CN1491771A - Non-protective bottoming welding technology with solid core welding wire for back of staniless steel pipe - Google Patents
Non-protective bottoming welding technology with solid core welding wire for back of staniless steel pipe Download PDFInfo
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- CN1491771A CN1491771A CNA031544800A CN03154480A CN1491771A CN 1491771 A CN1491771 A CN 1491771A CN A031544800 A CNA031544800 A CN A031544800A CN 03154480 A CN03154480 A CN 03154480A CN 1491771 A CN1491771 A CN 1491771A
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- 238000003466 welding Methods 0.000 title claims abstract description 105
- 239000007787 solid Substances 0.000 title claims abstract description 14
- 238000005516 engineering process Methods 0.000 title claims description 9
- 229910000831 Steel Inorganic materials 0.000 title description 2
- 239000010959 steel Substances 0.000 title description 2
- 229910052786 argon Inorganic materials 0.000 claims abstract description 35
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 28
- 239000010935 stainless steel Substances 0.000 claims abstract description 28
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 68
- 239000007789 gas Substances 0.000 claims description 50
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 16
- 239000001307 helium Substances 0.000 claims description 9
- 229910052734 helium Inorganic materials 0.000 claims description 9
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 8
- 239000001569 carbon dioxide Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 2
- 239000003814 drug Substances 0.000 abstract description 2
- 238000011065 in-situ storage Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000003208 petroleum Substances 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 15
- 238000005260 corrosion Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 239000002893 slag Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000035515 penetration Effects 0.000 description 6
- 238000010891 electric arc Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003913 materials processing Methods 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
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Arc Welding In General (AREA)
Abstract
The present invention belongs to the field of welding in material processing engineering, and is used mainly in welding austenic stainless steel in petroleum, chemical, medicine, ship building, food production and other fields. The present invention features that the solid core welding wire ER308L-Si or ER316L-Si is matched with the mixed gas of He 85-94 vol%, Ar 5-10 vol% and CO2 1-5 vol% for the bottoming welding. The present invention needs no back side protecting gas and this simplifies the preparation, lowers the cost and raises the production efficiency. The present invention is especially suitable for welding construction of large and long stainless steel, and in-situ overhead welding operation.
Description
Technical field
The invention belongs to the welding field of Materials Processing Engineering, be mainly used in the welding of the austenitic stainless steel in fields such as oil, chemical industry, medicine, shipbuilding, food.
Background technology
The welding of stainless steel tube is made up of backing welding, filling weldering and cosmetic welding three parts usually, and wherein backing welding is a ring of most critical in the stainless steel pipes welding, and its back of weld problem of oxidation is difficult to satisfactory solution always.Stainless steel bottoming at present is divided into mainly that protective gas is filled at the back side and two kinds of protective gas are not filled at the back side.
1, the argon tungsten-arc welding that protective gas mainly is solid welding wire (rod) is filled at the back side
This is to use at most at present, and most widely used stainless steel tube solder technology is suitable for caliber 20～500mm, the stainless steel tube welding of wall thickness more than 3mm.
But back side applying argon gas, nitrogen, nitrogen hydrogen mixeding gas etc. are protected.The method of inflation has a variety of, but certain limitation is all arranged.
Preparation is more before this welding procedure weldering; when applying argon gas, nitrogen protection owing to do not have deoxidation or a dehydrogenation effect; oil removing before the butt welding, preparation such as derust, anhydrate require tighter; therefore, labor productivity is lower, and the amount of labour is bigger; complex process; the welding cost height, during the construction of high-altitude, long-distance pipe, back side argon filling almost is impossible especially at the scene.
2, not fill the welding method of the gas of protection mainly be the argon tungsten-arc welding of flux-cored wire (rod) at the back side.
Flux-cored wire (rod) argon arc welding bottoming was at first used by Japan in the eighties.Fixing port welding when this welding method mainly solves on-the-spot the installation.Its principle is to utilize the mechanism of slag gas shiled in the flux-cored wire (rod), and the slag that melts during welding can flow in the pipe and evenly cover sealing run, thereby has protected sealing run not oxidated.The postwelding slag can come off voluntarily, and water or compressed air can fall inner slag erosion.
The body protection need not inflated in stainless steel tube inside when the outstanding advantage of this welding method was welding, thereby had simplified welding procedure greatly, had reduced welding cost.But because the intrinsic characteristic of flux-cored wire itself, this welding method also exists certain defective: one, because the flux-cored wire burn-off rate is fast, the welder needs rapidly and accurately welding wire to be delivered to the tram, thereby requires welder's operant level to want high; Can produce slag when two, feeling secure, not have solid core welding wire clear when the welder observes the molten bath, be difficult for judging back side penetration situation with flux-cored wire.Three, owing to be medicinal powder in the middle of the flux-cored wire, skin is a sheetmetal, and electric arc is around the sheetmetal burning during welding, and the migration that easily produces electric arc causes the electric arc swing, influences the fusion of stainless steel tube both sides.
In addition, because this method produces slag at back of weld, and be not suitable for the welding of pure pipeline (as the food service industry stainless steel pipes).
Summary of the invention
The present invention adopts the stainless steel solid core welding wire to cooperate multi component mixed gas body (He+Ar+CO
2) stainless steel pipes is felt secure; the back side need not gas shield; break through the argon tungsten-arc welding bottoming technology and the back side of traditional back side argon-filled protection and do not protected the essential mechanism that adopts slag gas Combined Protection; the molten bath as seen; do not have slag to cover, stainless steel pipes backing welding connection technology level is stepped a stage.
The present invention compares with back side argon filling argon tungsten-arc welding, and the back side need not protective gas, can reduce weldering preceding preparation and the required expense of argon filling, thereby can enhance productivity, and reduces production costs.Because of the back side need not protective gas, be particularly useful for big diameter stainless steel pipe road, long welding procedure apart from stainless steel pipes, on-the-spot work high above the ground etc.
The present invention compares with the flux-cored wire argon tungsten-arc welding, on the one hand, and molten bath visibility height, the welder can clearly observe the flow regime in molten bath and judge back of weld penetration situation, thereby can be easier to control appearance of weld, therefore, less demanding to welder's technical merit.On the other hand, owing to adopt solid core welding wire, postwelding need not scarfing cinder, can reduce the cleaning work of postwelding, is particularly useful for the welding of the pure pipeline of austenitic stainless steel.
Through domestic and international patent is retrieved, not seeing has relevant patent report.
The present invention adopts solid core welding wire ER308L-Si and ER316L-Si to cooperate multi component mixed gas body (He+Ar+CO
2) be used for the bottoming welding in A304, A304L, A316, A316L Austenitic stainless steel pipe road.
The invention provides a kind of stainless steel tube back side unprotect solid core welding wire backing welding connection technology, it is characterized in that, adopt solid core welding wire ER308L-Si or ER316L-Si to cooperate proportioning to be: the volumn concentration of helium is 85～94%; The volumn concentration of argon gas is 5～10%; The volumn concentration of carbon dioxide is 1%～5% multi component mixed gas body (He+Ar+CO
2) carry out the bottoming welding of stainless steel pipes according to the welding variables of routine.
The diameter of solid core welding wire ER308L-Si and ER316L-Si is respectively 2mm, 2.4mm.
Diameter is the welding wire of 2mm, and its welding variables is as follows:
Welding current: 80A～130A weldingvoltage: 10V～16V gas flow: 10～20L/min
Diameter is the welding wire of 2.4mm, and its welding variables is as follows:
Welding current: 90A～150A weldingvoltage: 12V～18V gas flow: 10～20L/min
Solid core welding wire ER308L-Si and ER316L-Si are the Silicon-rich welding wire.Silicone content improves, and can increase the flowability of weld metal on the one hand, helps the effusion of gas; On the other hand, in welding process, the silicon of back of weld is preferential and airborne oxygen combination when high temperature, has played the effect of protection sealing run metal, helps preventing the back of weld oxidation.
The effect of multi component mixed gas body and percent by volume are:
He: monatomic inert gas, thermal conductivity factor is big, and its biggest advantage is an electric arc when burning in He gas, and arc temperature height, arc voltage are also higher, and therefore, the input of mother metal heat is bigger, thereby can improve weld penetration.Add helium in the multi component mixed gas body, can improve speed of welding, be about twice, thereby can reduce the high-temperature residence time of sealing run metal, help preventing the sealing run oxidation in argon tungsten-arc welding.Its volumn concentration is: 85～94%.
Ar: monatomic inert gas, thermal conductivity factor is very little, is difficult for dividing heat of desorption during high temperature.Therefore arc burning is highly stable in the argon gas, and thermal loss is also less.When making protection gas, be difficult for floating scattering and disappearing, can prevent airborne oxygen intrusion with argon gas.In addition, add argon gas in the mist, also can reduce and splash.Its volumn concentration is: 5～10%.
The He+Ar mist can improve weld penetration, minimizing pore and boost productivity.
CO
2: oxidizing gas adds CO in the mist
2Gas can strengthen on the one hand the penetration power of electric arc, increases fusion penetration, improves the melting efficiency of welding wire, can overcome problems such as negative electrode drift phenomenon and appearance of weld be bad on the one hand again.Its volumn concentration is 1%～5%.
The specific embodiment
Mother metal adopts A304L, and its chemical composition is as shown in table 1.Bevel for welding and button are chosen according to GB4334.5-90.
The ER308L welding wire is used in the argon tungsten-arc welding of back side argon-filled protection (Comparative Examples), and diameter is 2mm, and its concrete welding condition is as follows: welding current: 120A～130A weldingvoltage: 9V～16V gas flow 8L/min～15L/min
The argon tungsten-arc welding (Comparative Examples) of choosing example of the present invention and back side argon filling compares, and the specific embodiment is as follows:
Welding equipment adopts the weldering of the tungsten electrode argon utmost point, and its model is: KEMPPI TU50.Welding wire uses ER308L-Si, and gage of wire is 2.0mm.The electric current kind is straight polarity direct current.
Embodiment 1: mixed gases matching is: the helium percent by volume is 85%; The argon gas percent by volume is 10%, and the carbon dioxide percent by volume is 5%, welds according to following welding condition:
Welding current: 100A～120A weldingvoltage: 15V～16V gas flow: 12～15L/min
Embodiment 2: mixed gases matching is: the helium percent by volume is 90%; The argon gas percent by volume is 7%, and the carbon dioxide percent by volume is 3%, welds according to following welding condition:
Welding current: 100A～120A weldingvoltage: 15V～16V gas flow: 12～15L/min
Embodiment 3: mixed gases matching is: the helium percent by volume is 94%; The argon gas percent by volume is 5%, and the carbon dioxide percent by volume is 1%, welds according to following welding condition:
Welding current: 100A～120A weldingvoltage: 15V～16V gas flow: 12～15L/min
Mother metal adopts A316L, and its chemical composition is as shown in table 1.Bevel for welding and button are chosen according to GB4334.5-90.
The ER316L welding wire is used in the argon tungsten-arc welding of back side argon-filled protection (Comparative Examples), and gage of wire is 2.4mm.Its concrete technological parameter is: welding current: 120A～130A weldingvoltage 8V～10V gas flow 10L/min～15L/min
The argon tungsten-arc welding (Comparative Examples) of choosing example of the present invention and back side argon filling compares, and the specific embodiment is as follows:
Welding equipment adopts the weldering of the tungsten electrode argon utmost point, and its model is: KEMPPI TU50.Welding wire uses ER316L-Si, and gage of wire is 2.4mm.
Embodiment 4: mixed gases matching is: the helium percent by volume is 85%; Argon gas percentage is 10%, and the carbon dioxide percent by volume is 5%, welds according to following welding condition:
Welding current: 120A～130A weldingvoltage: 16V～17V gas flow: 12～15L/min.
Embodiment 5: selecting diameter for use is the welding wire of 2.0mm, and mixed gases matching is: the helium percent by volume is 89%; Argon gas percentage is 8%, and the carbon dioxide percent by volume is 3%, welds according to following welding condition: welding current: 120A～130A weldingvoltage: 16V～17V gas flow: 12～15L/min.
Embodiment 6: selecting diameter for use is the welding wire of 2.0mm, and mixed gases matching is: the helium percent by volume is 94%; Argon gas percentage is 5%, and the carbon dioxide percent by volume is 1%, welds according to following welding condition: welding current: 120A～130A weldingvoltage: 16V～17V gas flow: 12～15L/min.
Postwelding carries out the test of mechanical property, corrosive nature.The Mechanics Performance Testing of A304L stainless steel welded joint the results are shown in Table 2.The Mechanics Performance Testing of A316L stainless steel weld joint the results are shown in Table 3.The intercrystalline corrosion performance is tested according to GB4334.5-90.A304L stainless steel welded joint intercrystalline corrosion The performance test results sees Table 4.A316L stainless steel welded joint intercrystalline corrosion test result sees Table 5.From above-mentioned result of the test as can be seen, the performance of welding point meets the pertinent regulations of AWS (American National Standard), GB (CNS) fully.
Adopt the present invention, technology is simple, the production efficiency height, and welding technological properties is good.
The stainless chemical composition of table 1 A304L and A316L
| Grade of steel | C | Si | Mn | S | P | Cr | Ni | Mo | N |
| ?A304L | ≤0.03 | ≤1.00 | ≤2.00 | ≤ 0.030 | ≤ 0.035 | 17.00～ 19.00 | 8.00～ 12.00 | - | - |
| ?A316L | ≤0.03 | ≤1.00 | ≤2.00 | ≤ 0.030 | ≤ 0.035 | 16.00～ 18.00 | 12.00～ 16.00 | 1.80～ 2.50 | 0.15～ 0.25 |
The Mechanics Performance Testing of table 2 A304L stainless steel plumb joint
| Welding method | Bend test | Tensile strength (MPa) | Charpy impact value (J) | Vickers hardness | The mother metal crystallite dimension | The welding heat affected zone crystallite dimension |
| Comparative Examples | Meet national standard | 570 | ?142J-46℃ | 207HV | 5 grades | 4 grades |
| Embodiment 1 | Meet national standard | 564 | ?156J-46℃ | 209HV | 4 grades | 4 grades |
| Embodiment 2 | Meet national standard | 568 | ?154J-46℃ | 208HV | 4 grades | 4 grades |
| Embodiment 3 | Meet national standard | 566 | ?157J-46℃ | 209HV | 4 grades | 4 grades |
The Mechanics Performance Testing of table 3 A316L stainless steel welded joint
| Welding method | Bend test | Tensile strength (MPa) | Charpy impact value (J) | Vickers hardness | The mother metal crystallite dimension | The HAZ crystallite dimension |
| Comparative Examples | Meet national standard | 524 | ?126J-46℃ | ?212HV | 4 grades | 3～4 grades |
| Embodiment 4 | Meet national standard | 527 | ?128J-46℃ | ?212HV | 4 grades | 4 grades |
| Embodiment 5 | Meet national standard | 525 | ?126J-46℃ | ?210HV | 4 grades | 4 grades |
| Embodiment 6 | Meet national standard | 528 | ?128J-46℃ | ?214HV | 4 grades | 4 grades |
The intercrystalline corrosion of table 4 A304L stainless steel welded joint
| Comparative Examples | Embodiment 1 | Embodiment 2 | Embodiment 3 | |
| The intercrystalline corrosion situation | No intercrystalline corrosion | No intercrystalline corrosion | No intercrystalline corrosion | No intercrystalline corrosion |
The intercrystalline corrosion of table 5 A316L stainless steel welded joint
| Comparative Examples | Embodiment 4 | Embodiment 5 | Embodiment 6 | |
| The intercrystalline corrosion situation | No intercrystalline corrosion | No intercrystalline corrosion | No intercrystalline corrosion | No intercrystalline corrosion |
Claims (1)
1, a kind of stainless steel tube back side unprotect solid core welding wire backing welding connection technology is characterized in that, adopt solid core welding wire ER308L-Si or ER316L-Si to cooperate proportioning to be: the volumn concentration of helium is 85～94%; The volumn concentration of argon gas is 5～10%; The volumn concentration of carbon dioxide is 1%～5% multi component mixed gas body (He+Ar+CO
2), carry out the bottoming welding of stainless steel pipes according to the welding variables of routine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03154480 CN1272139C (en) | 2003-09-30 | 2003-09-30 | Non-protective bottoming welding technology with solid core welding wire for back of staniless steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03154480 CN1272139C (en) | 2003-09-30 | 2003-09-30 | Non-protective bottoming welding technology with solid core welding wire for back of staniless steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1491771A true CN1491771A (en) | 2004-04-28 |
| CN1272139C CN1272139C (en) | 2006-08-30 |
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|---|---|---|---|
| CN 03154480 Expired - Fee Related CN1272139C (en) | 2003-09-30 | 2003-09-30 | Non-protective bottoming welding technology with solid core welding wire for back of staniless steel pipe |
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| CN (1) | CN1272139C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100484688C (en) * | 2006-11-29 | 2009-05-06 | 中国科学院金属研究所 | Tungsten electrode inert gas-shielded welding technique |
| CN102114566A (en) * | 2011-01-06 | 2011-07-06 | 安徽桑铌科技股份有限公司 | Backing welding method of Cr-Mo heat-resistant steel pipelines without protective solid welding wires on back |
| CN102211243A (en) * | 2010-04-09 | 2011-10-12 | 株式会社东芝 | Shielding gas for MAG welding, MAG welding method, and welded structure |
| CN103517781A (en) * | 2011-05-11 | 2014-01-15 | 乔治洛德方法研究和开发液化空气有限公司 | MIG/MAG welding of stainless steels with rotary arc and Ar/He/CO2 gaseous mixture |
| CN112059471A (en) * | 2020-09-09 | 2020-12-11 | 郑州大学 | Flux-cored wire for welding 022 austenitic stainless steel seamless pipe for fluid transportation |
| CN112171016A (en) * | 2020-10-12 | 2021-01-05 | 中海福陆重工有限公司 | Austenitic stainless steel NBG welding process |
-
2003
- 2003-09-30 CN CN 03154480 patent/CN1272139C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100484688C (en) * | 2006-11-29 | 2009-05-06 | 中国科学院金属研究所 | Tungsten electrode inert gas-shielded welding technique |
| CN102211243A (en) * | 2010-04-09 | 2011-10-12 | 株式会社东芝 | Shielding gas for MAG welding, MAG welding method, and welded structure |
| CN102114566A (en) * | 2011-01-06 | 2011-07-06 | 安徽桑铌科技股份有限公司 | Backing welding method of Cr-Mo heat-resistant steel pipelines without protective solid welding wires on back |
| CN103517781A (en) * | 2011-05-11 | 2014-01-15 | 乔治洛德方法研究和开发液化空气有限公司 | MIG/MAG welding of stainless steels with rotary arc and Ar/He/CO2 gaseous mixture |
| CN112059471A (en) * | 2020-09-09 | 2020-12-11 | 郑州大学 | Flux-cored wire for welding 022 austenitic stainless steel seamless pipe for fluid transportation |
| CN112171016A (en) * | 2020-10-12 | 2021-01-05 | 中海福陆重工有限公司 | Austenitic stainless steel NBG welding process |
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| Publication number | Publication date |
|---|---|
| CN1272139C (en) | 2006-08-30 |
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Assignee: Anhui Sunny Technology Co., Ltd. Assignor: Beijing University of Technology Contract fulfillment period: 2009.8.20 to 2014.8.19 contract change Contract record no.: 2009340000210 Denomination of invention: Non-protective bottoming welding technology with solid core welding wire for back of staniless steel pipe Granted publication date: 20060830 License type: Exclusive license Record date: 2009.8.25 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.8.20 TO 2014.8.19; CHANGE OF CONTRACT Name of requester: ANHUI SUNNY TECHNOLOGY CO., LTD. Effective date: 20090825 |
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Granted publication date: 20060830 Termination date: 20110930 |