CN112247395B - Composition, coating and Q690 coating-free bridge steel welding rod and preparation method thereof - Google Patents
Composition, coating and Q690 coating-free bridge steel welding rod and preparation method thereof Download PDFInfo
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- CN112247395B CN112247395B CN202011092215.2A CN202011092215A CN112247395B CN 112247395 B CN112247395 B CN 112247395B CN 202011092215 A CN202011092215 A CN 202011092215A CN 112247395 B CN112247395 B CN 112247395B
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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
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0272—Rods, electrodes, wires with more than one layer of coating or sheathing material
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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
- B23K35/3602—Carbonates, basic oxides or hydroxides
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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
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
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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
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/404—Coated rods; Coated electrodes
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Abstract
The invention discloses a composition, a coating, a Q690 coating-free bridge steel welding rod and a preparation method thereof, wherein the composition comprises the following components in percentage by mass: CaCO3：9.5～11.5％，CaF2：4～5％，TiO2：1～2％，SiO2: 1-2%, Mn: 1.25-1.5%, ferrosilicon powder 0.8-1.20%, ferromolybdenum powder 0.6-0.675%, C: 0.025-0.05%, Cr: 0.05-0.50%, Cu: 0.2-0.3%, Fe: 1.3-1.5% of Na2CO3: 0.1-0.15%, CMC: 0.1-0.15%, sodium alginate 0.15-0.20%, and Ni 1.7-1.9%. The coating is formed by coating and curing the composition; the welding rod comprises a welding core and a coating coated on the surface of the welding core; the welding rod has good welding process performance and mechanical property.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a composition, a coating and Q690 coating-free bridge steel welding rod and a preparation method thereof.
Background
At present, the steel truss is made of conventional common bridge steel, and is painted, and the steel truss needs to be painted again every several years for maintenance. The pollution of reservoir water source area can not be avoided in the coating process and the original paint film falling. The coating is not used, the pollution to the environment during coating and recoating can be avoided, and the protection of reservoir water source areas is well solved.
In the United states, coating-free weathering steel bridges were built in 1964, about 45 percent of the bridges are made of coating-free weathering steel, and the bridges are more than 23000 bridges. In 1967, painting-free weathering steel bridges were built, and at present, more than 20% of steel bridges are made of painting-free weathering steel. The steel bridge with multiple choices in bridge construction is a strategy for making full use of steel materials which can be repeatedly utilized and realize sustainable development, and the steel materials are coating-free weathering steel, are important links for popularizing green buildings and building materials and accord with the direction of national development strategy.
The novel high-strength steel has high strength, and the chemical components of the novel high-strength steel are greatly different from those of the common strength steel because ofThe stability, fatigue and fracture properties of the high-strength steel material are changed. A certain amount of research work has been carried out abroad aiming at the problems, and the method is successfully applied to a plurality of practical projects, including building structures and bridge structures, and achieves better effects. High-strength structural steel Q690 has also been successfully produced in China, but is still in the research stage when used for welding materials for bridges, and matched high-strength materials are urgently needed to meet market demands. The requirements of the steel welding rod for the Q690 bridge cannot be met in the prior art disclosures: CN105436744A discloses an electrode for welding high-strength bridge steel Q500qE, which comprises an electrode steel core and a coating, wherein the coating comprises the following components in percentage by mass: CaCO3：13～15％，CsCO3：10％，CaF2：31～33％，ZrO2：4～5％，Al2O3: 2-3%, Mn: 3.5-4%, Si: 1.8%, Ni: 4-4.5%, Cr: 1-1.5%, Cu: 1-1.5%, Sb: 0.1%, C: 0.2%, teflon: 0.5 percent, and the balance being iron powder. The deposited metal chemical composition, the deposited metal mechanical property and the deposited metal corrosion resistance of the comparison document can meet the welding requirement of the bridge steel Q500 qE. However, the tensile strength Rm (MPa) of the electrode: more than or equal to 600, yield strength Rp0.2 (MPa): not less than 500, and can not meet the welding strength requirement of Q690 coating-free steel for bridges.
How to develop a composition, a coating, a bridge steel welding rod for Q690 coating-free welding and a preparation method thereof, which are suitable for welding Q690 coating-free bridge steel and meet the welding strength requirement of the Q690 coating-free bridge steel, becomes a technical problem to be solved urgently.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a composition, a coating, a Q690 coating-free bridge steel welding rod and a preparation method thereof, wherein the Q690 coating-free bridge steel welding rod has good welding process performance and mechanical property, the mechanical property meets technical indexes, and the Q690 coating-free bridge steel welding rod has strong stability.
In a first aspect of the present invention, a composition is provided, wherein the composition comprises the following components by mass: CaCO3：9.5～11.5％，CaF2：4～5％，TiO2：1～2％，SiO2: 1-2%, Mn: 1.25-1.5%, ferrosilicon powder: 0.8-1.20%, ferromolybdenum powder: 0.6-0.675%, C: 0.025-0.05%, Cr: 0.05-0.50%, Cu: 0.2-0.3%, Fe: 1.3-1.5% of Na2CO3: 0.1-0.15%, sodium carboxymethylcellulose: 0.1-0.15%, sodium alginate: 0.15-0.20%, Ni: 1.7 to 1.9 percent.
In some embodiments, the CaCO3：9.5％，CaF2：4.5％，TiO2：1.25％，SiO2: 1.5%, Mn: 1.25%, ferrosilicon powder: 0.85%, ferromolybdenum powder: 0.65%, C: 0.030%, Cr: 0.10%, Cu: 0.25%, Fe: 1.35% of Na2CO3: 0.15%, sodium carboxymethyl cellulose: 0.1%, sodium alginate: 0.15%, Ni: 1.7 percent.
In some embodiments, the CaCO3：10.5％，CaF2：4.5％，TiO2：1.5％，SiO2: 1.75%, Mn: 1.25%, ferrosilicon powder: 0.9%, ferromolybdenum powder: 0.625%, C: 0.025%, Cr: 0.2%, Cu: 0.25%, Fe: 1.4% of Na2CO3: 0.1%, sodium carboxymethyl cellulose: 0.1%, sodium alginate: 0.15%, Ni: 1.8 percent.
In some embodiments, the CaCO3：10.5％，CaF2：4.5％，TiO2：1.5％，SiO2: 1.75%, Mn: 1.5%, ferrosilicon powder: 1.1%, ferromolybdenum powder: 0.675%, C: 0.025%, Cr: 0.2%, Cu: 0.25%, Fe: 1.4% of Na2CO3: 0.1%, sodium carboxymethyl cellulose: 0.1%, sodium alginate: 0.15%, Ni: 1.7 percent.
In a second aspect of the invention, a coating is provided, wherein the coating is a coating film formed by coating and curing the composition.
In a third aspect of the present invention, there is provided a Q690 coating-free bridge steel welding rod, comprising a core wire and the coating applied on the surface of the core wire, wherein the core wire comprises the following components by mass: c: 0.04-0.08%, Mn: 0.3-0.6%, Si: 0.01-0.03%, S is less than or equal to 0.005%, P is less than or equal to 0.008%, and the balance is Fe and inevitable impurities.
In some embodiments, the mass ratio of the coating to the welding rod is 25-27: 100.
in a third aspect of the present invention, there is provided a method for preparing the Q690 coating-free bridge steel welding rod, the method comprising:
obtaining said composition;
uniformly mixing the bonding liquid with the composition to obtain a mixed liquid;
and coating the mixed solution on the core wires, and baking to obtain the Q690 coating-free bridge steel welding rod.
In some embodiments, the mass ratio of the composition to the bonding fluid is 100: 20-24; the binding liquid is water glass.
In some embodiments, the coating the mixed solution on the core wires specifically includes: feeding the mixed solution into a welding rod coating machine to coat the welding rod on the welding core according to the pressure of 14-16 MPa; the baking comprises the following steps: baking the mixture for 4 to 6.5 hours at 85 to 90 ℃, and then baking the mixture for 1 to 2 hours at 350 to 400 ℃.
According to one or more technical solutions in the embodiments of the present invention, at least the following technical effects or advantages are provided:
the invention provides a composition, a coating, a Q690 coating-free bridge steel welding rod and a preparation method thereof, wherein CaCO is added into the coating component3、CaF2、TiO2、SiO2The welding rod has excellent mechanical performance and welding technological performance, and the welding rod has proper deposited metal chemical components and excellent mechanical performance by adding Mn, Si-Fe powder, Mo-Fe powder, graphite C, etc. and sodium carbonate Na2CO3The sodium carboxymethylcellulose and the sodium alginate ensure the production process performance of the welding rod and improve the press coating performance of the welding rod. The aim of the invention is realized by organically combining the components of the coating and matching the components of the carbon steel core wire. The invention adopts microalloyingThe effect of combining grain refinement and precipitation strengthening is achieved, the deformation temperature and deformation of the welding metallurgy slag system are optimized microscopically and macroscopically, and the toughness of the deposited metal reaches a better level by dislocation strengthening. The Q690 coating-free steel welding rod for the bridge has good welding process performance and mechanical property, the mechanical property meets technical indexes, and the welding rod has strong stability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a preparation method of a zirconium-titanium binary modified epoxy anticorrosive paint provided by the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be obtained by an existing method.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to a typical embodiment of the present invention, there is provided a composition, the components of which are as followsThe mass fraction is as follows: CaCO3：9.5～11.5％，CaF2：4～5％，TiO2：1～2％，SiO2: 1-2%, Mn: 1.25-1.5%, ferrosilicon powder: 0.8-1.20%, ferromolybdenum powder: 0.6-0.675%, C: 0.025-0.05%, Cr: 0.05-0.50%, Cu: 0.2-0.3%, Fe: 1.3-1.5% of Na2CO3: 0.1-0.15%, sodium carboxymethylcellulose: 0.1-0.15%, sodium alginate: 0.15-0.20%, Ni: 1.7 to 1.9 percent.
In the present embodiment, it is preferred that,
in the invention, the components have the following functions:
CaCO3: 9.5-11.5% of CaCO used in the welding rod3Decomposing into CaO and CO under the action of arc heat2The slag-building gas-forming material is a common slag-building gas-forming material in the manufacturing of welding rods, improves the alkalinity of slag, improves the purity of deposited metal, reduces the amount of impurities, stabilizes electric arc, increases the interfacial tension and surface tension of the slag and metal, and improves slag removal; too little addition is difficult to play a role, too much addition results in poor welding process performance.
CaF2: 4-5%, the melting point and viscosity of the molten slag can be adjusted, the fluidity of the molten slag is increased, the physical properties of the molten slag are improved, the molten slag plays a key role in weld forming, slag removal and the like, and the molten slag is also a main material for reducing diffusible hydrogen in a weld, but due to the existence of fluorine, electric arcs are unstable, toxic gas is generated, and therefore the electric arcs are controlled to be 4-5%.
TiO2：1～2％，TiO2The function of the method is mainly arc stabilization and slag making, the melting point, viscosity, surface tension and fluidity of the slag can be adjusted, the weld forming is improved, and the splashing is reduced; plays a key role in weld forming and electric arc stability; too little addition is difficult to play a role, too much addition dilutes a molten pool, is not beneficial to all-position welding, and simultaneously, the mechanical property is reduced.
SiO2: 1-2% of the silicon powder, which mainly plays a role in slagging and gas making, and 1-2% of the silicon powder is added, so that the stability of the electric arc can be improved; too little addition is difficult to play a role, and too much addition reduces the mechanical properties.
Mn: 1.25-1.5%, the manganese metal can play a role in desulfurization and deoxidation, and can also transfer manganese elements to the welding line, so that the welding line strength is improved; too little addition is difficult to work, and too much addition increases the tensile strength and deteriorates the toughness.
Silicon iron powder: 0.8-1.20%, silicon is an important deoxidizer and is also an important alloying agent of the weld metal, the silicon can reduce the oxygen content of the weld metal and improve the impact toughness of the weld metal, but the opposite is true when the silicon is too high, so that the silicon is controlled to be 0.8-1.20%; the effect is better by adopting the ferrosilicon powder to perform combined deoxidation, and Si in the ferrosilicon powder accounts for 40-50% of the ferrosilicon powder by mass; the reason for this is that: if the Si content is too high or too low, the mechanical properties of the deposited metal are not good.
And (3) molybdenum iron powder: 0.6-0.675%, molybdenum can obviously improve the strength of the weld metal and has the function of refining crystal grains, and proper ferromolybdenum can improve the strength, hardness and thermal stability of the weld; however, too high will affect the toughness of the weld metal, so it is controlled to be 0.6-0.675%. In the ferromolybdenum powder, the mass fraction of Mo in the ferromolybdenum is 50-60%; the reason for this is that: if the Mo content is too high or too low, the mechanical properties of the deposited metal are not good.
C: 0.025-0.05%, wherein C is an element which is strictly controlled by carbon steel and low alloy steel, can obviously improve the strength of deposited metal, and is added to influence the toughness of weld metal too much, so that the content of C is controlled to be 0.025-0.05%.
Fe: 1.3-1.5%, the reduced iron powder is the main component of carbon steel, and the addition of the reduced iron powder improves the deposition efficiency of the welding rod and improves the welding process performance.
Na2CO3: 0.1-0.15%, sodium carboxymethylcellulose: 0.1-0.15%, sodium alginate: 0.15-0.20%, and jointly improves the press coating performance of the welding rod.
Ni: 1.7-1.9%, wherein nickel is an important element for improving the toughness of deposited metal of the low-alloy high-strength steel welding rod, the performance of the low-alloy high-strength steel welding rod cannot be guaranteed when the nickel is too low, and the tendency of heat cracking of a welding line is increased when the nickel is too high.
CaCO is added into the coating component3、CaF2、TiO2、SiO2And the components are reasonably proportionedThe proportion ensures that the welding rod obtains good mechanical property and welding process property, the components of manganese metal Mn, ferrosilicon powder, ferromolybdenum powder, graphite C and the like are added to ensure that the welding rod obtains proper deposited metal chemical components to obtain good mechanical property, and sodium carbonate Na is added2CO3The sodium carboxymethylcellulose and the sodium alginate ensure the production process performance of the welding rod and improve the press coating performance of the welding rod.
In some embodiments, the CaCO3：9.5％，CaF2：4.5％，TiO2：1.25％，SiO2: 1.5%, Mn: 1.25%, ferrosilicon powder: 0.85%, ferromolybdenum powder: 0.65%, C: 0.030%, Cr: 0.10%, Cu: 0.25%, Fe: 1.35% of Na2CO3: 0.15%, sodium carboxymethyl cellulose: 0.1%, sodium alginate: 0.15%, Ni: 1.7 percent.
In some embodiments, the CaCO3：10.5％，CaF2：4.5％，TiO2：1.5％，SiO2: 1.75%, Mn: 1.25%, ferrosilicon powder: 0.9%, ferromolybdenum powder: 0.625%, C: 0.025%, Cr: 0.2%, Cu: 0.25%, Fe: 1.4% of Na2CO3: 0.1%, sodium carboxymethyl cellulose: 0.1%, sodium alginate: 0.15%, Ni: 1.8 percent.
In some embodiments, the CaCO3：10.5％，CaF2：4.5％，TiO2：1.5％，SiO2: 1.75%, Mn: 1.5%, ferrosilicon powder: 1.1%, ferromolybdenum powder: 0.675%, C: 0.025%, Cr: 0.2%, Cu: 0.25%, Fe: 1.4% of Na2CO3: 0.1%, sodium carboxymethyl cellulose: 0.1%, sodium alginate: 0.15%, Ni: 1.7 percent.
According to another exemplary embodiment of the present invention, a coating is provided, wherein the coating is a coating film formed by coating and curing the composition.
According to another exemplary embodiment of the invention, a Q690 coating-free bridge steel electrode is provided, which comprises a core wire and the coating applied to the surface of the core wire, wherein the core wire comprises the following components in percentage by mass: c: 0.04-0.08%, Mn: 0.3-0.6%, Si: 0.01-0.03%, S is less than or equal to 0.005%, P is less than or equal to 0.008%, and the balance is Fe and inevitable impurities.
The reason why the core wire is made of the components is as follows: the lower S, P content of the core wire can ensure that the deposited metal has lower impurities, reduce the generation tendency of hot and cold cracks and improve the toughness of the welding seam.
The invention ensures that the welding rod obtains good technological property and mechanical property by the proportion of the welding core component and the coating component, and obtains deposited metal with high purity. Meanwhile, the aim of the invention is realized by organically combining the components of the coating and matching the coating with the carbon steel core wire. The invention adopts micro-alloying to achieve the effect of combining grain refinement and precipitation strengthening, optimizes the deformation temperature and deformation amount of the welding metallurgy slag system from the micro and macro, and utilizes dislocation strengthening to enable the toughness of the deposited metal to reach a better level.
In some embodiments, the mass ratio of the coating to the welding rod is 25-27: 100. the mass ratio of the coated electrode is too low to achieve the transition effect of alloy elements, and too high causes poor process performance and reduced mechanical property.
According to another exemplary embodiment of the present invention, there is provided a method for preparing the Q690 coating-free bridge steel electrode, as shown in fig. 1, the method comprising:
s1, obtaining the composition;
s2, uniformly mixing the bonding liquid and the composition to obtain a mixed liquid;
and S3, coating the mixed solution on the core wire, and baking to obtain the Q690 coating-free bridge steel welding rod.
In the present embodiment, the first and second embodiments are described,
in the step S2, the mass ratio of the composition to the binder is 100: 20-24; the proportion is too low, wet powder is dry, eccentricity in the production process is not well controlled, the coating is tight, and alloy elements can be increased; too high, wet powder is too wet, production pressure is not enough, and the survival rate of finished products is not high.
The binding liquid is water glass.
In the step S3, in the above step,
coating the mixed solution on the core wire, which specifically comprises: feeding the mixed solution into a welding rod coating machine to coat the welding rod on the welding core according to the pressure of 14-16 MPa; better coating cure is possible with pressures in this range.
The baking comprises the following steps: baking the mixture for 4 to 6.5 hours at 85 to 90 ℃, and then baking the mixture for 1 to 2 hours at 350 to 400 ℃.
The Q690 coating-free steel welding rod for the bridge is matched with Q690 coating-free steel for the bridge for use. The welding rod is adopted to weld Q690 bridge steel without coating, the welding is carried out in the vertical upward direction, the welding heat input is 30-35KJ/cm, the tensile strength of normal-temperature deposited metal is more than or equal to 810Mpa, the yield strength is more than or equal to 690Mpa, the elongation is more than or equal to 15 percent, and the impact at 40 ℃ is more than or equal to 54J; the welding process has the advantages of effectively improving the overall performance of the welding line, along with good welding process performance, stable electric arc, small splashing, attractive welding line forming and good slag removal. The preparation method is simple and convenient to operate.
A composition, a coating, a Q690 coating-free bridge steel electrode, and a method for manufacturing the same according to the present application will be described in detail with reference to examples and experimental data.
S1, obtaining a composition; the ingredients of the compositions of each group are shown in table 1 in weight fraction.
TABLE 1
S2, uniformly mixing the bonding liquid and the composition to obtain a mixed liquid; the binding liquid is water glass (Baume concentration is 41.3-41.7 degrees Be) with the ratio of potassium to sodium being 1:1, the binding liquid accounts for 22.0 percent of the total mass content of the combination, and stirring is carried out for 10-15min at the temperature of 20 ℃ during uniform mixing.
And S3, coating the mixed solution on the core wire, and then baking (baking at a low temperature of 85 ℃ for 3.5-4 h and baking at a high temperature of 380 ℃ for 1.5h) to obtain the Q690 coating-free bridge steel welding rod. The chemical compositions of the core wires of each group are shown in table 2 in terms of mass fraction, and the balance is Fe and inevitable impurities.
TABLE 2
When the welding rod (direct current reverse welding) obtained by the embodiment is used for a welding test, the electric arc is stable, the splashing is small, the molten pool is clear and regular, the slag removal performance is good, and the welding seam is attractive in shape. Vertical upward welding is adopted, and the welding heat input is 30-35 KJ/cm.
TABLE 3 mechanical Properties of deposited metals for various groups of electrodes
From the data in table 3, it can be seen that:
in the embodiments 1-5 of the invention, the Q690 coating-free steel welding rod for the bridge has good welding process performance and mechanical property, the mechanical property meets technical indexes, and the welding rod has strong stability. The welding rod is adopted to weld Q690 bridge steel without coating, the welding is carried out in the vertical upward direction, the welding heat input is 30-35KJ/cm, the tensile strength of normal-temperature deposited metal is more than or equal to 810Mpa, the yield strength is more than or equal to 690Mpa, the elongation is more than or equal to 15 percent, and the impact at 40 ℃ is more than or equal to 54J; the welding process has the advantages of effectively improving the overall performance of the welding line, along with good welding process performance, stable electric arc, small splashing, attractive welding line forming and good slag removal. The preparation method is simple and convenient to operate.
From the above data, it can be seen that the components of the composition of the present invention cooperate synergistically, and any one of the components is not within the scope of the present invention, which is difficult to solve the technical problems of the present invention; specifically, the method comprises the following steps: CaCO is added into the coating component3、CaF2、TiO2、SiO2The welding rod has excellent mechanical performance and welding technological performance, and the welding rod has proper deposited metal chemical components and excellent mechanical performance by adding Mn, Si-Fe powder, Mo-Fe powder, graphite C, etc. and sodium carbonate Na2CO3The sodium carboxymethylcellulose and the sodium alginate ensure the production process performance of the welding rod and improve the press coating performance of the welding rod.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The utility model provides a Q690 exempts from to coat with bridge steel electrode, its characterized in that, the electrode includes the core wire and coats in the coating on core wire surface, the coating is by the composition through the tunica adventitia that coating, solidification formed, the component of composition is by the mass fraction: CaCO3：9.5～11.5％，CaF2：4～5％，TiO2：1～2％，SiO2: 1-2%, Mn: 1.25-1.5%, ferrosilicon powder: 0.8-1.20%, ferromolybdenum powder: 0.6-0.675%, C: 0.025-0.05%, Cr: 0.05 to 0.50% of Cu：0.2～0.3％，Fe：1.3～1.5％，Na2CO3: 0.1-0.15%, sodium carboxymethylcellulose: 0.1-0.15%, sodium alginate: 0.15-0.20%, Ni: 1.7-1.9%, the tensile strength of normal temperature deposited metal suitable for the welding rod is more than or equal to 810Mpa, the yield strength is more than or equal to 690Mpa, the elongation is more than or equal to 15%, and the impact at-40 ℃ is more than or equal to 54J.
2. The Q690 coating-free bridge steel welding rod according to claim 1, wherein: CaCO3：9.5％，CaF2：4.5％，TiO2：1.25％，SiO2: 1.5%, Mn: 1.25%, ferrosilicon powder: 0.85%, ferromolybdenum powder: 0.65%, C: 0.030%, Cr: 0.10%, Cu: 0.25%, Fe: 1.35% of Na2CO3: 0.15%, sodium carboxymethyl cellulose: 0.1%, sodium alginate: 0.15%, Ni: 1.7 percent.
3. The Q690 coating-free bridge steel welding rod according to claim 1, wherein: CaCO3：10.5％，CaF2：4.5％，TiO2：1.5％，SiO2: 1.75%, Mn: 1.25%, ferrosilicon powder: 0.9%, ferromolybdenum powder: 0.625%, C: 0.025%, Cr: 0.2%, Cu: 0.25%, Fe: 1.4% of Na2CO3: 0.1%, sodium carboxymethyl cellulose: 0.1%, sodium alginate: 0.15%, Ni: 1.8 percent.
4. The Q690 coating-free bridge steel welding rod according to claim 1, wherein: CaCO3：10.5％，CaF2：4.5％，TiO2：1.5％，SiO2: 1.75%, Mn: 1.5%, ferrosilicon powder: 1.1%, ferromolybdenum powder: 0.675%, C: 0.025%, Cr: 0.2%, Cu: 0.25%, Fe: 1.4% of Na2CO3: 0.1%, sodium carboxymethyl cellulose: 0.1%, sodium alginate: 0.15%, Ni: 1.7 percent.
5. The Q690 coating-free bridge steel welding rod according to claim 1, wherein the composition of the core wire is, in mass fraction: c: 0.04-0.08%, Mn: 0.3-0.6%, Si: 0.01-0.03%, S is less than or equal to 0.005%, P is less than or equal to 0.008%, and the balance is Fe and inevitable impurities.
6. The Q690 coating-free bridge steel welding rod according to claim 1, wherein the mass ratio of the flux coating to the welding rod is 25-27: 100.
7. a method of making the Q690 coating-free bridge steel electrode of any one of claims 1 to 6, said method comprising:
obtaining a composition;
uniformly mixing the bonding liquid with the composition to obtain a mixed liquid;
and coating the mixed solution on the core wires, and baking to obtain the Q690 coating-free bridge steel welding rod.
8. The method for preparing a Q690 coating-free bridge steel welding rod according to claim 7, wherein the mass ratio of the composition to the binding liquid is 100: 20-24; the binding liquid is water glass.
9. The method for preparing the Q690 coating-free bridge steel welding rod according to claim 7, wherein the step of coating the mixed solution on the core wire specifically comprises: feeding the mixed solution into a welding rod coating machine to coat the welding rod on the welding core according to the pressure of 14-16 MPa; the baking comprises the following steps: baking the mixture for 4 to 6.5 hours at 85 to 90 ℃, and then baking the mixture for 1 to 2 hours at 350 to 400 ℃.
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| FR2988736B1 (en) * | 2012-04-02 | 2014-03-07 | Onera (Off Nat Aerospatiale) | PROCESS FOR OBTAINING A NICKEL ALUMINUM COATING ON A METALLIC SUBSTRATE, AND PART HAVING SUCH A COATING |
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