
The fusing point of temperature not crucible zone, far above carbon steel base tube and the fusing point of bushing pipe, effectively prevent the welding of carbon steel base tube and lining
During sealing of tube interfere with Elements Diffusion and cause at girth joint under bushing pipe corrosion resistance and mechanical performance
Fall.Additionally, the left and right sides of the high temperature resistant not crucible zone of the present invention can exist the shortcoming of a radial direction, but this lacks
The size owed can be controlled by by the thickness of high temperature resistant not crucible zone, makes the performance of commissure reach design
Requirement.
One 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, save
Soldering and sealing welds two steps with transition, it is to avoid the welding between foreign material, is effectively increased weldquality control
Controlling the water circulation is put down.
The processing of bevel for welding of the present invention is identical with the retaining wall on slope of existing composite bimetal pipe butt welding welding,
Welding equipment and packing material do not had special requirement yet.Therefore, the most permissible under existing appointed condition
Carry out composite bimetal pipe butt welding welding, almost without technological transformation cost.
Although non-fusible district exists two shortcomings, but the physical dimension of shortcoming can be by high temperature resistant not crucible zone
Thickness is effectively controlled, and will not cause the reduction of weldquality.
[accompanying drawing explanation]
Fig. 1 is that composite bimetal pipe girth joint welds 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 that schematic diagram is welded in composite bimetal pipe girth joint butt welding of the present invention；
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]
With embodiment, the present invention is described in further details below in conjunction with the accompanying drawings.
See Fig. 2, one composite bimetal pipe girth joint of the present invention to welding method, its welding process flow
It 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 includes following steps:
1) the carbon steel base tube bevelling to composite bimetal pipe to be welded, groove type is double V-groove,
The both sides of double V-groove form two shortcomings 4 so that the rectangular shape in bottom of double V-groove, its top is ladder
Shape；
2) use argon tungsten-arc welding with TGS-316L rustless steel argon arc welding wire, bushing pipe to be welded, formed resistance to
Erosion alloy welding zone 1；
3) by step 1) complete welding corrosion resistant alloy welding zone 1 polish flat after, its surface wrap one layer
High temperature resistant not crucible zone 2；
4) use the mode of manual electric arc welding to be welded by carbon steel base tube, form carbon steel welding zone 3, the completeest
Become 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 the 5% of the thickness≤carbon steel base tube wall thickness of high temperature resistant not crucible zone 2, additionally, high temperature resistant not crucible zone 2 covers whole
Individual corrosion resistant alloy weld zone, and completely cut off the fusion zone of carbon steel base tube and bushing pipe.
Embodiment:
Composite bimetal pipe Φ 508mm L245 steel and the butt girth welding seam of 316L rustless steel double-metal composite pipe
Welding, its base tube wall thickness is 14.2mm, bushing pipe wall thickness 2.5mm.
The bevel for welding of 60 ± 5 °, alignment clearance 2.0-3.0mm is gone out at composite bimetal pipe tube end maching to be welded.
Initially with argon tungsten-arc welding and TGS-316L rustless steel argon arc welding wire, 316L rustless steel bushing pipe is carried out bottoming
Weldering.After having welded, the surface of backing welding layer is carried out equating of polishing.The most as shown in Figure 2, use
Diameter 40 μm molybdenum filament is wound around a layer thickness≤0.7mm (=14.2mm × 5%) molybdenum ribbon on bottoming layer surface,
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 the most not
More than 1500 DEG C, therefore will not melt at whole welding process Mo layer, completely cut off the molten of 316L and L245
Change district, the problem that effectively prevent different-metal material welding.It is not more than L245 thickness by controlling the thickness of Mo layer
The 5% of degree, i.e. can reach the requirement of L2 rank flaw detection, weldquality can be made to reach design and use requirement.
In sum, between present invention carbon steel base tube at welding point and bushing pipe, introduce high temperature resistant not crucible zone,
Owing to the fusing point of high temperature resistant not crucible zone is far above carbon steel base tube and bushing pipe, effectively by the carbon steel base tube of joint
Keep apart with the fusion zone of bushing pipe, it is to avoid the phase counterdiffusion of alloying element between carbon steel base tube and bushing pipe.
Claims (8)
1. a composite bimetal pipe girth joint is to welding method, it is characterised in that comprise the following steps:
1) the carbon steel base tube bevelling to composite bimetal pipe to be welded, groove type is double V-groove,
The both sides of double V-groove form two shortcomings (4) so that the rectangular shape in bottom of double V-groove, its top in
Trapezoidal shape；
2) bushing pipe is welded, form corrosion resistant alloy welding zone (1)；
3) by step 2) complete welding corrosion resistant alloy welding zone (1) polish flat after, at its surface wrap one
The high temperature resistant not crucible zone (2) of layer；
4) carbon steel base tube has been welded, formed carbon steel welding zone (3), so far complete composite bimetal pipe butt welding
Girth joint welds.
A kind of composite bimetal pipe girth joint the most according to claim 1 to welding method, its feature
It is: the fusing point of high temperature resistant not crucible zone (2) is at least above the fusing point 300 DEG C of carbon steel base tube and liner material.
A kind of composite bimetal pipe girth joint the most according to claim 1 and 2 to welding method, its
It is characterised by: the 5% of the thickness of high temperature resistant not crucible zone (2)≤carbon steel base tube wall thickness.
A kind of composite bimetal pipe girth joint the most according to claim 1 and 2 to welding method, its
Be characterised by: high temperature resistant not crucible zone (2) covers whole corrosion resistant alloy welding zone (1), and completely cut off carbon steel base tube with
The fusion zone of bushing pipe.
A kind of composite bimetal pipe girth joint the most according to claim 1 and 2 to welding method, its
It is characterised by: the material of high temperature resistant not crucible zone (2) is molybdenum.
A kind of composite bimetal pipe girth joint the most according to claim 1 and 2 to welding method, its
It is characterised by: the wall thickness of bushing pipe is 0.3-4.0mm.
A kind of composite bimetal pipe girth joint the most according to claim 1 and 2 to welding method, its
It is characterised by: step 2) in, use argon tungsten-arc welding with TGS-316L rustless steel argon arc welding wire, bushing pipe to be entered
Row welding.
A kind of composite bimetal pipe girth joint the most according to claim 1 and 2 to welding method, its
It is characterised by: step 4) in, use 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 |
|---|---|---|---|
| CN201410645571.0A CN104493330B (en) | 2014-11-11 | 2014-11-11 | A kind of composite bimetal pipe girth joint is to welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410645571.0A CN104493330B (en) | 2014-11-11 | 2014-11-11 | A kind of composite bimetal pipe girth joint is to welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104493330A CN104493330A (en) | 2015-04-08 |
| CN104493330B true CN104493330B (en) | 2016-11-16 |
Family
ID=52934830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410645571.0A Active CN104493330B (en) | 2014-11-11 | 2014-11-11 | A kind of composite bimetal pipe girth joint is to welding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104493330B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Families Citing this family (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 | Welding method for annular back cover of stainless steel-carbon steel composite pipe |
| 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 |
| US11110546B2 (en) * | 2018-04-23 | 2021-09-07 | Lincoln Global, Inc. | Laser hot wire welding of multi-layered structures |
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08103872A (en) * | 1994-10-04 | 1996-04-23 | Nippon Steel Corp | Welding method for wear resistant composite pipe |
| 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 |
| CN102554432B (en) * | 2012-02-03 | 2014-07-23 | 中国石油天然气集团公司 | Butt welding method for bimetal composite pipes |
| CN103331327B (en) * | 2013-05-27 | 2016-05-11 | 中国石油天然气集团公司 | A kind of composite bimetal pipe welding method of girth weld |
| CN103624376B (en) * | 2013-11-29 | 2015-07-08 | 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 |
-
2014
- 2014-11-11 CN CN201410645571.0A patent/CN104493330B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104493330A (en) | 2015-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104493330B (en) | A kind of composite bimetal pipe girth joint is to welding method | |
| CN103008988B (en) | The method of internal joint patch weldering exempted from by a kind of anticorrosive steel pipeline | |
| CN104801826B (en) | The process of composite bimetal pipe two-sided welding | |
| CN104197104B (en) | A kind of composite bimetal pipe and manufacturing process thereof | |
| KR100966202B1 (en) | How to Make a Welded Connection and How to Recover a Welded Connection | |
| CN103978292B (en) | Bimetal metallurgy multiple tube that four roads have welded and process thereof | |
| CN103878484A (en) | Efficient butt-joint laser welding method for laminated duplex-metal composite material | |
| CN107695509A (en) | Titanium steel composite pipe welding method based on agitating friction weldering/melting welding Combined Welding | |
| CN103624376A (en) | Method for butt welding end parts of two double-metal composite pipes respectively with adapter ring on the end part | |
| CN108581138A (en) | The vertical upward automatic argon arc weld of composite bimetal pipe connects technique | |
| CN106695079A (en) | Welding method of double-metal composite pipe | |
| CN102233474A (en) | Argon arc welding process for narrow gap hot wire | |
| CN108080773A (en) | All-position ultra-narrow gap high-frequency hot wire TIG welding method for composite pipe | |
| CN102615392A (en) | Welding groove process of mechanical bimetallic composite marine pipe | |
| CN108637518A (en) | Welding groove and welding method of oil and gas composite transportation pipeline | |
| CN112276293A (en) | Tubular pile circumferential weld welding method | |
| CN108500429A (en) | A kind of welding method of composite bimetal pipe | |
| CN102513712A (en) | Manufacturing method for tantalum composite board equipment | |
| CN206662501U (en) | A kind of device for being used to eliminate hot-spot effect during pipeline welding | |
| CN107030359B (en) | Bimetal mechanical composite pipe welding process | |
| CN115026390B (en) | Bimetal composite pipe welding method | |
| CN105057854A (en) | Stainless steel casting surface overlaying method for controlling fusion depth | |
| CN201950378U (en) | Melting ring for butt welding of dissimilar steel heat exchange tube | |
| CN106964909B (en) | The manufacturing method of steel pipe is covered in pre- repaired mouth cermet | |
| CN109483009B (en) | Manufacturing method of end processing structure of bimetal composite pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |