CN103521944B - A kind of stainless sheet steel laser weld packing material and preparation method thereof - Google Patents
A kind of stainless sheet steel laser weld packing material and preparation method thereof Download PDFInfo
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- CN103521944B CN103521944B CN201310449939.1A CN201310449939A CN103521944B CN 103521944 B CN103521944 B CN 103521944B CN 201310449939 A CN201310449939 A CN 201310449939A CN 103521944 B CN103521944 B CN 103521944B
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- sheet steel
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- 239000000463 material Substances 0.000 title claims abstract description 52
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000012856 packing Methods 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000011230 binding agent Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 14
- 238000005469 granulation Methods 0.000 claims abstract description 10
- 230000003179 granulation Effects 0.000 claims abstract description 10
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000010436 fluorite Substances 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 7
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 7
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 7
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 7
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 7
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 6
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 6
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 14
- 229910052751 metal Inorganic materials 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 9
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 8
- 239000010935 stainless steel Substances 0.000 abstract description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 210000003625 skull Anatomy 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000013589 supplement Substances 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention belongs to welding technology field, be specifically related to a kind of stainless sheet steel laser weld packing material and preparation method thereof.After this stainless sheet steel laser weld packing material is mixed with binding agent by powder body material again through granulation, sieve, bake gained, described powder body material comprises the component of following proportioning: chromic carbide iron 34-36%, rutile 15-18%, nickel powder 12-14%, fused magnesite 8-10%, fluorite 8-10%, silicon powder 6-8%, rare earth ferrosilicon 1-3%, manganese powder 2-3% and iron powder 0-14%, above proportioning is weight percentage.Stainless sheet steel laser weld packing material prepared by the present invention, for filling stainless steel weld joint metal, can effectively improve appearance of weld outward appearance.
Description
Technical field
The invention belongs to welding technology field, be specifically related to a kind of stainless sheet steel laser weld packing material and preparation method thereof.
Background technology
Stainless sheet steel (if thickness is the stainless sheet steels such as SUS304, SUS316 of 0.8-2.0mm) is widely used in its good heat resistance, corrosion resistance and mouldability the equipment and the parts that make the industries such as food, chemical industry, atomic energy, and household electrical appliances, automobile, medical apparatus, building materials and ship components etc.Normal employing Laser Welding soldering stainless steel thin plate in manufacturing industry at present.Laser Welding welding has that welding quality is good, efficiency is high, low cost and other advantages.In welding process, put into the welding material such as welding rod or welding wire in stainless sheet steel weld zone, welding rod, welding wire jointly melt formation deposited metal with stainless sheet steel mother metal under the effect of laser thermal source, and produce complicated physical-chemical reaction, solidify formation weld seam.The exterior quality of weld zone performance and Thin Stainless Steel slab products, heat resistance, anticorrosion stress-resistant performance and mechanical performance are closely related, thus particular importance.In laser weld stainless sheet steel process, laser high temperature makes Metal gasification, produces obvious pit in commissure, and as shown in Figure 1, ripple and oxidative phenomena also appear in face of weld, as shown in Figure 2.The defect such as pit and ripple not only affects the outward appearance of goods, and causes weld zone stress to concentrate, and service life declines.
Summary of the invention
Technical problem to be solved by this invention is for above shortcomings in prior art, provides a kind of granularity moderate, easy to use and stainless sheet steel laser weld packing material that effectively can improve stainless steel products outward appearance and weld zone performance and preparation method thereof.
Solve technical scheme that the technology of the present invention problem adopts be after this stainless sheet steel laser weld packing material is mixed with binding agent by powder body material again through granulation, sieve, bake gained, described powder body material comprises the component of following proportioning:
Above proportioning is weight percentage.
Alloyed powder in powder body material of the present invention, as chromic carbide iron, nickel powder, is melted into filling metal under the effect of laser, supplements the pit of weld seam.Mineral powder forms slag as rutile, fluorite, reduces the surface tension of liquid metal on the one hand, improves weld metal and is shaped, avoid occurring ripple, form skull on the other hand, prevent weld metal to be oxidized at weld face.
Preferably, described chromic carbide iron is containing Cr>=62%, and rutile is containing TiO
2>=98%, fused magnesite is containing MgO>=97%, and fluorite is containing CaF
2>=98%, silicon powder is containing SiO
2>=99.8%, above ratio is all weight percentage, and described rare earth ferrosilicon meets GB/T4137-2004 standard, and the granularity of described powder body material is 60-80 order (180-250 μm).
Preferably, described binding agent is volume ratio is the KP1 of 1:3 and the mixed liquor of sodium silicate, and the Baume degrees of mixed liquor is 37-38.
Preferably, described stainless sheet steel laser weld packing material particle diameter is 20-30 order (550-830 μm).
Present invention also offers the preparation method of above-mentioned stainless sheet steel laser weld packing material, it comprises the following steps:
(1) mix: stirred by powder body material described above, and add binding agent and stir, binding agent addition is as the criterion to be easy to shaping, obtains mixing bed material;
(2) granulation: step (1) gained mixing bed material is placed in comminutor granulation, obtains graininess blank;
(3) sieve: step (2) gained graininess blank is successively crossed screen cloth by 20 orders and 40 objects and sieves, filter out granular size and fill blank between 20 orders and 40 objects;
(4) bake: step (3) gained is filled blank and is placed in electric furnace, to be no more than the heating rate of 100 DEG C/h, when furnace temperature reaches 320 DEG C, insulation 5-6 hour, then be cooled to room temperature to take out, obtain stainless sheet steel laser weld packing material.
Stainless sheet steel laser weld packing material is laid in stainless sheet steel weld zone when being and adopting laser welding process by the using method of stainless sheet steel laser weld packing material of the present invention, and lay thickness is 1-2mm.Under the effect of laser, stainless sheet steel laser weld packing material of the present invention and soldered stainless steel melt jointly, form weld seam.
The invention has the beneficial effects as follows: adopt the method being simple and easy to repetition to cure at a lower temperature and prepare stainless sheet steel laser weld packing material, and the weld seam packing material of preparation can fill and lead up weld seam, thus effectively improve the outward appearance of stainless steel products.
Accompanying drawing explanation
Fig. 1 is the pit enlarged diagram produced in weld seam when stainless sheet steel adopts Laser Welding to weld in prior art;
Fig. 2 is the ripple and oxide layer enlarged diagram that when stainless sheet steel adopts Laser Welding to weld in prior art, face of weld produces;
Fig. 3 adopts stainless sheet steel laser weld packing material prepared in the present invention's specific embodiment to fill weld seam rear surface schematic diagram.
In figure: 1-Laser Welding; 2-stainless sheet steel laser weld packing material; 3-stainless sheet steel.
Detailed description of the invention
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with accompanying drawing, the present invention is described in further detail.
As illustrated in fig. 1 and 2, in prior art, when stainless sheet steel adopts Laser Welding welding, often can cause pit in weld zone, might as well there is ripple and oxide layer in face of weld.
The embodiment of the present invention various powder body material particle diameter used is 60-80 order.Chromic carbide iron in the embodiment of the present invention is containing Cr>=62%, and rutile is containing TiO
2>=98%, fused magnesite is containing MgO>=97%, and fluorite is containing CaF
2>=98%, silicon powder is containing SiO
2>=99.8%.
Embodiment one
Take the mixing of 34wt% chromic carbide iron, 15wt% rutile, 14wt% nickel powder, 9wt% fused magnesite, 9wt% fluorite, 8wt% silicon powder, 1wt% rare earth ferrosilicon, 2wt% manganese powder and 8wt% iron powder, after stirring, add binding agent, binding agent is volume ratio is the KP1 of 1:3 and the mixed liquor of sodium silicate, mixed liquor Baume degrees is 38, comminutor granulation is put into after stirring, obtain graininess blank, again graininess blank is successively crossed screen cloth by 20 orders and 30 objects to sieve, filter out granular size and fill blank between 20 orders and 30 objects; Then the filling blank filtered out is placed in kiln, to be no more than the heating rate of 100 DEG C/h, cures 5 hours at 320 DEG C, be then cooled to less than 50 DEG C and come out of the stove, obtain stainless sheet steel laser weld packing material.
As Fig. 1 be do not use weld seam packing material condition in prior art under adopt Laser Welding to weld the SUS304 stainless sheet steel of 0.8mm time weld seam side enlarged diagram, can see that obvious pit appears in face of weld.Laser Welding 1 is adopted to weld the SUS304 stainless sheet steel 3 of 0.8mm by method as shown in Figure 3, the stainless sheet steel laser weld packing material 2 prepared by the present embodiment is laid in the weld zone (lay thickness 2mm) between SUS304 stainless sheet steel 3, does not occur pit, ripple or oxidative phenomena in commissure.
The table 1 stainless sheet steel laser weld packing material be depicted as prepared by the present embodiment is fused to chemical composition (wt%) test result of weld metal after weld seam.
Stainless sheet steel laser weld packing material prepared by table 1 embodiment one is fused to the chemical component table (wt%) of weld metal after weld seam
Embodiment two
Take the mixing of 36wt% chromic carbide iron, 18wt% rutile, 12wt% nickel powder, 8wt% fused magnesite, 10wt% fluorite, 6wt% silicon powder, 3wt% rare earth ferrosilicon, 3wt% manganese powder and 4wt% iron powder, after stirring, add binding agent, binding agent is volume ratio is the KP1 of 1:3 and the mixed liquor of sodium silicate, mixed liquor Baume degrees is 38, comminutor granulation is put into after stirring, obtain graininess blank, again graininess blank is successively crossed screen cloth by 20 orders and 30 objects to sieve, filter out granular size and fill blank between 20 orders and 30 objects; Then the filling blank filtered out is placed in kiln, to be no more than the firing rate heating of 100 DEG C per hour, to cure 6 hours at 320 DEG C, be then cooled to less than 50 DEG C and come out of the stove, obtain stainless sheet steel laser weld packing material.
When adopting the SUS316 stainless sheet steel of the stainless sheet steel laser weld packing material prepared of the present embodiment for laser weld 2mm (lay thickness 1mm), there is not pit, ripple or oxidative phenomena in face of weld flat smooth.
Embodiment three
Take the mixing of 35wt% chromic carbide iron, 16wt% rutile, 13wt% nickel powder, 10wt% fused magnesite, 8wt% fluorite, 7wt% silicon powder, 2wt% rare earth ferrosilicon, 3wt% manganese powder and 6wt% iron powder, after stirring, add binding agent, mixed liquor Baume degrees is 37, binding agent is volume ratio is the KP1 of 1:3 and the mixed liquor of sodium silicate, comminutor granulation is put into after stirring, obtain graininess blank, again graininess blank is successively crossed screen cloth by 20 orders and 30 objects to sieve, filter out granular size and fill blank between 20 orders and 30 objects; Then the filling blank filtered out is placed in kiln, to be no more than the firing rate heating of 100 DEG C per hour, to cure 5 hours at 320 DEG C, be then cooled to less than 50 DEG C and come out of the stove, obtain stainless sheet steel laser weld packing material.
When adopting the SUS316 stainless sheet steel of the stainless sheet steel laser weld packing material prepared of the present embodiment for laser weld 0.8mm (lay thickness 1mm), there is not pit, ripple or oxidative phenomena in face of weld flat smooth.
By the above detailed description to the embodiment of the present invention, can understand and the invention solves weld seam when stainless sheet steel in prior art adopts Laser Welding welding and occur the defect such as pit, ripple thus the problem affecting outward appearance and goods service life, adopt Laser Welding soldering stainless steel thin plate front at surface, weld zone lay one deck packing material, not only smooth welding joint is attractive in appearance, and extends stainless steel products service life.
Be understandable that, the illustrative embodiments that above embodiment is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (5)
1. a stainless sheet steel laser weld packing material, after being mixed with binding agent by powder body material again through granulation, sieve, bake gained, it is characterized in that described powder body material comprises the component of following proportioning:
Above proportioning is weight percentage.
2. stainless sheet steel laser weld packing material according to claim 1, it is characterized in that described chromic carbide iron is containing Cr>=62%, rutile is containing TiO
2>=98%, fused magnesite is containing MgO>=97%, and fluorite is containing CaF
2>=98%, silicon powder is containing SiO
2>=99.8%, above ratio is all weight percentage, and described rare earth ferrosilicon meets GB/T4137-2004 standard, and the granularity of described powder body material is 60-80 order.
3. stainless sheet steel laser weld packing material according to claim 1 and 2, it is characterized in that described binding agent be volume ratio is the KP1 of 1:3 and the mixed liquor of sodium silicate, the Baume degrees of mixed liquor is 37-38.
4. stainless sheet steel laser weld packing material according to claim 3, is characterized in that described stainless sheet steel laser weld packing material particle diameter is 20-30 order.
5. a preparation method for the arbitrary described stainless sheet steel laser weld packing material of claim 1-4, is characterized in that comprising the following steps:
(1) mix: stirred by arbitrary for claim 1-4 described powder body material, and add binding agent and stir, binding agent addition is as the criterion to be easy to shaping, obtains mixing bed material;
(2) granulation: step (1) gained mixing bed material is placed in comminutor granulation, obtains graininess blank;
(3) sieve: step (2) gained graininess blank is successively crossed screen cloth by 20 orders and 30 objects and sieves, filter out granular size and fill blank between 20 orders and 30 objects;
(4) bake: step (3) gained is filled blank and is placed in electric furnace, to be no more than the heating rate of 100 DEG C/h, when furnace temperature reaches 320 DEG C, insulation 5-6 hour, then be cooled to room temperature to take out, obtain stainless sheet steel laser weld packing material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310449939.1A CN103521944B (en) | 2013-09-27 | 2013-09-27 | A kind of stainless sheet steel laser weld packing material and preparation method thereof |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201310449939.1A CN103521944B (en) | 2013-09-27 | 2013-09-27 | A kind of stainless sheet steel laser weld packing material and preparation method thereof |
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| CN103521944A CN103521944A (en) | 2014-01-22 |
| CN103521944B true CN103521944B (en) | 2016-01-20 |
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| CN112496593B (en) * | 2020-11-20 | 2022-06-17 | 北京市燃气集团有限责任公司 | Solder fill compositions and methods and applications |
| CN114833488A (en) * | 2022-04-15 | 2022-08-02 | 大连海事大学 | Filling powder for laser welding of EH36 steel and preparation method and use method thereof |
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| JP3476125B2 (en) * | 1998-12-09 | 2003-12-10 | 株式会社神戸製鋼所 | Flux-cored wire for duplex stainless steel welding |
| CN1094808C (en) * | 2000-12-07 | 2002-11-27 | 房爱存 | High-temp antiwear surfacing welding electrode |
| CN100475423C (en) * | 2007-11-09 | 2009-04-08 | 攀钢集团攀枝花钢铁研究院 | Corrosion-resistant welding rod and preparation method thereof |
| CN101767256A (en) * | 2010-03-29 | 2010-07-07 | 刘西昆 | Hard-face alloy flux-cored wire material |
| CN102744496B (en) * | 2012-07-05 | 2014-08-13 | 武汉宇宙科技有限公司 | Surface overlaying and processing method for pinch roller manufacturing and repairing |
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Denomination of invention: Stainless steel sheet laser welding weld joint filling materials and manufacturing method thereof Effective date of registration: 20190328 Granted publication date: 20160120 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: WUHAN OPTICAL VALLEY MECHANICAL & ELECTRICAL TECHNOLOGY CO.,LTD. Registration number: 2019420000009 |
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Denomination of invention: A filler material for laser welding of stainless steel sheet and its preparation method Effective date of registration: 20210624 Granted publication date: 20160120 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: WUHAN OPTICAL VALLEY MECHANICAL & ELECTRICAL TECHNOLOGY Co.,Ltd. Registration number: Y2021420000045 |
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Date of cancellation: 20220623 Granted publication date: 20160120 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: WUHAN OPTICAL VALLEY MECHANICAL & ELECTRICAL TECHNOLOGY CO.,LTD. Registration number: Y2021420000045 |
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Denomination of invention: A weld filler material for laser welding of stainless steel sheet and its preparation method Effective date of registration: 20220627 Granted publication date: 20160120 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: WUHAN OPTICAL VALLEY MECHANICAL & ELECTRICAL TECHNOLOGY CO.,LTD. Registration number: Y2022420000183 |
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Date of cancellation: 20230621 Granted publication date: 20160120 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: WUHAN OPTICAL VALLEY MECHANICAL & ELECTRICAL TECHNOLOGY CO.,LTD. Registration number: Y2022420000183 |
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Denomination of invention: A filler material for welding seam of stainless steel sheet by Laser beam welding and its preparation method Effective date of registration: 20230626 Granted publication date: 20160120 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: WUHAN OPTICAL VALLEY MECHANICAL & ELECTRICAL TECHNOLOGY CO.,LTD. Registration number: Y2023420000244 |
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