CN107443016A - A kind of ultra-thin interior combined helical pipe tubulation welding method - Google Patents
A kind of ultra-thin interior combined helical pipe tubulation welding method Download PDFInfo
- Publication number
- CN107443016A CN107443016A CN201710648641.1A CN201710648641A CN107443016A CN 107443016 A CN107443016 A CN 107443016A CN 201710648641 A CN201710648641 A CN 201710648641A CN 107443016 A CN107443016 A CN 107443016A
- Authority
- CN
- China
- Prior art keywords
- welding
- stainless steel
- inwall
- ultra
- tubulation
- 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
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
-
- 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)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention discloses a kind of ultra-thin interior combined helical pipe tubulation welding method, stainless steel layer inwall welding is carried out using stainless steel welding stick and solder flux, inwall weld locations are determined during welding, to meet the distance between center and inwall pad away from the nearest pressure roller roll shaft of inwall pad≤300mm；Carbon steel layer outer wall welding is carried out using the carbon steel solder flux and welding wire of routine.The present invention is without milling side, adjust the distance between center and stainless steel cladding inwall pad of nearest pressure roller roll shaft and ensure welding quality, adjustment inside and outside wall welding parameter matching ensure inside and outside welding line area of dissolving each other be located at base layer region, to improve the decay resistance of inwall weld seam.Spiral tube structure intensity produced by the present invention is high, and weld corrosion resistance is strong.
Description
Technical field
The present invention relates to combined helical pipe tubulation welding method in a kind of Thin Specs stainless steel composite material, belong to stainless steel
Composite tubulation welding technology field.
Background technology
Combined helical pipe is the new varieties that can be applied to a field of fluid steel pipe in stainless steel composite material.Tubulation
Raw material stainless steel composite material coiled sheet is typically used using ordinary carbon steel as base material, stainless steel as plied timber
Rolling mill practice realizes the metallurgical Novel environment-friendlymaterial material being complex as a whole.Base material（Carbon steel）It act as providing enough structures strong
Degree；Plied timber（Stainless steel）It act as providing corrosion resistance and preferably dicoration.Composite screw in stainless steel composite material
The plied timber of pipe（Stainless steel layer）For the inner surface of welded pipe, it is contacted with fluid in fluid delivery process, can effectively be kept away
Exempt from the secondary pollution of trandfer fluid while play certain corrosion resistance effect.The kind pipeline is mainly used in drinking water, stone
The conveying of the fluids such as oil, natural gas is used.Combined helical pipe tubulation and its welding procedure had been done a large amount of in present domestic stainless steel
Research, existing stainless steel composite material helix tube tube-making process technology are：Stock inspection → unreel → leveling → shearing → butt welding
→ cutting edge → milling side → pre-bending → shaping → interior outside weld → Pipe Cutting → outward appearance detection → flat head chamfering.As patent application publication number is
CN103028631A and CN102962563A Chinese patent describes tubulation and welding procedure, but Patents tubulation welding speed
Degree is slow（1.8~1.9m/min）, caliber be 400 ~ 500mm, base material add plied timber total wall thickness requirement be 4.3mm ~ 7mm.
Edge milling machines must be used to carry out milling side and milling groove to tubulation raw material in tubulation production process simultaneously, ensure that welding groove quality is come
Ensure welding quality.Because stainless steel composite material is double metallic composite material, plied timber has with base material metallic character
There is the problems such as different and cladding ratio, cause milling side and milling groove quality to be difficult to control, so as to make tubulation welding unstable
And then cause that composite steel tube weldquality is uneven, stainless steel side weld poor corrosion resistance（It is unstable）, it is accordingly difficult to protect
Metallic composite pipeline quality is demonstrate,proved, limits the application and development of combined helical pipe in stainless steel.
The content of the invention
In view of the deficiencies of the prior art, the present invention puies forward a kind of ultra-thin interior combined helical pipe tubulation welding method, uses
Composite steel tube need not open up welding groove in the stainless steel composite material of welding method manufacture, in gained stainless steel composite material
Compound steel pipe structure intensity is high, stainless steel side weld excellent anti-corrosion performance.
The present invention is achieved through the following technical solutions：A kind of ultra-thin interior combined helical pipe tubulation welding method, process are following
Technological process：Slitting → unreel → leveling → shearing → butt welding → shaping → interior outside weld → Pipe Cutting → outward appearance detection → tack falls
Rib；Milling side, milling groove and/or pre-bending are omitted after the slitting, and interior outside weld is by following concrete operations：
Stainless steel layer inwall welding is carried out using stainless steel welding stick and solder flux, inwall weld locations are determined during welding, to meet
The distance between center and inwall pad away from the nearest pressure roller roll shaft of inwall pad≤300mm, so can guarantee that inwall
The mother metal plate shape stability of bond pad locations so as to ensureing the stability welded in tubulation welding process, the defects of avoiding misalignment from
And ensure the welding quality of stainless steel pipe material；Carbon steel layer outer wall welding is carried out using the carbon steel solder flux and welding wire of routine.
The distance between the center of the pressure roller roll shaft and inwall pad suitably adjust according to tubulation raw material wall thickness, stainless
Steel composite material gross thickness is thinner, and the center of pressure roller roll shaft and the distance between inwall pad are smaller.
The welding of stainless steel layer inwall and the welding of carbon steel layer outer wall are welded using submerged-arc welding, external welding in adjustment
Parameter matching performance ensure inside and outside welding line area of dissolving each other be located at base layer region, to improve the decay resistance of inside weld and stability,
The technological parameter of interior outside weld is as follows：The solder flux of stainless steel layer inwall welding is using the special submerged arc flux of stainless steel, welding wire choosing
Use nickel（Ni）, chromium（Cr）Constituent content is higher than the welding wire of mother metal cladding stainless steel, a diameter of 2.0 ~ 3.2mm；The electricity of inwall welding
It is 240 ~ 400A to press as 27 ± 3V, welding current；The welding of carbon steel layer outer wall uses conventional carbon steel solder flux and welding wire, and gage of wire exists
3.2~4.0mm；The voltage of outer wall welding is 27 ± 3V, and welding current is 400 ~ 680A；2.0 ~ 3.2m/min of speed of welding.
The slitting is to determine stainless steel composite material tubulation raw material by helix tube caliber and helix tube molding machine group feature
Plate it is wide, wide cut stock roll is prepared after slitting to the raw band volume for being adapted to the production of helix tube tubulation, while check stock roll matter
Amount situation, flash removed etc. is gone to divide strip defect.
The unreel, leveling, shearing, butt welding are routinely technique progress.
The stainless steel composite material raw material coiled sheet gross thickness of the ultra-thin interior combined helical pipe is 3.0 ~ 4.0mm.
The production tube caliber of the ultra-thin interior combined helical pipe is 165 ~ 406mm.
Advantages of the present invention and effect：The present invention is without milling side, milling groove and pre-bending, weldering weld locations directly in adjustment
And adjustment inside and outside wall welding parameter matching, welding line area of dissolving each other is located at base layer region inside and outside guarantee, to improve inside weld
Decay resistance and stability ensure that tubulation welding quality, and optimize combined helical pipe tube-making process in stainless steel, improve
The tubulation speed of production of combined helical pipe in stainless steel, reduce production cost；It ensure that composite screw in stainless steel composite material
The weldquality of pipe pipe, and inwall（Stainless steel cladding side）The decay resistance of weld seam.The stainless steel produced using such scheme
Combined helical pipe in composite, occur by correlation standard hydraulic test, phenomena such as no cracking, booster, weld seam leak, manage
And weld seam bearing capacity is excellent；By national standard GB/T 10125-1997《Artificial atmosphere corrosion test salt spray test》Standard, internally
Wall（Stainless steel cladding side）Weld seam carries out neutral salt spray test test, and weld seam is through the neutral salt spray test of 1500 hours, non-corroding.
Brief description of the drawings
Fig. 1 is the compound interior combined helical pipe inner and outer welding sectional view of stainless steel；
Fig. 2 is that welding position puts partial schematic diagram in combined helical pipe in stainless steel.
In figure：1-basic unit carbon steel；2-cladding stainless steel；3-inwall weld seam（Cladding stainless steel side weld）；4-weld seam
Dissolve each other area；5-outer wall weld seam（Basic unit's carbon steel side weld）；6-belt delivering roller beam；7-the pressure roller nearest away from inwall pad；8—
Inwall pad；9-support roller；The distance between the center of S-pressure roller roll shaft and inwall pad.
Embodiment
With reference to embodiment, the present invention will be further described.
Embodiment 1
Stainless steel composite material coiled sheet gross thickness 3.0mm, after point good bar without milling groove cold roll forming be in caliber 165mm it is compound
Spiral welded pipe tubulose, adjust interior weldering weld locations：The center of nearest pressure roller roll shaft and stainless steel cladding inwall pad it
Between distance be 200mm.Welding technique of submerged arc welding：Solder flux is using the special submerged arc flux of stainless steel, and interior welding wire is from straight
Footpath is 2.0mm 308L stainless steel welding sticks；Interior weldering 27 ± 3V of weldingvoltage, welding current 240A；The conventional solder flux of outside weld use,
Welding wire, gage of wire is in 4.0mm, outside weld 27 ± 3V of weldingvoltage, welding current 600A.Speed of welding 3.2m/min.
The caliber of the technique productions is combined helical pipe in 165mm stainless steel, through 30 kilograms of hydraulic tests, no cracking,
Phenomena such as booster, weld seam leak, occurs, and pipe and weld seam bearing capacity are excellent；Weld seam pull test is broken in mother metal, the tension of weld seam
Intensity is more than mother metal；By national standard GB/T 10125-1997《Artificial atmosphere corrosion test salt spray test》Standard is to internal layer（It is stainless
Steel side）Weld seam carries out neutral salt spray test test, and weld seam is through the neutral salt spray test of 1500 hours, non-corroding.
Embodiment 2
Stainless steel composite material band rolls up gross thickness 3.0mm, after point good bar without milling groove cold roll forming be in caliber 219mm it is compound
Spiral welded pipe tubulose, it is 150mm to adjust the distance between center and stainless steel cladding inwall pad of nearest pressure roller roll shaft.
Welding technique of submerged arc welding：Solder flux selects a diameter of 2.5mm 308L not using the special submerged arc flux of stainless steel, interior welding wire
Become rusty steel welding wire；Interior weldering 27 ± 3V of weldingvoltage, welding current 280A；Outside weld is existed using conventional solder flux, welding wire, gage of wire
3.2mm, outside weld 27 ± 3V of weldingvoltage, welding current 400A.Speed of welding 2.0m/min.
The caliber of the technique productions is combined helical pipe in 219mm stainless steel composite material, through 30 kilograms of hydraulic tests,
Occur without phenomena such as cracking, booster, weld seam leak, pipe and weld seam bearing capacity are excellent；Weld seam pull test is broken in mother metal, weld seam
Tensile strength is more than mother metal；By national standard GB/T 10125-1997《Artificial atmosphere corrosion test salt spray test》Standard is to internal layer
（Stainless steel side）Weld seam carries out neutral salt spray test test, and weld seam is through the neutral salt spray test of 1500 hours, non-corroding.
Embodiment 3
Stainless steel composite material band rolls up gross thickness 3.5mm, and without milling groove after point good bar, cold roll forming is multiple in caliber 273mm
Spiral welded pipe tubulose is closed, adjusting the distance between the center of nearest pressure roller roll shaft and stainless steel cladding inwall pad is
250mm.Welding technique of submerged arc welding：Solder flux is using the special submerged arc flux of stainless steel, and interior welding wire is from a diameter of 3.2mm's
308L stainless steel welding sticks；Interior weldering 27 ± 3V of weldingvoltage, welding current 300A；Outside weld is straight using conventional solder flux, welding wire, welding wire
Footpath is in 4.0mm, outside weld 27 ± 3V of weldingvoltage, welding current 540A.Speed of welding 2.5m/min.
The caliber of the technique productions is combined helical pipe in 273mm stainless steel, is detected through 30 kilograms of hydraulic pressure, no cracking,
Phenomena such as booster, weld seam leak, occurs, and pipe and weld seam bearing capacity are excellent；Weld properties are examined, and are broken in mother metal, weld seam
Tensile strength is more than mother metal；By national standard GB/T 10125-1997《Artificial atmosphere corrosion test salt spray test》Standard is to inwall
（Stainless steel side）Weld seam carries out neutral salt spray test test, and weld seam is through the neutral salt spray test of 1500 hours, non-corroding.
Embodiment 4
Stainless steel composite material band rolls up gross thickness 4.0mm, without milling groove after point good bar, without milling groove after good bar, clod wash into
Type is composite screw welded tube tubulose in caliber 406mm, and the center and stainless steel cladding inwall for adjusting nearest pressure roller roll shaft are welded
The distance between point is 300mm.Welding technique of submerged arc welding：Solder flux is using the special submerged arc flux of stainless steel, interior welding wire choosing
With a diameter of 3.2mm 308L stainless steel welding sticks；Interior weldering 27 ± 3V of weldingvoltage, welding current 400A；Outside weld is using routine
Solder flux, welding wire, gage of wire is in 4.0mm, outside weld 27 ± 3V of weldingvoltage, welding current 680A.Speed of welding 2.0m/min.
The caliber of the technique productions is combined helical pipe in 406mm stainless steel, is detected through 30 kilograms of hydraulic pressure, no cracking,
Phenomena such as booster, weld seam leak, occurs, and pipe and weld seam bearing capacity are excellent；Weld seam pull test is broken in mother metal, the tension of weld seam
Intensity is more than mother metal；After surface treated, by national standard GB/T 10125-1997《Artificial atmosphere corrosion test salt spray test》For
Standard, to internal layer（Stainless steel side）Weld seam carries out neutral salt spray test test, and weld seam is through the neutral salt spray test of 1500 hours, nothing
Corrosion.
Claims (6)
- A kind of 1. ultra-thin interior combined helical pipe tubulation welding method, it is characterised in that：By following technological process：Slitting → unreel → leveling → shearing → butt welding → shaping → interior outside weld → Pipe Cutting → outward appearance detection → flat head chamfering；The interior outside weld is under Row concrete operations：Stainless steel layer inwall welding is carried out using stainless steel welding stick and solder flux, inwall weld locations are determined during welding, to meet The distance between center and inwall pad away from the nearest pressure roller roll shaft of inwall pad≤300mm；Using the carbon steel of routine Solder flux and welding wire carry out carbon steel layer outer wall welding.
- 2. ultra-thin interior combined helical pipe tubulation welding method according to claim 1, it is characterised in that：The pressure roller roll shaft The distance between center and inwall pad suitably adjusted according to tubulation raw material wall thickness, stainless steel composite material gross thickness is got over Thin, the center of pressure roller roll shaft and the distance between inwall pad are smaller.
- 3. ultra-thin interior combined helical pipe tubulation welding method according to claim 1, it is characterised in that：The stainless steel layer Inwall is welded and the welding of carbon steel layer outer wall is welded using submerged-arc welding, and the technological parameter of interior outside weld is as follows：In stainless steel layer The solder flux of wall welding is using the special submerged arc flux of stainless steel, and welding wire is from nickel, chromium content higher than cladding stainless steel Welding wire, a diameter of 2.0 ~ 3.2mm；The voltage of inwall welding is 27 ± 3V, and welding current is 240 ~ 400A；Carbon steel layer outer wall welds Using conventional carbon steel solder flux and welding wire, gage of wire is in 3.2 ~ 4.0mm；The voltage of outer wall welding is 27 ± 3V, and welding current is 400~680A；2.0 ~ 3.2m/min of speed of welding.
- 4. ultra-thin interior combined helical pipe tubulation welding method according to claim 1, it is characterised in that：The slitting be by Helix tube caliber and helix tube molding machine group feature determine that the plate of stainless steel composite material tubulation raw material is wide, and wide cut stock roll is passed through The raw band volume for being adapted to the production of helix tube tubulation is prepared after slitting, while checks stock roll quality condition, removes slitting defect.
- 5. ultra-thin interior combined helical pipe tubulation welding method according to claim 1, it is characterised in that：It is described ultra-thin interior multiple The stainless steel composite material raw material coiled sheet gross thickness for closing helix tube is 3.0 ~ 4.0mm.
- 6. ultra-thin interior combined helical pipe tubulation welding method according to claim 1, it is characterised in that：It is described ultra-thin interior multiple The production tube caliber for closing helix tube is 165 ~ 406mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710648641.1A CN107443016A (en) | 2017-08-01 | 2017-08-01 | A kind of ultra-thin interior combined helical pipe tubulation welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710648641.1A CN107443016A (en) | 2017-08-01 | 2017-08-01 | A kind of ultra-thin interior combined helical pipe tubulation welding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107443016A true CN107443016A (en) | 2017-12-08 |
Family
ID=60490679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710648641.1A Pending CN107443016A (en) | 2017-08-01 | 2017-08-01 | A kind of ultra-thin interior combined helical pipe tubulation welding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107443016A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109014793A (en) * | 2018-09-05 | 2018-12-18 | 中国石油集团渤海石油装备制造有限公司 | A kind of manufacturing method of spiral seam thermometal composite welded pipe |
| CN116551238A (en) * | 2023-07-12 | 2023-08-08 | 苏州友得利金属制品有限公司 | Welding process control method and system for galvanized steel pipe |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101085455A (en) * | 2007-06-29 | 2007-12-12 | 吉欣（英德）热轧不锈复合钢有限公司 | Method for Manufacturing helix composite steel tube |
| CN101566256A (en) * | 2009-06-04 | 2009-10-28 | 大连合生科技开发有限公司 | Stainless steel composite steel pipe and manufacturing method thereof |
| CN103028631A (en) * | 2012-11-27 | 2013-04-10 | 浙江金洲管道工业有限公司 | Manufacture process of thin-wall spiral composite steel pipe |
| CN104245216A (en) * | 2012-04-18 | 2014-12-24 | 新日铁住金株式会社 | Electric resistance welding operation management device, electric resistance welding operation management method, and computer program |
| CN104607773A (en) * | 2014-12-11 | 2015-05-13 | 云南昆钢新型复合材料开发有限公司 | Tubulation welding method of stainless steel outer composite tube |
| CN105127237A (en) * | 2015-09-19 | 2015-12-09 | 云南昆钢新型复合材料开发有限公司 | Production method of double-metal abrasion-resistant composite pipe |
-
2017
- 2017-08-01 CN CN201710648641.1A patent/CN107443016A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101085455A (en) * | 2007-06-29 | 2007-12-12 | 吉欣（英德）热轧不锈复合钢有限公司 | Method for Manufacturing helix composite steel tube |
| CN101566256A (en) * | 2009-06-04 | 2009-10-28 | 大连合生科技开发有限公司 | Stainless steel composite steel pipe and manufacturing method thereof |
| CN104245216A (en) * | 2012-04-18 | 2014-12-24 | 新日铁住金株式会社 | Electric resistance welding operation management device, electric resistance welding operation management method, and computer program |
| CN103028631A (en) * | 2012-11-27 | 2013-04-10 | 浙江金洲管道工业有限公司 | Manufacture process of thin-wall spiral composite steel pipe |
| CN104607773A (en) * | 2014-12-11 | 2015-05-13 | 云南昆钢新型复合材料开发有限公司 | Tubulation welding method of stainless steel outer composite tube |
| CN105127237A (en) * | 2015-09-19 | 2015-12-09 | 云南昆钢新型复合材料开发有限公司 | Production method of double-metal abrasion-resistant composite pipe |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109014793A (en) * | 2018-09-05 | 2018-12-18 | 中国石油集团渤海石油装备制造有限公司 | A kind of manufacturing method of spiral seam thermometal composite welded pipe |
| CN109014793B (en) * | 2018-09-05 | 2019-09-10 | 中国石油集团渤海石油装备制造有限公司 | A kind of manufacturing method of spiral seam thermometal composite welded pipe |
| CN116551238A (en) * | 2023-07-12 | 2023-08-08 | 苏州友得利金属制品有限公司 | Welding process control method and system for galvanized steel pipe |
| CN116551238B (en) * | 2023-07-12 | 2023-10-20 | 苏州友得利金属制品有限公司 | Welding process control method and system for galvanized steel pipe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102330034B (en) | X65MS steel-grade spiral welded tube for acidic corrosion environment and manufacturing method thereof | |
| CN100547103C (en) | A kind of method for manufacturing high-strength X 80 steel spiral welded pipe | |
| CN101797600B (en) | Method for manufacturing high-strength X100 steel grade spiral seam submerged arc welded pipe | |
| CN102172814B (en) | Method for manufacturing longitudinal submerged arc welded pipe | |
| CN101886222B (en) | Method for manufacturing high-strength X90 steel grade spiral submerged arc welded pipe | |
| CN106541253A (en) | A kind of production technology of steel pipe | |
| CN101862884B (en) | Pipe-pipe site butt welding method of continuous pipes | |
| CN105817844B (en) | The manufacture method of X80 pipeline steel spiral welded pipes | |
| CN102205458B (en) | Manufacturing method for X120 steel-level spiral seam hidden arc welding tube | |
| CA2640235C (en) | Method of manufacturing lined tubing | |
| WO2009003325A1 (en) | A producing process for a spiral composite steel pipe | |
| CN103212952A (en) | Manufacturing method of super-large-diameter large-wall thick longitudinal submerged arc welded pipe | |
| CN109794733A (en) | A kind of oil-gas transportation X90 grade of steel φ 1524mm super large caliber heavy wall SAW spiral welded pipe and its manufacturing method | |
| CN102383049A (en) | Method for manufacturing low-cost high-toughness X70 steel spiral submerged arc welded pipe | |
| CN102330032B (en) | Acid-proof X70MS steel-grade spiral welded pipe and manufacturing method thereof | |
| CN107443016A (en) | A kind of ultra-thin interior combined helical pipe tubulation welding method | |
| CN108500559B (en) | Manufacturing method of extra-large-pipe-diameter thick-wall X80 steel-grade spiral submerged arc welded pipe | |
| CN102000906A (en) | Longitudinal submerged arc welding production line for stainless steel tubes and carbon steel tubes | |
| CN103028631A (en) | Manufacture process of thin-wall spiral composite steel pipe | |
| CN103481032B (en) | A kind of large thick-wall sulfur resistive tower barrel forming-welding technology | |
| CN108620448A (en) | A kind of major diameter, high strength helical welded tube manufacturing method | |
| CN201969996U (en) | Longitudinal submerged-arc welding production line for stainless-steel pipe and carbon steel pipe | |
| CN106624614B (en) | A kind of manufacturing process of the high-strength welded tube of heavy caliber thick wall | |
| CN104439672A (en) | High frequency prewelding technology of longitudinal submerged arc welded pipe | |
| CN107639359A (en) | A kind of modified welding procedure for thick-walled vessel cylinder longitudinal joint groove |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171208 |