CN112605555A - Self-protection flux-cored wire and preparation method thereof - Google Patents
Self-protection flux-cored wire and preparation method thereof Download PDFInfo
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- CN112605555A CN112605555A CN202011401789.3A CN202011401789A CN112605555A CN 112605555 A CN112605555 A CN 112605555A CN 202011401789 A CN202011401789 A CN 202011401789A CN 112605555 A CN112605555 A CN 112605555A
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Classifications
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- 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
- B23K35/3053—Fe 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
-
- 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
- B23K35/40—Making wire or rods for soldering or welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a self-protection flux-cored wire which is characterized by consisting of a low-carbon cold-rolled steel strip sheath and a flux core, wherein the flux core comprises the following components in percentage by weight: BaF2：25‑40％；CaF2：4‑7％；LiF：1‑3％；SrF：1‑3％；CaCO3：7‑10％；Li2CO3:2 to 5 percent; graphite: 1.5 to 2.5 percent; aluminum powder: 16 to 22 percent; aluminum magnesium alloy: 18 to 24 percent; metal manganese: 1.5 to 3.5 percent; other iron alloys: 5 to 10 percent; fe: and (4) the balance. The invention also discloses a preparation method of the composition. The self-protection flux-cored wire can be used for carrying out all-position welding with the same parameter, and the components and the joint performance of the welding seam meet the corresponding standard requirements.
Description
Technical Field
The invention belongs to the field of welding, and particularly relates to a self-protection flux-cored wire and a preparation method thereof.
Background
In industrial production and daily life, the production and manufacture of many light steel structures and small-sized components, or the damage of the structures needs to be repaired or modified, and flexible and reliable welding technology is often needed for completion. Such as buildings that do not carry large loads, steel-constructed greenhouses, outdoor billboards, agricultural implements, supports, fences, and the like. These structural strength grades are generally not too high, and are mostly light H-type, C-type, Z-type steel sections, or structures composed of primed or galvanized sheets and pipes. Therefore, the welding positions of the structures are complicated and changeable, the welding amount is relatively small, and the welding method is not suitable for welding by a welding method with large heat input amount, high equipment cost and severe operating conditions in outdoor construction operation.
Due to the characteristics of the structure and the construction conditions, the small-specification self-protection flux-cored wire is mostly adopted for welding, and the welding machine has the advantages of light equipment, convenience for carrying and ascending operation and no need of carrying a gas cylinder; the self-protection flux-cored wire has good anti-rust and windproof capabilities, and the small-size welding wire can be 0.8mm and is suitable for welding of light and thin structures.
The self-protection flux-cored wire is applied to the light structures, combines the advantages of the flux-cored wire and the welding electrode, has good adaptability, good manufacturability and simple and convenient operation, but has corresponding defects, generally has larger splashing, is easy to protect and has air holes due to insufficient protection. In practical application, a certain proportion of porosity or splash grinding is often generated, or other welding modes are selected under the condition that the requirements on important structures and welding appearances are strict.
Disclosure of Invention
Aiming at the problems of the self-shielded flux-cored wire with a light structure, the invention aims to provide the self-shielded flux-cored wire with excellent performance and flexible and convenient use.
The invention also aims to provide a preparation method of the self-protection flux-cored wire.
In order to achieve the purpose, the invention adopts the following technical scheme:
the self-protection flux-cored wire consists of a low-carbon cold-rolled steel strip sheath and a flux core, wherein the flux core comprises the following components in percentage by weight:
BaF2：25-40％；
CaF2：4-7％；
LiF：1-3％；
SrF：1-3％；
CaCO3：7-10％；
Li2CO3：2-5％；
graphite: 1.5 to 2.5 percent;
aluminum powder: 16 to 22 percent;
aluminum magnesium alloy: 18 to 24 percent;
metal manganese: 1.5 to 3.5 percent;
other iron alloys: 5 to 10 percent;
fe: and (4) the balance.
In a preferred embodiment of the invention, said CaF2Added in the form of fluorite, CaCO3It is added in the form of marble, but not limited to this.
A preparation method of the self-shielded flux-cored wire comprises the following steps:
mixing and drying the components after the components are prepared according to the set weight proportion to obtain filling powder;
and filling the filling powder into a U-shaped groove formed by rolling a steel strip, pressing the U-shaped groove into an O-shaped groove, and rolling and reducing the diameter of a die to obtain a finished product of the flux-cored wire.
In a preferred embodiment of the invention, the filling rate of the finished flux-cored wire is 7-17%, and the diameter of the wire is 0.8-1.6 mm.
In a preferred embodiment of the present invention, the particle size distribution of the combined powder of the filled medicinal powder is required to meet the following criteria:
the passing rate of the medicinal powder under 40 meshes is 100 percent;
the proportion of the 80-160 meshes of medicinal powder is 60-70%;
the passing rate of the 280-mesh medicinal powder is not more than 25%.
The invention has the beneficial effects that:
the self-protection flux-cored wire can be used for carrying out all-position welding with the same parameter, and the components and the joint performance of the welding seam meet the corresponding standard requirements.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The invention designs and adjusts the aspects of gas-forming agent, slag-forming agent, raw materials and the like, stabilizes welding electric arc, refines transition particles, and matches the viscosity and expansion coefficient of liquid and liquid molten slag in a molten pool.
Finally, when the welding wire is used for welding, the electric arc is stable, the splashing is small, the slag coverage is uniform, the slag is easy to remove, different positions can be welded by the same parameters and need to be adjusted, and in addition, 50 kg-level structures below 12mm can be welded.
The self-protection flux-cored wire provided by the invention can be used for welding light steel structures, thin plates, primer plates, galvanized plates and the like, and comprises a low-carbon steel belt sheath and filling hair wool, wherein the flux core comprises the following components in percentage by weight:
BaF2：25-40％；
CaF2：4-7％；
LiF：1-3％；
SrF：1-3％；
CaCO3：7-10％；
Li2CO3：2-5％；
graphite: 1.5 to 2.5 percent;
aluminum powder: 16 to 22 percent;
aluminum magnesium alloy: 18 to 24 percent;
metal manganese: 1.5 to 3.5 percent;
other iron alloys: 5 to 10 percent;
fe: and (4) the balance.
Wherein CaF2Added in the form of fluorite, CaCO3The addition is carried out in the manner of marble, and other addition forms can also be adopted.
The fluoride is an important component and mainly has the dual functions of gas making and slag making, and the fluoride is gasified in an arc area to isolate the harmful effect of air; meanwhile, the catalyst has strong dehydrogenation function and reduces the generation probability of hydrogen holes.
Marble and Li2CO3Can decompose and produce CO in an arc column area2The gas increases the oxygen content of the molten pool, reduces the content of dissolved nitrogen in the welding line, reduces the air hole sensitivity and improves the mechanical property of the welding line, but the excessive addition can also worsen the electric arc and generate splashing. The addition of the aluminum powder and the aluminum-magnesium alloy in the components can have strong deoxidation effect, help to form an electric arc atmosphere and isolate air to protect the meltingThe pool, but excessive addition can cause the aluminum element to be transited into the welding seam, and the brittleness of the welding seam is greatly increased.
The manganese, silicon and other elements have two main functions, namely alloying to ensure the mechanical property of the welding line and deoxidizing the liquid metal in the molten pool.
The components are combined to play roles in gas making, slag making, transition alloy making and the like, and the welding wire has good processing performance and reliable quality and is suitable for the welding flux with a light structure.
Aiming at the self-protection flux-cored wire, the preparation is completed by the following steps:
firstly, the component materials of the traditional Chinese medicine powder in the self-shielded flux-cored wire are prepared according to the proportion and then are uniformly mixed to prepare filling powder, wherein the filling powder needs to meet the following conditions:
the passing rate of the medicinal powder under 40 meshes is 100 percent;
the proportion of the 80-160 meshes of medicinal powder is 60-70%;
the passing rate of the 280-mesh medicinal powder is not more than 25%.
The particle size distribution range of the filling powder is controlled, so that the filling powder can be ensured to have proper fluidity, and the powder adding during production can have better uniformity; secondly, the filling powder has proper bulk density (smaller than other types), and the steel belt can be filled with enough quantity during production without early granulation to simplify the manufacturing process; thirdly, the stability of the electric arc can be optimized, and the welding process performance can be improved.
Then, rolling the low-carbon cold-rolled carbon steel strip into a U-shaped groove on a forming unit;
filling the prepared filling powder into a U-shaped groove of a steel strip according to the filling rate of 7-17% by a powder adding unit, and then rolling the steel strip into an O shape;
according to the above, the moderate bulk density and fluidity of the powder can control the filling rate in a large range, so that flux-cored wires with different specifications can be produced by using the same formula without adjusting the formula according to different specifications, which is an excellent point for the design of filling powder.
And finally, rolling and reducing the diameter by drawing through a die to obtain a finished welding wire with the diameter of 0.8-1.6 mm. The self-protection flux-cored wire manufactured by the method does not need gas protection during welding.
The welding wire with the diameter of 0.8-1.6mm can be made into welding wires with various specifications of 0.8/0.9/1.0/1.2/1.6mm according to the use requirement, can be more flexibly applied to base materials with different thicknesses, can be used for connecting thin plates without burning through, can also be used for filling welding seams on plates with the thickness of 12mm, and has high filling efficiency.
The metal strength of the welding seam of the self-protection flux-cored wire is 50 kilograms, and the self-protection flux-cored wire is low in air hole sensitivity and good in welding process for single-pass or multi-pass welding, spot welding and the like.
The invention is further illustrated by the following examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Any methods and materials similar or equivalent to those described herein can be used in the practice of the present invention.
Specific embodiments are shown in table 1, and mechanical properties are shown in tables 2 and 3:
table 1 shows the amounts of specific components added in example 1 and example 2:
table 2 shows the amounts of deposited metal components added in examples 1 and 2:
table 3 shows the weld metal mechanical properties of example 1 and example 2:
| performance of | Yield strength (MPa) | Tensile strength (MPa) | Elongation percentage% |
| Standard of merit | ≥390 | 490-670 | 20 |
| Deposited Metal/example 1 | 468 | 580 | 24 |
| Deposited Metal/example 2 | 450 | 560 | 25 |
Remarks are as follows: wherein the filling rate of the embodiment 1 is 8.5 percent, and the diameter of the welding wire is 0.8 mm; example 2 the filling rate was 15% and the diameter was 1.6 mm.
The welding wire test of the invention conforms to GB/T10045-2018T 49ZT11-1 NA; AWS A5.36: 2016E 71T11-AZ-CS3 standard requirements.
According to the embodiment, the self-protection flux-cored wire formed based on the scheme has the advantages that the weld metal meets the national standard requirement, and the requirement of 50 kg-grade carbon steel on welding materials is met.
The welding flux has better wind resistance, rust resistance and primer resistance, can be used for welding galvanized plates, and is suitable for outdoor operation and welding light structures. The welding wire has good welding process and stable electric arc, and can be used for all-position welding, particularly vertical downward welding.
The welding wire has strong porosity resistance, can be used for welding when the wind speed is not more than 8m/s, can be used for all-position welding under the same parameters, and can be used for self-protection welding of 50 kg-level structures with the thickness of less than 12 mm.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The self-protection flux-cored wire is characterized by consisting of a low-carbon cold-rolled steel strip sheath and a flux core, wherein the flux core comprises the following components in percentage by weight:
BaF2：25-40％；
CaF2：4-7％；
LiF：1-3％；
SrF：1-3％；
CaCO3：7-10％；
Li2CO3：2-5％；
graphite: 1.5 to 2.5 percent;
aluminum powder: 16 to 22 percent;
aluminum magnesium alloy: 18 to 24 percent;
metal manganese: 1.5 to 3.5 percent;
other iron alloys: 5 to 10 percent;
fe: and (4) the balance.
2. The self-shielded flux-cored welding wire of claim 1, wherein the CaF2Added in the form of fluorite, CaCO3It is added in the form of marble, but not limited to this.
3. The method of manufacturing a self-shielded flux-cored welding wire of claim 1 or 2, comprising the steps of:
mixing and drying the components after the components are prepared according to the set weight proportion to obtain filling powder;
and filling the filling powder into a U-shaped groove formed by rolling a steel strip, pressing the U-shaped groove into an O-shaped groove, and rolling and reducing the diameter of a die to obtain a finished product of the flux-cored wire.
4. The method for preparing the self-shielded flux-cored wire of claim 3, wherein the final flux-cored wire has a filling rate of 7-17% and a diameter of 0.8-1.6 mm.
5. The method of claim 3, wherein the combined powder size distribution of the filler powder meets the following criteria:
the passing rate of the medicinal powder under 40 meshes is 100 percent;
the proportion of the 80-160 meshes of medicinal powder is 60-70%;
the passing rate of the 280-mesh medicinal powder is not more than 25%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011401789.3A CN112605555A (en) | 2020-12-04 | 2020-12-04 | Self-protection flux-cored wire and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011401789.3A CN112605555A (en) | 2020-12-04 | 2020-12-04 | Self-protection flux-cored wire and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN112605555A true CN112605555A (en) | 2021-04-06 |
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| CN202011401789.3A Pending CN112605555A (en) | 2020-12-04 | 2020-12-04 | Self-protection flux-cored wire and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114571135A (en) * | 2022-04-11 | 2022-06-03 | 江苏东南焊材有限公司 | Self-protection flux-cored wire for low-temperature steel |
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| US3947655A (en) * | 1974-05-15 | 1976-03-30 | The Lincoln Electric Company | Cored type electrode welding |
| CN101633083A (en) * | 2009-07-31 | 2010-01-27 | 天津大学 | Coating welding wire for carbon dioxide arc welding and preparation method thereof |
| CN103962743A (en) * | 2014-04-30 | 2014-08-06 | 西安理工大学 | Welding stick for all-position welding of X100 pipeline steel and manufacturing method thereof |
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| CN106141484A (en) * | 2016-07-28 | 2016-11-23 | 江苏科技大学 | A kind of very high content vanadium modification self-protecting flux-cored wire for overlaying welding and preparation method thereof |
| CN109530960A (en) * | 2018-11-21 | 2019-03-29 | 武汉铁锚焊接材料股份有限公司 | It is a kind of suitable for the small dimension self-protection flux-cored wire of all-position welding and its application |
| CN110900034A (en) * | 2019-12-17 | 2020-03-24 | 天津市永昌焊丝有限公司 | All-position alkaline flux-cored wire |
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2020
- 2020-12-04 CN CN202011401789.3A patent/CN112605555A/en active Pending
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| US3947655A (en) * | 1974-05-15 | 1976-03-30 | The Lincoln Electric Company | Cored type electrode welding |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114571135A (en) * | 2022-04-11 | 2022-06-03 | 江苏东南焊材有限公司 | Self-protection flux-cored wire for low-temperature steel |
| CN114571135B (en) * | 2022-04-11 | 2023-09-22 | 江苏东南焊材有限公司 | Self-protection flux-cored wire for low-temperature steel |
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Application publication date: 20210406 |