CN105032980B - A kind of manufacturing process of the complicated variable cross-section tubing of thin-wall titanium alloy and application - Google Patents
A kind of manufacturing process of the complicated variable cross-section tubing of thin-wall titanium alloy and application Download PDFInfo
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- CN105032980B CN105032980B CN201510570967.8A CN201510570967A CN105032980B CN 105032980 B CN105032980 B CN 105032980B CN 201510570967 A CN201510570967 A CN 201510570967A CN 105032980 B CN105032980 B CN 105032980B
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Abstract
The present invention relates to a kind of manufacturing process of the complicated variable cross-section tubing of thin-wall titanium alloy and application, belong to materials processing technology field.The size deployed according to variable cross-section heterotype tubing cuts titanium alloy plate, obtain special-shaped titanium plate, special-shaped titanium plate, cavity plate, upper mould are placed in diffusion connection equipment, core is completely forced into cavity plate after heating, left and right mould is fed, sheet material is closed into heterotype tubing, push workbench, it is heated to after diffusion welding craft temperature carrying out joint Diffusion Welding, cooling, pickup obtains the complicated variable cross-section tubing of thin-wall titanium alloy.The present invention only can obtain the high-quality titanium alloy variable cross-section tubing that wall thickness is visibly homogeneous, dimensional accuracy is very high, weld seam is almost invisible by two procedures, a thermal cycle, can be achieved to produce in enormous quantities.
Description
Technical field
The present invention relates to a kind of manufacturing process of the complicated variable cross-section tubing of thin-wall titanium alloy and application, belong to material processing skill
Art field.
Background technology
Titanium alloy pipe because its specific strength it is high, wear-resistant, it is corrosion-resistant be widely used in the fields such as aviation, mechanical chemical industry.
With the development of every profession and trade, product form becomes more diverse, the thin wall special-shaped variable cross-section titanium alloy pipe market demand
Increasingly increase.Because titanium alloy temperature-room type plasticity is poor, after shaping, resilience is serious, traditional piping material manufacturing process (such as RBE methods, row's roller
The formula method of forming, W back-flexing methods etc.) it is difficult to apply in titanium alloy pipe shapes, therefore the titanium alloy that in the market is sold
The equal pipe that the tubing overwhelming majority is prepared for extruding or drawing.At present, the method for making titanium alloy radius-variable pipe mainly has metal plate drawing
Deep flat welding process, pipe enlarging technique and superplastic gas-bulging technique.
Metal plate drawing flat welding process is to split reducer pipe along center line, drawing is distinguished to two parts after segmentation, through laser
Weldering or argon arc welding are by two U-shaped part soldering.This method requires high to welding procedure and frock, easily occurs dislocation or welding becomes
Shape, yield rate is not high；Drawing sequence technique end is inevitable, increases cost；Drawing sequence sheet material is thinned to be uneven, final pipe
Material evenness of wall thickness is poor；Weld seam is, it is apparent that welding seam tissue capability is less than mother metal；It is not suitable for producing in enormous quantities.
Pipe enlarging technique is that the titanium alloy pipe for being sold market is extruded by mould and forms variable cross-section special pipe
The method of material, but it is difficult to for complicated shape special section tubular product once-forming, and Thickness Distribution is extremely uneven.
Superplastic gas-bulging technique is a kind of method of the special-shaped titanium tube shaping proposed using titanium alloy superplasticity.By tubing two
End sealing, is heated to 900 DEG C of process above temperature, makes pipe deformations by argon pressurization.The special pipe quality that this method is obtained
Very well, but shaping rate is extremely slow, it is not suitable for producing in enormous quantities.In addition, tube wall thickness skewness obtained by superplastic gas-bulging,
The larger position of deflection is thinned seriously, easily produces stress concentration in large deformation region and influences tubing service life.Accordingly, it is difficult to
Suitable for requiring high product manufacturing to evenness of wall thickness.
Requirement more and more higher with Aerospace Products to flying speed, traditional magnadure part is produced in high-speed friction
Easily aoxidized or unstability at a high temperature of life, and titanium alloy has the excellent properties such as high-melting-point, wear-resistant, high specific strength, is more suitable for
The material manufactured as high-speed aircraft parts.It is dispersed with aircraft interior and is largely used to connection heat exchanger, fuel
The titanium alloy pipeline of the parts such as room, steam turbine, to save aircraft interior space, each connecting pipeline is generally according to adjacent parts
Position and be designed to complexity variable cross-section heterotype tubing.Pipeline connection shown in accompanying drawing 1 is used as typical case with TC4 titanium alloy products
Exemplar, the product two ends caliber gap is very big, miner diameter end outside dimension about 34 × 20mm, and bigger diameter end outside dimension about 48 ×
48mm, size differ by about one time, global shape is similar to the oval pipe of variable cross-section, and caliber uniformly increases from miner diameter end, away from
Bigger diameter end mouthful about 100mm positions caliber is undergone mutation, and bigger diameter end gap is used to coordinate with other parts.But this product pair
Require high in tubing commissure, weld strength should be suitable with mother metal, and weld seam need to be tiny or invisible.At present, for this kind of
The manufacturing process of pipe fitting mainly passes through metal plate drawing, laser flat welding process or SPF Technology, but because process control is numerous
Trivial, forming quality is unstable, Thickness Distribution is uneven, cost control is difficult, the not high factor limitation of processing efficiency, it is difficult to realize
Produce in enormous quantities.
The content of the invention
To solve the deficiencies in the prior art, the invention provides a kind of shaping side of the complicated variable cross-section tubing of thin-wall titanium alloy
Method, the technical scheme of use is as follows：
It is an object of the invention to provide a kind of manufacturing process of the complicated variable cross-section tubing of thin-wall titanium alloy, this method be by
The size deployed according to variable cross-section heterotype tubing cuts titanium alloy plate, obtains special-shaped titanium plate, and special-shaped titanium plate, cavity plate, upper mould are pacified
It is placed in diffusion connection equipment, core is completely forced into cavity plate after heating, left and right mould is fed, sheet material is closed into special pipe
Material, pushes workbench, is heated to after diffusion welding craft temperature carrying out joint Diffusion Welding, cooling, pickup obtains thin-wall titanium
Alloy complexity variable cross-section tubing.
Methods described, step is as follows：
1) titanium alloy plate is cut according to the developed dimension of variable cross-section heterotype tubing, obtains special-shaped titanium plate；
2) cavity plate, core, on the position that is contacted with tubing of mould, left and right mould spray solder resist；
3) special-shaped titanium plate, cavity plate and upper mould are placed in diffusion connection equipment；
4) technological temperature is heated to, makes sheet material forming by controlling core loading speed, until core drives special-shaped titanium plate
It is completely forced into cavity plate；
5) left and right mould is fed, sheet material is closed into heterotype tubing；
6) workbench is pushed, and is heated to diffusion welding craft temperature, joint Diffusion Welding is carried out after insulation；
7) cool according to set annealing process, pickup obtains the complicated variable cross-section tubing of thin-wall titanium alloy.
Preferably, step 1) titanium alloy plate, thickness is 0.2mm-0.5mm, the titanium alloy trade mark be TC4, TA15 or
Ti55。
Preferably, step 2) cavity plate, with complicated variable cross-section tubing outer shape identical die cavity；The core,
It is identical with complicated variable cross-section tubing inner shape；The upper mould is identical with complicated variable cross-section tubing position while welding curvature；The left side
Right mould, complicated variable cross-section tubing outer shape identical die cavity is formed with being surrounded with cavity plate.
Preferably, step 3) the special-shaped titanium plate, cavity plate and upper mould, center line alignment.
Preferably, step 4) heating, temperature is less than 200 DEG C；The core loading speed, is 0.2mm/s-
0.5mm/s。
Preferably, step 6) the diffusion welding craft temperature is 900 DEG C -970 DEG C；The insulation, the time is 10-
15min。
Preferably, step 7) the set annealing process, 1-2 hours are incubated to be furnace-cooled to 800 DEG C -900 DEG C, to be not more than
50 DEG C/h rate of temperature fall is furnace-cooled to less than 700-750 DEG C, is air-cooled to room temperature.
Preferably, methods described is concretely comprised the following steps：
1) titanium alloy plate is cut according to the developed dimension of variable cross-section heterotype tubing, obtains special-shaped titanium plate；
2) cavity plate, core, on the position that is contacted with tubing of mould, left and right mould spray solder resist；The cavity plate, with complexity change
Section tubing outer shape identical die cavity；The core, be and complicated variable cross-section tubing inner shape identical mould；It is described
Upper mould, be and complicated variable cross-section tubing position while welding curvature identical mould；The left and right mould, is to surround to form complexity with cavity plate
The mould of variable cross-section tubing outer shape.
3) special-shaped titanium plate, cavity plate and upper mould are placed in diffusion connection equipment, and adjusting position makes three's center line pair
Together；
4) less than 200 DEG C of technological temperature is heated to, makes sheet material by controlling core loading speed 0.2mm/s-0.5mm/s
Shaping, until core is completely forced into cavity plate；
5) left and right mould is fed, sheet material is closed into heterotype tubing；
6) workbench is pushed, and is heated to progress after 900 DEG C -970 DEG C of diffusion welding craft temperature, insulation 10-15min
Joint Diffusion Welding；
7) cool according to set annealing process, pickup obtains the complicated variable cross-section tubing of thin-wall titanium alloy；The set annealing
Technique, for be furnace-cooled to 800 DEG C -900 DEG C be incubated 1-2 hours, be not more than 50 DEG C/h rate of temperature fall be furnace-cooled to 700-750 DEG C with
Under, it is air-cooled to room temperature.
Application of the above either method in the complicated variable cross-section tubing forming technology of thin-wall titanium alloy.
Beneficial effect of the present invention：
1. the invention provides a kind of shaping side for being capable of the complicated variable cross-section thin-wall titanium alloy tubing of Quick-forming high accuracy
Method, using metal plate forming coordinate diffusion welding craft, by once it is die-filling completion two processing steps, while by diffusion welding (DW) process with
Heat treatment step is organically combined, and a thermal cycle can obtain without residual stress, high dimensional accuracy, high weld strength and fine weldering
The titanium alloy variable cross-section tubing of seam, produces in enormous quantities for the product and provides solid technology guarantee.
2. the inventive method is only obtained with by two procedures, a thermal cycle, wall thickness is visibly homogeneous, dimensional accuracy
The almost invisible high-quality titanium alloy variable cross-section tubing of very high, weld seam, can be achieved to produce in enormous quantities, is great perspective.
3. the inventive method is applied to produce high dimensional accuracy, no-welding-seam, the product of uniform wall thickness in enormous quantities, mesh is solved
The present situation of preceding market such product shortage.
Brief description of the drawings
Fig. 1 is connecting tube product structure.
Fig. 2 pushes core for the present invention；
Fig. 3 is mould matched moulds in left and right of the present invention；
Fig. 4 is Ccope closing machine of the present invention；
(1, core；2, sheet material；3, alignment pin；4, cavity plate；5,6 or so moulds；7, upper mould).
Embodiment
With reference to specific embodiment, the present invention will be further described, but the present invention should not be limited by the examples.
Embodiment 1：
The method for present embodiments providing a kind of complicated variable cross-section tubing superplastic air bulge of thin-wall titanium alloy, specific steps
It is as follows：
1) end socket with inlet channel is welded in tubing one end；
2) position contacted in cavity plate, punch-pin with tubing sprays solder resist；And be placed on the tubing with inlet channel
In concave die cavity, matched moulds；
3) to high-purity argon gas is passed through inside mould and tubing, vacuumize, 3 times repeatedly, to discharge gas inside mould and tubing
Body；
4) SPF Technology temperature (being usually 950 DEG C) is heated to, insulation ensures that mould and tubing temperature are equal for 1 hour
It is even, by inlet channel to high-purity argon gas is slowly introducing inside tubing, make during pipe deformations strain rate control 5 ×
10-4/ s or so, curring time about 3 hours unloads air pressure, and is cooled to less than 200 DEG C with 50 DEG C/h speed, is air-cooled to room temperature；
5) opening mold, takes out tubing；
6) tubing is connected to the technique tip cut-off of inlet channel by the way of wire cutting, that is, obtains complicated varying cross-section duct
Material.
The die joint that the mould therefor of example 2 below -3 die joint is formed by tubing cross section greatest width dimension is true
Fixed, mould composition and each several part shape and structure are as follows：Cavity plate, with die joint shape phase under complicated variable cross-section pipe outer surface
Same die cavity, cavity plate maximum open size is matched with tubing cross section full-size, and one is opened up respectively in concave die cavity both sides
The inverted trapezoidal groove of depthkeeping degree, groove insertion die edge and concave die cavity；Left and right mould, with complicated variable cross-section tubing appearance
Die joint shape identical die cavity on face, left and right mold cavity side sets raised to the inverted trapezoidal of cooperation with cavity plate respectively, convex
Play a part of to be oriented to and position restriction to play left and right mould feeding with cavity plate fit depressions, left and right mould upper end is opened up tiltedly
Slope, preferably 25 °；Core, identical with complicated variable cross-section tubing inner surface configuration, core one end sectional dimension is more than the other end,
In order to shape terminate after be stripped；Upper mould, identical with complicated variable cross-section tubing position while welding curvature, upper mould lower end opens up slope,
Preferably 25 °, it is combined into the breach to be formed with left and right mould and is engaged.
It is embodiment 2-3 fundamental diagram as shown in Figure 2-4.
Embodiment 2
A kind of manufacturing process of the complicated variable cross-section tubing of thin-wall titanium alloy is present embodiments provided, is comprised the following steps that：
1) titanium alloy plate is cut according to the developed dimension of variable cross-section heterotype tubing, obtains special-shaped titanium plate, titanium plate wall used
Thickness is 0.2mm, and material is TC4 titanium alloys；
2) cavity plate, core, on the position that is contacted with tubing of mould, left and right mould spray solder resist；The cavity plate, be and complexity
Variable cross-section tubing outer shape identical die cavity；The core, be and complicated variable cross-section tubing inner shape identical mould；Institute
Mould is stated, is and complicated variable cross-section tubing position while welding curvature identical mould；The left and right mould, is to surround to form multiple with cavity plate
The mould of miscellaneous variable cross-section tubing outer shape.
3) special-shaped titanium plate, cavity plate and upper mould are placed in diffusion connection equipment, and three's center line is alignd；
4) 200 DEG C of technological temperature is heated to, makes sheet material forming by controlling core loading speed for 0.2mm/s, until
Core is completely forced into cavity plate；
5) left and right mould is fed, sheet material is closed into heterotype tubing；
6) workbench is pushed, and is heated to progress joint diffusion after 925 DEG C of diffusion welding craft temperature, insulation 10min
Welding；
7) cool according to annealing temperature process curve, annealing process is to be furnace-cooled to 850 DEG C to be incubated 1.5 hours, to be not more than
50 DEG C/h rate of temperature fall is furnace-cooled to less than 700 DEG C, is air-cooled to room temperature, and pickup obtains the complicated variable cross-section tubing of thin-wall titanium alloy.
Embodiment 3
A kind of manufacturing process of the complicated variable cross-section tubing of thin-wall titanium alloy is present embodiments provided, is comprised the following steps that：
A kind of manufacturing process of the complicated variable cross-section tubing of thin-wall titanium alloy is present embodiments provided, is comprised the following steps that：
1) titanium alloy plate is cut according to the developed dimension of variable cross-section heterotype tubing, obtains special-shaped titanium plate, titanium plate wall used
Thickness is 0.5mm, and material is Ti55 titanium alloys；
2) cavity plate, core, on the position that is contacted with tubing of mould, left and right mould spray solder resist；The cavity plate, be and complexity
Variable cross-section tubing outer shape identical die cavity；The core, be and complicated variable cross-section tubing inner shape identical mould；Institute
Mould is stated, is and complicated variable cross-section tubing position while welding curvature identical mould；The left and right mould, is to surround to form multiple with cavity plate
The mould of miscellaneous variable cross-section tubing outer shape.
3) special-shaped titanium plate, cavity plate and upper mould are placed in diffusion connection equipment, and three's center line is alignd；
4) 200 DEG C of technological temperature is heated to, makes sheet material forming by controlling core loading speed for 0.5mm/s, until
Core is completely forced into cavity plate；
5) left and right mould is fed, sheet material is closed into heterotype tubing；
6) workbench is pushed, and is heated to progress joint diffusion after 970 DEG C of diffusion welding craft temperature, insulation 15min
Welding；
7) cool according to annealing temperature process curve, annealing process is to be furnace-cooled to 900 DEG C to be incubated 2 hours, to be not more than 50
DEG C/h rate of temperature fall is furnace-cooled to less than 750 DEG C, is air-cooled to room temperature, pickup obtains the complicated variable cross-section tubing of thin-wall titanium alloy.
Embodiment 4
A kind of manufacturing process of the complicated variable cross-section tubing of thin-wall titanium alloy is present embodiments provided, is comprised the following steps that：
1) titanium alloy plate is cut according to the developed dimension of variable cross-section heterotype tubing, obtains special-shaped titanium plate, titanium plate wall used
Thickness is 0.3mm, and material is TA15 titanium alloys；
2) cavity plate, core, on the position that is contacted with tubing of mould, left and right mould spray solder resist；The cavity plate, be and complexity
Variable cross-section tubing outer shape identical die cavity；The core, be and complicated variable cross-section tubing inner shape identical mould；Institute
Mould is stated, is and complicated variable cross-section tubing position while welding curvature identical mould；The left and right mould, is to surround to form multiple with cavity plate
The mould of miscellaneous variable cross-section tubing outer shape.
3) special-shaped titanium plate, cavity plate and upper mould are placed in diffusion connection equipment, and three's center line is alignd；
4) 200 DEG C of technological temperature is heated to, makes sheet material forming by controlling core loading speed for 0.25mm/s, until
Core is completely forced into cavity plate；
5) left and right mould is fed, sheet material is closed into heterotype tubing；
6) workbench is pushed, and is heated to progress joint diffusion after 900 DEG C of diffusion welding craft temperature, insulation 10min
Welding；
Cool according to annealing temperature process curve, annealing process is to be furnace-cooled to 800 DEG C to be incubated 2 hours, to be not more than 50
DEG C/h rate of temperature fall is furnace-cooled to less than 720 DEG C, is air-cooled to room temperature, pickup obtains the complicated variable cross-section tubing of thin-wall titanium alloy.
Embodiment 5
The present embodiment is determined to the quality of the tubing prepared by embodiment 1-4, and measurement result is as shown in table 1.
The quality of bending tubing prepared by the embodiment 1-4 of table 1
As it can be seen from table 1 forming method provided by the present invention is in evenness of wall thickness control, forming efficiency, weld seam matter
Existing method is substantially better than in terms of amount, mechanical performance holding degree, in addition with traditional pipe enlarging, drawing plate flat welding process phase
Than forming method sharpest edges provided by the present invention are tubing without residual stress, it is ensured that high appearance and size precision.
The inventive method is only obtained with that wall thickness is visibly homogeneous by two procedures, a thermal cycle, dimensional accuracy very
The almost invisible high-quality titanium alloy variable cross-section tubing of high, weld seam, it is adaptable to produce in enormous quantities high dimensional accuracy, no-welding-seam,
The product of uniform wall thickness, solves the present situation of existing market such product shortage.
Although the present invention is disclosed as above with preferred embodiment, it is not limited to the present invention, any to be familiar with this
The people of technology, without departing from the spirit and scope of the present invention, can do various changes and modification, therefore the protection of the present invention
What scope should be defined by claims is defined.
Claims (5)
1. the manufacturing process of the complicated variable cross-section tubing of a kind of thin-wall titanium alloy, it is characterised in that step is as follows：
1）Titanium alloy plate is cut according to the developed dimension of variable cross-section tubing, special-shaped titanium alloy plate is obtained；
2）Cavity plate, core, on the position that is contacted with tubing of mould, left and right mould spray solder resist；
3）Special-shaped titanium alloy plate, cavity plate and upper mould are placed in diffusion connection equipment；
4）Be heated to less than 200 DEG C of technological temperature, by control core loading speed 0.2mm/s-0.5mm/s make sheet material into
Shape, until core drives special-shaped titanium alloy plate to be completely forced into cavity plate；
5）Left and right mould is fed, sheet material is closed into heterotype tubing；
6）Workbench is pushed, and is heated to progress after 900 DEG C -970 DEG C of diffusion welding craft temperature, insulation 10min-15min
Joint Diffusion Welding；
7）Cool according to set annealing process, pickup obtains the complicated variable cross-section tubing of thin-wall titanium alloy；The set annealing process,
- 2 hours 1 hour are incubated to be furnace-cooled to 800 DEG C -900 DEG C, less than 700 DEG C, air cooling are furnace-cooled to be not more than 50 DEG C/h rate of temperature fall
To room temperature.
2. method as claimed in claim 1, it is characterised in that step 1）The titanium alloy plate, thickness is 0.2mm-0.5mm,
The titanium alloy trade mark is TC4, TA15 or Ti55.
3. method as claimed in claim 1, it is characterised in that step 2）The cavity plate, with complicated variable cross-section tubing on the outside of
Shape identical die cavity；The core is identical with complicated variable cross-section tubing inner shape；The upper mould, with complicated varying cross-section duct
Material position while welding curvature is identical；The left and right mould, complicated variable cross-section tubing outer shape identical is formed with being surrounded with cavity plate
Die cavity.
4. method as claimed in claim 1, it is characterised in that step 3）The special-shaped titanium alloy plate, cavity plate and upper mould, center
Line aligns.
5. method as claimed in claim 1, it is characterised in that concretely comprise the following steps：
1) titanium alloy plate is cut according to the developed dimension of variable cross-section tubing, obtains special-shaped titanium alloy plate；
2) cavity plate, core, on the position that is contacted with tubing of mould, left and right mould spray solder resist；The cavity plate, with complexity
Variable cross-section tubing outer shape identical die cavity；The core, be and complicated variable cross-section tubing inner shape identical mould；Institute
Mould is stated, is and complicated variable cross-section tubing position while welding curvature identical mould；The left and right mould, is to surround to be formed with cavity plate
The mould of complicated variable cross-section tubing outer shape；
3) special-shaped titanium alloy plate, cavity plate and upper mould are placed in diffusion connection equipment, and adjusting position makes three's center line
Alignment；
4) be heated to less than 200 DEG C of technological temperature, by control core loading speed 0.2mm/s-0.5mm/s make sheet material into
Shape, until core is completely forced into cavity plate；
5) left and right mould is fed, sheet material is closed into heterotype tubing；
6) workbench is pushed, and is heated to 900 DEG C -970 DEG C of diffusion welding craft temperature, joint is carried out after being incubated 10-15min
Diffusion Welding；
7) cool according to set annealing process, pickup obtains the complicated variable cross-section tubing of thin-wall titanium alloy；The set annealing process,
1-2 hours are incubated to be furnace-cooled to 800 DEG C -900 DEG C, less than 700 DEG C is furnace-cooled to be not more than 50 DEG C/h rate of temperature fall, is air-cooled to room
Temperature.
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| CN201510570967.8A CN105032980B (en) | 2015-09-09 | 2015-09-09 | A kind of manufacturing process of the complicated variable cross-section tubing of thin-wall titanium alloy and application |
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| CN201510570967.8A CN105032980B (en) | 2015-09-09 | 2015-09-09 | A kind of manufacturing process of the complicated variable cross-section tubing of thin-wall titanium alloy and application |
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| CN106881561A (en) * | 2015-12-15 | 2017-06-23 | 航天特种材料及工艺技术研究所 | A kind of preparation method of titanium alloy thin wall multilayer hollow structure |
| CN106637014A (en) * | 2016-12-07 | 2017-05-10 | 陕西宏远航空锻造有限责任公司 | Heat treatment method for reducing nonuniformity and dimensional instability of large-size TC4 forging |
| CN109266986B (en) * | 2018-10-29 | 2020-11-10 | 成都先进金属材料产业技术研究院有限公司 | Preparation method of TC4 wide and thick plate with excellent comprehensive performance |
| CN110778803A (en) * | 2019-10-30 | 2020-02-11 | 西安圣泰金属材料有限公司 | Thin-wall high-precision titanium alloy seamless square and rectangular pipe and manufacturing method and application thereof |
| CN112254577A (en) * | 2020-10-19 | 2021-01-22 | 香河星通科技有限公司 | Multi-curved-surface titanium alloy plate and forming method thereof |
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| JPS5811314B2 (en) * | 1979-03-09 | 1983-03-02 | 古河電気工業株式会社 | Method for manufacturing thin-walled metal tubes |
| JPS58122122A (en) * | 1982-01-14 | 1983-07-20 | Hitachi Ltd | Method and apparatus for forming cylindrical body |
| DE102005006579B3 (en) * | 2005-02-11 | 2006-03-30 | Benteler Automobiltechnik Gmbh | Production of tubes comprises providing sheet metal plates with contact bumps suitable for a resistance welding process before deformation along longitudinal sides to be joined together |
| CN102821886B (en) * | 2010-03-26 | 2015-06-24 | 新日铁住金株式会社 | Method and apparatus for manufacturing uoe steel pipe |
| CN102500907A (en) * | 2011-10-26 | 2012-06-20 | 首都航天机械公司 | Method for precise control of diffusion welding / stop welding region |
| KR101406633B1 (en) * | 2012-05-14 | 2014-06-11 | 주식회사 포스코 | Pipe making method and pipe making device |
| JP5454619B2 (en) * | 2012-05-28 | 2014-03-26 | Ｊｆｅスチール株式会社 | Closed-section structure forming method and closed-section structure forming apparatus |
| JP5868891B2 (en) * | 2012-05-29 | 2016-02-24 | Ｊｆｅスチール株式会社 | Manufacturing method of different diameter tubular parts |
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