CN108723636B - Welding wire powder with low crack sensitivity, flux-cored wire, preparation and application - Google Patents
Welding wire powder with low crack sensitivity, flux-cored wire, preparation and application Download PDFInfo
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- CN108723636B CN108723636B CN201810385371.4A CN201810385371A CN108723636B CN 108723636 B CN108723636 B CN 108723636B CN 201810385371 A CN201810385371 A CN 201810385371A CN 108723636 B CN108723636 B CN 108723636B
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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
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
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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
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Abstract
The invention belongs to the technical field of welding materials, and particularly relates to welding wire powder with low crack sensitivity, a flux-cored wire, preparation and application. The welding wire powder provided by the invention comprises the following components in percentage by mass: 29-32% of chromium; 11-13% of nickel; 5-7.5% of manganese; 0.6-1% of ferromolybdenum; 2-3.5% of rare earth ferrosilicon; 2.5-4% of aluminum iron; 0.4-0.6% of magnesium powder; 20-23% of rutile; 1.5-2.5% of zircon sand; 1.5-3.5% of quartz; 1-2% of alumina; 3-4% of magnetite; 2-3% of magnesia; 3-4.5% of sodium potassium titanate; 1-1.5% of sodium fluoride; 1.5-2.5% of dehydrated potassium feldspar; 0.1-0.2% of bismuth oxide; 0.5-1% of rare earth fluoride and the like. The invention also provides a flux-cored wire containing the powder, which has extremely low hot crack sensitivity and excellent mechanical and corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of welding materials, and particularly relates to welding wire powder with low crack sensitivity, a flux-cored wire, preparation and application.
Background
The stainless steel flux-cored wire has the characteristics of excellent technological property, stable mechanical property, high production efficiency, low comprehensive cost and the like, and the proportion of the flux-cored wire in welding materials is continuously improved in recent years, so that the demand of the stainless steel flux-cored wire is continuously increased.
The E309LT1-1 stainless steel flux-cored wire is widely applied to welding of structural members and surfacing of corrosion-resistant layers in the fields of petrifaction, pressure vessels, shipbuilding, steel structures, engineering machinery and the like. The welding wire has the main technical problems that: the weld joint structure of the E309LT1-1 stainless steel flux-cored wire is mainly austenite, the hot crack sensitivity is high, welding can be carried out only by adopting low inter-channel temperature and low heat input in the welding process, otherwise, welding cracks occur, the progress of engineering construction is greatly restricted, and the popularization of other matched stainless steel flux-cored wires is influenced. This is because: when large-specification welding is adopted, the interval between the liquidus and the solidus is large when deposited metal is crystallized, a low-melting-point phase is easily formed at the later stage of crystallization often because impurities such as S, P and the like are not controlled in place or because the content of Si is too high and the like in a general E309LT1-1 stainless steel flux-cored wire, so that a low-melting-point liquid film is formed at the boundary of primary crystal grains, microcracks are formed by shrinkage during cooling, and the microcracks are expanded to the surface of a welding seam to form macroscopic cracks during cooling.
Relevant patents currently retrieved are: (1) a stainless steel flux-cored wire (publication No. CN 106736032A) for thin plate welding 309 (L). The welding wire provided by the patent is only suitable for welding thin plates, and the welding wire is not only suitable for welding thin plates, but also suitable for welding thick plates. (2) A stainless steel flux-cored wire capable of post-weld heat treatment (publication No. CN 105057916A). The composition and use of the wire proposed in this patent is different from the present invention. (3) A309 stainless steel flux-cored wire (publication number: CN 103480980A) with low six-row chromium emission. The alloy composition proposed in this patent is very different from the composition and use of the wire proposed in the present invention.
Disclosure of Invention
In order to overcome the disadvantages and drawbacks of the prior art, it is a primary object of the present invention to provide a welding wire powder with low crack sensitivity.
The flux-cored wire comprises the flux-cored wire powder with low crack sensitivity, is an E309LT1-1 stainless steel flux-cored wire with low crack sensitivity, has extremely low hot crack sensitivity, can be welded by adopting large heat input and high interchannel temperature, has excellent welding manufacturability and lower cost, is suitable for large-specification welding, has excellent mechanical property and corrosion resistance, and has larger market popularization prospect and better economic benefit.
The invention further aims to provide a preparation method of the flux-cored wire.
The fourth purpose of the invention is to provide the application of the welding wire powder and the flux-cored wire.
The purpose of the invention is realized by the following technical scheme:
a welding wire powder with low crack sensitivity comprises the following components in percentage by mass:
the granularity of the metal chromium is preferably 80 meshes, and the chemical components of the metal chromium are preferably more than or equal to 99.9 wt% of Cr, less than or equal to 0.020 wt% of C, less than or equal to 0.02 wt% of S and less than or equal to 0.010 wt% of P;
the granularity of the metal nickel is preferably 80 meshes, and the chemical components of the metal nickel are preferably more than or equal to 99.5 wt%, less than or equal to 0.050 wt%, less than or equal to 0.005 wt% of C, less than or equal to 0.005 wt% of S and less than or equal to 0.005 wt% of P;
the granularity of the metal manganese is preferably 80 meshes, and the chemical components of the metal manganese are preferably more than or equal to 99.88 wt%, less than or equal to 0.020 wt% of C, less than or equal to 0.02 wt% of S and less than or equal to 0.002 wt% of P;
the grain size of the ferromolybdenum is preferably 80 meshes, and the chemical components of the ferromolybdenum are preferably more than or equal to 55 wt% of Mo, less than or equal to 0.015 wt% of C, less than or equal to 0.10 wt% of S and less than or equal to 0.080 wt%;
the grain size of the rare earth ferrosilicon is preferably 80 meshes, and the chemical components of the rare earth ferrosilicon are preferably RE: 30-34 wt%, Si is more than or equal to 40.0 wt%, and Ce/RE is more than or equal to 46 wt%;
the granularity of the aluminum iron is preferably 80 meshes, and the chemical components of the aluminum iron are preferably more than or equal to 50 wt% of Al, less than or equal to 0.01 wt% of C, less than or equal to 0.040 wt% of S and less than or equal to 0.040 wt% of P;
the granularity of the magnesium powder is preferably 80 meshes, and the chemical components of the magnesium powder are preferably more than or equal to 97 wt% of Mg, less than or equal to 0.5 wt% of Fe, less than or equal to 0.1 wt% of Cu, less than or equal to 0.5 wt% of Si, and H2O≤0.2wt％；
The rutile has a particle size of 120 meshes, and the chemical component of the rutile is TiO2≥90wt％，C≤0.060wt％，S≤0.030wt％，P≤0.040wt％；
The zircon sand preferably has a particle size of 80 meshes and a chemical component of ZrO2≥60.0wt％，SiO2≤34wt％，S≤0.050wt％，P≤0.020wt％；
The granularity of the quartz is preferably 60-200 meshes, and the chemical component of the quartz is preferably SiO2≥97wt％，S≤0.040wt％，P≤0.040wt％；
The granularity of the alumina is preferably 60-200 meshes, and the chemical component of the alumina is preferably Al2O3≥98wt％，S≤0.035wt％，P≤0.035wt％；
The magnetite preferably has a particle size of 80 mesh and a chemical composition of Fe3O4≥92wt％，S≤0.050wt％，P≤0.050wt％；
The granularity of the magnesite is preferably 60-200 meshes, and the chemical components of the magnesite are preferably more than or equal to 98 wt% of MgO, less than or equal to 0.45 wt% of Si, less than or equal to 0.050 wt% of S and less than or equal to 0.050 wt%;
the chemical composition of the sodium potassium titanate is preferably TiO2≥60wt％，K2O≥28wt％，S≤0.050wt％，P≤0.050wt％；
The chemical composition of the sodium fluoride is preferably that NaF is more than or equal to 94 wt%;
the chemical composition of the dehydrated potassium feldspar is preferably K2O+Na2O≥12wt％，K2O≥8wt％，SiO2：63～73wt％，Al2O3：15～24wt％，S≤0.040wt％，P≤0.040wt％；
The chemical composition of the bismuth oxide is preferably Bi2O3≥98wt％；
The chemical components of the rare earth fluoride are preferably equal to or more than 83 wt% of REO and CeO2/REO≥45wt％，F≥26wt％；
The granularity of the iron powder is preferably 80 meshes, and the chemical components of the iron powder are preferably more than or equal to 98 wt% of Fe, less than or equal to 0.050 wt% of C, less than or equal to 0.020 wt% of S and less than or equal to 0.020 wt% of P;
a flux-cored wire, which comprises the flux-cored wire powder with low crack sensitivity;
the flux-cored wire also comprises a sheath;
the outer skin is preferably a stainless steel band;
the preparation method of the flux-cored wire comprises the following steps:
(1) uniformly mixing all components of the welding wire powder with low crack sensitivity to obtain the welding wire powder with low crack sensitivity;
(2) wrapping a stainless steel strip with welding wire powder with low crack sensitivity, and rolling and reducing to obtain a flux-cored wire;
coating the stainless steel strip with the medicinal powder, and rolling and reducing to obtain a flux-cored wire;
the stainless steel strip is preferably a 304L stainless steel strip;
the filling rate of the medicinal powder is 23-28 wt%;
the diameter of the stainless steel flux-cored wire is preferably 1.2 mm;
the welding wire powder with low crack sensitivity and the flux-cored wire are applied to the field of welding;
the patent mainly adopts the following approaches to reduce the hot crack sensitivity of the flux-cored wire:
(1) the content of S, P and other impurities in the deposited metal is strictly controlled. S, P are limited to a strict condition because they tend to form a low melting point phase in the deposited metal, segregate at coarse austenite boundaries to form a liquid film, and easily cause thermal cracking due to shrinkage stress during solidification. S is controlled to be less than 0.015 wt%, and P is controlled to be less than 0.020 wt%.
(2) The addition of certain rare earth elements in the powder can reduce the content of S, P and other impurities in deposited metal, improve the purity of the deposited metal and reduce the sensitivity of thermal cracking.
(3) The composition of the deposited metal is controlled so that the solidification structure has 8FN to 13FN ferrite, thereby reducing the segregation of low-melting-point elements such as S, P on the austenite boundary and greatly improving the crack resistance.
(4) Controlling the content of the Si deposited metal. Silicon in the deposited metal is mainly derived from quartz, aluminosilicate, and the like, and too high Si content in the deposited metal causes segregation of low melting point substances, increasing the sensitivity of thermal cracking. The silicon content of deposited metal should be controlled below 0.65 wt%, and the total SiO in the corresponding powder2The content is less than 10 wt%.
The welding wire powder provided by the invention mainly has the following components:
metallic chromium: the addition amount of the transition chromium element in the weld metal is 29-32 wt%.
Metal nickel: the addition amount of the transition nickel element in the weld metal is 11-13 wt%.
Metal manganese: on one hand, the strength is improved for transition manganese elements in weld metal, and on the other hand, the weld metal is deoxidized and desulfurized. Too low manganese content can reduce the metal strength of the welding seam, and too high manganese oxide is generated to increase the surface tension and influence the spreading of the welding seam. Therefore, the addition amount of the metal manganese is 5-7.5 wt%.
Ferromolybdenum: molybdenum element is transited into weld metal to enhance the corrosion resistance, and the adding amount of the molybdenum element is 0.6-1 wt%.
Rare earth silicon iron: on one hand, the silicon and the manganese are jointly deoxidized, and the proper Mn/Si can well fix oxygen elements in the welding seam, generate oxide particles to enter slag, and purify welding seam metal; and the other side is siliconized in the weld metal, so that the corrosion resistance of the stainless steel is improved. The rare earth element can be combined with low melting point substances such as S, the segregation of the low melting point substances is reduced when the deposited metal is solidified, and the thermal cracking tendency is reduced. The range of adding the rare earth ferrosilicon is 2-3.5 wt%.
Aluminum iron: on one hand, the deoxidation is assisted, and on the other hand, the viscosity and the melting point of the molten slag are adjusted by matching with corundum, and the range of adding aluminum iron is 2.5-4 wt%.
Magnesium powder: the strong deoxidizer purifies weld metal and improves slag removal, the powder loose packing ratio can be reduced when the deoxidizer is too high, and the content of the added magnesium powder is 0.4-0.6 wt%.
Rutile: the main function is slagging, which determines the fluidity of the slag. The addition amount is too small, so that the slag coverage is not complete; the addition amount is 20-23 wt%, the slag is more, the corrugation is thick, the slag is not easy to remove, and the forming is not attractive.
Zircon sand, quartz, alumina: and the melting point and viscosity of the molten slag are adjusted while slagging. The adding amount of quartz is too small, and incomplete slag coverage is easy to occur. The quartz is added in too much amount, the welding line is not well spread, the residual height is large, and the slag is easy to adhere. The addition amounts of the zircon sand, the quartz and the alumina are respectively controlled to be 1.5-2.5 wt% of the zircon sand, 1.5-3.5 wt% of the quartz and 1-2 wt% of the alumina.
Magnetite: and adjusting the alkalinity and viscosity of the molten slag to improve the spreading of the welding seam, wherein the range of adding magnetite is 3-4 wt%.
Sodium potassium titanate: stabilizing electric arc and improving spreading, wherein the range of adding the sodium potassium titanate is 3-4.5 wt%.
Sodium fluoride: it acts to reduce surface tension and improve spreading, but too much addition increases spatter. The addition amount of the sodium fluoride is controlled to be 1-1.5 wt%.
Dehydrated potassium feldspar: on the one hand, Na in feldspar2O and K2O can improve the stability of the electric arc and play a role in stabilizing the electric arc, and on the other hand, SiO in feldspar2And Al2O3The slag removal can be improved by replacing a part of quartz and alumina, and the all-position welding is facilitated. However, too high an amount of the addition makes the slag sticky and affects spreading. The addition amount of the dehydrated potassium feldspar is controlled to be 1.5-2.5 wt%.
Bismuth oxide: the surface active substance improves the slag detachability, but excessive amount can form low-melting-point inclusion and deteriorate the quality of welding seams, and the adding amount is controlled to be 0.1-0.2 wt% of bismuth oxide.
Rare earth fluoride: the main function soil can be combined with low melting point materials such as S, the segregation of the low melting point materials is reduced when the deposited metal is solidified, and the hot crack tendency is reduced. Fluorine can reduce the hydrogen content in the deposited metal and reduce the porosity sensitivity. The method is used for adjusting the crack resistance of the welding line, and the addition amount is 0.5-1 wt%.
Iron powder: the main function is to adjust the loose packing ratio of the medicinal powder so as to keep the proper filling rate of the medicinal powder. An excessive amount of iron powder added may generate a large amount of fumes.
Compared with the prior art, the invention has the following advantages and effects:
(1) the flux-cored wire provided by the invention is suitable for large-range welding: the welding current is 160A-240A, and the welding voltage is 28-35V.
(2) The flux-cored wire deposited metal provided by the invention has stable mechanical property, proper strength (room temperature tensile strength: 520-550 MPa) and elongation rate not less than 35%.
(3) The flux-cored wire provided by the invention has stable welding arc and small splashing; the spreadability and the fusion property are good, and the welding seam is attractive in appearance; easy slag removal.
(4) The flux-cored wire provided by the invention is suitable for welding structural members and surfacing of corrosion-resistant layers in the fields of petrifaction, pressure vessels, shipbuilding, steel structures, engineering machinery and the like, and is suitable for welding thin plates and thick plates.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
A welding wire powder with low crack sensitivity comprises the following components in percentage by mass:
a flux-cored wire comprises the above flux-cored wire powder with low crack sensitivity and a sheath (stainless steel band);
the preparation method of the flux-cored wire comprises the following steps:
(1) uniformly mixing all components of the welding wire powder with low crack sensitivity to obtain the welding wire powder with low crack sensitivity;
(2) and (3) wrapping the stainless steel strip with the welding wire powder with low crack sensitivity, and rolling and reducing to obtain the flux-cored wire, wherein the filling rate of the powder is 28 wt%, and the diameter of the flux-cored wire is 1.2 mm.
Example 2
A welding wire powder with low crack sensitivity comprises the following components in percentage by mass:
a flux-cored wire comprises the above flux-cored wire powder with low crack sensitivity and a sheath (stainless steel band);
the preparation method of the flux-cored wire comprises the following steps:
(1) uniformly mixing all components of the welding wire powder with low crack sensitivity to obtain the welding wire powder with low crack sensitivity;
(2) and (3) wrapping the stainless steel strip with the welding wire powder with low crack sensitivity, and rolling and reducing to obtain the flux-cored wire, wherein the filling rate of the powder is 25.5 wt%, and the diameter of the flux-cored wire is 1.2 mm.
Example 3
A welding wire powder with low crack sensitivity comprises the following components in percentage by mass:
a flux-cored wire comprises the above flux-cored wire powder with low crack sensitivity and a sheath (stainless steel band);
the preparation method of the flux-cored wire comprises the following steps:
(1) uniformly mixing all components of the welding wire powder with low crack sensitivity to obtain the welding wire powder with low crack sensitivity;
(2) and (3) wrapping the stainless steel strip with the welding wire powder with low crack sensitivity, and rolling and reducing to obtain the flux-cored wire, wherein the filling rate of the powder is 23 wt%, and the diameter of the flux-cored wire is 1.2 mm.
Comparative example 1
The welding wire powder comprises the following components in percentage by mass:
a flux-cored wire comprises the above flux powder and a sheath (stainless steel band);
the preparation method of the flux-cored wire is the same as that of the embodiment 2, wherein the filling rate of the powder is 25.5 wt%, and the diameter of the flux-cored wire is 1.2 mm.
Comparative example 2
The welding wire powder comprises the following components in percentage by mass:
a flux-cored wire comprises the above flux powder and a sheath (stainless steel band);
the preparation method of the flux-cored wire is the same as that of the embodiment 2, wherein the filling rate of the powder is 25.5 wt%, and the diameter of the flux-cored wire is 1.2 mm.
Comparative example 3
The welding wire powder comprises the following components in percentage by mass:
a flux-cored wire comprises the above flux powder and a sheath (stainless steel band);
the preparation method of the flux-cored wire is the same as that of the embodiment 2, wherein the filling rate of the powder is 25.5 wt%, and the diameter of the flux-cored wire is 1.2 mm.
Effects of the embodiment
The chemical composition requirements of each component of the welding wire powder prepared in examples 1 to 3 and comparative examples 1 to 3 are shown in table 1.
TABLE 1 chemical composition requirements of the main raw materials
The flux-cored wires prepared in the embodiments 1 to 3 are welded according to the following specifications: the protective gas adopts 100% CO2And connecting a direct-current reverse connection type power supply to perform welding operation, wherein the welding current is 160-240A, the welding voltage is 28-35V, the welding speed is 25-35 cm/min, and the preheating and inter-road temperature is 150 ℃. The welding deposited metal performance is detected according to the Chinese national standard GB/T17853-1999 stainless steel flux-cored wire, and the chemical components and the mechanical properties are shown in tables 2 and 3.
Table 2 examples 1 to 3 were conducted to deposit metal chemical components (wt%) in flux-cored wire
| Item | C | Cr | Ni | Mo | Mn | Si | P | S |
| Example 1 | 0.039 | 23.04 | 12.45 | 0.097 | 1.65 | 0.59 | 0.0073 | 0.019 |
| Example 2 | 0.037 | 23.52 | 12.84 | 0.109 | 1.52 | 0.60 | 0.0079 | 0.017 |
| Example 3 | 0.034 | 24.07 | 13.02 | 0.123 | 1.47 | 0.64 | 0.0066 | 0.019 |
TABLE 3 mechanical Properties of deposited metals of flux-cored wires prepared in examples 1 to 3
| Item | Rm/MPa | A/％ |
| Required value | ≥520 | ≥25 |
| Example 1 | 523 | 36.5 |
| Example 2 | 529 | 36 |
| Example 3 | 542 | 40 |
According to the requirements of the bending test method of the welding joint of GB/T2653-2008 of the Chinese national standard and the intergranular corrosion test method of the corrosion stainless steel of GB/T4334-200 metal and alloy, samples for lateral bending and intergranular corrosion are prepared, and the lateral bending test and the intergranular corrosion test are carried out, wherein the detection results meet the requirements, as shown in Table 4, 2 samples are prepared in each embodiment.
TABLE 4 lateral bending and intergranular corrosion performance of flux-cored wires prepared in examples 1 to 3
In the three embodiments, test plates are welded at currents of 160A, 200A and 240A respectively, and no crack is found by performing ray and ultrasonic flaw detection according to the requirements of energy industry standards NBT 47013.2-2015 and NBT47013.3-2015 of the people's republic of China, which indicates that the crack sensitivity is low.
Ferrite was used to measure the ferrite content of each example as shown in table 5.
TABLE 5 ferrite content (FN) of flux-cored wire obtained in examples 1 to 3
| Serial number | Example 1 | Example 2 | Example 3 |
| Ferrite content | 9.0 | 10.3 | 11.2 |
In comparative example 1, the rare-earth ferrosilicon was replaced with 45# ferrosilicon, and rare-earth fluoride was removed, that is, after removing rare-earth elements, when the welding current was increased to 220A, ultrasonic and radiographic inspection was carried out, and it was found that cracks were present. Comparative example 2 with magnetite removed, the weld narrowed and wetting angle decreased, making spreading worse. Comparative example 3 SiO in dehydrated Potassium feldspar2、Al2O3、K2O、Na2And O is respectively replaced by quartz, alumina, potassium titanate and soda ash with the same quantity, and the welding seam surface is easy to stick slag and rough and unsmooth.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The welding wire powder with low crack sensitivity is characterized by comprising the following components in percentage by mass:
2. the welding wire powder with low crack sensitivity as claimed in claim 1, wherein:
the grain size of the ferromolybdenum is 80 meshes, and the ferromolybdenum has the chemical components of more than or equal to 55 wt% of Mo, less than or equal to 0.015 wt% of C, less than or equal to 0.10 wt% of S and less than or equal to 0.080 wt%.
3. The welding wire powder with low crack sensitivity as claimed in claim 1, wherein:
the granularity of rare earth ferrosilicon is 80 meshes, and the chemical components are RE: 30-34 wt%, Si is more than or equal to 40.0 wt%, and Ce/RE is more than or equal to 46 wt%.
4. The welding wire powder with low crack sensitivity as claimed in claim 1, wherein:
the granularity of the aluminum iron is 80 meshes, and the chemical components of the aluminum iron are more than or equal to 50 wt% of Al, less than or equal to 0.01 wt% of C, less than or equal to 0.040 wt% of S and less than or equal to 0.040 wt% of P.
5. The welding wire powder with low crack sensitivity as claimed in claim 1, wherein:
the magnetite has a particle size of 80 meshes and a chemical component of Fe3O4≥92wt％，S≤0.050wt％，P≤0.050wt％。
6. The welding wire powder with low crack sensitivity as claimed in claim 1, wherein:
the chemical component of the dehydrated potassium feldspar is K2O+Na2O≥12wt％，K2O≥8wt％，SiO2：63～73wt％，Al2O3：15～24wt％，S≤0.040wt％，P≤0.040wt％。
7. The welding wire powder with low crack sensitivity as claimed in claim 1, wherein:
the chemical components of the rare earth fluoride comprise more than or equal to 83wt percent of REO and CeO2/REO≥45wt％，F≥26wt％。
8. A flux-cored wire characterized by comprising the flux for a welding wire having low crack sensitivity according to any one of claims 1 to 7.
9. The method of manufacturing a flux-cored welding wire of claim 8, comprising the steps of:
(1) uniformly mixing the components of the welding wire powder with low crack sensitivity of any one of claims 1 to 7 to obtain the welding wire powder with low crack sensitivity;
(2) and (3) wrapping the stainless steel strip with the welding wire powder with low crack sensitivity, and rolling and reducing to obtain the flux-cored wire.
10. The welding wire powder with low crack sensitivity as defined in any one of claims 1 to 7 and the flux-cored welding wire as defined in claim 8 are applied to the field of welding.
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| CN111745325B (en) * | 2020-06-30 | 2022-04-22 | 武汉铁锚焊接材料股份有限公司 | Self-protection flux-cored wire for X70 pipeline steel |
| CN113441871B (en) * | 2021-06-01 | 2022-12-20 | 天津三英焊业股份有限公司 | Flux-cored wire suitable for laser-electric arc hybrid welding |
| CN114083178B (en) * | 2021-11-30 | 2023-04-07 | 山东聚力焊接材料有限公司 | Spray welding wire and manufacturing method thereof |
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| CN107127471A (en) * | 2017-03-22 | 2017-09-05 | 武汉铁锚焊接材料股份有限公司 | A kind of low-alloy chrome molybdenum heat resisting steel flux-cored wire and its application |
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| JPS58116990A (en) * | 1981-12-28 | 1983-07-12 | Kawasaki Steel Corp | Flux for submerged arc welding |
| CN104028913A (en) * | 2014-05-30 | 2014-09-10 | 洛阳双瑞特种合金材料有限公司 | Seamless self-protection flux-cored wire |
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|---|---|
| CN108723636A (en) | 2018-11-02 |
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