CN110293330B - Self-protection flux-cored wire for submerged-arc welding - Google Patents
Self-protection flux-cored wire for submerged-arc welding Download PDFInfo
- Publication number
- CN110293330B CN110293330B CN201910593516.4A CN201910593516A CN110293330B CN 110293330 B CN110293330 B CN 110293330B CN 201910593516 A CN201910593516 A CN 201910593516A CN 110293330 B CN110293330 B CN 110293330B
- Authority
- CN
- China
- Prior art keywords
- powder
- welding
- flux
- cored wire
- self
- 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.)
- Active
Links
Images
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
-
- 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
-
- 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
- B23K35/3033—Ni as the principal constituent
-
- 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
- B23K35/362—Selection of compositions of fluxes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention provides a self-protecting flux-cored wire for submerged-arc welding, which is characterized in that liquid slag completely covers an electric arc, a molten drop and a molten pool in the welding process, the wire comprises a metal sheath and a flux core, the metal sheath is an N6 nickel strip, and a neutral fluoride-rutile type slag system is used as a flux core basic slag system. The flux core formula consists of rutile, fluoride, manganese powder, aluminum powder, molybdenum powder, chromium powder and iron powder, and the mass percentages of the components are as follows: 10-35% of rutile, 20-40% of fluoride, 10-20% of manganese powder, 3-10% of aluminum powder, 5-15% of molybdenum powder, 0-5% of chromium powder and the balance of iron powder.
Description
Technical Field
The invention belongs to the technical field of welding materials, and particularly relates to a self-shielded flux-cored wire similar to submerged-arc welding.
Background
The underwater welding technology is one of key technologies for developing oceans, exploiting submarine oil, assembling and maintaining large-scale marine structures such as oil drilling platforms, oil pipelines, submarine warehouses and the like, is also a necessary technical means for emergency repair of ships and warships, offshore rescue, bridge erection and the like, and is also widely applied to industries such as nuclear power, ports, bridges and the like in recent years. The underwater wet welding has the advantages of simple equipment, low cost, flexible operation, strong applicability and the like, and can meet the application of underwater welding engineering. The self-protection flux-cored wire has the advantages of automatic welding and the like, so that the self-protection flux-cored wire is easier to apply in the underwater welding construction process. However, in the underwater welding process, as water is electrolyzed by welding arc, a large amount of hydrogen and oxygen are generated, so that the content of diffused hydrogen of a welding joint is high; and because of the disturbance of the arc airbag, the welding process is unstable, the joint is formed poorly, and the welding spatters more, which all limit the development of underwater wet welding.
At present, the flux core components of the self-protection flux-cored wire for the underwater wet method mainly comprise an acid slag system taking oxide as a main component and an alkaline slag system taking fluoride as a main component. The acid slag welding wire has the advantages of stable welding process, good forming, low inhibition degree on diffusible hydrogen, high melting point of slag, high density and difficulty in covering a welding area. The stability of the welding process of the alkaline slag system welding wire is poorer than that of the acid slag system, although the content of diffused hydrogen of a joint can be reduced, good forming quality cannot be guaranteed, the melting point of slag is lower, the density is low, liquid slag is easy to fly out, and a welding area cannot be covered. In addition, the welding wire on the market can only realize the single welding environment application of the air environment or the water environment, and cannot achieve the multipurpose effect of welding underwater and in the air. Therefore, a self-shielded flux-cored wire for a wet process, which is stable in welding process, good in welding performance and low in diffusible hydrogen content and can realize dual-environment operation in underwater and air environments, is urgently needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the self-shielded flux-cored wire which is stable in welding process, good in welding forming performance and low in diffusible hydrogen content, and the wire can realize the multipurpose effect of welding in water environment and air environment.
A kind of self-protecting flux cored wire of submerged arc welding, including metal sheath and flux core, the metal sheath is the nickel strap of N6, characterized by, regard basic slag system of flux core as neutral fluoride-rutile type slag system, the liquid slag covers electric arc, molten drop, molten bath completely in the welding process; the flux core formula consists of rutile, fluoride, manganese powder, aluminum powder, molybdenum powder, chromium powder and iron powder, and the mass percentages of the components are as follows: 10-35% of rutile, 20-40% of fluoride, 10-20% of manganese powder, 3-10% of aluminum powder, 5-15% of molybdenum powder, 0-5% of chromium powder and the balance of iron powder.
Preferably, the fluoride is CaF2In combination with LiF, CaF2The mass percentage of the catalyst to LiF is CaF2 70%~100%、LiF 0~30%。
Preferably, the filling rate of the medicine core is 22% -28%.
When the self-protection flux-cored wire for submerged arc welding is used for welding, the electric arc is completely covered by the liquid slag and is not influenced by disturbance of an external water environment, so that the electric arc has good stability and can not be broken; in addition, the molten drop transition is carried out in the liquid slag, and when the molten drop has the tendency of flying out, the molten drop cannot separate from a welding area to form splash due to the blocking effect of the molten slag, so that the splash is basically not generated in the welding process; the whole welding process is carried out under the protection of the liquid slag, and gases such as hydrogen in water cannot enter molten drops and a molten pool, so that the content of diffusible hydrogen in a welding joint is low, and the welding performance is good.
In the chemical components of the medicinal powder, the action mechanism of each component is as follows:
in the invention, rutile and fluoride mainly play a role in slagging, and the main component of rutile is TiO2By adjusting the ratio of the two, TiO is generated in the welding process2+CaF2+H2O→CaTiO3+ HF reaction to obtain slag with CaTiO as main component3The welding area can be completely covered, so that the welding process is stable, and the joint quality is high. The rutile has good arc stability, is beneficial to the stability of the welding process, can promote the stable combustion of electric arc in the welding process due to excellent electric conductivity, has high melting point and high density, can ensure that molten drops are continuously and slowly transited in molten slag, reduces the alkalinity of the molten slag, but the excessive rutile easily causes the molten slag not to easily float out, and forms slag inclusion defects in welding seams, so the content is 10-35%; and fluorideBesides being beneficial to generating slag, the method can also generate HF gas insoluble in deposited metal, so that the content of diffused hydrogen in a welding seam is reduced, excessive fluoride causes instability in the welding process, the melting point of the slag is reduced, the density is reduced, the slag flows seriously in the welding process, is not easy to cover an electric arc, and can cause unstable electric arc combustion and generate much splashing, and therefore, the content of the fluoride is 20-40%.
In the invention, the added aluminum powder mainly plays roles of deoxidation and slagging, the aluminum can preferentially react with oxygen, the burning loss of metallurgical elements is reduced, and the formed Al2O3The alkalinity of the molten slag is also reduced, but the excessive aluminum powder is easy to cause slag inclusion defect, so that the content is 3% -10%.
In the invention, the added manganese powder mainly plays roles of deoxidizing and desulfurizing the welding seam, and is transited to the welding joint to improve the metallurgical property, so the content is 10-20%.
In the invention, the added molybdenum powder and chromium powder are mainly transferred into the welding seam, thereby improving the metallurgical property of the welding seam and ensuring the strength of the welding seam metal.
The self-protection flux-cored wire for submerged arc welding is mainly used for welding in a water environment, when the welding is carried out in an air environment, slag can cover a welding area, a molten drop transition process and an electric arc combustion process are both carried out under the coverage of the slag, and electric arc combustion is stable in the welding process.
The invention has the beneficial effects that: (1) according to the flux-cored wire prepared by the invention, the welding area is completely covered by the slag in the welding process, the molten drop transition process and the electric arc combustion process are carried out under the covering of the slag, and the electric arc combustion is not influenced by the disturbance of the external water environment, so that the electric arc combustion is stable in the welding process, no arc breaking phenomenon occurs, and when the transitional molten drop has a tendency of flying out, the molten drop cannot separate from the welding area to form splash due to the blocking effect of the slag, and the splashing rate is low; (2) the whole welding process is carried out under the protection of liquid slag, gases such as hydrogen in water cannot enter molten drops and a molten pool, the welding joint has good forming performance, the tensile strength is up to 550MPa, and the content of diffused hydrogen is lower than 5ml/100g, so that the standard of an ultralow-hydrogen welding material is achieved; (3) the welding wire can be applied to water environment and air environment.
Drawings
FIG. 1 is a schematic view of a self shielded flux cored underwater welding process for this type of submerged arc welding.
Fig. 2 is a schematic view of a prior art underwater welding process using a self-shielded flux-cored wire.
The reference numbers in the figures are: 1. a welding torch; 2. welding wires; 3. carrying out molten dripping; 4. an electric arc; 5. a workpiece; 6. liquid slag; 7. a molten pool; 8. solidifying the molten slag; 9. welding seams; 10. an arc envelope; 11. an aqueous environment.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the self-protecting flux-cored wire 2 for submerged arc welding of the invention uses a neutral fluoride-rutile type slag system as a flux-cored basic slag system, and the ratio of fluoride to rutile is adjusted, so that the combustion of the electric arc 4 is carried out under liquid slag 6 in the welding process of the flux-cored wire 2, and the electric arc 4 is not affected by the disturbance of the water environment 11, so that the combustion of the electric arc 4 is stable, and the arc breaking phenomenon is not easy to occur; in addition, the molten drop 3 is transited under the liquid slag 6, and when the molten drop 3 has a splashing tendency when being disturbed by the arc airbag 10, the molten drop 3 cannot be separated from a welding area to form splashing due to the wrapping obstruction of the liquid slag 6; the whole welding process is carried out under the protection of the liquid slag 6, and gases such as hydrogen in the water environment 11 cannot enter the molten drop 3 and the molten pool 7, so that the diffusible hydrogen content of the welding seam 9 is low, and the welding performance is good.
As shown in fig. 2, when a self-shielded flux-cored wire 2 in the prior art is welded in a water environment 11, liquid slag 6 is behind a molten pool 7, and due to the fact that the liquid slag 6 does not have a covering protection effect, combustion of an electric arc 4 and transition of a molten drop 3 are carried out in an electric arc air bag 10, the electric arc air bag 10 is directly disturbed and greatly influenced by a water environment 11, the electric arc air bag 10 is continuously generated, floats upwards and breaks in the water environment 11, and when the electric arc air bag 10 breaks, water in the water environment 11 can quickly surround the electric arc 4, so that an arc breaking phenomenon occurs; the liquid molten drops 3 are not protected by the liquid slag 6 covered on the liquid molten drops and are easy to fly out of the molten pool 7 to form splashing; in the whole welding process, gases such as hydrogen in the water environment 11 can easily enter the molten drop 3 and the molten pool 7, so that the diffused hydrogen content of the welding seam 9 is high.
The following examples are given to better illustrate the present invention, but are not intended to limit the present invention.
The specific implementation mode of the invention is that a nickel strap N6 is used as a metal sheath, 10-35% of rutile, 20-40% of fluoride, 10-20% of manganese powder, 3-10% of aluminum powder, 5-15% of molybdenum powder, 0-5% of chromium powder and the balance of iron powder are used as a flux core. Preparing medicinal powder according to the proportion, adjusting the mass percent of the components of the medicinal core powder, preparing six kinds of flux-cored wires with different mass percent as shown in table 1, screening out the components with the granularity of 80-120 meshes, accurately weighing, mixing for 2 hours in a powder mixer, and taking out.
TABLE 1 submerged-arc welding-like self-shielded flux-cored wire for underwater wet welding
| Examples | Rutile type | Calcium fluoride | Lithium fluoride | Manganese powder | Aluminum powder | Molybdenum component | Chromium powder | Iron powder |
| A | 10% | 14% | 6% | 20% | 10% | 13% | 5% | 22% |
| II | 15% | 20% | 5% | 18% | 9% | 15% | 1% | 17% |
| III | 20% | 28% | 0% | 15% | 8% | 6% | 4% | 19% |
| Fourthly | 25% | 24% | 8% | 12% | 7% | 8% | 2% | 14% |
| Five of them | 30% | 30% | 5% | 14% | 5% | 10% | 3% | 3% |
| Six ingredients | 35% | 38% | 2% | 10% | 3% | 5% | 0 | 7% |
The preparation method of the self-protection flux-cored wire comprises the following steps: selecting an N6 nickel strip with the specification as follows: 0.3mm by 8 mm. A flux-cored wire with an O-shaped cross section is prepared on a common flux-cored wire production line, the diameter of the flux-cored wire is phi 1.6mm, and the filling rate of a flux core is 22-28%.
The welding base metal used in the embodiment of the invention is a 304 stainless steel plate with the thickness of 12mm, and the mechanical properties and diffusible hydrogen content of the deposited metal after welding of six groups of flux-cored wires with different component contents obtained by experiments are shown in table 2.
TABLE 2 submerged-arc welding self-shielded flux-cored wire submerged-welded deposited metal mechanical properties and diffusible hydrogen content
| Examples | A | II | III | Fourthly | Five of them | Six ingredients |
| Tensile strength (MPa) | 584 | 569 | 578 | 591 | 563 | 587 |
| Diffusible hydrogen content (ml/100 g) | 3.25 | 3.59 | 2.98 | 3.17 | 2.92 | 3.06 |
In conclusion, the submerged-arc welding-like self-shielded flux-cored wire for welding under stainless steel water provided by the embodiment of the invention has excellent welding process performance, and can well control the content of metal diffused hydrogen of a welding joint on the basis of ensuring the strength of the welding metal, wherein the content is lower than 5ml/100g, and the standard of an ultralow-hydrogen welding material is achieved. The problem that the inhibition degree of the acid slag system welding wire to the diffusible hydrogen is low in the welding process is solved, and the problems that the stability of the alkaline slag system welding wire is poor, liquid slag is easy to fly out, and a welding area cannot be covered are solved.
Claims (4)
1. A kind of self-protecting flux cored wire of submerged arc welding, including metal sheath and flux core, the metal sheath is the nickel strap of N6, characterized by that, the flux core regards neutral fluoride-rutile type slag system as the basic slag system, the liquid slag covers electric arc, molten drop, molten bath completely in the welding process, the formulation of the flux core: the alloy consists of rutile, fluoride, manganese powder, aluminum powder, molybdenum powder, chromium powder and iron powder, and the mass percent of each component is as follows: 10-35% of rutile, 20-40% of fluoride, 10-20% of manganese powder, 3-10% of aluminum powder, 5-15% of molybdenum powder, 0-5% of chromium powder and the balance of iron powder.
2. The self-shielded flux-cored wire for submerged arc welding of claim 1, wherein: fluoride made from CaF2In combination with LiF, CaF2The mass percentage of the metal oxide to LiF is as follows: CaF2 70%~100%、LiF 0~30%。
3. The self-shielded flux-cored wire for submerged arc welding of claim 1, wherein: the filling rate of the flux core is 22% -28%.
4. The self-shielded flux-cored wire for submerged arc welding of claim 1, wherein: when the flux-cored wire is used for welding, the welding area is completely covered by slag, and the processes of molten drop transition and electric arc combustion are carried out under the slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910593516.4A CN110293330B (en) | 2019-07-03 | 2019-07-03 | Self-protection flux-cored wire for submerged-arc welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910593516.4A CN110293330B (en) | 2019-07-03 | 2019-07-03 | Self-protection flux-cored wire for submerged-arc welding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110293330A CN110293330A (en) | 2019-10-01 |
| CN110293330B true CN110293330B (en) | 2021-05-11 |
Family
ID=68030030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910593516.4A Active CN110293330B (en) | 2019-07-03 | 2019-07-03 | Self-protection flux-cored wire for submerged-arc welding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110293330B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113399865B (en) * | 2021-07-20 | 2023-03-28 | 哈尔滨工业大学（威海） | Slag full-coverage type non-splashing flux-cored wire |
| CN114473288B (en) * | 2022-01-11 | 2023-10-20 | 河北联之捷焊业科技有限公司 | Welding wire for low-dilution nickel-based surfacing layer and method for preparing CMT surfacing layer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61129298A (en) * | 1984-11-27 | 1986-06-17 | Kobe Steel Ltd | Covered electrode |
| UA34882U (en) * | 2008-03-31 | 2008-08-26 | Институт Электросварки Им. Е.О.Патона Национальной Академии Наук Украины | powder wire for wet underwater welding of high-alloy chromium-nickel-molybdenum steels of 17-13-3 type |
| CN102069322A (en) * | 2010-12-24 | 2011-05-25 | 中国船舶重工集团公司第七二五研究所 | High-strength carbon dioxide protecting surfacing flux-cored wire |
| CN104057214A (en) * | 2014-07-01 | 2014-09-24 | 哈尔滨工业大学（威海） | Self-protection flux-cored wire for underwater wet-method welding |
| CN107671449A (en) * | 2017-10-20 | 2018-02-09 | 西安理工大学 | A kind of precipitation-hardening stainless steel Self-protecting flux-cored wire and preparation method thereof |
| CN108526752A (en) * | 2018-05-08 | 2018-09-14 | 山东省科学院海洋仪器仪表研究所 | One kind is paddled welding self-protection flux-cored wire under environment |
| CN111571066A (en) * | 2020-04-17 | 2020-08-25 | 江苏大学 | Low-hydrogen stainless steel self-protection flux-cored wire suitable for underwater environment |
-
2019
- 2019-07-03 CN CN201910593516.4A patent/CN110293330B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61129298A (en) * | 1984-11-27 | 1986-06-17 | Kobe Steel Ltd | Covered electrode |
| UA34882U (en) * | 2008-03-31 | 2008-08-26 | Институт Электросварки Им. Е.О.Патона Национальной Академии Наук Украины | powder wire for wet underwater welding of high-alloy chromium-nickel-molybdenum steels of 17-13-3 type |
| CN102069322A (en) * | 2010-12-24 | 2011-05-25 | 中国船舶重工集团公司第七二五研究所 | High-strength carbon dioxide protecting surfacing flux-cored wire |
| CN104057214A (en) * | 2014-07-01 | 2014-09-24 | 哈尔滨工业大学（威海） | Self-protection flux-cored wire for underwater wet-method welding |
| CN107671449A (en) * | 2017-10-20 | 2018-02-09 | 西安理工大学 | A kind of precipitation-hardening stainless steel Self-protecting flux-cored wire and preparation method thereof |
| CN108526752A (en) * | 2018-05-08 | 2018-09-14 | 山东省科学院海洋仪器仪表研究所 | One kind is paddled welding self-protection flux-cored wire under environment |
| CN111571066A (en) * | 2020-04-17 | 2020-08-25 | 江苏大学 | Low-hydrogen stainless steel self-protection flux-cored wire suitable for underwater environment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110293330A (en) | 2019-10-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5717688B2 (en) | Flux-cored wire for horizontal fillet gas shielded arc welding of crude oil tank steel | |
| CN108526752B (en) | Self-protection flux-cored wire for welding in wading environment | |
| CN109623193B (en) | Low-hydrogen high-toughness seamless flux-cored wire for low-temperature steel and preparation method thereof | |
| CN103934592B (en) | A core wire for up to 55kg weathering steel welding rod, coating and welding rod thereof and preparation method | |
| CN110293330B (en) | Self-protection flux-cored wire for submerged-arc welding | |
| JP2017013118A (en) | Flux-cored wire for stainless steel welding, stainless steel welded joint, and method for manufacturing the same | |
| JP2014113615A (en) | Flux-cored wire for carbon dioxide gas shielded arc welding | |
| CN102189353A (en) | Flux-cored wire for gas-shielding arc welding | |
| KR101088212B1 (en) | Flux-cored wire for stainless steel electro gas arc welding | |
| JP2017196651A (en) | Flux-cored wire | |
| CN104057214A (en) | Self-protection flux-cored wire for underwater wet-method welding | |
| US3221136A (en) | Method and electrode for electric arc welding | |
| WO2023160718A1 (en) | Special flux-cored welding wire for deep-sea wet fcaw and preparation method therefor | |
| CN110842394B (en) | Acid red flux stainless steel electrode with high crack resistance and porosity resistance | |
| JP2017024032A (en) | Flux-cored wire for gas shielded arc welding | |
| US20240157484A1 (en) | Full slag covering, spatter-free flux-cored welding wire | |
| CN107598414B (en) | Welding rod for marine atmosphere corrosion resistant steel | |
| JP6815157B2 (en) | Flux-cored wire for gas shielded arc welding of crude oil tank steel | |
| CN1307021C (en) | Ultralow-hydrogen type high efficiency iron powder welding rod for low alloy high streagth steel | |
| CN112108791B (en) | Alkaline seamless flux-cored wire for improving low-temperature toughness of low-alloy high-strength steel welding joint | |
| CN104874939A (en) | High-stability coating for underwater wet welding rod | |
| CN114055016A (en) | Flux-cored material, seamless flux-cored wire and manufacturing method | |
| JP7308657B2 (en) | Low-Hydrogen Covered Arc Welding Rod for Crude Oil Tank Steel | |
| JP2013252551A (en) | Flux-cored wire for gas shielded arc welding | |
| CN110497113A (en) | A kind of multiduty underwater wet welding self-protection flux-cored wire of low energy consumption |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210427 Address after: 264209, No. 2, Wenhua West Road, Huancui District, Shandong, Weihai Applicant after: HARBIN INSTITUTE OF TECHNOLOGY (WEIHAI) Applicant after: HIT (WEIHAI) INNOVATION PIONEER PARK Co.,Ltd. Address before: 264209 No. 2, Wenhua West Road, Shandong, Weihai Applicant before: HARBIN INSTITUTE OF TECHNOLOGY (WEIHAI) |
|
| TA01 | Transfer of patent application right |