CN103785942B - A kind of Aluminum Alloy Friction Stir Welding defect-restoration method therefor - Google Patents
A kind of Aluminum Alloy Friction Stir Welding defect-restoration method therefor Download PDFInfo
- Publication number
- CN103785942B CN103785942B CN201410040662.1A CN201410040662A CN103785942B CN 103785942 B CN103785942 B CN 103785942B CN 201410040662 A CN201410040662 A CN 201410040662A CN 103785942 B CN103785942 B CN 103785942B
- Authority
- CN
- China
- Prior art keywords
- mixing needle
- weld seam
- welding
- fsw
- weld
- 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.)
- Expired - Fee Related
Links
- 238000003466 welding Methods 0.000 title claims abstract description 40
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000003756 stirring Methods 0.000 title claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000003801 milling Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims description 13
- 239000011324 bead Substances 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 230000008439 repair process Effects 0.000 abstract description 3
- 230000007812 deficiency Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 240000004859 Gamochaeta purpurea Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003836 solid-state method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1225—Particular aspects of welding with a non-consumable tool
-
- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
Abstract
A kind of Aluminum Alloy Friction Stir Welding defect-restoration method therefor, adopt under spring scale and hang magnet piece method, that determines to judge mixing needle in aluminum alloy stirring friction welding seam buries position, and by adopting Pneumatic milling cutter, and coordinate electric hand drill, nipper plier, the mixing needle fractureed is taken out from weld seam.Non-melt pole inert gas-shielded arc welding (MIG weldering) is adopted to cause material deficiency to fill to taking place again.Friction stir welding method is finally adopted to carry out final REPAIR WELDING to problem weld seam.The present invention is simple to operate, be easy to realize, and economy is high, practical, and practical engineering application meaning is remarkable.
Description
Technical field
The invention belongs to rail vehicle processing and manufacturing field, especially relate to the restorative procedure of the defect that mixing needle causes after fractureing in a kind of Aluminum Alloy Friction Stir Welding technique.
Background technology
Along with the fast development of rail vehicle processing and manufacturing industry, particularly under the overall background of global energy crisis, light-weight design becomes main flow.Due to aluminum alloy materials have that density is low, specific strength is high, easy-formation, excellent physical characteristic and the mechanical property such as corrosion-resistant, now widespread adoption in the car body processing and manufacturing of rail vehicle.In current aluminum alloy bodywork manufactures, welding method is mainly based on welding (MetalInert-gasWelding, MIG).But due to aluminium alloy in atmosphere and welding time be very easily oxidized to that fusing point is high, stability is strong, the easily moisture absorption and the aluminium oxide not easily removed, hinder the carrying out of welding, and aluminium alloy easily generates pore, is mingled with in welding process in welding point, incomplete fusion and the defect such as lack of penetration.In addition, it is large that aluminium alloy melts arc-welding deflection, and when particularly carrying out thick plates, problem is more outstanding.
Agitating friction technology (FrictionStirWelding, FSW) is the material solid state method of attachment of Britain's institute of welding (TheWeldingInstitute, TWI) a kind of advanced person of invention in 1991.The advantages such as this technology has that heat input is low, quality of weld joint is high, welding deformation is little, environmental protection insensitive to humiture, are particularly suitable for the welding of aluminum alloy materials.Therefore, FSW technology, once appearance, had both obtained the extensive concern of experts and scholars, and the remarkable technical economic benefit possessed due to this technology, FSW technology is in Aeronautics and Astronautics, shipbuilding, automobile making up to now, and rail vehicle processing and manufacturing aspect is widely applied.
Although utilize friction stir welding method to carry out welding point that Welded can obtain high-quality, high stability, but in engineering practical operation, for reducing costs, at utmost playing the service life of single stirring-head in situation, normal appearance because of the excessive use of stirring-head, cause its physical dimension and surface appearance impaired and problem weld seam is occurred.Usually, stirring-head is primarily of clamp area, the shaft shoulder and mixing needle three part composition.In stir friction welding process, the stirring-head shaft shoulder while as major heat source, also plays to plastic zone metal that bag holds together, squeezing action, and then ensures the shaping of weld metal.The dominant failure failure mode at this position is based on surface abrasion.This problem judges by observation stirring-head shoulder face situation and institute's welding line shaping surface, and therefore, this type of damaged form of stirring-head is more easily grasped, and the problem weld seam caused thus is also more easily avoided.Another serious damage form of stirring-head is then that in FSW welding process, its front end penetrates snapping of inside workpiece mixing needle.Because the mixing needle part of stirring-head rubs except producing with weld seam interior metal in welding process, while part origin of heat is provided, also play realize plastic property of weld bead material mechanical agitation, make material flow more reasonably act on, in whole process, the external form of mixing needle and size are while taking up wear shortens, and also bear larger moment of torsion.From analysis, no matter penetrating stage or stable welding stage, the weak part that brittle fracture easily occurs stirring-head is mixing needle root.And along with the increase of material thickness to be welded, the shearing force of bearing increases, and correspondingly increases the probability that mixing needle fractures.In the case, as continued welding, the mixing needle not only fractureed is buried in weld seam inside, and weld seam formed thereafter also will exist serious quality problems.
And in FSW welding process, even if the front end mixing needle of stirring-head snaps, agitating friction welding still can proceed, and surface of the work to be welded still can valid shaping.Thus add the discovery difficulty that the problem that fractures of mixing needle in above-mentioned FSW process occurs, and after welding of being everlasting terminates, during the situation of observation stirring-head, just the mixing needle part of discovery stirring-head fractures.Now, need judge that mixing needle is buried in the position in weld seam exactly, and then could effectively repair problem weld seam.
Summary of the invention
The front end mixing needle part that the object of the invention is for stirring-head in Aluminum Alloy Friction Stir Welding process fractures extremely, and be buried in weld seam internal problem because failing the mixing needle that Timeliness coverage makes to fracture, propose a kind ofly accurately to determine the mixing needle position that fractures be buried in weld seam, and make corresponding solution for this problem.
For achieving the above object, the invention provides a kind of Aluminum Alloy Friction Stir Welding defect-restoration method therefor, it is characterized in that comprising the following steps:
1, spring scale lower end being hung magnet piece is placed in face of weld, makes magnet lower surface and aluminium alloy FSW face of weld distance controlling between 5mm to 10mm;
2, spring scale is moved forward with the speed of 30-40mm per minute along bead direction;
3, in traveling process, there is spring scale reading and increase suddenly, then tentatively judge to bury position herein as the inner mixing needle that fractures of weld seam;
4, repeat 1-3 step, leapfrog test is carried out in the position of burying of the inner mixing needle that fractures of butt welded seam, and that finally determines mixing needle specifically buries position;
5, determine mixing needle specifically bury position after, scratch with Pneumatic milling cutter and grind the mixing needle that fractures that is retained in FSW weld seam, coordinate electric hand drill, nipper plier afterwards, the mixing needle fractureed is taken out from weld seam;
6, along bead direction, mixing needle is taken place with Pneumatic milling cutter and cut open mill, this place is formed progressively to the ship shape groove of face of weld even transition, then adopt MIG weldering to carry out material filling, with pneumatic angular grinding wheel, MIG welding line is polished afterwards;
7, change and after damaged stirring-head same model instrument, FSW reparation carried out to problem weld seam.
The present invention has following beneficial effect:
1. the present invention exploitation propose be suitable for aluminium alloy FSW weld time, mixing needle fractures and is buried in weld seam inside, and bring therefrom leave over mixing needle search, take and problem weld seam repair new method;
2. the present invention is simple to operate, and economy is high, practical.
Accompanying drawing explanation
Fig. 1 is that aluminium alloy FSW welds stirring-head and penetrates schematic diagram before workpiece to be welded;
Fig. 2 is aluminium alloy FSW welding process schematic diagram;
Fig. 3 is that aluminium alloy FSW welds and terminates lift-off on end stirring-head and to go into operation part schematic surface;
Fig. 4 is that the mixing needle that fractures in aluminium alloy FSW weld seam leaves over search schematic diagram.
Detailed description of the invention
Composition graphs 1, Fig. 2, Fig. 3 and Fig. 4, Al alloy parts 2 to be welded and Al alloy parts 3 are all 6082 aluminium alloy plates (condition of heat treatment is T6) of 12mm thickness of slab, first the surface and oil contaminant of workpiece 2 to be welded and workpiece 3 is removed by wipes of alcohol, remove the oxide-film of workpiece 2 and workpiece 3 upper surface, side again with wire brush, realize the good assembly between workpiece 2 and workpiece 3 afterwards.Stirring-head 1 used is made up of clamp area 1-1, shaft shoulder 1-2 and mixing needle 1-3.Setting stirring-head 1 axially becomes 2.5 ° of top rakes with Al alloy parts 2 to be welded with workpiece 3 surface normal direction.Start agitating friction welding equipment, make stirring-head 1 reach setting speed 450rpm.Stirring-head 1 penetrates with 0.3mm/s speed and treats welding line 4 between Al alloy parts 2 to be welded and workpiece 3, until the shaft shoulder 1-2 of stirring-head 1 is pressed between workpiece 2 and the surperficial 0.1mm to 0.2mm of workpiece 3, after stopping 5s afterwards, along treating that welding line 4 welds speed with 150mm/min and welds.In FSW welding process, the shaft shoulder 1-2 part of stirring-head 1 and Al alloy parts 2 to be welded and workpiece 3 close contact, the mixing needle 1-3 of stirring-head 1 penetrates and buries in Al alloy parts 2 to be welded and workpiece 3 inside, finally forms FSW weld seam 5 at stirring-head 1 rear.At the end of FSW welding, stirring-head 1 upwards promotes, and leave Al alloy parts 2 to be welded and workpiece 3 surface, now observe the mixing needle 1-3 part of stirring-head 1, discovery mixing needle breakage fractures.Bracket for Inspection 6 shown in Fig. 4 is positioned over FSW weld seam 5 upper end, and passes through the angle adjustment of the pole 6-2 of Bracket for Inspection, magnet piece 8 lower surface that spring scale 7 front end is hung and FSW weld seam 5 distance between the surface control within the scope of 5-10mm.Manually with the spring scale 7 of the speed of 30-40mm per minute along hanging on the feed rod 6-1 of FSW weld seam 5 center line forward Bracket for Inspection 6; In spring scale 7 moving process, find that magnet piece 8 is attracted downwards, spring scale 7 reading increases suddenly, then judge that the position of FSW weld seam 5 is herein that mixing needle fractures and buries position.
Determine in FSW weld seam 5 the mixing needle 1-3 that fractures bury position after, when taking the mixing needle 1-3 fractureed, mill size is cutd open for reducing, scratch with Pneumatic milling cutter and grind the mixing needle 1-3 that determines and bury position, after exposing the mixing needle 1-3 that fractures be retained in FSW weld seam 5, coordinate hand drill, nipper plier again, the mixing needle 1-3 fractureed is taken out from FSW weld seam 5.In order to ensure that quality is filled up in MIG weldering, before weld filler, along bead direction, mixing needle is taken place with Pneumatic milling cutter and cut open mill, this place is formed progressively to the ship shape groove of face of weld even transition, adopt MIG to weld afterwards again and carry out material filling, finally adopt pneumatic angular grinding wheel MIG to be welded reinforcement weld seam and polish.After this, FSW welding is carried out again with the stirring-head 1 pair of FSW weld seam 5 after renewal.
Claims (1)
1. an Aluminum Alloy Friction Stir Welding defect-restoration method therefor, is characterized in that comprising the following steps:
(1) spring scale lower end being hung magnet piece is placed in face of weld, makes magnet lower surface and aluminium alloy FSW face of weld distance controlling between 5mm to 10mm;
(2) spring scale is moved forward with the speed of 30-40mm per minute along bead direction;
(3) in traveling process, there is spring scale reading and increase suddenly, then tentatively judge to bury position herein as the inner mixing needle that fractures of weld seam;
(4) repeat 1-3 step, leapfrog test is carried out in the position of burying of the inner mixing needle that fractures of butt welded seam, and that finally determines mixing needle specifically buries position;
(5) determine mixing needle specifically bury position after, scratch with Pneumatic milling cutter and grind the mixing needle that fractures that is retained in FSW weld seam, coordinate electric hand drill, nipper plier afterwards, the mixing needle fractureed is taken out from weld seam;
(6) along bead direction, mixing needle is taken place with Pneumatic milling cutter and cut open mill, this place is formed progressively to the ship shape groove of face of weld even transition, then adopt MIG weldering to carry out material filling, with pneumatic angular grinding wheel, MIG welding line is polished afterwards;
(7) change and after damaged stirring-head same model instrument, FSW reparation carried out to problem weld seam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410040662.1A CN103785942B (en) | 2014-01-28 | 2014-01-28 | A kind of Aluminum Alloy Friction Stir Welding defect-restoration method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410040662.1A CN103785942B (en) | 2014-01-28 | 2014-01-28 | A kind of Aluminum Alloy Friction Stir Welding defect-restoration method therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103785942A CN103785942A (en) | 2014-05-14 |
| CN103785942B true CN103785942B (en) | 2016-01-27 |
Family
ID=50662225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410040662.1A Expired - Fee Related CN103785942B (en) | 2014-01-28 | 2014-01-28 | A kind of Aluminum Alloy Friction Stir Welding defect-restoration method therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103785942B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104014978B (en) * | 2014-06-05 | 2016-06-15 | 中国人民解放军装甲兵工程学院 | The built-up welding of a kind of magnesium alloy parts shapes reproducing method |
| CN104117749B (en) * | 2014-08-13 | 2016-03-02 | 成都四威高科技产业园有限公司 | A kind of rewelding method of aluminium alloy sealed welding seam |
| CN108527237B (en) * | 2017-03-06 | 2020-08-11 | 陕西飞机工业（集团）有限公司 | Friction stir welding broken pin extraction device and method |
| CN107695510B (en) * | 2017-10-30 | 2019-08-06 | 北京建筑大学 | A kind of vehicle wallboard restorative procedure based on friction rabbling welding |
| CN108788504A (en) * | 2018-07-05 | 2018-11-13 | 南京中车浦镇城轨车辆有限责任公司 | A kind of restorative procedure of large scale agitating friction weldering weld defect |
| CN114473180A (en) * | 2022-03-18 | 2022-05-13 | 江苏科技大学 | Alternating radial force adjustable stirring friction welding method for dissimilar metal connection |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101966621A (en) * | 2010-11-04 | 2011-02-09 | 哈尔滨工业大学 | Electric arc preheating repair welding method for stir friction plug |
| CN102500915A (en) * | 2011-11-08 | 2012-06-20 | 西安交通大学 | Method for filling friction stir welding keyhole by using T-shaped filling block and bitless stirring head |
| CN102581476A (en) * | 2012-03-28 | 2012-07-18 | 首都航天机械公司 | Device and method for repairing friction stir welding weld defect of storage tank for carrier rocket |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5685461B2 (en) * | 2011-03-18 | 2015-03-18 | 川崎重工業株式会社 | Hole repair method using friction stir spot welding |
-
2014
- 2014-01-28 CN CN201410040662.1A patent/CN103785942B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101966621A (en) * | 2010-11-04 | 2011-02-09 | 哈尔滨工业大学 | Electric arc preheating repair welding method for stir friction plug |
| CN102500915A (en) * | 2011-11-08 | 2012-06-20 | 西安交通大学 | Method for filling friction stir welding keyhole by using T-shaped filling block and bitless stirring head |
| CN102581476A (en) * | 2012-03-28 | 2012-07-18 | 首都航天机械公司 | Device and method for repairing friction stir welding weld defect of storage tank for carrier rocket |
Non-Patent Citations (1)
| Title |
|---|
| 2219铝合金搅拌摩擦焊缝匙孔形缺陷修补技术;王国庆等;《宇航材料工艺》;20120630(第3期);第24-28页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103785942A (en) | 2014-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103785942B (en) | A kind of Aluminum Alloy Friction Stir Welding defect-restoration method therefor | |
| CN101543926B (en) | Overlaying welding technology of ductile cast iron roller | |
| CN105226479B (en) | A kind of preparation method of tubular type conducting rod, hydraulic bulging device and tubular type conducting rod | |
| CN102248267A (en) | Thick-wall chromium-molybdenum steel pipeline submerged arc welding technology | |
| CN103480966A (en) | Austenite stainless steel lap-over laser welding method | |
| US9308686B2 (en) | Apparatus and process for joining homogeneous and heterogeneous materials with customized interface properties | |
| CN104588850A (en) | Welding technology for steel plates | |
| CN104259633A (en) | Efficient single-face submerged arc welding method | |
| CN106903401A (en) | Obliquity buried arc welding method | |
| CN102848057A (en) | Method for reworking welding seam of aluminum and aluminum alloy | |
| CN107009005A (en) | A kind of large-diameter pipe circumferential weld narrow-clearance submerged arc welding welding system | |
| Xu et al. | Improving hook characterization of friction stir lap welded Al alloy joint using a two-section stepped friction pin | |
| CN104439731A (en) | Steel-aluminum welding structure auxiliary seat and manufacturing method | |
| CN104588853A (en) | Electric arc welding process for 16Mn steel plate | |
| CN106808135A (en) | One kind fracture high-speed steel welding repair method | |
| CN102642079A (en) | Friction stir welding process for aluminum alloy side wall of rail transit vehicle | |
| CN211305187U (en) | Rotary welding tool for friction welding | |
| CN104607827A (en) | Method for preventing cracks in cast steel and steel welding process | |
| CN106334859B (en) | The method for welding high-iron carriage aluminium alloy floor using rush-harvesting and rush-planting A-MIG | |
| CN105108280A (en) | Welding method of high-molybdenum stainless steel plate | |
| CN101811217A (en) | Welding method of arc-shaped welding seam | |
| CN103111733A (en) | Welding method for high-weather resistance steel and stainless steel | |
| CN102672356B (en) | Hybrid welding method for train sleeper beam | |
| CN107052562A (en) | The method that friction welding (FW) produces aluminum steel transition welding block | |
| CN105171228A (en) | Welding technology method of motor train unit coupler seat assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160127 |