CN112743257A - Additive for welding rod coating - Google Patents
Additive for welding rod coating Download PDFInfo
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- CN112743257A CN112743257A CN201911050380.9A CN201911050380A CN112743257A CN 112743257 A CN112743257 A CN 112743257A CN 201911050380 A CN201911050380 A CN 201911050380A CN 112743257 A CN112743257 A CN 112743257A
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- China
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- parts
- additive
- rare earth
- deoxidizer
- cryolite
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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
- B23K35/36—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
Abstract
The invention relates to an additive for a welding rod coating, which mainly comprises a composite rare earth oxide, cryolite, a deoxidizer and an alloying agent, wherein the mass ratios of the composite rare earth oxide, the cryolite, the deoxidizer and the alloying agent are respectively as follows: 1-4 parts of composite rare earth oxide, 1-3 parts of cryolite, 8-15 parts of deoxidizer and 0-5 parts of alloying agent. The additive of the welding rod coating is added into the welding rod coating, so that the welding seam structure can be refined, slag inclusion of deposited metal can be realized, the ferrite content can be increased, the low-temperature impact toughness of welding seam metal can be improved, and the content of diffusible hydrogen in the welding seam can be reduced.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to an additive for a coating of a welding rod.
Background
With the rapid development of petrochemical engineering, marine engineering of ships and large metal structural members in China, the requirements on the performance indexes of welded structures are higher and higher. Therefore, the solder material matched with the solder material must have more excellent performance. In order to meet the market demand, high-toughness welding rods are developed. The traditional T507 welding rod adopts a carbon H08E core and an alkaline low-hydrogen coating, and statistics show that: the welding seam strength of the welding rod can meet the requirement, but the welding rod has low impact toughness and is unstable at low temperature and can not meet the requirement. The H08 wire rod alloy system produced on the continuous rolling line of the steel mill is a manganese-silicon series, and the welding rod is characterized in that the mechanical property is ideal when the working environment temperature is above minus 30 ℃, but the low-temperature impact toughness value of the deposited metal fluctuates greatly and the descending trend is obvious when the working environment temperature is below minus 30 ℃.
Disclosure of Invention
The invention aims to solve the problems and provide an additive for an electrode coating, wherein the additive is added into the J507 electrode coating, so that the manufacturability of the electrode can be improved, and the aims of refining grains and improving the low-temperature toughness of deposited metal are fulfilled by microalloying the electrode.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the additive for the electrode coating is characterized in that the main components of the additive comprise a composite rare earth oxide, cryolite, a deoxidizer and an alloying agent, wherein the mass ratios of the composite rare earth oxide, the cryolite, the deoxidizer and the alloying agent are respectively as follows: 1-4 parts of composite rare earth oxide, 1-3 parts of cryolite, 8-15 parts of deoxidizer and 0-5 parts of alloying agent.
Further, the composite rare earth oxide refers to oxide powder at least containing cerium (Ce), lanthanum (La), neodymium (Nd) and yttrium (Y) rare earth elements, and the particle size is 160 meshes; the mass fractions of the components are respectively as follows: 6-7 parts of cerium (Ce), 2-3 parts of lanthanum (La), 5-10 parts of neodymium (Nd) and yttrium (Y).
Further, the molecular formula of the cryolite is NaAlF6The mass percentage content is not less than 99 percent, and the granularity is 160 meshes.
Further, the deoxidizer is alloy powder at least containing ferrosilicon (Si-Fe), manganese (Mn), ferrotitanium (Ti-Fe) and silicocalcium (Si-Ca), the granularity is 60 meshes, and the deoxidizer comprises the following components in percentage by mass: 1-2 parts of ferrosilicon (Si-Fe), 1-4 parts of manganese (Mn), 5-8 parts of ferrotitanium (Ti-Fe) and 1-3 parts of silicon calcium (Si-Ca);
further, the alloying agent is an alloy powder at least containing chromium (Cr), nickel (Ni) and ferromolybdenum (Mo-Fe), the granularity is 60 meshes, and the mass fractions of the components are respectively as follows: 1-3 parts of chromium (Cr), 0.5-1.5 parts of nickel (Ni) and 0.5-2 parts of ferromolybdenum (Mo-Fe).
Compared with the prior art, the invention has the beneficial characteristics that:
the additive of the welding rod coating is added into the welding rod coating, so that the welding seam structure can be refined, slag inclusion of deposited metal can be realized, the ferrite content can be increased, the low-temperature impact toughness of welding seam metal can be improved, and the content of diffusible hydrogen in the welding seam can be reduced.
The research and comparison of the specific embodiment of the invention show that the rare earth oxide in the welding rod coating can decompose rare earth active atoms at the high-temperature stage of molten drops, and the rare earth oxide is transferred into a molten pool to participate in the metallurgical reaction of welding, thereby playing a further role in desulfurization and deoxidation for the welding molten pool.
Description of the drawings:
FIG. 1 shows the comparison of physical and mechanical properties of the electrodes prepared by the present invention with the comparative examples.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention and to clearly and unequivocally define the scope of the present invention.
The first embodiment is as follows: the additive of the embodiment comprises 2 parts of composite rare earth oxide, 1.5 parts of cryolite and 10 parts of deoxidizer, wherein the parts are weight units.
The manufacturing process comprises the following steps: accurately weighing the components of the composite rare earth oxide: 70 percent of cerium (Ce), 25 percent of lanthanum (La), 5 percent of neodymium (Nd) and yttrium (Y), 20 grams in total, and a 160-mesh sieve; weighing cryolite (NaAlF) as chemical raw material6)15 g, the purity is 99.99%, and the product is sieved by a 160-mesh sieve; weighing 10 percent of ferrosilicon (Si-Fe), 10 percent of metal manganese (Mn), 70 percent of ferrotitanium (Ti-Fe) and 10 percent of silicocalcium (Si-Ca), totaling 100 grams, and sieving by a 60-mesh sieve; weighing the components according to the weight proportion and then uniformly mixing the components.
The additive of the second embodiment of the invention comprises 1 part of composite rare earth oxide, 3 parts of cryolite, 8 parts of deoxidizer and 5 parts of alloying agent, wherein the parts are weight units.
The manufacturing process comprises the following steps: accurately weighing the components of the composite rare earth oxide: 60% of cerium (Ce), 20% of lanthanum (La), 10% of neodymium (Nd) and yttrium (Y), 10 g in total, and sieving by a 160-mesh sieve; weighing cryolite (NaAlF) as chemical raw material6)30 g, the purity is 99.99 percent, and the product is sieved by a 160-mesh sieve; weighing 20% of ferrosilicon (Si-Fe), 10% of metal manganese (Mn), 50% of ferrotitanium (Ti-Fe) and 20% of silicocalcium (Si-Ca), accounting for 80 g, and sieving by a 60-mesh sieve; weighing 60% of chromium (Cr), 30% of nickel (Ni) and 10% of ferromolybdenum (Mo-Fe), wherein the total amount is 50 g, and sieving by a 60-mesh sieve; weighing the components according to the weight proportion and then uniformly mixing the components.
Example three: the additive of the invention contains 4 parts of composite rare earth oxide, 1 part of cryolite, 15 parts of deoxidizer and 3 parts of alloying agent, wherein the parts are weight units.
The manufacturing process comprises the following steps: accurately weighing each component of the composite rare earth oxide: 60% of cerium (Ce), 25% of lanthanum (La), 15% of neodymium (Nd) and yttrium (Y), 40 g in total, and sieving by a 160-mesh sieve; weighing cryolite (NaAlF) as chemical raw material6)10 g, the purity is 99.99 percent, and the product is sieved by a 160-mesh sieve; weighing 15 percent of ferrosilicon (Si-Fe), 25 percent of metal manganese (Mn), 50 percent of ferrotitanium (Ti-Fe) and 10 percent of silicocalcium (Si-Ca), totaling 150 grams, and sieving by a 60-mesh sieve; weighing 20 percent of chromium (Cr), 30 percent of nickel (Ni) and 50 percent of ferromolybdenum (Mo-Fe) which account for 30 grams, and sieving by a 60-mesh sieve; weighing the components according to the weight proportion and then uniformly mixing the components.
The components are mixed according to the following mass ratio: in calcium carbonate (CaCO)3) 32% of calcium fluoride (CaF)2)21% of titanium dioxide (TiO)2)7% of silicon dioxide (SiO)2) On the basis of 5 percent of slag system, 14.5 to 17.3 percent of the additive and 20.5 to 17.7 percent of iron powder which are described in the first to third embodiments are respectively added, mixed uniformly by a V-shaped dry mixer, and then wet-mixed by using water glass as a binder and uniformly coated and pressed on the surface of a common H08E welding core by a welding rod coating machine to prepare the welding rod.
The impact value of the welding rod prepared according to the conditions is 100-150J measured at-30 ℃; the tensile strength of the material is 500 MPa-700 MPa measured at the normal temperature of 20 ℃.
The welding rod prepared according to the above conditions is baked for one hour at 400 ℃, and the volume content of diffusible hydrogen in weld metal is lower than 0.02 ml/g. The welding rod of the invention has the advantages of excellent welding manufacturability, such as small splashing, easy slag removal, beautiful welding line formation and excellent arc striking performance.
The two additives described in the first embodiment and the second embodiment are respectively added into the coating of the common alkaline low-hydrogen slag system welding rod, welding experiments are carried out on the produced carbon steel and low-alloy high-strength steel welding rods according to GB5118-85 and GB5117-85, and the results of physical and mechanical properties are respectively listed in Table 1. In a comparison of the experimental results it can be seen that: the welding rod with the additive added in the coating has obvious effect of improving the impact toughness.
In Table 1, the comparative examples used are J507, J707, and J507, J707 are commercially available plain carbon steel and low-alloy high-strength steel electrodes.
From the comparative analysis of the above table it can be seen that: the welding rod additive is added into the welding rod coating, and influences on the welding seam structure and low-temperature toughness of low alloy steel, the impact value measured at-30 ℃ in the invention examples is 110 and 150J, and the impact value measured at-30 ℃ in the comparison examples is 50 and 60J, so that the invention examples embody good toughness at low temperature. Experimental results show that the additive is added into the coating, so that the low-temperature toughness of the welding seam is best, the manufacturability of the basic coating welding rod is improved, and the comprehensive performance of the welding rod is best.
The deoxidizer of the welding electrode is usually added into the coating of the welding electrode, enters slag along with the melting of the coating during welding, and performs a series of deoxidation reactions in a molten pool stage through the slag and deposited metal so as to achieve the aim of deoxidation. Generally, any oxygen scavenger can be used as long as it has a higher affinity for oxygen than iron. For welding electrodes, the deoxidation product is also required to be stable and to float easily into slag due to the characteristics of the weld metallurgy. The commonly used deoxidizers are manganese, silicon, titanium, aluminum, carbon, rare earths, etc., and are mostly added in the form of iron alloy and pure metal powder. Part of deoxidizer added in the coating enters slag through deoxidation reaction, and part of deoxidizer enters deposited metal to participate in micro-alloying, so that the strength and the toughness of the deposited metal are improved. The addition type and amount of the deoxidizer not only influence the deoxidation effect, but also have great influence on the mechanical property of the weld metal. The invention adopts the method of taking ferrotitanium deoxidation as the main part and jointly deoxidizing a plurality of alloys of manganese metal and calcium silicon to achieve good effect.
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, that the preferred embodiments of the present invention are described above and the present invention is not limited to the preferred embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the present invention and these changes and modifications are within the scope of the invention as claimed.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The additive for the electrode coating is characterized in that the main components of the additive comprise a composite rare earth oxide, cryolite, a deoxidizer and an alloying agent, wherein the mass ratios of the composite rare earth oxide, the cryolite, the deoxidizer and the alloying agent are respectively as follows: 1-4 parts of composite rare earth oxide, 1-3 parts of cryolite, 8-15 parts of deoxidizer and 0-5 parts of alloying agent.
2. The additive for electrode coating of claim 1, wherein said compound rare earth oxide is oxide powder containing at least rare earth elements of cerium (Ce), lanthanum (La), neodymium (Nd) and yttrium (Y), and has a particle size of 160 mesh; the mass fractions of the components are respectively as follows: 6-7 parts of cerium (Ce), 2-3 parts of lanthanum (La), 5-10 parts of neodymium (Nd) and yttrium (Y).
3. The additive for electrode coating of claim 1 wherein said cryolite has the formula NaAlF6The mass percentage content is not less than 99.00 percent, and the granularity is 160 meshes.
4. The additive for the coating of the welding electrode as defined in claim 1, wherein said deoxidizer is an alloy powder containing at least ferrosilicon (Si-Fe), manganese (Mn), ferrotitanium (Ti-Fe), and silicocalcium (Si-Ca), and has a particle size of 60 meshes, and the mass fractions of the components are: 1-2 parts of ferrosilicon (Si-Fe), 1-4 parts of manganese (Mn), 5-8 parts of ferrotitanium (Ti-Fe) and 1-3 parts of silicon calcium (Si-Ca).
5. The additive for the coating of the welding electrode as defined in claim 1, wherein said alloying agent is an alloy powder at least containing chromium (Cr), nickel (Ni), and ferromolybdenum (Mo-Fe), the particle size is 60 meshes, and the mass fractions of the components are respectively: 1-3 parts of chromium (Cr), 0.5-1.5 parts of nickel (Ni) and 0.5-2 parts of ferromolybdenum (Mo-Fe).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911050380.9A CN112743257A (en) | 2019-10-31 | 2019-10-31 | Additive for welding rod coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911050380.9A CN112743257A (en) | 2019-10-31 | 2019-10-31 | Additive for welding rod coating |
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| CN112743257A true CN112743257A (en) | 2021-05-04 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1123926A (en) * | 1966-03-21 | 1968-08-14 | Murex Welding Processes Ltd | Improvements in arc welding electrodes |
| CN1089200A (en) * | 1992-12-29 | 1994-07-13 | 陈保国 | Rare-earth type crack-resisting welding electrode without preheating for build-up welding |
| CN102554500A (en) * | 2010-12-28 | 2012-07-11 | 昆山京群焊材科技有限公司 | High-strength and high-toughness low alloy steel electric welding rod |
| CN102873473A (en) * | 2012-09-28 | 2013-01-16 | 西安理工大学 | Low-hydrogen alkaline electrode for online welding of X80 pipeline steel |
| JP2014036992A (en) * | 2012-08-20 | 2014-02-27 | Kobe Steel Ltd | Low hydrogen type coated electrode |
| CN105234594A (en) * | 2015-11-20 | 2016-01-13 | 四川大西洋焊接材料股份有限公司 | Welding rod suitable for high-temperature resistant and creep resistant steel and preparation method thereof |
| CN106808113A (en) * | 2017-03-03 | 2017-06-09 | 四川大西洋焊接材料股份有限公司 | Ultra supercritical material C supporting welding rod of B2 steel suitable for Long-term Service under High Temperature and preparation method thereof |
| CN109719419A (en) * | 2018-12-31 | 2019-05-07 | 苏州新普新材料科技有限公司 | A kind of basic coating chrome molybdenum steel electrode and preparation method thereof |
| CN110076477A (en) * | 2019-04-26 | 2019-08-02 | 北京工业大学 | A kind of method that multi-pass welding deposited metal obtains complex phase segmentation microstructure and high-strength tenacity |
-
2019
- 2019-10-31 CN CN201911050380.9A patent/CN112743257A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1123926A (en) * | 1966-03-21 | 1968-08-14 | Murex Welding Processes Ltd | Improvements in arc welding electrodes |
| CN1089200A (en) * | 1992-12-29 | 1994-07-13 | 陈保国 | Rare-earth type crack-resisting welding electrode without preheating for build-up welding |
| CN102554500A (en) * | 2010-12-28 | 2012-07-11 | 昆山京群焊材科技有限公司 | High-strength and high-toughness low alloy steel electric welding rod |
| JP2014036992A (en) * | 2012-08-20 | 2014-02-27 | Kobe Steel Ltd | Low hydrogen type coated electrode |
| CN102873473A (en) * | 2012-09-28 | 2013-01-16 | 西安理工大学 | Low-hydrogen alkaline electrode for online welding of X80 pipeline steel |
| CN105234594A (en) * | 2015-11-20 | 2016-01-13 | 四川大西洋焊接材料股份有限公司 | Welding rod suitable for high-temperature resistant and creep resistant steel and preparation method thereof |
| CN106808113A (en) * | 2017-03-03 | 2017-06-09 | 四川大西洋焊接材料股份有限公司 | Ultra supercritical material C supporting welding rod of B2 steel suitable for Long-term Service under High Temperature and preparation method thereof |
| CN109719419A (en) * | 2018-12-31 | 2019-05-07 | 苏州新普新材料科技有限公司 | A kind of basic coating chrome molybdenum steel electrode and preparation method thereof |
| CN110076477A (en) * | 2019-04-26 | 2019-08-02 | 北京工业大学 | A kind of method that multi-pass welding deposited metal obtains complex phase segmentation microstructure and high-strength tenacity |
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Application publication date: 20210504 |
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