CN112643250B - Welding rod for 55 kg-grade weathering steel and application thereof - Google Patents
Welding rod for 55 kg-grade weathering steel and application thereof Download PDFInfo
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- CN112643250B CN112643250B CN202011428867.9A CN202011428867A CN112643250B CN 112643250 B CN112643250 B CN 112643250B CN 202011428867 A CN202011428867 A CN 202011428867A CN 112643250 B CN112643250 B CN 112643250B
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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
- B23K35/22—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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
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Abstract
The invention provides a welding rod for 55 kg-grade weathering steel, which comprises a core wire and a coating coated on the surface of the core wire, wherein the coating is formed by mixing dry powder and an adhesive, and the dry powder in the coating comprises the following components in percentage by mass of the total dry powder: 35-40% of marble, 15-20% of fluorite, 3-5% of zircon sand, 3-8% of rutile, 2-4% of quartz, 3-6% of ferrosilicon, 5-8% of manganese metal, 4-8% of nickel powder, 1-3% of chromium metal, 1-3% of copper powder, 0.5-1.0% of soda and the balance of Fe. According to the invention, a proper amount of Ni, Cr, Cu and other alloy elements are transferred from the coating to the deposited metal, so that the welding metal has excellent weather resistance, and the weather resistance index I can be more than 6.5; meanwhile, the contents of Mn, Si, C and other alloy elements in the weld metal are controlled by adjusting the components of the coating, so that the tensile strength of the deposited metal is higher than 550MPa, the elongation is more than 22 percent, and the low-temperature impact absorption energy at minus 40 ℃ is more than 60J.
Description
Technical Field
The invention belongs to the technical field of welding materials, and particularly relates to a welding rod for 55 kg-grade weathering steel and application thereof.
Background
The weathering steel has the capability of resisting atmospheric corrosion because a compact and stable protective oxide film is gradually formed on the surface in the using process of the weathering steel, and the oxide film prevents a corrosion medium from further permeating into the steel, so that the corrosion rate is greatly reduced. Corrosion not only causes damage to the structure, but also increases burdensome management and maintenance burden, and meanwhile, a large amount of manpower and capital are consumed for periodic coating. The trend of the resource-saving and environment-friendly society is that the demand for adopting weathering steel on structures such as bridge construction is higher and higher, and the development of welding materials matched with the weathering steel is more and more urgent.
At present, the corrosion-resistant steel welding rods on the market are few in variety, unstable in mechanical property and uneven in weather resistance. The corrosion resistance index I of weld metal is regulated to be not lower than 6.0 by referring to AWSD1.5, and at present, the weather resistance of a welding rod matched with weather-resistant steel with the tensile strength of 55 kilograms is rarely researched.
Disclosure of Invention
The invention aims to provide a welding rod for 55 kg-grade weathering steel, which solves the problem of unstable mechanical property of the existing corrosion-resistant steel welding rod, and ensures the corrosion resistance of the welding rod, so that the weathering index I of the welding rod is not lower than 6.5.
In order to achieve the purpose, the invention adopts the following technical scheme:
the welding rod for 55 kg-grade weathering steel comprises a core wire and a coating coated on the surface of the core wire, wherein the coating is formed by mixing dry powder and an adhesive, and the dry powder in the coating comprises the following components in percentage by mass of the total mass of the dry powder: 35-40% of marble, 15-20% of fluorite, 3-5% of zircon sand, 3-8% of rutile, 2-4% of quartz, 3-6% of ferrosilicon, 5-8% of manganese metal, 4-8% of nickel powder, 1-3% of chromium metal, 1-3% of copper powder, 0.5-1.0% of soda and the balance of Fe.
Further, the core wire is H08A core wire, the mass of the core wire accounts for 65-70% of the total mass of the welding rod, and the mass of the coating accounts for 30-35% of the total mass of the welding rod.
Furthermore, CaO and CaF in the coating 2 The mass ratio of (0.3-0.8): 1; CaO and SiO 2 The mass ratio of (8-12): 1.
further, potassium sodium silicate is adopted as the adhesive.
Specifically, the components of the dry powder in the coating and the percentage of each component in the total mass of the dry powder are as follows: 35% of marble, 20% of fluorite, 5% of zircon sand, 3% of rutile, 4% of quartz, 6% of ferrosilicon, 5% of manganese metal, 8% of nickel powder, 3% of chromium metal, 2% of copper powder, 0.5% of soda and the balance of Fe.
Specifically, the components of the dry powder in the coating and the percentage of each component in the total mass of the dry powder are as follows: 40% of marble, 15% of fluorite, 3% of zircon sand, 6% of rutile, 2% of quartz, 4% of ferrosilicon, 6% of manganese metal, 7% of nickel powder, 1.5% of metal chromium, 1.5% of copper powder, 1.0% of soda and the balance of Fe.
Specifically, the components of the dry powder in the coating and the percentage of each component in the total mass of the dry powder are as follows: 36% of marble, 18% of fluorite, 4% of zircon sand, 5% of rutile, 3% of quartz, 3% of ferrosilicon, 8% of manganese metal, 4.5% of nickel powder, 1% of chromium metal, 3% of copper powder, 0.8% of soda and the balance of Fe.
Specifically, the components of the dry powder in the coating and the percentage of each component in the total mass of the dry powder are as follows: 37% of marble, 17% of fluorite, 4% of zircon sand, 7% of rutile, 2.5% of quartz, 5% of ferrosilicon, 6% of manganese metal, 6% of nickel powder, 2% of metal chromium, 1% of copper powder, 0.7% of soda and the balance of Fe.
Specifically, the components of the dry powder in the coating and the percentage of each component in the total mass of the dry powder are as follows: 38% of marble, 16% of fluorite, 3.5% of zircon sand, 8% of rutile, 2% of quartz, 4% of ferrosilicon, 7% of manganese metal, 5% of nickel powder, 1.5% of chromium metal, 2% of copper powder, 0.8% of soda and the balance of Fe.
When the welding rod for the 55 kg-level weathering steel provided by the invention is used for welding, a direct current reverse connection type power supply is adopted for welding operation, the welding current is 160A, and the welding speed is 25.7 cm/min.
The design principle of the formula of the traditional Chinese medicine coating of the welding rod for 55 kg-grade weathering steel is as follows:
the traditional Chinese medicine coating adopts CaO-CaF 2 -TiO 2 -SiO 2 The basic slag system can better deoxidize, dehydrogenate and desulfurize, has more stable performance, and determines the basic components and content of the coating through a large number of tests to improve the process performance of the basic welding rod.
A small amount of quartz is added into the coating, because SiO in the quartz 2 The content of the (C) is higher, the alkalinity of the slag can be properly reduced, the fluidity of the slag is improved, the weld joint can be more attractive in forming, and the slag can be more easily removed. In order to improve the press coating performance of the welding rod, a small amount of soda ash is added into the coating to increase the lubricity of the coating. In order to improve the low-temperature impact toughness of weld metal, ferrosilicon and manganese metal are added into the coating for deoxidation, so that the oxygen content in the weld is reduced, and the harm of oxide inclusions to the low-temperature impact toughness is reduced; the Ni element can reduce the low-temperature brittle transition temperature and is very favorable for improving the low-temperature impact toughness. In order to improve the corrosion resistance, copper powder and metal chromium powder are added into the coating, and Cr can form on the surface of steelThe dense oxide film promotes the electrode potential, generates a passivation effect, improves the corrosion resistance of the steel, increases the Cu content, has a certain refining effect on corrosion product particles, is beneficial to improving the compactness of a rust layer, effectively reduces the average corrosion depth and the corrosion rate of the weathering steel, and is beneficial to improving the corrosion resistance of the steel.
In addition, the invention is characterized in that CaO and CaF in the coating are treated 2 、SiO 2 The proportion control ensures the welding process performance of the welding rod, namely when CaO and CaF are generated 2 The ratio of (0.3-0.8): 1, the electric arc is soft and has small splashing, and the welding can be carried out at all positions; on CaO and SiO 2 The ratio of (8-12): 1, the molten pool has good fluidity and good air permeability, and is not easy to generate air holes.
The invention has the beneficial effects that:
(1) the welding rod for the 55 kg-grade weathering steel provided by the invention has the advantages that a proper amount of Ni, Cr, Cu and other alloy elements are transferred to deposited metal through a coating, so that the welded metal has excellent weather resistance, and the weather resistance index I can be more than 6.5.
(2) The welding rod for 55 kg-grade weathering steel provided by the invention controls the contents of Mn, Si, C and other alloy elements in weld metal by adjusting the components of the coating, ensures that the tensile strength of deposited metal is higher than 550MPa, the elongation is more than 22%, and the low-temperature impact absorption energy at minus 40 ℃ is more than 60J.
(3) The welding rod for the 55 kg-grade weathering steel provided by the invention can be used for all-position welding, and has excellent welding process performance and attractive weld joint formation.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment, the mass of a welding core adopted by the welding rod for 55 kg-grade weathering steel accounts for 65-70% of the total mass of the welding rod, and the mass of a coating accounts for 30-35% of the total mass of the welding rod; the core wire adopts an H08A core wire, and the dry powder component proportion adopted by the coating in the corresponding embodiment is shown in Table 1, when the welding rod is manufactured, according to the manufacturing method of a common alkaline low-hydrogen welding rod, potassium sodium water glass is used as a bonding agent, and the uniformly mixed coating is uniformly pressed and coated on the surface of the core wire to manufacture the welding rod with the diameter of 4.0 mm.
Table 1: composition of dry powder in coating of each example (mass percent)%)
| Composition of dry powder | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Marble, method for producing the same and marble plate | 35 | 40 | 36 | 37 | 38 |
| Fluorite | 20 | 15 | 18 | 17 | 16 |
| Zircon sand | 5 | 3 | 4 | 4 | 3.5 |
| Rutile type | 3 | 6 | 5 | 7 | 8 |
| Quartz | 4 | 2 | 3 | 2.5 | 2 |
| Silicon iron | 6 | 4 | 3 | 5 | 4 |
| Manganese metal | 5 | 6 | 8 | 6 | 7 |
| Nickel powder | 8 | 7 | 4.5 | 6 | 5 |
| Metallic chromium | 3 | 1.5 | 1.0 | 2.0 | 1.5 |
| Copper powder | 2 | 1.5 | 3.0 | 1.0 | 2.0 |
| Soda ash | 0.5 | 1.0 | 0.8 | 0.7 | 0.8 |
| Iron powder | 8.5 | 13 | 13.7 | 11.8 | 12.2 |
The physical and chemical properties of deposited metal were tested on 5 welding rods made of the welding rod powder of the above 5 examples, and the groove, size, sampling method and position of the test plate were all performed according to the Chinese national standard GB/T5117 "non-alloy steel and fine grain steel welding rod". And (3) adopting a direct-current reverse connection type power supply to carry out welding operation, wherein the welding current is 160A, and the welding speed is 25.7 cm/min.
The chemical components, weather resistance index I and mechanical properties of the deposited metal of the welding rod prepared in each example are shown in tables 2 and 3, wherein the weather resistance index I is calculated according to the following formula, and the chemical components are the chemical component contents of the deposited metal:
I＝26.01(％Cu)+3.88(％Ni)+1.20(％Cr)+1.48(％Si)+17.28(％P)-7.29(％Cu)×(％Ni)-9.10(％Ni)×(％P)-33.39(％Cu) 2 。
table 2: chemical components (mass percent) of deposited metal and weather resistance index I
Table 3: mechanical properties of deposited metal
In conclusion, the welding rod for the 55 kg-grade weathering steel provided by the invention has the advantages that a proper amount of Ni, Cr, Cu and other alloy elements are transferred to deposited metal through the flux coating, so that the welded metal has excellent weather resistance, and the weather resistance index I can be more than 6.5; meanwhile, the contents of Mn, Si, C and other alloy elements in the weld metal are controlled by adjusting the components of the coating, so that the tensile strength of the deposited metal is higher than 550MPa, the elongation is more than 22 percent, and the low-temperature impact absorption energy at minus 40 ℃ is more than 60J.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (9)
1. The welding rod for 55 kg-grade weathering steel comprises a core wire and a coating coated on the surface of the core wire, and is characterized in that the coating is formed by mixing dry powder and an adhesive, and the components of the dry powder and the percentages of the components in the coating in the total mass of the dry powder are as follows:35-40% of marble, 15-20% of fluorite, 3-5% of zircon sand, 3-8% of rutile, 2-4% of quartz, 3-6% of ferrosilicon, 5-8% of manganese metal, 4-8% of nickel powder, 1-3% of chromium metal, 1-3% of copper powder, 0.5-1.0% of soda ash and the balance of Fe; CaO and CaF in the coating 2 The mass ratio of (0.3-0.8): 1; CaO and SiO 2 The mass ratio of (8-12): 1.
2. the welding rod for the 55 kg-grade weathering steel as claimed in claim 1, characterized in that the core wire is H08A core wire, the core wire accounts for 65-70% of the total mass of the welding rod, and the coating accounts for 30-35% of the total mass of the welding rod.
3. The welding electrode for weathering steel of 55 kg grade as claimed in claim 1, wherein the binder is potassium sodium water glass.
4. The welding rod for the 55 kg-grade weathering steel according to claim 1, wherein the ingredients of the dry powder in the coating and the percentage of each ingredient to the total mass of the dry powder are as follows: 35% of marble, 20% of fluorite, 5% of zircon sand, 3% of rutile, 4% of quartz, 6% of ferrosilicon, 5% of manganese metal, 8% of nickel powder, 3% of chromium metal, 2% of copper powder, 0.5% of soda and the balance of Fe.
5. The welding rod for the 55 kg-grade weathering steel as claimed in claim 1, characterized in that the components of the dry powder in the coating and the percentage of each component in the total mass of the dry powder are as follows: 40% of marble, 15% of fluorite, 3% of zircon sand, 6% of rutile, 2% of quartz, 4% of ferrosilicon, 6% of manganese metal, 7% of nickel powder, 1.5% of chromium metal, 1.5% of copper powder, 1.0% of soda and the balance of Fe.
6. The welding rod for the 55 kg-grade weathering steel according to claim 1, wherein the ingredients of the dry powder in the coating and the percentage of each ingredient to the total mass of the dry powder are as follows: 36% of marble, 18% of fluorite, 4% of zircon sand, 5% of rutile, 3% of quartz, 3% of ferrosilicon, 8% of manganese metal, 4.5% of nickel powder, 1% of chromium metal, 3% of copper powder, 0.8% of soda and the balance of Fe.
7. The welding rod for the 55 kg-grade weathering steel as claimed in claim 1, characterized in that the components of the dry powder in the coating and the percentage of each component in the total mass of the dry powder are as follows: 37% of marble, 17% of fluorite, 4% of zircon sand, 7% of rutile, 2.5% of quartz, 5% of ferrosilicon, 6% of manganese metal, 6% of nickel powder, 2% of metal chromium, 1% of copper powder, 0.7% of soda and the balance of Fe.
8. The welding rod for the 55 kg-grade weathering steel according to claim 1, wherein the ingredients of the dry powder in the coating and the percentage of each ingredient to the total mass of the dry powder are as follows: 38% of marble, 16% of fluorite, 3.5% of zircon sand, 8% of rutile, 2% of quartz, 4% of ferrosilicon, 7% of manganese metal, 5% of nickel powder, 1.5% of chromium metal, 2% of copper powder, 0.8% of soda ash and the balance of Fe.
9. The use of the welding rod for 55 kg weathering steel as claimed in any of claims 1 to 8, characterized in that the welding rod for 55 kg weathering steel is used for welding with a reverse DC power supply, the welding current is 160A, and the welding speed is 25.7 cm/min.
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| CN112643250B true CN112643250B (en) | 2022-09-06 |
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| JP4598233B2 (en) * | 2000-04-27 | 2010-12-15 | 新日本製鐵株式会社 | Low hydrogen coated arc welding rod for Cu-Ni coastal high weathering steel |
| JP2010110817A (en) * | 2008-10-11 | 2010-05-20 | Kobe Steel Ltd | Low-hydrogen coated electrode |
| CN101905395B (en) * | 2010-07-30 | 2012-09-05 | 西安理工大学 | Low-hydrogen basic electrode for welding FV520 (B) stainless steel |
| CN102248327B (en) * | 2011-06-27 | 2012-12-26 | 天津市金桥焊材集团有限公司 | High-corrosion-resistance, high-strength, high-toughness and high-weather-resistance welding rod |
| CN103624414B (en) * | 2013-11-15 | 2016-02-03 | 武汉铁锚焊接材料股份有限公司 | A kind of welding rod for low-temperature steel welding and preparation method thereof |
| CN103934592B (en) * | 2014-04-18 | 2016-02-10 | 中国电建集团上海能源装备有限公司 | A core wire for up to 55kg weathering steel welding rod, coating and welding rod thereof and preparation method |
| CN106181125B (en) * | 2016-08-30 | 2018-06-19 | 四川大西洋焊接材料股份有限公司 | Exempt from application bridge steel high-performance weather-proof steel welding rod and preparation method thereof |
| CN108080814A (en) * | 2017-12-22 | 2018-05-29 | 重庆瑜煌电力设备制造有限公司 | A kind of weathering steel welding rod and preparation method thereof |
| CN108907494B (en) * | 2018-06-01 | 2021-01-05 | 四川大西洋焊接材料股份有限公司 | Nuclear power AG728 steel welding rod and preparation method thereof |
| CN110802342B (en) * | 2019-12-03 | 2021-01-01 | 四川西冶新材料股份有限公司 | High-strength weathering steel Q550NQR1 and Q550qNH matched welding rod |
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