CN106425045A - Welding method of big-wall-thickness and small-pipe-diameter pipe fittings - Google Patents
Welding method of big-wall-thickness and small-pipe-diameter pipe fittings Download PDFInfo
- Publication number
- CN106425045A CN106425045A CN201610960377.0A CN201610960377A CN106425045A CN 106425045 A CN106425045 A CN 106425045A CN 201610960377 A CN201610960377 A CN 201610960377A CN 106425045 A CN106425045 A CN 106425045A
- Authority
- CN
- China
- Prior art keywords
- groove
- pipe
- weld
- pipe fitting
- welding
- 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.)
- Pending
Links
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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The embodiment of the invention provides a welding method of a big-wall-thickness and small-pipe-diameter pipe fittings. The welding method comprises the following steps: cutting off a groove of a pipe fitting; butting a welded pipe fitting with a body pipe fitting; filling argon for protecting the backside of the groove; welding the groove, and polishing and cleaning a welding seam, wherein the step of cutting off the groove of the pipe fitting refers to cutting off a single-sided V-shaped groove 30 or an X-shaped groove 40 or a multi-angle V-shaped groove 50 from the side wall of the welded pipe fitting 10 according to different wall thicknesses of the welded pipe fitting 10, and also cutting off a single-sided V-shaped groove 30 or an X-shaped groove 40 or a multi-angle V-shaped groove 50 from the side wall of the body pipe fitting 20. According to the welding method provided by the invention, different grooves are opened by aiming at the big-wall-thickness and small-pipe-diameter pipe fittings, and differing from a welding method for single-side welding and double-side forming, the grooves are circumferential grooves opened around the outer walls of the pipe fittings; and butting gaps are reserved in the bottom walls of the grooves to ensure that a bottoming layer can be thoroughly welded to avoid a non-fusion defect.
Description
Technical field
The present invention relates to pipe fitting welding technical field, more particularly, to a kind of big wall thickness, the welding method of pipe with small pipe diameter pipe fitting.
Background technology
Martensite heat-resistant steel, due to its good heat resistance, is widely used in generating equipment needing to bear High Temperature High Pressure
Parts.The martensite heat-resistant steel of forged molding, its mechanical performance is good compared with the martensite heat-resistant steel of casting, is generally used for
Manufacture the weldment such as pipe fitting and insulation lug.Martensite heat-resistant steel linear expansion coefficient is less, and after welding pool solidification, volumetric expansion is bright
Aobvious, weld stress is big, and easy to crack, especially when tube wall thickness is larger, and when internal diameter is less, welding difficulty is very big.
The method that existing welding method is confined to single welding, double-faced forming.Larger for this wall thickness, and internal diameter is less
Pipe fitting, its technological difficulties major embodiment is both ways.First, conventional single face welding and double face shaping, operation easier is big, and operator is welded
The requirement of catcher method is higher, and groove sealing run has obvious crator, and pipe weld joint on inner side polishing amount is larger.Secondly, prime coat holds
It is also easy to produce slag inclusion and do not merge defect, due to being martensite steel, the presence of defect, it is easily caused weld cracking.And, this side
Difficult, less especially for the internal diameter and longer pipe fitting of processing polishing after method welding, after welding, crator grinding process inside pipe
Very difficult, difficulty of processing is very big, and general lathe cannot be processed.
Content of the invention
It is necessary for big wall thickness, a kind of groove soldering amount of pipe with small pipe diameter pipe fitting proposition is little, simplify sanding operation difficulty, weldering
The superior in quality big wall thickness of the type that is seamed into, the welding method of pipe with small pipe diameter pipe fitting.
A kind of big wall thickness, the welding method of pipe with small pipe diameter pipe fitting, comprise the following steps：
Excision pipe bevel：Different according to the wall thickness of weld-end fittings, from side wall excision one side double V-groove or the X-type of weld-end fittings
Groove or multi-angle double V-groove, also excise one side double V-groove or X-type groove or multi-angle V-type slope from the side wall of body pipe fitting
Mouthful；
Weld-end fittings is docked with body pipe fitting：Weldment pipe fitting is docked with body pipe fitting, keeps internal diameter and the body of weldment pipe fitting
The internal diameter of pipe fitting is consistent, retains the butt-joint clearance of 2～3mm, weld-end fittings dock with body pipe fitting after no step；
Groove back side argon-filled protection：After pipe fitting docking, for leading to argon in pipe, and by the body pipe fitting of groove both sides and weld-end fittings
Carrying out plug with heat-preservation cotton stifled, tunger tube is passed through heat-preservation cotton, extending to it is ensured that forming normal pressure argon stream in pipe at groove, or
Can be clearly felt that in pipe, argon stream outwards overflows along groove gap；
Groove welding：First adopt bottom argon arc welding two-layer, then filled using the welding rod of a diameter of Φ 3.2mm, filling thickness >=
20mm, is finally filled using the welding rod of a diameter of Φ 4.0mm～5.0mm, until will be full for groove welding so that soldering area and welded pipe
The outer wall of part is concordant；
Weld grinding is cleared up.
It is directed to big wall thickness, pipe with small pipe diameter pipe fitting opens up different grooves, is different from the weldering of single welding, double-faced forming in the present invention
Connect method, this groove is the groove of circumferencial direction that opens up of outer wall around pipe fitting, also reserves butt-joint clearance in groove diapire, protects
Card prime coat can penetrate, it is to avoid produce and do not merge defect.
Brief description
Fig. 1 is the groove excision schematic diagram of the first embodiment.
Fig. 2 is that the groove of second embodiment excises schematic diagram.
Fig. 3 is the groove excision schematic diagram of the third embodiment.
Fig. 4 is to express multistage groove and the partial enlarged drawing of edge boss in Fig. 3.
Fig. 5 is the schematic diagram of expression heat-preservation cotton filling.
In figure：Weld-end fittings 10, body pipe fitting 20, one side double V-groove 30, X-type groove 40, multi-angle double V-groove 50, many
Level groove 51, edge boss 52, butt-joint clearance 60, heat-preservation cotton 70, tunger tube 80.
Specific embodiment
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be attached to use required in embodiment
Figure be briefly described it should be apparent that, drawings in the following description are some embodiments of the present invention, common for this area
For technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Referring to Fig. 1 to Fig. 5, embodiments provide a kind of big wall thickness, the welding method of pipe with small pipe diameter pipe fitting, including with
Lower step：
Excision pipe bevel：Different according to the wall thickness of weld-end fittings 10, from the side wall excision one side double V-groove 30 of weld-end fittings 10
Or X-type groove 40 or multi-angle double V-groove 50, also excise one side double V-groove 30 or X-type groove 40 from the side wall of body pipe fitting 20
Or multi-angle double V-groove 50；
Weld-end fittings is docked with body pipe fitting：Weldment pipe fitting is docked with body pipe fitting 20, keeps internal diameter and the basis of weldment pipe fitting
The internal diameter of body pipe fitting 20 is consistent, retains the butt-joint clearance 60 of 2～3mm, weld-end fittings 10 dock with body pipe fitting 20 after no step；
Retention gap is for prime coat through welding, it is to avoid produces and does not merge defect;
Groove back side argon-filled protection：After pipe fitting docking, for leading to argon in pipe, and by the body pipe fitting 20 of groove both sides and welded pipe
Part 10 heat-preservation cotton 70 carries out plug and blocks up, and tunger tube 80 is passed through heat-preservation cotton 70, extends at groove it is ensured that forming normal pressure in pipe
Argon stream, or can be clearly felt that in pipe, argon stream outwards overflows along groove gap；In figure arrow is argon stream direction,
General shielding gas selects noble gases, and argon is more common.This mode, can effectively improve single welding, double-faced forming quality, especially
It is pipe weld joint on inner side Forming Quality.The polishing amount of pipe weld joint on inner side can effectively be reduced, reduce the generation of root of weld defect;
Groove welding：First adopt bottom argon arc welding two-layer, then filled using the welding rod of a diameter of Φ 3.2mm, filling thickness >=
20mm, is finally filled using the welding rod of a diameter of Φ 4.0mm～5.0mm, until will be full for groove welding so that soldering area and welded pipe
The outer wall of part 10 is concordant；
Weld grinding is cleared up.Due to implementing the welding method of logical argon in pipe, pipe weld joint on inner side molding very well, only need to somewhat be beaten
Mill can meet detection and require, and greatly reduce weld cleaning difficulty.
Further, in excision pipe bevel step, concrete operations are：As weld-end fittings 10 wall thickness≤60mm, from weldering
The side wall excision one side double V-groove 30 of jointed tubular workpieces 10, bevel angle is at 45 °～60 °；As weld-end fittings 10 wall thickness ＞ 60mm,
From the side wall excision X-type groove 40 of weld-end fittings 10, bevel angle is respectively 55 °～65 ° and 30 °；When weld-end fittings 10 wall thickness
More than 200mm, and weld-end fittings 10 internal diameter is not more than 200mm, when leading to not carry out soldering seam grinding inside weld-end fittings 10,
Side wall excision multi-angle double V-groove 50 from weld-end fittings 10.So both can guarantee that welding quality, soldering amount can have been reduced again.Slope
During mouth design, body groove needs to mate with pipe bevel.
Further, described multi-angle double V-groove 50 include some multistage from the excision of the outer wall inward wall of weld-end fittings 10
Groove 51, the slope of described adjacent multistage groove 51 is gradually reduced from the inwall outer wall of weld-end fittings 10.For this wall thickness
The less pipe fitting of larger, internal diameter, if also excise as one side double V-groove 30 so that near weld-end fittings 10 inwall groove
A/F very little, welding operation is inconvenient, soldering area very big near the A/F of the groove of outer wall of weld-end fittings 10
Domain is very big, and in order to avoid this defect, so adopt multi-angle double V-groove 50 herein, multi-angle double V-groove 50 can ensure simultaneously
Wider near the A/F of the groove of inwall of weld-end fittings 10, near the A/F of the groove of outer wall of weld-end fittings 10
Less.
Further, described multi-angle double V-groove 50 reserves edge boss 52 near the groove of inwall, also in body pipe fitting 20
Also reserve edge boss 52 near the groove of inwall, the thickness of described edge boss 52 is 2～3mm, because edge boss 52 mistake
Thickness is not easy to penetrate, and the width of described edge boss 52 is 3～5mm, the edge boss 52 of described weld-end fittings 10 and body tube
Described butt-joint clearance 60 is set between the edge boss 52 of part 20.The setting of this edge boss 52, is reserved during prime coat welding
Swing space, because in bottoming layer operation, in order that welding rod is all fully contacted with body pipe fitting 20 and weld-end fittings 10, behaviour
Author slightly swings about welding rod, so that welding rod is contacted with the pipe fitting of both sides, if not reserving edge boss 52 so that two
The inwall of pipe fitting is very sharp, the width very little between groove, and during operation, welding rod can not freely swing, and leads to welding effect bad.
Further, in the argon-filled protection step of the described groove back side：First argon is passed through from body pipe fitting 20, treats body
After the air of pipe fitting 20 and weld-end fittings 10 inwall is excluded totally, then the body pipe fitting 20 heat-preservation cotton 70 being filled in groove both sides
In weld-end fittings 10, thus ensureing in body pipe fitting 20 and weld-end fittings 10 no air, it is to avoid the oxidation in welding process.
Further, use for saving argon, only by the groove position leakage of first welding, the groove position insulation of rear welding
Cotton 70 plug is stifled.
Further, in described groove welding step：After the completion of prime coat welding, often weld one layer, this layer is welded
Layer is polished, and is polishing to whole weld seam and presents metallic luster, then welds next layer.So can ensure that and connect between weld layer
Connect closely knit, soldering area organizational structure is closely knit, good mechanical performance.
During welding operation, the circumference groove after docking is horizontal, operator's hand torch, circumferentially side
To taking horizontal position welding mode, weld layer by layer around groove.
Step in present invention method can carry out order according to actual needs and adjust, merges and delete.
Module in embodiment of the present invention device or unit can merge according to actual needs, divide and delete.
Above disclosed be only present pre-ferred embodiments, certainly the right model of the present invention can not be limited with this
Enclose, one of ordinary skill in the art will appreciate that realizing all or part of flow process of above-described embodiment, and will according to right of the present invention
Seek made equivalent variations, still fall within the scope that invention is covered.
Claims (7)
1. the welding method of a kind of big wall thickness, pipe with small pipe diameter pipe fitting is it is characterised in that comprise the following steps：
Excision pipe bevel：Different according to the wall thickness of weld-end fittings, from side wall excision one side double V-groove or the X-type of weld-end fittings
Groove or multi-angle double V-groove, also excise one side double V-groove or X-type groove or multi-angle V-type slope from the side wall of body pipe fitting
Mouthful；
Weld-end fittings is docked with body pipe fitting：Weldment pipe fitting is docked with body pipe fitting, keeps internal diameter and the body of weldment pipe fitting
The internal diameter of pipe fitting is consistent, retains the butt-joint clearance of 2～3mm, weld-end fittings dock with body pipe fitting after no step；
Groove back side argon-filled protection：After pipe fitting docking, for leading to argon in pipe, and by the body pipe fitting of groove both sides and weld-end fittings
Carrying out plug with heat-preservation cotton stifled, tunger tube is passed through heat-preservation cotton, extending to it is ensured that forming normal pressure argon stream in pipe at groove, or
Can be clearly felt that in pipe, argon stream outwards overflows along groove gap；
Groove welding：First adopt bottom argon arc welding two-layer, then filled using the welding rod of a diameter of Φ 3.2mm, filling thickness >=
20mm, is finally filled using the welding rod of a diameter of Φ 4.0mm～5.0mm, until will be full for groove welding so that soldering area and welded pipe
The outer wall of part is concordant；
Weld grinding is cleared up.
2. as claimed in claim 1 big wall thickness, pipe with small pipe diameter pipe fitting welding method it is characterised in that：In excision pipe bevel
In step, concrete operations are：As weld-end fittings wall thickness≤60mm, from the side wall excision one side double V-groove of weld-end fittings, groove
Angle is at 45 °～60 °；As weld-end fittings wall thickness ＞ 60mm, from the side wall excision X-type groove of weld-end fittings, bevel angle is divided
Wei 55 °～65 ° and 30 °；When weld-end fittings wall thickness is more than 200mm, and weld-end fittings internal diameter is not more than 200mm, leads to not
When carrying out soldering seam grinding inside weld-end fittings, from the side wall excision multi-angle double V-groove of weld-end fittings.
3. as claimed in claim 2 big wall thickness, pipe with small pipe diameter pipe fitting welding method it is characterised in that：Described multi-angle V-type slope
Mouth includes some multistage groove of the outer wall inward wall excision from weld-end fittings, and the slope of described adjacent multistage groove is from welded pipe
The inwall outer wall of part is gradually reduced.
4. as claimed in claim 3 big wall thickness, pipe with small pipe diameter pipe fitting welding method it is characterised in that：Described multi-angle V-type slope
Mouth reserves edge boss near the groove of inwall, still reserves edge boss, described side in body pipe fitting near the groove of inwall
Thickness along boss is 2～3mm, and the width of described edge boss is 3～5mm, the edge boss of described weld-end fittings and body
Between the edge boss of pipe fitting, described butt-joint clearance is set.
5. as claimed in claim 3 big wall thickness, pipe with small pipe diameter pipe fitting welding method it is characterised in that：At the described groove back side
In argon-filled protection step：First argon is passed through from body pipe fitting, treats that body pipe fitting and the air of weld-end fittings inwall are excluded
After clean, then heat-preservation cotton is filled in the body pipe fitting and weld-end fittings of groove both sides, thus ensureing body pipe fitting and welded pipe
No air in part, it is to avoid the oxidation in welding process.
6. as claimed in claim 5 big wall thickness, pipe with small pipe diameter pipe fitting welding method it is characterised in that：Use for saving argon,
Only by the groove position leakage of first welding, the groove position of rear welding is blocked up with insulation tampon.
7. as claimed in claim 5 big wall thickness, pipe with small pipe diameter pipe fitting welding method it is characterised in that：In described groove welding
In step：After the completion of prime coat welding, often weld one layer, this layer of weld layer is polished, is polishing to whole weld seam and presents
Go out metallic luster, then weld next layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610960377.0A CN106425045A (en) | 2016-10-28 | 2016-10-28 | Welding method of big-wall-thickness and small-pipe-diameter pipe fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610960377.0A CN106425045A (en) | 2016-10-28 | 2016-10-28 | Welding method of big-wall-thickness and small-pipe-diameter pipe fittings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106425045A true CN106425045A (en) | 2017-02-22 |
Family
ID=58180471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610960377.0A Pending CN106425045A (en) | 2016-10-28 | 2016-10-28 | Welding method of big-wall-thickness and small-pipe-diameter pipe fittings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106425045A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109429490A (en) * | 2017-06-23 | 2019-03-05 | 克里凯文斯管线国际有限公司 | The system and method for pipeline section for welded pipe line |
| CN111299883A (en) * | 2019-11-12 | 2020-06-19 | 中国化学工程第六建设有限公司 | Welding method of TP347 high-pressure thick-wall stainless steel pipeline |
| US11175099B2 (en) | 2013-05-23 | 2021-11-16 | Crc-Evans Pipeline International, Inc. | Systems and methods for use in welding pipe segments of a pipeline |
| CN114952069A (en) * | 2022-05-30 | 2022-08-30 | 攀钢集团西昌钢钒有限公司 | Pipeline welding joint structure and welding method |
| US11458571B2 (en) | 2016-07-01 | 2022-10-04 | Crc-Evans Pipeline International, Inc. | Systems and methods for use in welding pipe segments of a pipeline |
| US11767934B2 (en) | 2013-05-23 | 2023-09-26 | Crc-Evans Pipeline International, Inc. | Internally welded pipes |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586699A (en) * | 2009-06-30 | 2009-11-25 | 四川科新机电股份有限公司 | Stainless steel tube with welding bevel model, welding method and argon shield apparatus |
| CN101618475A (en) * | 2008-07-03 | 2010-01-06 | 中冶成工建设有限公司 | Carbon dioxide automatic full position welding method for small bore pipes |
| CN101913016A (en) * | 2010-08-04 | 2010-12-15 | 江苏申港锅炉有限公司 | Pipe butt joint internal argon-filling method |
| CN102248267A (en) * | 2011-07-25 | 2011-11-23 | 中国石化集团第四建设公司 | Thick-wall chromium-molybdenum steel pipeline submerged arc welding technology |
| CN102513657A (en) * | 2011-11-30 | 2012-06-27 | 广新海事重工股份有限公司 | Argon arc welding method for pipe welding and auxiliary device used in method |
| CN102601490A (en) * | 2011-12-20 | 2012-07-25 | 宁夏电力公司电力科学研究院 | Welding process of P92/T92 steel pipe and heating device |
-
2016
- 2016-10-28 CN CN201610960377.0A patent/CN106425045A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101618475A (en) * | 2008-07-03 | 2010-01-06 | 中冶成工建设有限公司 | Carbon dioxide automatic full position welding method for small bore pipes |
| CN101586699A (en) * | 2009-06-30 | 2009-11-25 | 四川科新机电股份有限公司 | Stainless steel tube with welding bevel model, welding method and argon shield apparatus |
| CN101913016A (en) * | 2010-08-04 | 2010-12-15 | 江苏申港锅炉有限公司 | Pipe butt joint internal argon-filling method |
| CN102248267A (en) * | 2011-07-25 | 2011-11-23 | 中国石化集团第四建设公司 | Thick-wall chromium-molybdenum steel pipeline submerged arc welding technology |
| CN102513657A (en) * | 2011-11-30 | 2012-06-27 | 广新海事重工股份有限公司 | Argon arc welding method for pipe welding and auxiliary device used in method |
| CN102601490A (en) * | 2011-12-20 | 2012-07-25 | 宁夏电力公司电力科学研究院 | Welding process of P92/T92 steel pipe and heating device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11175099B2 (en) | 2013-05-23 | 2021-11-16 | Crc-Evans Pipeline International, Inc. | Systems and methods for use in welding pipe segments of a pipeline |
| US11767934B2 (en) | 2013-05-23 | 2023-09-26 | Crc-Evans Pipeline International, Inc. | Internally welded pipes |
| US11458571B2 (en) | 2016-07-01 | 2022-10-04 | Crc-Evans Pipeline International, Inc. | Systems and methods for use in welding pipe segments of a pipeline |
| CN109429490A (en) * | 2017-06-23 | 2019-03-05 | 克里凯文斯管线国际有限公司 | The system and method for pipeline section for welded pipe line |
| CN111299883A (en) * | 2019-11-12 | 2020-06-19 | 中国化学工程第六建设有限公司 | Welding method of TP347 high-pressure thick-wall stainless steel pipeline |
| CN111299883B (en) * | 2019-11-12 | 2021-11-16 | 中国化学工程第六建设有限公司 | Welding method of TP347 high-pressure thick-wall stainless steel pipeline |
| CN114952069A (en) * | 2022-05-30 | 2022-08-30 | 攀钢集团西昌钢钒有限公司 | Pipeline welding joint structure and welding method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106425045A (en) | Welding method of big-wall-thickness and small-pipe-diameter pipe fittings | |
| CN102528237B (en) | Welding process for carbon steel process pipeline | |
| CN102773581B (en) | The welding procedure of pearlite heatproof steel and ordinary carbon steel | |
| CN103586566B (en) | The semi-automatic argon arc welding method of composite bimetal pipe | |
| CN106862730A (en) | A kind of vertical butt welding method of slab | |
| CN101628355B (en) | Sealing method for tube end of carbon steel/stainless steel composited tube | |
| CN102423826B (en) | Welding process of large connecting tube of vacuum vessel | |
| CN101586699A (en) | Stainless steel tube with welding bevel model, welding method and argon shield apparatus | |
| CN103358036B (en) | A kind of production stainless steel composite pipe welding procedure | |
| CN103264209A (en) | Combine-welding method of stainless steel welded parts | |
| CN103551750B (en) | Welded tube and manufacture method thereof | |
| CN102848057B (en) | A kind of repair method of Al and Alalloy weld seam | |
| CN105127566A (en) | Full penetration welding method of large-thickness carbon steel and stainless steel clad plate | |
| CN106695079A (en) | Welding method of double-metal composite pipe | |
| CN102390002B (en) | Automatic submerged-arc welding method for large insertion-type adapting pipe on cone | |
| CN104607827B (en) | A kind of cast steel that prevents welds the method cracked with steel | |
| CN108856989A (en) | Consumable electrode MIG is welded in the method for priming in pipeline welding | |
| CN208644343U (en) | A kind of gas-protection-free metal tube docking welding structure | |
| CN1238148C (en) | Process for welding pipeline by automatic external welding machine | |
| CN104942524A (en) | Contact element repairing method | |
| CN105364272A (en) | Carbon steel tube welding process | |
| CN106670671A (en) | Welding method for martensite heat-resistant steel boss weldment | |
| CN108746934A (en) | A kind of natural gas transmission method for welding pipeline | |
| CN102513657A (en) | Argon arc welding method for pipe welding and auxiliary device used in method | |
| CN102922099A (en) | Welding method of variable manifold for locomotive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170222 |
|
| RJ01 | Rejection of invention patent application after publication |