CN101382216B - Counter bending copper-aluminium tube joint, method for producing same and special core rod - Google Patents
Counter bending copper-aluminium tube joint, method for producing same and special core rod Download PDFInfo
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- CN101382216B CN101382216B CN2007101457565A CN200710145756A CN101382216B CN 101382216 B CN101382216 B CN 101382216B CN 2007101457565 A CN2007101457565 A CN 2007101457565A CN 200710145756 A CN200710145756 A CN 200710145756A CN 101382216 B CN101382216 B CN 101382216B
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- joint
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- 238000005452 bending Methods 0.000 title claims abstract description 25
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 title claims description 35
- 238000004519 manufacturing process Methods 0.000 title description 4
- 238000003466 welding Methods 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 97
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 96
- 229910052802 copper Inorganic materials 0.000 claims description 83
- 239000010949 copper Substances 0.000 claims description 83
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 81
- 239000004411 aluminium Substances 0.000 claims description 22
- 230000000694 effects Effects 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005336 cracking Methods 0.000 abstract description 4
- 229910017767 Cu—Al Inorganic materials 0.000 abstract 4
- 238000003825 pressing Methods 0.000 abstract 1
- 229910000679 solder Inorganic materials 0.000 abstract 1
- 230000005496 eutectics Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 238000000637 aluminium metallisation Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000006023 eutectic alloy Substances 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded joints
- F16L13/0218—Welded joints having an inner or outer ring
- F16L13/0236—Welded joints having an inner or outer ring having an outer ring
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention relates to a Cu-Al pipe welding joint, a preparation method and a special core rod thereof. In the Cu-Al pipe welding joint, the welding joint of a Cu pipe is provided with a conical solder side provided with a straight tubular guiding part; the external diameter of the guiding part is slightly less than the internal diameter of an Al pipe; the length of the Cu pipe exceeds the high-temperature plastic deformation area of the Al pipe; the internal surface of the guiding part is provided with cracking troughs in the axial direction. Therefore, when the joint is in use, the cracking of Al pipe due to bending of joint is prevented. In order to prepare the Cu-Al pipe welding joint, the preparation method mainly comprises the steps as follows: during the welding process, a special core rod with two functions of impressing and flaring is arranged in the Cu pipe in the Cu pipe direction and is connected on the flaring thrusting connecting rod of a welding machine, and subsequently arranged in a movable electrode group; after the turn-off of the welding, the correction, channel-pressing and flaring on the internal hole of the welding joint are carried out by the core rod so as to prepare the Cu-Al pipe welding joint which can prevent the cracking of the Al pipe due to the bending of the joint when in use.
Description
Technical field
The present invention relates to a kind of dissimilar metal welding joint, especially copper aluminum pipe welded joint.
The invention still further relates to the preparation method and the special core rod of above-mentioned welded joint.
Background technique
In recent years, because the copper valency is constantly raising up, promoted the market application area of aluminium for copper material technological progress and related industry.China is copper resource relative shortage, the country that bauxite resource is abundant relatively, and refrigeration industry uses copper pipe in a large number at present, and copper changes aluminium reduction manufacture cost and has become crucial problem.But the copper pipe wall thickness majority that refrigeration industry relates to is below 1.0mm; Because it is alternative fully that the peculiar advantage of copper pipe at aspects such as refrigeration pipe production and processing, after-sales services is difficult to by aluminum pipe, all adopt aluminum pipe to replace copper pipe can bring problems.And the centre be the aluminium two ends is copper aluminum bronze structure pipelines of copper, then because switching performance is identical with copper pipe, can replace copper pipe fully.
Copper pipe and aluminum pipe fusing point differ about 400 ℃; again because the aluminum pipe internal surface is furnished with oxide layer; especially in the thin wall copper aluminum pipe welding, two kinds of materials are difficult to realize that two kinds of direct chemical keys between metallic atom connect, and can produce copper aluminium eutectic structure transition layer usually between two kinds of materials of copper aluminium.The mentioned eutectic structure of this specification is meant the copper aluminum eutectic alloy that copper aluminum metallization compound and aluminium form under the high temperature.
In the at present known various welding methods of thin wall copper aluminum pipe welding, if adopt copper pipe to be inserted into telescopic lap splice in the aluminum pipe, the chemical bond that how to obtain between the copper aluminium connects, and to avoid producing copper aluminium eutectic structure in weld seam be key technology.Though the top power before methods such as plane butt joint energy storage welding and friction welding can finish by welding reduces the eutectic structure of copper aluminum pipe weld seam, but its joint structure has determined this technology can only be fit to the welding of wall thickness greater than the heavy wall copper aluminum pipe of 1.25mm, can not be used for thin wall copper aluminum pipe welding involved in the present invention.The telescopic lap splice that copper pipe is inserted in the aluminum pipe is fit to the thin wall copper aluminum pipe welding, adopt highfrequency welding, method for welding welding, owing to have reactive pore, copper aluminium eutectic structure, potential unfavorable factors such as corrosion hidden danger, can not realize that copper aluminum chemistry bond closes, it is also very big to realize producing difficulty in batches; Adopt the resistor pressure complex welding method, can overcome the problems referred to above, but the copper-aluminium joint bending resistance is slightly inadequate, i.e. the crooked 45 degree back aluminum pipe sides that surpass of butt joint fracture easily, and these technological deficiencies have all hindered the application of aluminum pipe at refrigeration industry.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of resistant to bending copper-aluminium tube joint, makes joint joint when crooked 90 spend seepage phenomenon that do not ftracture.
Another technical problem that the present invention will solve provides a kind of preparation method and special core rod of producing aforementioned copper-aluminium tube joint.
For resistant to bending copper-aluminium tube joint of the present invention, the problems referred to above are to solve like this: there is the taper face of weld of band straight tube-like guide portion at the welded joint position of copper pipe, the external diameter of this guide portion is slightly smaller than the aluminum pipe internal diameter, and the length that is inserted into the copper pipe guide portion of aluminum pipe inside should guarantee that its apical position surpasses aluminum pipe side pyroplastic deformability zone in the welded joint after welding.In welding process, be subjected to the effect of resistance heat and the acting in conjunction of end thrust, 10mm is in molten state with interior aluminum pipe apart from copper and aluminium welding seam outer surface, strong plastic deformation takes place in this part aluminum pipe under the acting in conjunction of high temperature and high pressure, cooling back mechanical property obviously reduces, be easy to fracture, this position of aluminum pipe is the pyroplastic deformability zone.The internal surface of guide portion has the equally distributed groove that splits vertically.Splitting groove can be impression, cut, also can press, thereby run through the guide portion tube wall.When in the copper aluminum pipe welded joint using process, being subjected to bending force, the guide portion top of lengthening has extended to beyond the pyroplastic deformability zone, thereby avoided the aluminum pipe district of poor-performing, the guide portion top of lengthening has withstood on plasticity preferably on the aluminum pipe position, is not easy to destroy aluminum pipe; Simultaneously, after guide portion is subjected to the pressure of aluminum pipe bending, owing to split the effect of groove, forms sheet and support, guide portion obviously reduces the support of aluminum pipe, therefore can not push up and split aluminum pipe.Form direct chemical bond between copper pipe taper face of weld and the aluminum pipe inwall and is connected, no copper aluminium eutectic structure in the weld seam, so when copper-aluminium tube joint is subjected to tension, the splitting groove and can expand of guide portion, but the copper and aluminium welding of not having an eutectic structure is stitched the zone and crackle can not taken place.The mentioned eutectic structure of this specification is meant the low melting point eutectic alloy that copper aluminum metallization compound and aluminium form under the high temperature.
The special core rod of using for the resistant to bending copper-aluminium joint of production of the present invention, the problems referred to above are to solve like this, and plug is multistage string style, and front end is the finishing portion that annular collar type projection is arranged, for the indent portion of pointed projections arranged, indent portion after be the expansion mouth of annular collar type projection thereafter.
For the preparation method of above-mentioned resistant to bending copper-aluminium tube joint, the problems referred to above are to solve like this: get each one of copper pipe, aluminum pipe, copper pipe one end is done to close up handle, the guide portion length of closing in place surpasses aluminum pipe pyroplastic deformability zone.During welding, plug is put into copper pipe, be connected on the thrust link of welding machine from the copper pipe direction.To have the copper pipe that welds plug is placed in the traveling electrode group, with the fixing copper pipe of high pressure cylinder, aluminum pipe is placed in the fixed electrode and fixing aluminum pipe, mosaic block with the material of high-fire resistance and low heat transfer efficient is installed on the welding position of fixed electrode aluminum pipe, and mosaic block cavity shape and aluminum pipe profile match.During welding the aluminum pipe end is flushed with the mosaic block edge, the pushing tow cylinder will have the traveling electrode group of copper pipe and push aluminum pipe to, pressure control is advisable at 250kg～550kg, switch on simultaneously resistance heating is carried out in copper aluminium bond zone, copper pipe is constantly inner mobile to aluminum pipe under the effect of pushing tow cylinder, in moving process, the propelling pressure of copper pipe and welding current are adjusted parameters such as electric current, voltage, air pressure automatically, the temperature of control copper and aluminium welding seam.After the outage, the plug that is preset at copper pipe inside is pushed the aluminum pipe direction to along copper pipe fast under the promotion of welding equipment.Utilize the finishing portion of plug that the welded joint endoporus is repaired, indent portion extrudes tangible indent with the inwall of copper pipe guide portion, expansion mouth enlarges the internal diameter of guide portion, and the external diameter of guide portion is attached on the inwall of aluminum pipe, thereby enlarges the traffic level of pipeline inside.In the hole enlargement process, there is indent owing to the guide portion surface, artificially improved stress concentration factor, therefore several can occur at guide portion after the hole enlargement and split groove, thereby slacken the resistivity of guide portion, reduce the curved danger of splitting of welded joint aluminum pipe quilt in the follow-up use the aluminum pipe bending.
Said method possesses following beneficial effect:
Copper pipe guide portion through special processing in use can prevent the aluminum pipe cracking that the butt joint bending causes;
The plug default at the closing in end of copper pipe welding part has two effects, extruding deep indent on the inwall of guide portion, carrying out the hole enlargement processing to getting copper-aluminium joint after welding.
Utilize the difference of two kinds of materials of copper aluminium on hardness, the high pressure effect when promptly utilizing copper pipe to insert aluminum pipe is cleaned out the oxide of aluminum pipe internal surface, thereby is avoided using any auxiliary agent;
Energising is carried out resistance heating to the bond zone in cleaning aluminum pipe oxide, the limit adds the flanging heating, reduce copper aluminium eutectic structure growing amount, prevent the copper pipe distortion, the copper aluminium eutectic structure of generation is also extruded by the high pressure between copper aluminium, has improved the combination property of joint;
The aluminum pipe of joint forms the remelting aluminum metal on the copper pipe outer surface under the synthesis of high pressure, resistance heat, form the big plug-in type copper aluminum pipe welded joint structure of fusion area;
Observe under 100 power microscopes, formed the copper and aluminium welding seam that does not have copper aluminium eutectic structure in the aluminum pipe side of joint, what form between the copper aluminium in the weld seam is that chemical bond connects;
For improving the indent operation that the guide portion stress concentration factor is processed, also can press, thereby run through the guide portion tube wall, also can before the welding assembling, finish.
For obtaining better welding quality, copper pipe can be selected copper tube for use, and aluminum pipe can be selected pure aluminum tube or antirust aluminum pipe for use.
Description of drawings
Fig. 1 is resistant to bending copper-aluminium tube joint figure
Fig. 2 is an assembling schematic representation before the resistant to bending copper-aluminium tube joint welding
Fig. 3 is that resistant to bending copper-aluminium tube joint welding finishes schematic representation
Fig. 4 is a copper pipe processing schematic representation
The implication of label in the accompanying drawing:
Embodiment
Specific embodiment one:
According to the requirement of pipeline Design of length, choose identical copper pipe of external diameter of pipe and aluminum pipe and carry out preliminary working, obtain short copper pipe 3 and aluminum pipe 12.At first the welding part with copper pipe 3 pipe ends is processed into the undergauge shape that front end has guide portion 9, inserts in the aluminum pipe 12 for ease of copper pipe 3, and the external diameter of guide portion 9 should be slightly less than the internal diameter of aluminum pipe 12.The diameter and the wall thickness of aluminum pipe 12 end faces to be welded remain unchanged.
Put into a plug 2 in advance in the inside of copper pipe 3, the copper pipe 3 that will have plug 2 places on the resistor pressure welding machine traveling electrode 4, and plug 2 is connected on the end thrust connecting rod 1; Aluminum pipe 12 ports are not done further processing, keep wall thickness and diameter original state, place on the fixed electrode 10 of resistor pressure welding machine.On fixed electrode 10, be inlaid with hard ceramic mosaic block 11, to reduce thermal conductivity, to improve resistivity, the flow path of standard welding current.By the resistor pressure welding machine copper pipe on traveling electrode 4 and the electrode thereof 3 is moved horizontally in the insertion aluminum pipe 12.In the grafting process, taper face of weld 8 grinds away the oxide layer on soft aluminum pipe 12 inwalls, simultaneously to traveling electrode 4, fixed electrode 10 energisings, under the effect of resistance heat, the face of weld of aluminum pipe 12 melts rapidly, the aluminium liquid of inner fusing is filled out between aluminum pipe 12 and the guide portion 9, enter disconnection welding power source in back in the aluminum pipe 12 until taper face of weld 8 bags, thrust link 1 action, fast plug is pushed to the aluminum pipe direction, at first utilize the 7 pairs of guide portions 9 of finishing portion on the plug 2 to repair enlarging, the guide portion 9 that has lost the circle distortion in the welding process is repaired.Then, utilize the inwall of the 6 pairs of guide portions 9 of indent portion on the plug 2 to carry out the indent processing, utilize the taper face of weld 8 of the 5 pairs of copper pipes 3 of expansion mouth on the plug 2 and the inwall position of guide portion 9 to carry out enlarging at last, extract the welding that plug 2 is finished copper pipe and aluminum pipe out.
Specific embodiment two:
According to the requirement of pipeline Design of length, choose identical copper pipe of external diameter of pipe and aluminum pipe and carry out preliminary working, obtain short copper pipe 3 and aluminum pipe 12.At first the welding part with copper pipe 3 pipe ends is processed into the undergauge shape that front end has guide portion 9, the destruction of 9 pairs of aluminum pipes of guide portion when alleviating crooked joint, need slot at guide portion, guide portion 9 inwalls are evenly prefabricated, and 4 degree of depth are split groove 13, to increase the stress concentration factor at this position.In addition, fluting also can be drawn or be cut, thereby runs through the guide portion tube wall.All the other welding step are identical with embodiment 1.
The present invention describes with reference to drawings and Examples, but protection domain is not limited thereto, and has those of ordinary skill and can pass through simple conversion in the technology of the present invention scope, and obtain the same technique effect of the present invention, equally in protection scope of the present invention.
Claims (9)
1. a resistant to bending copper-aluminium tube joint is characterized in that there are straight tube-like guide portion and taper face of weld in the welded joint position of copper pipe, and guide portion length surpasses aluminum pipe pyroplastic deformability zone, and the internal surface of guide portion is distributed with vertically and splits groove.
2. a resistant to bending copper-aluminium tube joint as claimed in claim 1 is characterized in that described splitting has at least one to run through described copper pipe guide portion tube wall in the groove.
3. a resistant to bending copper-aluminium tube joint as claimed in claim 1 or 2 is characterized in that described copper pipe is a copper tube, and described aluminum pipe is pure aluminum tube or antirust aluminum pipe.
4. resistant to bending copper-aluminium tube joint as claimed in claim 1 or 2 is characterized in that: form direct chemical bond between described taper face of weld and the aluminum pipe inwall and be connected.
5. method for preparing the described resistant to bending copper-aluminium tube joint of claim 1, it is characterized in that getting the identical copper pipe of external diameter, each one of aluminum pipe, copper pipe one end is done the processing of closing up, plug is put into copper pipe and be connected on the end thrust connecting rod of welding machine, the copper pipe that will have plug is placed in the traveling electrode, with the fixing copper pipe of high pressure cylinder, aluminum pipe is placed in the fixed electrode and with the fixing aluminum pipe of cylinder, on the welding position of fixed electrode aluminum pipe, mosaic block is installed, mosaic block cavity shape and aluminum pipe profile match, during welding the aluminum pipe end is flushed with the mosaic block edge, the pushing tow cylinder will have the traveling electrode of copper pipe and push aluminum pipe to, switch on simultaneously resistance heating is carried out in copper aluminium bond zone, copper pipe is constantly inner mobile to aluminum pipe under the effect of pushing tow cylinder, in moving process, the propelling pressure of copper pipe and welding current are adjusted electric current automatically, voltage, air pressure, after the outage, plug is pushed the aluminum pipe direction to along copper pipe fast under the promotion of welding equipment.
6. the method for the resistant to bending copper-aluminium tube joint of preparation as claimed in claim 5 is characterized in that carrying out indent to form the described groove that splits at the copper pipe guide portion before the welding.
7. method as claim 5 or the resistant to bending copper-aluminium tube joint of 6 described preparations is characterized in that the traveling electrode group that the pushing tow cylinder will have a copper pipe pushes aluminum pipe to, and pressure control is at 150kg～250kg.
8. the used special core rod of method of the resistant to bending copper-aluminium tube joint of preparation as claimed in claim 5 is characterized in that plug is multistage string style, and front end is the indent portion that pointed projections is arranged, and is the expansion mouth of annular collar type projection after the indent portion.
9. the used special core rod of method of the resistant to bending copper-aluminium tube joint of preparation according to claim 8 is characterized in that indent portion front end is provided with the finishing portion of annular collar type projection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101457565A CN101382216B (en) | 2007-09-05 | 2007-09-05 | Counter bending copper-aluminium tube joint, method for producing same and special core rod |
| PCT/CN2008/001389 WO2009030099A1 (en) | 2007-09-05 | 2008-07-29 | Bending resistance cu-al pipe connector, producing method thereof and special core bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101457565A CN101382216B (en) | 2007-09-05 | 2007-09-05 | Counter bending copper-aluminium tube joint, method for producing same and special core rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101382216A CN101382216A (en) | 2009-03-11 |
| CN101382216B true CN101382216B (en) | 2010-08-11 |
Family
ID=40428449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101457565A Active CN101382216B (en) | 2007-09-05 | 2007-09-05 | Counter bending copper-aluminium tube joint, method for producing same and special core rod |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101382216B (en) |
| WO (1) | WO2009030099A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343847B (en) * | 2013-07-09 | 2018-02-02 | 扬州红人实业有限公司 | Cu-AL pipe and its welding procedure |
| CN103363243B (en) * | 2013-08-07 | 2015-07-22 | 重庆望江工业有限公司 | Device for dressing candlestick inner pipe |
| CN107775167A (en) * | 2016-08-24 | 2018-03-09 | 浙江康盛股份有限公司 | A kind of Cu-AL pipe thermal resistance composite connecting method |
| CN106425067A (en) * | 2016-10-14 | 2017-02-22 | 合肥太通制冷科技有限公司 | Resistance butt welding machine die provided with core rod |
| JP6928804B2 (en) * | 2018-09-14 | 2021-09-01 | 奥村金属株式会社 | Joining body of copper pipe and aluminum pipe and its joining method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5549335A (en) * | 1994-04-06 | 1996-08-27 | Peerless Of America, Incorporated | Solderless metallurgical joint |
| CN1676980A (en) * | 2005-02-24 | 2005-10-05 | 左铁军 | Copper-aluminium combined pipeline for refrigerating system and its preparing method |
| CN1959171A (en) * | 2006-09-20 | 2007-05-09 | 左铁军 | Welded joint of thin wall copper aluminum pipe with no eutectic structure, and preparation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2085350C1 (en) * | 1995-06-20 | 1997-07-27 | Научно-исследовательский и конструкторский институт энерготехники | Adapter for welding stainless steel pipes with zirconium alloy pipes |
-
2007
- 2007-09-05 CN CN2007101457565A patent/CN101382216B/en active Active
-
2008
- 2008-07-29 WO PCT/CN2008/001389 patent/WO2009030099A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5549335A (en) * | 1994-04-06 | 1996-08-27 | Peerless Of America, Incorporated | Solderless metallurgical joint |
| CN1676980A (en) * | 2005-02-24 | 2005-10-05 | 左铁军 | Copper-aluminium combined pipeline for refrigerating system and its preparing method |
| CN1959171A (en) * | 2006-09-20 | 2007-05-09 | 左铁军 | Welded joint of thin wall copper aluminum pipe with no eutectic structure, and preparation method |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平9-85467A 1997.03.31 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101382216A (en) | 2009-03-11 |
| WO2009030099A1 (en) | 2009-03-12 |
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Assignee: Qingdao Haiqing Mechanism Plant Assignor: Zuo Tiejun|Zhao Yue Contract record no.: 2011370000153 Denomination of invention: Counter bending copper-aluminium tube joint, method for producing same and special core rod Granted publication date: 20100811 License type: Exclusive License Open date: 20090311 Record date: 20110428 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20240401 Address after: North Mengzhuang road 266021 Shandong city of Qingdao Province, No. 17 Patentee after: Qingdao Hai Qing Machinery Co.,Ltd. Country or region after: China Address before: North Mengzhuang road 266021 Shandong city of Qingdao Province, No. 17 Patentee before: Zuo Tiejun Country or region before: China Patentee before: Zhao Yue |