CN108907505B - Special welding wire for Q550MPa high-strength steel and preparation method thereof - Google Patents
Special welding wire for Q550MPa high-strength steel and preparation method thereof Download PDFInfo
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- CN108907505B CN108907505B CN201811036084.9A CN201811036084A CN108907505B CN 108907505 B CN108907505 B CN 108907505B CN 201811036084 A CN201811036084 A CN 201811036084A CN 108907505 B CN108907505 B CN 108907505B
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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
- B23K35/308—Fe as the principal constituent with Cr as next major 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
- B23K35/40—Making wire or rods for soldering or welding
Abstract
The invention discloses a special welding wire for Q550MPa high-strength steel and a preparation method thereof, wherein the welding wire consists of a sheath steel belt and a flux core, and the flux core consists of the following components in percentage by weight: 3-5 parts of fluoride, 8-15 parts of ferrosilicon powder, 2-5 parts of aluminum iron powder, 10-15 parts of manganese iron powder, 8-12 parts of nickel powder, 1-5 parts of potassium titanate, 2-10 parts of fused magnesia, 5-15 parts of ferromolybdenum, 2-5 parts of feldspar powder, 10-20 parts of metal chromium and 20-30 parts of iron powder. Compared with the prior art, the invention has the advantages of good welding process performance, stable electric arc, small splashing, beautiful welding line formation and the like; the strength is matched, and the performance reaches the purpose of good low-temperature impact toughness at minus 40 ℃.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to a welding wire special for Q550MPa high-strength steel, a preparation method and a welding method.
Background
Q550 steel means high-strength steel having a yield strength of 550 MPa. The electrogas welding is a special flux-cored wire for full-automatic control lifting system gas distribution electrogas welding and uses CO2The gas shield performs vertical butt welding to weld the welding joint at a vertical position or a position close to the vertical position. The axial direction of the electric arc is vertical to the weld penetration direction, a water-cooled copper slide block is adopted on the front side of the weld during welding, a water-cooled gear row (or liner) is adopted on the back side of the weld, the flux-cored wire is fed into a groove formed by a weldment and the gear block, the four sides of a molten pool are restrained, one-time forming of the two sides of a single-side welding is realized, and the welding device and the welding method are efficient welding technology and equipment. At present, the base material used by the electrogas welding is mostly in the grade of Q345, and no welding material matched with Q550 exists.
CN106475706A discloses a coating-free weather-resistant flux-cored wire for bridge steel and a preparation method thereof, the wire is composed of a steel sheath and a powder core, and the powder core comprises the following components: 2-8 wt% of ferroboron, 0.01-2 wt% of ferromolybdenum, 1-6 wt% of fluoride, 1.5-8 wt% of zircon sand, 2-7 wt% of magnesium powder, 2-5 wt% of quartz sand, 2-8 wt% of ferrosilicon, 5-19 wt% of electrolytic manganese, 1-5 wt% of ferromanganese, 1-hot, and 1-hot nickel powder6 percent of chromium metal, 1-8 percent of copper powder, 1-8 percent of ferrotitanium, 2-9 percent of ferrotitanium, 0.1-5 percent of feldspar, 2-8 percent of sodium titanate, 20-40 percent of rutile and the balance of iron powder. When the welding flux is used for coating-free bridge steel welding, the electric arc is stable, the splashing is small, the slag is easy to remove, the weld joint is attractive in forming and suitable for all-position welding, but when the welding flux is used for Q550 high-strength steel and CO2The gas shield carries out vertical butt welding to weld a welding joint at a vertical position or a position close to the vertical position, the welding operation is inconvenient, the electric arc is unstable, the splashing is large, the welding seam forming is poor, and the like, the low-temperature impact toughness at minus 40 ℃ after welding is poor, and the diffusible hydrogen content of deposited metal is more than 10mL/100 g.
The above-mentioned drawbacks are also present in a high strength steel welding powder with thin layer slag protection disclosed in CN 102581520A.
Disclosure of Invention
One of the purposes of the invention is to provide a special welding wire for Q550MPa high-strength steel and a preparation method thereof, and the welding wire has the advantages of good welding process performance, stable electric arc, small splashing, attractive weld forming and the like; the strength is matched, and the performance reaches the purpose of good low-temperature impact toughness at minus 40 ℃.
The technical scheme is as follows: a special welding wire for Q550MPa high-strength steel and a preparation method thereof are disclosed, the welding wire consists of a sheath steel belt and a flux core, and the flux core comprises the following components in percentage by weight: 3-5 parts of fluoride, 8-15 parts of ferrosilicon powder, 2-5 parts of aluminum iron powder, 10-15 parts of manganese iron powder, 8-12 parts of nickel powder, 1-5 parts of potassium titanate, 2-10 parts of fused magnesia, 5-15 parts of ferromolybdenum, 2-5 parts of feldspar powder, 10-20 parts of metal chromium and 20-30 parts of iron powder; the fluoride is calcium fluoride or potassium fluotitanate; the outer skin steel strip comprises the following components: c is more than or equal to 0.02 percent and less than or equal to 0.06 percent, Mn is more than or equal to 0.15 percent and less than or equal to 0.40 percent, Si is more than or equal to 0 and less than or equal to 0.05 percent, S is more than or equal to 0 and less than or equal to 0.010 percent, P is more than or equal to 0 and less than or equal to 0.010 percent, and the balance is Fe and.
Preferably, the weight of the flux core is 20-30% of the weight of the welding wire special for the Q550MPa high-strength steel.
Preferably, the outer skin steel strip comprises the following components: 0.032% of C, 0.22% of Mn, 0.02% of Si, 0.004% of S, 0.08% of P, and the balance Fe and inevitable impurities.
Preferably, the fluoride is 4 parts by weight, the ferrosilicon powder is 10 parts by weight, the ferroaluminum powder is 2 parts by weight, the ferromanganese powder is 12 parts by weight, the nickel powder is 10 parts by weight, the potassium titanate is 3 parts by weight, the fused magnesia is 5 parts by weight, the ferromolybdenum is 10 parts by weight, the feldspar powder is 3 parts by weight, the chromium metal is 12 parts by weight, and the iron powder is 29 parts by weight.
Preferably, the fluoride comprises 3 parts by weight of fluoride, 8 parts by weight of ferrosilicon powder, 2 parts by weight of ferroaluminum powder, 15 parts by weight of ferromanganese powder, 10 parts by weight of nickel powder, 3 parts by weight of potassium titanate, 5 parts by weight of fused magnesia, 10 parts by weight of ferromolybdenum, 3 parts by weight of feldspar powder, 20 parts by weight of chromium metal and 21 parts by weight of iron powder.
Preferably, the diameter of the welding wire special for Q550MPa high-strength steel is phi 1.60 mm.
Preferably, the welding wire special for Q550MPa high-strength steel is used for welding, and the mechanical properties of the welding deposited metal are as follows: the tensile strength is 670-830Mpa, the yield strength is more than or equal to 550Mpa, the elongation is more than or equal to 16 percent, the impact reaches 80J at the temperature of 40 ℃, and the diffusible hydrogen content of deposited metal is less than 10mL/100 g.
The invention also aims to provide a preparation method of the welding wire special for Q550MPa high-strength steel.
The technical scheme is as follows: a preparation method of a Q550MPa high-strength steel special welding wire comprises the following steps:
uniformly mixing all components of the medicine core for later use;
secondly, the sheath is placed in a welding wire forming machine, the flux-cored mixture to be used is injected into a U-shaped sheath groove which is transversely bent, and then the sheath is rolled into a wire and is finely drawn to phi 1.6mm, thus obtaining the Q550MPa high-strength steel special welding wire.
The invention also aims to provide a welding method of Q550MPa high-strength steel.
The technical scheme is as follows: a welding method of Q550MPa high-strength steel adopts the welding wire special for Q550MPa high-strength steel to weld the Q550MPa high-strength steel by electrogas welding, and comprises the following welding parameters: 380-400A, U V, gas flow rate of 20L/min, 100% CO2The linear energy: 100-235 KJ/cm.
The invention principle and the beneficial effects are as follows:
in order to comply with the development of the market, the invention successfully develops the electrogas welding flux-cored wire capable of welding the steel plate with the yield strength of 550 MPa.
In the present invention, the iron powder can improve welding efficiency and supply a small amount of oxygen for arc stabilization, and in order to ensure high deposition efficiency, the iron powder of the present invention is reduced iron powder or atomized iron powder.
The invention achieves the aim by organically combining the flux core components and matching the flux core components with the outer skin of the low-carbon steel belt.
The welding wire can be used for welding high-strength steel plates with the pressure of Q550MPa above 200KJ/cm, and deposited metal after welding: the tensile strength is 670-830Mpa, the yield strength is more than or equal to 550Mpa, the elongation is more than or equal to 16 percent, the impact reaches 80J at the temperature of 40 ℃, and the diffusible hydrogen content of deposited metal is less than 10mL/100 g. Effectively improves the overall performance of the welding line and solves the problems of strength matching with Q500MPa and low-temperature impact toughness at minus 40 ℃. The welding process has good performance, stable electric arc, small splashing and beautiful welding line formation.
Definition and interpretation
Unless otherwise specified, the symbols are mass%.
Unless otherwise specified, all the articles used in the present invention are commercially available products.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
A (width x thickness) 14 x 0.6mm steel strip is used as the sheath of the welding wire, and the welding wire comprises the chemical components of 0.032 wt% of C, 0.22 wt% of Mn, 0.02 wt% of Si, 0.004 wt% of S, 0.08 wt% of P, and the balance of iron and essential impurity elements;
100g of the medicine core is prepared and produced, and the medicine core comprises the following components: 4g of fluoride, 10g of ferrosilicon powder, 2g of aluminum iron powder, 12g of manganese iron powder, 10g of nickel powder, 3g of potassium titanate, 5g of fused magnesia, 10g of ferromolybdenum, 3g of feldspar powder, 12g of metal chromium and the balance of iron powder. Uniformly mixing the components in the medicine core for later use;
the flux core of this example represents 20 wt% of the total wire weight.
And (3) placing the steel strip in a welding wire forming machine, injecting the flux-cored mixture for standby into a U-shaped steel strip groove which is transversely bent, rolling the steel strip into a wire, and finely drawing the wire to phi 1.6 mm.
In the present embodiment, the welding parameters are as follows: 380-380A, U-38V, gas flow 20L/min, 100% CO2The linear energy: 100KJ/cm, and welding base material Q550MPa high-strength steel. The mechanical properties are as follows:
deposited metal chemical composition: is based on
| C | Mn | Si | S | P | Ni | Mo | Cr |
| 0.06 | 1.90 | 0.45 | 0.006 | 0.011 | 1.50 | 0.50 | 0.20 |
The balance of Fe and indispensable impurity elements.
Deposited metal mechanical properties (100% carbon dioxide gas):
content of diffusible hydrogen: 3.8.0mL/100 g.
Example 2
The outer layer of the wire is the same as in example 1.
100g of the medicine core is prepared and produced, and the medicine core comprises the following components: 3g of fluoride, 8g of ferrosilicon powder, 2g of aluminum iron powder, 15g of manganese iron powder, 10g of nickel powder, 3g of potassium titanate, 5g of fused magnesia, 10g of ferromolybdenum, 3g of feldspar powder, 20g of metal chromium and the balance of iron powder. Then, the components in the medicine core are uniformly mixed for standby.
The flux core of this example represents 20 wt% of the total wire weight.
And (3) placing the steel strip in a welding wire forming machine, injecting the flux-cored mixture for standby into a U-shaped steel strip groove which is transversely bent, rolling the steel strip into a wire, and finely drawing the wire to phi 1.6 mm.
In the present embodiment, the welding parameters are as follows: 400-400A, U-40V, gas flow 20L/min, 100% CO2The linear energy: 235KJ/cm, and welding base material Q550MPa high-strength steel. The mechanical properties are as follows:
deposited Metal chemical composition (%)
| C | Mn | Si | S | P | Ni | Mo | Cr |
| 0.06 | 2.10 | 0.38 | 0.006 | 0.011 | 1.50 | 0.50 | 0.38 |
The balance of Fe and indispensable impurity elements.
Deposited metal mechanical properties (mixed gas):
content of diffusible hydrogen: 4.2mL/100 g.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and all equivalent variations and modifications made in the spirit of the present invention are included in the scope of the present invention.
Claims (11)
1. A special welding wire for Q550MPa high-strength steel consists of a sheath steel belt and a flux core, and is characterized in that the flux core consists of the following components in percentage by weight: 3-5 parts of fluoride, 8-15 parts of ferrosilicon powder, 2-5 parts of aluminum iron powder, 10-15 parts of manganese iron powder, 8-12 parts of nickel powder, 1-5 parts of potassium titanate, 2-10 parts of fused magnesia, 5-15 parts of ferromolybdenum, 2-5 parts of feldspar powder, 10-20 parts of metal chromium and 20-30 parts of iron powder; the fluoride is calcium fluoride or/and potassium fluotitanate; the outer skin steel strip comprises the following components: c is more than or equal to 0.02 percent and less than or equal to 0.06 percent, Mn is more than or equal to 0.15 percent and less than or equal to 0.40 percent, Si is more than or equal to 0 and less than or equal to 0.05 percent, S is more than or equal to 0 and less than or equal to 0.010 percent, P is more than or equal to 0 and less than or equal to 0.010 percent, and the balance is Fe and.
2. The welding wire special for Q550MPa high-strength steel as claimed in claim 1, wherein: the weight of the flux core is 20-30% of that of the welding wire special for the Q550MPa high-strength steel.
3. The welding wire special for Q550MPa high-strength steel according to claim 1, wherein the sheath steel strip comprises the following components: 0.032% of C, 0.22% of Mn, 0.02% of Si, 0.004% of S, 0.08% of P, and the balance Fe and inevitable impurities.
4. The welding wire special for Q550MPa high-strength steel as claimed in any one of claims 1 to 3, wherein: 4 parts of fluoride, 10 parts of ferrosilicon powder, 2 parts of ferroaluminum powder, 12 parts of ferromanganese powder, 10 parts of nickel powder, 3 parts of potassium titanate, 5 parts of fused magnesia, 10 parts of ferromolybdenum, 3 parts of feldspar powder, 12 parts of chromium metal and 29 parts of iron powder.
5. The welding wire special for Q550MPa high-strength steel as claimed in any one of claims 1 to 3, wherein: 3 parts of fluoride, 8 parts of ferrosilicon powder, 2 parts of ferroaluminum powder, 15 parts of ferromanganese powder, 10 parts of nickel powder, 3 parts of potassium titanate, 5 parts of fused magnesia, 10 parts of ferromolybdenum, 3 parts of feldspar powder, 20 parts of chromium metal and 21 parts of iron powder.
6. The welding wire special for Q550MPa high-strength steel as claimed in any one of claims 1 to 3, wherein: the diameter of the Q550MPa high-strength steel special welding wire is phi 1.60 mm.
7. The welding wire special for Q550MPa high-strength steel as claimed in any one of claims 1 to 3, wherein: the welding wire special for Q550MPa high-strength steel is used for welding, and the mechanical properties of welding deposited metal are as follows: the tensile strength is 670-830Mpa, the yield strength is more than or equal to 550Mpa, the elongation is more than or equal to 16 percent, the impact reaches 80J at the temperature of 40 ℃, and the diffusible hydrogen content of deposited metal is less than 10mL/100 g.
8. The preparation method of the welding wire special for the Q550MPa high-strength steel as claimed in any one of claims 1 to 3, which comprises the following steps:
uniformly mixing all components of the medicine core for later use;
secondly, the sheath is placed in a welding wire forming machine, the flux-cored mixture to be used is injected into a U-shaped sheath groove which is transversely bent, and then the sheath is rolled into a wire and is finely drawn to phi 1.6mm, thus obtaining the Q550MPa high-strength steel special welding wire.
9. The preparation method of the special welding wire for the Q550MPa high-strength steel as claimed in claim 4, comprising the following steps:
uniformly mixing all components of the medicine core for later use;
secondly, the sheath is placed in a welding wire forming machine, the flux-cored mixture to be used is injected into a U-shaped sheath groove which is transversely bent, and then the sheath is rolled into a wire and is finely drawn to phi 1.6mm, thus obtaining the Q550MPa high-strength steel special welding wire.
10. The preparation method of the welding wire special for the Q550MPa high-strength steel as claimed in claim 5, comprising the following steps:
uniformly mixing all components of the medicine core for later use;
secondly, the sheath is placed in a welding wire forming machine, the flux-cored mixture to be used is injected into a U-shaped sheath groove which is transversely bent, and then the sheath is rolled into a wire and is finely drawn to phi 1.6mm, thus obtaining the Q550MPa high-strength steel special welding wire.
11. A welding method for Q550MPa high-strength steel, which adopts the welding wire special for Q550MPa high-strength steel as claimed in any one of claims 1 to 3 to weld the Q550MPa high-strength steelStrong steel electrogas welding, I380-400A, U V38-40V, gas flow 20L/min, 100% CO2The linear energy: 100-235 KJ/cm.
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| CN201811036084.9A CN108907505B (en) | 2018-09-06 | 2018-09-06 | Special welding wire for Q550MPa high-strength steel and preparation method thereof |
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| CN201811036084.9A CN108907505B (en) | 2018-09-06 | 2018-09-06 | Special welding wire for Q550MPa high-strength steel and preparation method thereof |
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| CN108907505B true CN108907505B (en) | 2020-12-29 |
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| CN110508971B (en) * | 2019-09-12 | 2021-07-20 | 天津市永昌焊丝有限公司 | High-strength high-toughness metal powder core flux-cored wire |
| CN112548398B (en) * | 2020-12-08 | 2022-07-12 | 上海焊接器材有限公司 | Ultralow-hydrogen flux-cored wire for 62 Kg-grade weathering steel and manufacturing method thereof |
| CN112719691B (en) * | 2020-12-22 | 2022-08-16 | 四川大西洋焊接材料股份有限公司 | Flux-cored wire, flux-cored wire and preparation method and application thereof |
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| CN104722962B (en) * | 2015-04-10 | 2016-06-29 | 首钢总公司 | High-strength steel high-strength tenacity gas-shielded flux-cored wire |
| CN106378546B (en) * | 2016-09-18 | 2019-02-19 | 四川大西洋焊接材料股份有限公司 | Stainless steel welding electrode and preparation method thereof for nuclear leve high-pressure cylinder |
| CN106736048B (en) * | 2016-11-29 | 2019-04-19 | 洛阳双瑞特种合金材料有限公司 | A kind of high-strength weathering steel metal powder core pattern seamless flux-cored wire |
| CN106808113B (en) * | 2017-03-03 | 2019-08-06 | 四川大西洋焊接材料股份有限公司 | The mating welding rod of ultra supercritical material C B2 steel and preparation method thereof suitable for Long-term Service under High Temperature |
| CN107081537B (en) * | 2017-03-20 | 2019-08-16 | 武汉铁锚焊接材料股份有限公司 | A kind of engineering machinery High Speed Welding metal powder-cored wire and its welding method |
| CN107649798B (en) * | 2017-10-20 | 2020-08-18 | 西安理工大学 | Metal flux-cored wire for 25Cr2Ni4MoV steel and preparation method thereof |
| CN107717257B (en) * | 2017-11-27 | 2020-02-14 | 四川大西洋焊接材料股份有限公司 | Flux-cored wire matched with ultra-supercritical heat-resistant steel and preparation method thereof |
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